Updated on 2024/10/16

Information

 

写真a

 
TSUBAKI SHUNTARO
 
Organization
Faculty of Agriculture Department of Bioscience and Biotechnology Associate Professor
International Institute for Carbon-Neutral Energy Research (Concurrent)
Research Center for Synchrotron Light Applications (Concurrent)
Kyushu University Platform of Inter/Transdisciplinary Energy Research (Concurrent)
School of Agriculture Department of Bioresource and Bioenvironment(Concurrent)
Graduate School of Bioresource and Bioenvironmental Sciences Department of Bioscience and Biotechnology(Concurrent)
Title
Associate Professor
Profile
<Research Activities> Catalytic conversion of carbohydrates, extraction of functional molecules, and freeze-drying acceleration technology using precisely controlled microwave heating Elucidation of the mechanism of microwave-induced reaction acceleration by "in-situ" observation using XAFS and Raman spectroscopy. Development of new microwave chemical processes based on microwave chemistry theory <Educational Activities Lectures of "Laboratory Work of Food Manufacturing Machinery," "Laboratory Course of Physical Chemistry," "Unit Operations," and "Food Technology and Machinery". Teaching knowledge and experimental methods related to chemical engineering and machinery required for food production.

Degree

  • Dr. (Agriculture)

Research History

  • 2021年4月 - 2021年12月 大阪大学大学院工学研究科応用化学専攻 特任講師 2019年10月 -現在 国立研究開発法人科学技術振興機構 さきがけ研究者「電子やイオン等の能動的制御と反応」領域 2016年4月 - 2021年3月 東京工業大学 物質理工学院応用化学系 助教 2015年4月 - 2016年3月 東京工業大学 大学院理工学研究科応用化学専攻 助教 2011年4月 - 2015年3月 高知大学 教育研究部 総合科学系 複合領域科学部門 特任助教   

Research Interests・Research Keywords

  • Research theme: Development of microwave food processing technology Development of microwave chemical processes

    Keyword: microwave, solid catalyst, food process engineering

    Research period: 2022.1 - 2022.5

Awards

  • 2020年度日本エネルギー学会進歩賞(学術部門)

    2020.11   日本エネルギー学会   マイクロ波を用いた高効率バイオマス変換プロセスの開発

  • 第 8 回新化学技術研究奨励賞

    2019.6   JACI 新化学技術推進協会   位相制御マイクロ波による有機性廃棄物の高効率ガス化

  • 物質理工学院研究奨励賞

    2019.1   東京工業大学   マイクロ波を用いたバイオマスの急速熱分解法の開発

  • 物質理工学院 東工大工系教育賞

    2019.1   東京工業大学   応用化学系の実験科目における教育の質向上への貢献

  • 第1回日本電磁波エネルギー応用学会JEMEA進歩賞

    2015.11   日本電磁波エネルギー応用学会  

  • JEMEA ベストポスター賞

    2013.9   日本電磁波エネルギー応用学会  

  • 第 24 回研究発表会研究発表賞(口頭発表)

    2012.9   日本木材学会中国・四国支部  

  • 第 62 回日本木材学会大会優秀ポスター賞

    2012.3   日本木材学会  

  • The Best Oral Presentation

    2011.12   HPI-APA International Conference on Innovation in Polymer Science and Technology  

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Papers

  • Microwave-enhanced catalytic conversion of fatty acid ester to olefins by Na-ZSM-5 Reviewed

    Ota, S; Fukushima, J; Kimijima, K; Kimura, M; Igura, N; Tezuka, N; Sato, T; Einaga, H; Tsubaki, S

    CHEMICAL ENGINEERING JOURNAL   497   2024.10   ISSN:1385-8947 eISSN:1873-3212

  • Determining the influence of microwave-induced thermal unevenness on vanadium oxide catalyst particles Reviewed International journal

    Tsubaki, Shuntaro; Matsuzawa, Tomoki; Higuchi, Tomoki; Fujii, Satoshi; Wada, Yuji

    Chemical Engineering Journal   433 ( 2 )   2022.4

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    DOI: 10.1016/j.cej.2021.133603

  • Probing the temperature of supported platinum nanoparticles under microwave irradiation by in situ and operando XAFS

    Taishi Ano, Shuntaro Tsubaki, Anyue Liu, Masayuki Matsuhisa, Satoshi Fujii, Ken Motokura, Wang Jae Chun, Yuji Wada

    Communications Chemistry   3 ( 1 )   2020.12

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    © 2020, The Author(s). Microwave irradiation can cause high local temperatures at supported metal nanoparticles, which can enhance reaction rates. Here we discuss the temperature of platinum nanoparticles on γ-Al2O3 and SiO2 supports under microwave irradiation using the Debye–Waller factor obtained from in situ extended X-ray absorption fine structure (EXAFS) measurements. Microwave irradiation exhibits considerably smaller Deby–Waller factors than conventional heating, indicating the high local temperature at the nanoparticles. The difference in the average temperatures between the platinum nanoparticles and the bulk under microwaves reaches 26 K and 132 K for Pt/Al2O3 and Pt/SiO2, respectively. As a result, Pt/SiO2 exhibits considerably more reaction acceleration for the catalytic dehydrogenation of 2-propanol under microwave irradiation than Pt/Al2O3. We also find microwaves enhance the reduction of PtOx nanoparticles by using operando X-ray absorption near edge structure (XANES) spectroscopy. The present results indicate that significant local heating of platinum nanoparticles by microwaves is effective for the acceleration of catalytic reactions.

    DOI: 10.1038/s42004-020-0333-y

  • Insights into the Dielectric-Heating-Enhanced Regeneration of CO2-Rich Aqueous Amine Solutions

    Shuntaro Tsubaki, Kosuke Furusawa, Hidetaka Yamada, Tsuguhiro Kato, Takayuki Higashii, Satoshi Fujii, Yuji Wada

    ACS Sustainable Chemistry and Engineering   8 ( 36 )   13593 - 13599   2020.9

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    Copyright © 2020 American Chemical Society. Microwaves (MW) and radio frequency (RF) dielectric heating were used to facilitate the regeneration of CO2-rich amine solutions, and the mechanism of the rate enhancement by dielectric heating was discussed. Dielectric measurements of aqueous solutions of monoethanolamine (primary amine), 2-(ethylamino)ethanol (secondary amine), and N-methyl diethanolamine (tertiary amine) revealed that the formation of carbamate and bicarbonate ions by CO2 absorption improves the dielectric loss tangent. Dielectric heating by MWs (2.45 GHz, 915 MHz) and RF (200 MHz) was compared to facilitate regeneration of the CO2-rich amine solution at a constant power of 40 W. The CO2 release rate was the highest at 2.45 GHz in all aqueous amine solutions, which was 1.47 to 1.74 times that of conventional heating by an oil bath operated at 120 °C. However, the CO2 release rate decreased as the frequency decreased to 915 and 200 MHz. Electromagnetic field simulation suggested that CO2 release was enhanced owing to the generation of a more intense electric field at 2.45 GHz than at lower frequencies.

    DOI: 10.1021/acssuschemeng.0c05342

  • Ultra-fast pyrolysis of lignocellulose using highly tuned microwaves: synergistic effect of a cylindrical cavity resonator and a frequency-auto-tracking solid-state microwave generator Reviewed International journal

    Tsubaki, Shuntaro; Nakasako, Yuki; Ohara, Noriko; Nishioka, Masateru; Fujii, Satoshi; Wada, Yuji

    GREEN CHEMISTRY   22 ( 2 )   342 - 351   2020.1

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    DOI: 10.1039/c9gc02745a

  • Radio frequency alternating electromagnetic field enhanced tetraruthenium polyoxometalate electrocatalytic water oxidation Reviewed International journal

    S. Tsubaki, S. Hayakawa, S. Ueda, S. Fujii, E. Suzuki, J. Zhang, A. Bond, Y. Wada

    Chemical Communications   55 ( 8 )   1032 - 1035   2019.1

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    Radio frequency alternating electromagnetic field enhanced tetraruthenium polyoxometalate electrocatalytic water oxidation

  • Process intensification of the ultra-rapid pyrolysis of bamboo by spatially separated microwave electric and magnetic fields

    Shuntaro Tsubaki, Jun Fukushima, Aritomo Yamaguchi, Masateru Nishioka, Yuji Wada

    Chemical Engineering Journal   499   2024.11   ISSN:1385-8947

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    This study demonstrates the efficient microwave “ultra-rapid” pyrolysis of bamboo using a spatially separated electric- (E-) and magnetic (H-) field and microwave reactor equipped with a semiconductor generator. The microwave E-field promoted the gasification and carbonization of the bamboo within 30 s. Extensive formation of gases (mainly H2 and CO) and tar (fragments of guaiacyl and syringyl lignin) was achieved by E-field heating. However, microwave reflection became prominent after extensive carbonization of the bamboo under a microwave E-field. The carbonized bamboo was more effectively heated in the H-field, which was effective in preventing microwave reflection and yielding biochar with more defects and an amorphous structure than the electric furnace. We also achieved process intensification by employing a higher quality–factor (Q-factor) cavity resonator (915 MHz). The continuous-flow H-field microwave heating reactor effectively improved the carbon content of the pyrolyzed biomass. A synergistic use of microwave E- and H- fields enables the intensification of microwave “ultra-rapid” pyrolysis of lignocellulosic biomass.

    DOI: 10.1016/j.cej.2024.156260

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  • Accelerating Sulfated Polysaccharides Extraction from Fast-Growing Ulva Green Seaweed by Frequency-Controlled Microwaves

    Kazuma Matsuzaki, Daisuke Tatsumi, Takeharu Sugiyama, Masanori Hiraoka, Noriyuki Igura, Shuntaro Tsubaki

    ACS Omega   9 ( 27 )   29896 - 29903   2024.6   ISSN:2470-1343 eISSN:2470-1343

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    Ulva sp. is a type of green algae and is widely distributed in coastal areas around the world due to eutrophication. Effective utilization of Ulva sp. is expected for the establishment of carbon-neutral biochemical production. Microwave-assisted hydrothermal extraction is one of the most efficient ways of extracting highly functional polysaccharides called ulvan. Here, we demonstrate the importance of microwave frequency in enhancing ulvan extraction from Ulva meridionalis. We found that microwaves (2.45 GHz) selectively heat water solvent, while radio frequency (200 MHz) selectively heats ionic ulvan. Moreover, 2.45 GHz was more effective for extracting ulvan than 200 MHz. Then, we analyzed the conformational change in ulvan during microwave irradiation using in situ small-angle X-ray scattering. Microwaves initiated the loosening of ulvan bundles at temperatures lower than those of conventional heating. As a result, microwaves at 2.45 GHz selectively heat water and initiate ulvan structural change to enhance the extraction of ulvan from U. meridionalis.

    DOI: 10.1021/acsomega.4c04080

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  • Biomass Valorization by Microwave Heating

    TSUBAKI Shuntaro

    Journal of the Japan Society of Colour Material   97 ( 6 )   171 - 175   2024.6   ISSN:0010180X eISSN:18832199

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    <p>Microwave heating is one of the key technologies for new chemical processes that effectively utilizes the renewable energy. Microwaves are capable of highly efficient heating due to direct heating of materials; thus, efficient biomass conversion can be achieved. Microwave is also expected as a tool to control chemical reactions, because microwaves heat the materials in a non-contact mode and induce chemical reactions. This paper introduces examples of biomass conversion processes, such as extraction using hydrothermal reactions, catalytic hydrolysis reactions, and rapid pyrolysis reactions of lignocellulose, that exploit the unique heating behavior of microwaves.</p>

    DOI: 10.4011/shikizai.97.171

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  • Self-Sufficient Production of Lunar Regolith Gravels on the Moon by Ultrarapid Microwave Sintering Reviewed

    Shuntaro Tsubaki, Satoshi Fujii, Masahiro Yamamoto, Hiroshi Kanamori, Takeshi Hoshino, Satoshi Hosoda, Yuji Wada

    ACS Omega   9 ( 20 )   22488 - 22494   2024.5   ISSN:2470-1343

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    A sintered lunar regolith is expected to be used to construct buildings, roads, and landing pads for spacecrafts on the Moon. Here, we demonstrate that focused microwave heating is effective for the rapid solidification of the lunar regolith simulant to obtain regolith gravel without any microwave susceptor. The conventional multimode microwave oven cannot heat lunar regolith simulants and requires microwave susceptors such as silicon carbide (SiC) and thermal insulators because of its low dielectric loss. We achieved rapid microwave heating of a lunar regolith simulant without using a susceptor or thermal insulator by forming an intense microwave electric field using a cavity resonator and a semiconductor microwave oscillator. Focused microwaves at 2.45 GHz produced the gravel-shaped and solidified lunar regolith at 300 °C lower temperature than a conventional electrical furnace, where more than 1050 °C temperature was required to sinter the lunar regolith simulant. In addition, we produced larger gravel of the lunar regolith simulant using 915 MHz. The intense electric field generated by the single-mode resonator promoted the solidification of the lunar regolith simulant without any additional substances. This process enables the local production of structured lunar regoliths on the Moon without the transport of any materials from the Earth.

    DOI: 10.1021/acsomega.4c02702

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  • The 6<sup>th</sup> JEMEA Young Working Group Report

    Tsubaki Shuntaro

    JEMEA Bulletin   9 ( 1 )   25 - 26   2024   eISSN:24341495

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    2023年8/31(木)-9/1(金)の日程で、福岡国際会議場および九州大学伊都キャンパスにおいて、「第6回JEMEA若手サマースクール~マイクロ波化学入門セミナー」が開催された。九州地方を中心に、マイクロ波化学の基礎について、網羅的にダイジェストする企画であり、特に若手向けのマイクロ波基礎講座を志向して企画された。

    DOI: 10.32304/jemeabulletin.9.1_25

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  • In Situ Formation of Ru–Sn Bimetallic Particles for Non-Oxidative Coupling of Methane

    Ken Motokura, Ayaka Mizuno, Shingo Hasegawa, Masayuki Nambo, Moe Takabatake, Kenta Suzuki, Yuichi Manaka, Yohei Uemura, Shuntaro Tsubaki, Wang-Jae Chun

    The Journal of Physical Chemistry C   127 ( 31 )   15185 - 15194   2023.7

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    DOI: 10.1021/acs.jpcc.3c03078

  • Production and Utilization of "Ulvan" from Ulva meridionalis

    Tsubaki Shuntaro, Matsuzaki Kazuma, Igura Noriyuki, Hiraoka Masanori

    Foods & Food Ingredients Journal of Japan   228 ( 2 )   155 - 161   2023.4   ISSN:09199772 eISSN:24365998

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    Language:Japanese   Publisher:Editorial Board of Foods & Food Ingredients Journal of Japan  

    Algal biomass, called blue carbon, is attracting attention as biomass that is capable of fixing CO<sub>2</sub> rapidly. Fast-growing green algae such as Ulva meridionalis are expected to be used for CO<sub>2</sub> fixation and for bioremediation of eutrophic sea areas. U. meridionalis rapidly assimilates CO<sub>2</sub> as a sulfated polysaccharide called "ulvan". Microwave-assisted extraction processes can achieve efficient extraction of ulvan. Furthermore, ulvan can be efficiently converted to monosaccharides by using microwave heating and polyoxometalates as an environmentally benign superacid catalyst. The sulfated structure of ulvan was effective both for collection of microwave energy and for efficient extraction and conversion of ulvan by microwaves. Rapid CO<sub>2</sub> fixation by U. meridionalis and effective utilization of ulvan by microwaves represents a new carbon-neutral chemical process based on algal biomass.

    DOI: 10.34457/ffij.228.2_155

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  • International conference report of 4GCMEA2022

    Tsubaki Shuntaro

    JEMEA Bulletin   8 ( 1 )   14 - 14   2023   eISSN:24341495

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    Language:Japanese   Publisher:Japan Society of Electromagnetic Wave Energy Applications  

    The 4th Global Congress on Microwave Energy Applications (4GCMEA) 2022が、中国 四川大学 Kama Huang先生が実行委員長となり、2022年8月17日~20日にオンラインで開催された。本会議はChina Association of Microwave Power Application (CAMPA) が母体となって、2020年に成都で開催される予定であったが、コロナ渦において2年の開催延長ののち、完全オンラインでの開催となった。

    DOI: 10.32304/jemeabulletin.8.1_14

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  • Controlling the Catalytic Reaction by Microwaves

    TSUBAKI Shuntaro

    KAGAKU TO SEIBUTSU   60 ( 6 )   272 - 277   2022.6   ISSN:0453073X eISSN:18836852

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    Language:Japanese   Publisher:Japan Society for Bioscience, Biotechnology, and Agrochemistry  

    <p>マイクロ波照射により,物質高選択的に熱的非平衡反応場を形成し,化学反応を促進することができる.本稿では,マイクロ波が触媒反応を加速する機構の解明と,環境に調和した新化学プロセスへの応用研究について紹介する.</p>

    DOI: 10.1271/kagakutoseibutsu.60.272

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  • Interlayer-expanded MWW-type zeolite catalysts with carbon filler in expanded micropores for efficient microwave heating Reviewed International journal

    Masaki Okamoto, Takahiro Sakatsume, @Shuntaro Tsubaki, Yuji Wada

    Journal of Materials Chemistry A   10   14585 - 14593   2022.6

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    DOI: 10.1039/D2TA01602H

  • Microwave Boosting of Interfacial Tunneling Electron Transfer in a Quantum Dot-Sensitized Photoelectrode Reviewed International journal

    Matsuhisa, Masayuki; Kishimoto, Fuminao; Furusawa, Kosuke; Tsubaki, Shuntaro; Wada, Yuji

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   95 ( 2 )   288 - 295   2022.2

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    DOI: 10.1246/bcsj.20210401

  • Designing Local Microwave Heating of Metal Nanoparticles/Metal Oxide Substrate Composites Reviewed International journal

    Taishi Ano, Shuntaro Tsubaki, Satoshi Fujii, Yuji Wada

    Journal of Physical Chemistry C   125 ( 43 )   23720 - 23728   2021.11

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    Microwave (MW) heating promotes various reactions catalyzed by supported metal nanoparticles (NPs); the mechanism is based on selectively heating the NPs, thereby inducing hot spots at the active reaction sites. Here, we demonstrate the effects of the sizes and loadings of platinum (Pt) NPs supported on single-crystal metal oxide (MOx) substrates (Al2O3, MgAl2O4, TiO2, SrTiO3) having different relative permittivities and conductivities. Considerable heating occurred when Pt NPs were deposited on MOxsubstrates having low relative permittivities and conductivities, indicating that the MW transparency of the substrate is the most critical parameter. Magnetic field heating was preferred when the loading amount of Pt NPs was large. Electromagnetic field simulations suggested that the electric field concentration between Pt NPs formed local hot spots. Moreover, the MW absorption behavior of the NP/MOxcomposite depended on the conductivity of the supported metal, and the frequency of the MWs. We conclude that the relative permittivity and conductivity of the MOxsupport are the most important parameters for ensuring efficacious MW heating by Pt NPs, followed by size and loading of the supported metal NPs. The synergistic effect of the metal NPs and MOxsupport results in targeted MW heating of the supported metal catalyst.

    DOI: 10.1021/acs.jpcc.1c06650

  • Controlling the Schottky Barrier at the Pt/TiO#D2#DInterface by Intercalation of a Self-Assembled Monolayer with Oriented Dipole Moments Reviewed International journal

    Taishi Ano, Fuminao Kishimoto, Shuntaro Tsubaki, Yi Hsien Lu, J. Nathan Hohman, Masato M. Maitani, Miquel Salmeron, Yuji Wada

    Journal of Physical Chemistry C   125 ( 25 )   13984 - 13989   2021.7

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    Interfacial Schottky barriers can impact the catalytic function of Pt on TiO2. Since the electronic structure is characteristic of each material, it may be advantageous to tailor the interfacial Schottky barrier by the addition of adsorbed layers. Here, we show that the Schottky barrier in Pt/TiO2can be mitigated by the insertion of self-assembled monolayers (SAM) of carboranethiols that possess an oriented dipole moment. A Pt substrate with the SAM on which TiO2nanoparticles are deposited is used to that effect. Kelvin Probe Force Microscopy shows thatm-9-carboranethiolate SAM with perpendicular dipole moments decreases the potential difference between TiO2and Pt by ∼0.3 eV due to the interfacial electric field of the SAM. Our findings open new opportunities for tailoring interfacial electronic structures not only in the metal-semiconductor junction, but also the semiconductor heterojunctions.

    DOI: 10.1021/acs.jpcc.1c00993

  • Reduction of metal oxides using thermogravimetry under microwave irradiation Reviewed International journal

    Satoshi Fujii, Masahiro Yamamoto, Naoto Haneishi, Shuntaro Tsubaki, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

    AIP Advances   11 ( 6 )   2021.6

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    Chemical reactions performed under microwave irradiation often demonstrate high reaction rates, high selectivity, and low reaction temperatures, which allows for more compact reactors and more energy-efficient processes than used in conventional heating methods. In this study, we discovered a new chemical reaction and proposed a new material synthesis method, performed using a solid-state microwave source with an oscillator and a single-mode cavity. We developed a microwave heating thermogravimetry apparatus to confirm that microwave irradiation reduced the temperature of the reduction process. Next, we applied this apparatus to the reduction process of copper oxide with carbon as the reducing agent and compared microwave heating with conventional heating. We demonstrated that the reduction temperature of microwave heating was 192 °C in a magnetic (H) field and 265 °C in an electric (E) field, which were lower than those of conventional heating. For microwave heating in the E-field, plasma strongly affected the reaction process, leading to a reduction in the reaction temperature. For microwave heating in the H-field, localized heating occurred and the average reaction temperature was lower. Using the obtained results, an applicator suitable for these modes can be designed, enabling a reduction process with an additional energy-saving effect.

    DOI: 10.1063/5.0050907

  • Fourfold daily growth rate in multicellular marine alga Ulva meridionalis

    Masanori Hiraoka, Yutaro Kinoshita, Motoki Higa, Shuntaro Tsubaki, Alvin P. Monotilla, Ayumu Onda, Akinori Dan

    Scientific Reports   10 ( 1 )   2020.12

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    © 2020, The Author(s). Microalgae with high growth rates have been considered as promising organisms to replace fossil resources with contemporary primary production as a renewable source. However, their microscopic size makes it hard to be harvested for industrial applications. In this regard, multicellular macroalgae are more suitable for harvesting. Here, we show that Ulva meridionalis has the highest growth rate ever reported for a multicellular autotrophic plant. Contrasted to the known bloom-forming species U. prolifera growing at an approximately two-fold growth rate per day in optimum conditions, U. meridionalis grows at a daily rate of over fourfold. The high growth ability of this multicellular alga would provide the most effective method for CO2 fixation and biomass production.

    DOI: 10.1038/s41598-020-69536-4

  • Real-Time Facile Detection of the WO3 Catalyst Oxidation State under Microwaves Using a Resonance Frequency

    Shuntaro Tsubaki, Tomoki Higuchi, Tomoki Matsuzawa, Satoshi Fujii, Masateru Nishioka, Yuji Wada

    ACS Omega   2020.12

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    © 2020 American Chemical Society. Microwaves (MWs) are often used to enhance various heterogeneous catalytic reactions. Here, we demonstrate real-time monitoring of a catalyst's oxidation state in a microwave catalytic reaction using a resonance frequency. The changes in the catalyst's oxidation state during the reaction induced changes in the resonance frequency in the cavity resonator. The resonance frequency was not affected by 2-propanol adsorption, while the frequency decreased with the reduction of WO3 → WO3-x. That is, the redox state of the WO3 catalyst could be detected using the resonance frequency. The oxidation state of the WO3 catalyst was then directly observed by the resonance frequency during the dehydration reaction of 2-propanol by microwaves as a model reaction. Resonance frequency monitoring revealed that the enhanced dehydration of 2-propanol by microwaves was attributable to the reduction of the WO3 catalyst. Moreover, the temporal changes in the oxidation state of the WO3 catalyst detected by the resonance frequency coincided with that observed by operando Raman spectroscopy. Therefore, real-time resonance frequency monitoring allowed facile detection of the bulk catalyst oxidation state under microwaves without using any spectroscopic apparatus.

    DOI: 10.1021/acsomega.0c04862

  • Probing rapid carbon fixation in fast-growing seaweed Ulva meridionalis using stable isotope 13C-labelling

    Shuntaro Tsubaki, Hiroshi Nishimura, Tomoya Imai, Ayumu Onda, Masanori Hiraoka

    Scientific Reports   10 ( 1 )   2020.12

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    © 2020, The Author(s). The high growth rate of Ulva seaweeds makes it a potential algal biomass resource. In particular, Ulva meridionalis grows up to fourfold a day. Here, we demonstrated strong carbon fixation by U. meridionalis using 13C stable isotope labelling and traced the 13C flux through sugar metabolites with isotope-ratio mass spectrometry (IR-MS), Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), 13C-nuclear magnetic resonance spectrometry (13C-NMR), and gas chromatography-mass spectrometry (GC–MS). U. meridionalis was first cultured in 13C-labelled enriched artificial seawater for 0–12 h, and the algae were collected every 4 h. U. meridionalis grew 1.8-fold (dry weight), and the 13C ratio reached 40% in 12 h, whereas 13C incorporation hardly occurred under darkness. At the beginning of the light period, 13C was incorporated into nucleic diphosphate (NDP) sugars in 4 h, and 13C labelled peaks were identified using FT-ICR-MS spectra. Using semiquantitative 13C-NMR measurements and GC–MS, 13C was detected in starch and matrix polysaccharides after the formation of NDP sugars. Moreover, the 14:10 light:dark regime resulted into 85% of 13C labelling was achieved after 72 h of cultivation. The rapid 13C uptake by U. meridionalis shows its strong carbon fixation capacity as a promising seaweed biomass feedstock.

    DOI: 10.1038/s41598-020-77237-1

  • Microwave Irradiation Process for Al–Sc Alloy Production Reviewed

    Satoshi Fujii, Eiichi Suzuki, Naomi Inazu, Shuntaro Tsubaki, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

    Scientific Reports   10 ( 1 )   2020.12

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    © 2020, The Author(s). Scandium is being explored as an alloying element for aluminium alloys, which are gaining importance as high-performance lightweight structural alloys in the transportation industry. Sc-rich ScAlN thin films show strong piezoelectricity and can be fabricated on a hard substrate for use as wideband surface acoustic wave filters in next-generation wireless mobile communication systems. However, the use of ScAlN thin films in microelectromechanical system devices is limited by the high cost of metallic Sc, which is due to the difficulty in smelting of this material. Here, we propose a novel microwave irradiation process for producing Al-Sc alloys, with Mg ions as a reducing agent. Although scandium oxide is thermodynamically stable, intermetallic Al3Sc is obtained in high yield (69.8%) via a low-temperature (660 °C) reduction reaction under microwave irradiation. Optical spectroscopy results and thermodynamic considerations suggest a non-thermal equilibrium reaction with the univalent magnesium ions excited by microwave irradiation.

    DOI: 10.1038/s41598-020-59664-2

  • Hole Accumulation at the Grain Boundary Enhances Water Oxidation at α-Fe2O3 Electrodes under a Microwave Electric Field Reviewed

    Masayuki Matsuhisa, Shuntaro Tsubaki, Fuminao Kishimoto, Satoshi Fujii, Iku Hirano, Masahiro Horibe, Eiichi Suzuki, Ryota Shimizu, Taro Hitosugi, Yuji Wada

    Journal of Physical Chemistry C   124 ( 14 )   7749 - 7759   2020.4

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    Copyright © 2020 American Chemical Society. We studied the effects of surface morphology and carrier distribution of α-Fe2O3 electrodes on the enhancement of water electrolysis under microwave (MW) irradiation. We deposited α-Fe2O3 electrodes with various morphologies on Nb-doped rutile TiO2 (100) substrates. α-Fe2O3 films with rough and flat surfaces were deposited using electrodeposition (ED) and pulsed laser deposition (PLD), respectively. The ED α-Fe2O3 film showed a larger response to the MW electric field applied to the electrodes than did the PLD film. In addition, the response was linearly correlated with the MW electric field intensity. Using scanning MW microscopy, we found that the local MW susceptibility of the α-Fe2O3 electrode was enhanced at the grain boundary of the ED α-Fe2O3 film. Analysis of the surface band structure of both ED and PLD α-Fe2O3 films using electrochemical impedance spectroscopy showed that the ED α-Fe2O3 film had a wider depleted layer, indicating increased accumulation of holes on the surface of the electrode to enhance water oxidation. We concluded that the accumulation of holes at the grain boundary of the ED α-Fe2O3 film determines the enhancement of water oxidation under an MW electric field.

    DOI: 10.1021/acs.jpcc.9b11179

  • A Facile Formation of Vanadium(0) by the Reduction of Vanadium Pentoxide Pelletized with Magnesium Oxide Enabled by Microwave Irradiation Reviewed

    Naomi Inazu, Eiichi Suzuki, Satoshi Fujii, Shuntaro Tsubaki, Yuji Wada

    ChemistrySelect   5 ( 10 )   2949 - 2953   2020.3

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    © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The reduction of V2O5 to vanadium metal(0), that requires severe conditions in conventional reduction methods, was enabled to be proceeded in a short time of 1 h at 1273 K by the reaction with magnesium vapor with the isolation yield of V(0) in 55.6% by using microwave irradiation of 820 W. A pressurized pelletization of powdery V2O5 well-mixed with MgO powder at a specific mixing ratio followed by calcination in ambient air at 1173 K was crucial for the reaction since a complex oxide of MgV2O4, presumably as a precursor, was formed in calcination of the V2O5/MgO pellet to be reduced to V(0) by the reaction with magnesium. Calcination of V2O5/MgO pellets with different mixing ratios or different temperatures resulted in the formation of different kinds of complex oxide of vanadium and magnesium such as α-Mg2V2O7, Mg3(VO4)2, triclinic Mg2V2O7, and MgV2O6. While the yield of V(0) was dependent on the kind of the complex oxide, formation of MgV2O4 was essential as the precursor to the formation of V(0).

    DOI: 10.1002/slct.201904547

  • Operando Raman Spectroscopy of the Microwave-Enhanced Catalytic Dehydration of 2-Propanol by WO<inf>3</inf> Reviewed

    Shuntaro Tsubaki, Tomoki Matsuzawa, Eiichi Suzuki, Satoshi Fujii, Yuji Wada

    Industrial and Engineering Chemistry Research   59 ( 5 )   1781 - 1788   2020.2

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    Copyright © 2020 American Chemical Society. Operando Raman spectroscopy was performed to understand the mechanism of a microwave (MW)-enhanced fixed-bed catalytic reaction. An MW operando Raman spectroscopy system was constructed by integrating a Raman spectroscopy probe (785 nm) with a single-mode (TM110) MW cavity resonator equipped with a semiconductor MW generator. MW heating enhanced the dehydration of 2-propanol to diisopropyl ether and propylene by +54 to +60% under the air flow condition. In the argon flow condition, the conversion of 2-propanol was further enhanced by +71 to +83% with >99.9% selectivity toward propylene when MW heating was used. Operando Raman spectroscopy revealed that MW irradiation enhances the reduction of the WO3 surface and exhibits intense light emission, especially under the argon flow condition. The enhanced generation of WO3-x species on the surface of the WO3 catalyst should be, therefore, a key factor in the enhancement of the dehydration of 2-propanol under MW irradiation.

    DOI: 10.1021/acs.iecr.9b03876

  • Production of Bio Hydrofined Diesel, Jet Fuel, and Carbon Monoxide from Fatty Acids Using a Silicon Nanowire Array-Supported Rhodium Nanoparticle Catalyst under Microwave Conditions Reviewed

    Heeyoel Baek, Keiichiro Kashimura, Takashi Fujii, Shuntaro Tsubaki, Yuji Wada, Shigenori Fujikawa, Takuma Sato, Yasuhiro Uozumi, Yoichi M.A. Yamada

    ACS Catalysis   10 ( 3 )   2148 - 2156   2020.2

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    Copyright © 2020 American Chemical Society. Biodiesel was efficiently produced from biomass fatty acids using renewable gas H2 and a reusable heterogeneous catalyst under low-energy-consumption microwave conditions. As the decarboxylation of fatty acids to alkanes is an important transformation in the production of bio hydrofined diesel (BHD) and jet fuel, we herein report the development of a highly active and reusable Rh nanoparticle catalyst supported by a silicon nanowire array (SiNA-Rh) and its application in the decarboxylation of fatty acids to alkanes under mild conditions. More specifically, SiNA-Rh (500 mol ppm) selectively promoted the hydrogenative decarboxylation reaction at 200 °C under microwave irradiation (∼40 W) in a H2 atmosphere (10 bar) to afford the corresponding alkanes in high yields selectively. The only coproduct observed was carbon monoxide, an important and essential staple for the chemical industry. Importantly, carbon dioxide formation was not observed. Moreover, the aldehydes were efficiently converted to alkanes by SiNA-Rh, and this catalyst was reused 20 times without any loss in catalytic activity. Finally, to investigate the effects of microwave irradiation on the enhancement of this chemical transformation based on the Si nanorod structures present in the SiNA-Rh catalyst, the effect of the microwave electric field and magnetic field in the microwave to the reaction was experimentally investigated, and the spatial distribution of the electric field intensity around the surface of the Si nanostructure was simulated using the finite element method.

    DOI: 10.1021/acscatal.9b04784

  • Kinetic analysis of microwave-enhanced cellulose dissolution in ionic solvents Invited Reviewed International journal

    Sanchez, Pablo B.; Tsubaki, Shuntaro; Padua, Agilio A. H.; Wada, Yuji

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   22 ( 3 )   1003 - 1010   2020.1

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    DOI: 10.1039/c9cp06239d

  • Drastic microwave heating of percolated Pt metal nanoparticles supported on Al<inf>2</inf>O<inf>3</inf> substrate Reviewed

    Taishi Ano, Masato M. Maitani, Yuka Sato, Shuntaro Tsubaki, Yuji Wada

    Processes   8 ( 1 )   2020.1

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    © 2019 by the authors. Microwave (MW) heating of supported metal nanoparticles (NPs) presents attractive effects on catalysis such as the rapid heating processes and the enhancement of the reaction rate. Improving the heating property of the NPs, which act as the catalytic active sites, the MW effects will become more significant. Here we show a systematic study about the supported Pt NPs structure to improve the MW heating property. We found that the drastic heating was induced by a percolated Pt NPs structure, where the conduction electrons move around in the two-dimensional network. On the other hand, no heating was observed in an isolated Pt NPs system with the confined electrons. We conclude that the percolation of the Pt NPs giving the network structure is one of the important key factors for the efficient MW heating. The optimized Pt NPs catalyst leads to the dramatic MW effects on catalytic reactions.

    DOI: 10.3390/pr8010072

  • Enhancement of Fixed-bed Flow Reactions under Microwave Irradiation by Local Heating at the Vicinal Contact Points of Catalyst Particles Reviewed

    Naoto Haneishi, Shuntaro Tsubaki, Eriko Abe, Masato M. Maitani, Ei ichi Suzuki, Satoshi Fujii, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

    Scientific Reports   9 ( 1 )   222   2019.12

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    © 2019, The Author(s). The formation of local high temperature regions, or so-called “hot spots”, in heterogeneous reaction systems has been suggested as a critical factor in the enhancement of chemical reactions using microwave heating. In this paper, we report the generation of local high temperature regions between catalyst particles under microwave heating. First, we demonstrated that reaction rate of the dehydrogenation of 2-propanol over a magnetite catalyst was enhanced 17- (250 °C) to 38- (200 °C) fold when heated with microwave irradiation rather than an electrical furnace. Subsequently, the existence of microwave-generated specific local heating was demonstrated using a coupled simulation of the electromagnetic fields and heat transfer as well as in situ emission spectroscopy. Specific high-temperature regions were generated at the vicinal contact points of the catalyst particles due to the concentrated microwave electric field. We also directly observed local high temperature regions at the contact points of the particles during microwave heating of a model silicon carbide spherical material using in situ emission spectroscopy. We conclude that the generation of local heating at the contact points between the catalyst particles is a key factor for enhancing fixed-bed flow reactions under microwave irradiation.

    DOI: 10.1038/s41598-018-35988-y

  • Microwave-assited solubilization of microalgae in high-temperature ethylene glycol Reviewed

    Shuntaro Tsubaki, Kiriyo Oono, Ayumu Onda, Takashi Kadono, Masao Adachi, Tomohiko Mitani

    Biomass and Bioenergy   130   105360   2019.9

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    Microwave-assited solubilization of microalgae in high-temperature ethylene glycol

    DOI: 10.1016/j.biombioe.2019.105360

  • Fractionation of plant-cuticle-based bio-oils by microwave-assisted methanolysis combined with hydrothermal pretreatment and enzymatic hydrolysis Invited Reviewed International journal

    Tsubaki, Shuntaro; Oono, Kiriyo; Onda, Ayumu

    HELIYON   5 ( 6 )   2019.6

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    DOI: 10.1016/j.heliyon.2019.e01887

  • Remote Control of Electron Transfer Reaction by Microwave Irradiation: Kinetic Demonstration of Reduction of Bipyridine Derivatives on Surface of Nickel Particle Invited Reviewed International journal

    Kishimoto, Fuminao; Matsuhisa, Masayuki; Imai, Takashi; Mochizuki, Dai; Tsubaki, Shuntaro; Maitani, Masato M.; Suzuki, Eiichi; Wada, Yuji

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   10 ( 12 )   3390 - 3394   2019.6

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    DOI: 10.1021/acs.jpclett.9b00629

  • In situ Raman monitoring of dielectric-heating-enhanced freeze-drying under different electromagnetic wave frequencies Reviewed

    S. Tsubaki, T. Matsuzawa, S. Fujii, Eiichi Suzuki, H. Kanamori, T. Hoshino, S. Hosoda, Y. Wada

    RSC Advances   2019 ( 9 )   9001 - 9005   2019.3

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    In situ Raman monitoring of dielectric-heating-enhanced freeze-drying under different electromagnetic wave frequencies

  • Proton-Enhanced Dielectric Properties of Polyoxometalates in Water under Radio-Frequency Electromagnetic Waves Reviewed

    Shuntaro Tsubaki, Shogo Hayakawa, Tadaharu Ueda, Tomohiko Mitani, Ei-ichi Suzuki, Satoshi Fujii, Yuji Wada

    Materials   11   1202   2018.7

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    Proton-Enhanced Dielectric Properties of Polyoxometalates in Water under Radio-Frequency Electromagnetic Waves

    DOI: 10.3390/ma11071202

  • Reversible Mechanochlomic Luminescence of a Heteroatom-Free Helically Chiral Hydrocarbon Reviewed

    Ryota Yamano, Yu Shibata, Fuminao Kishimoto, Shuntaro Tsubaki, Yuji Wada, Ken Tanaka

    Chem. Lett.   vol. 47 ( No. )   pp. 1228 - 1231   2018.7

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    Reversible Mechanochlomic Luminescence of a Heteroatom-Free Helically Chiral Hydrocarbon

  • Effect of Aspect Ratio on the Permittivity of GraphiteFiber in Microwave Heating Reviewed

    Jun Fukushima, Shuntaro Tsubaki, Tomoki Matsuzawa, Keiichiro Kashimura, Tomohiko Mitani, Tomoaki Namioka, Satoshi Fujii, Naoki Shinohara, Hirotsugu Takizawa, Yuji Wada

    Materials   11   169   2018.1

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    Effect of Aspect Ratio on the Permittivity of GraphiteFiber in Microwave Heating

  • Acceleration of Water Electrolysis by Accumulation of Microwave Energy at a Pt Disk Electrode Reviewed

    Fuminao Kishimoto, Kah Hon Leong, Shinichiro Kawamura, Naoto Haneishi, Shuntaro Tsubaki, Yuji Wada

    CHEMISTRY LETTERS   46 ( 11 )   1593 - 1596   2017.11

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    The current density of water reduction using a commercial Pt disk electrode was enhanced under 2.45 GHz microwave irradiation. The transitional alternation of temperature distribution was explained with a heat-transfer simulation using COMSOL Multiphysics based on the finite element method. Results show that most of the microwave energy was converted into thermal energy at the vicinity of the Pt electrode. A local high-temperature region enhancing the water-reduction reaction was hence formed.

    DOI: 10.1246/cl.170686

  • Smelting of Scandium by Microwave Irradiation Reviewed

    Satoshi Fujii, Shuntaro Tsubaki, Naomi Inazu, Eiichi Suzuki, Yuji Wada

    Materials   10   1138   2017.9

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    Smelting of Scandium by Microwave Irradiation

  • Is Selective Heating of the Sulfonic Acid Catalyst AC-SO3H by Microwave Radiation Crucial in the Acid Hydrolysis of Cellulose to Glucose in Aqueous Media? Reviewed

    Satoshi Horikoshi, Takashi Minagawa, Shuntaro Tsubaki, Ayumu Onda, Nick Serpone

    CATALYSTS   7 ( 8 )   231   2017.8

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    Selective heating of microwave-absorbing solid catalysts in a heterogeneous medium may affect a chemical reaction; such selectivity cannot be achieved by conventional oil-bath or steam heating methods. Moreover, microwave methods are often misunderstood with respect to equipment and temperature measurements, so that additional experimentation is necessary. In this regard, the present study intended to clarify the effect of microwave selective heating on acid hydrolytic processes using a sulfonated activated carbon catalyst (AC-SO3H). The model reaction chosen was the acid hydrolysis of cellulose carried out in a Pyrex glass microwave reactor, with the process being monitored by examining the quantity of total sugar, reducing sugar, and glucose produced. Heat transfer from the catalyst to the aqueous solution through absorption of microwaves by the catalyst occurred as predicted from a simulation of heat transfer processes. The resulting experimental consequences are compared with those from the more uniform microwave conduction heating method by also performing the reaction in a SiC microwave reactor wherein microwaves are absorbed by SiC. Some inferences of the influence of microwave selective heating of carbon-based catalyst particles are reported. Under selective heating conditions (Pyrex glass reactor), the yield of glucose from the acid hydrolysis of cellulose was 56% upon microwave heating at 200 degrees C, nearly identical with the yield (55%) when the hydrolytic process was performed under mainly conventional heating conditions in the SiC reactor. Although the beneficial effect of catalyst selective heating was not reflected in the reaction efficiency, there were substantial changes in the state of adsorption of cellulose on the catalyst surface.

    DOI: 10.3390/catal7080231

  • Catalytic Hydrolysis of Polysaccharides Derived from Fast-Growing Green Macroalgae Reviewed

    Ayumu Onda, Sayuri Onda, Miyuki Koike, Kazumichi Yanagisawa, Shuntaro Tsubaki, Masanori Hiraoka

    CHEMCATCHEM   9 ( 14 )   2638 - 2641   2017.7

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    Green macroalgae, such as Ulva spp., has a higher growth rate than terrestrial lingocellulosic biomass, which often leads to serious environmental issues such as green tide. So, it is a promising feedstock for biorefineries. Hiraoka produced Ulva with reproducible compositions and sizes by our original cultivation method. The macroalgae contained approximately 35 wt% of a soluble polysaccharide called ulvan, which is a sulfated glucuronorhamnan polysaccharide. The catalytic conversion of extracted ulvan was performed under hydrothermal conditions at 130 degrees C by using solid acid catalysts. The Amberlyst 70 catalyst has a stable structure and gave monosaccharides in quantitative yield, predominantly in the form of rhamnose. The Amberlyst 70 catalyst showed higher activity than sulfonated activated- carbon (AC-SO3H) in the hydrothermal conversion of ulvan, although Amberlyst 70 showed lower catalytic activity than AC-SO3H in the hydrolysis of starch.

    DOI: 10.1002/cctc.201700100

  • Water vaporization from deposited sand by microwave cavity resonator Reviewed International journal

    Hiroshi Yokawa, Hirokazu Mutou, Shuntaro Tsubaki, Naoto Haneishi, Takashi Fuji, Norio Asano, Keiichiro Kashimura, Tomohiko Mitani, Satoshi Fujii, Naoki Shinohara, Yuji Wada

    Journal of Civil & Environmental Engineering   7 ( 4 )   2017.7

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    DOI: 10.4172/2165-784X.1000279

  • Electromagnetic and Heat-Transfer Simulation of the Catalytic Dehydrogenation of Ethylbenzene under Microwave Irradiation Reviewed

    Naoto Haneishi, Shuntaro Tsubaki, Masato M. Maitani, Eiichi Suzuki, Satoshi Fujii, Yuji Wada

    INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH   56 ( 27 )   7685 - 7692   2017.7

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    Electromagnetic and heat-transfer simulations were used to study the effects of microwave-generated nonuniform temperature distributions in a catalyst bed on the rate enhancement of a fixed-bed flow reaction. We used the dehydrogenation of ethylbenzene over a magnetite catalyst as a model reaction. During the microwave reaction, a temperature gradient was generated in the catalyst bed; the highest temperature occurred at the core of the catalyst bed, and it parabolically decreased toward the surface. Using these simulation results and Arrhenius parameters, the reaction rates were estimated by considering the nonuniform temperature distribution. The measured reaction rate was 36% larger than the simulated value, indicating that the rate enhancement under microwaves can, not only be attributed to the nonuniform temperature distribution in the catalyst bed. This could be due to nonequilibrium local heating (the so-called hot spot) in the very small region around the catalyst particle.

    DOI: 10.1021/acs.iecr.7601413

  • Crystalline orientation control using self-assembled TiO2 nanosheet scaffold to improve CH3NH3PbI3 perovskite solar cells Reviewed

    Masato M. Maitani, Hirokazu Satou, Aoi Ohmura, Shuntaro Tsubaki, Yuji Wada

    Japanese Journal of Applied Physics   56 ( 8S2 )   08MC17   2017.7

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    Crystalline orientation control using self-assembled TiO2 nanosheet scaffold to improve CH3NH3PbI3 perovskite solar cells

  • Microwave Application to Efficient Annealing Process of CH3NH3PbI3 Perovskite Crystalline Films Reviewed

    Masato M. Maitani, Daikichi Iso, Junbeom Kim, Shuntaro Tsubaki, Yuji Wada

    ELECTROCHEMISTRY   85 ( 5 )   236 - 240   2017.5

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    As next-generation printable solar cells, perovskite solar cell utilizing organometal halide perovskite crystalline semiconductor as the active layer has been considered as one of the most promising systems for its high efficiency (> similar to 22%) and construction with low-cost materials. Annealing process of organometal halide perovskite crystalline films are, however, relatively time-consuming process for the perovskite solar cells. We propose the microwave heating applied to the annealing process of the CH3NH3PbI3 perovskite crystalline films for converting the intermediate state of as-coated precursor films into perovskite poly-crystalline films. Observed rapid conversion process into perovskite crystals with higher crystallinity and even the degradation of perovskite to be PbI2 by evaporation of methylammonium iodide at relatively lower temperature to the conventional hotplate heating imply a promising potential to achieve novel high throughput annealing process with high-quality crystallinity of perovskite films at low-temperature due to direct and effective heating of CH3NH3PbI3 films by the microwave irradiation. (C) The Electrochemical Society of Japan, All rights reserved.

    DOI: 10.5796/electrochemistry.85.236

  • Smelting Magnesium Metal using a Microwave Pidgeon Method Reviewed

    Yuji Wada, Satoshi Fujii, Eiichi Suzuki, Masato M. Maitani, Shuntaro Tsubaki, Satoshi Chonan, Miho Fukui, Naomi Inazu

    SCIENTIFIC REPORTS   7   46512   2017.4

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    Magnesium (Mg) is a lightweight metal with applications in transportation and sustainable battery technologies, but its current production through ore reduction using the conventional Pidgeon process emits large amounts of CO2 and particulate matter (PM2.5). In this work, a novel Pidgeon process driven by microwaves has been developed to produce Mg metal with less energy consumption and no direct CO2 emission. An antenna structure consisting of dolomite as the Mg source and a ferrosilicon antenna as the reducing material was used to confine microwave energy emitted from a magnetron installed in a microwave oven to produce a practical amount of pure Mg metal. This microwave Pidgeon process with an antenna configuration made it possible to produce Mg with an energy consumption of 58.6 GJ/t, corresponding to a 68.6% reduction when compared to the conventional method.

    DOI: 10.1038/srep46512

  • Microwave-assisted hydrothermal extraction of sulfated polysaccharides from Ulva spp. and Monostroma latissimum Reviewed

    Shuntaro Tsubaki, Kiriyo Oono, Masanori Hiraoka, Ayumu Onda, Tomohiko Mitani

    FOOD CHEMISTRY   210   311 - 316   2016.11

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    Microwave-assisted hydrothermal extraction was applied for production of sulfated polysaccharides from Ulva spp. and Monostroma latissimum. The maximum ulvan yields attained 40.4 +/- 3.2% (Ulva meridionalis) and 36.5 +/- 3.1% (Ulva ohnoi) within 4 min of come-up time and 10 min of extraction time at 160 degrees C, respectively. The rhamnan sulfate yield from M. latissimum further attained 53.1 +/- 7.2% at 140 degrees C. The sulfated polysaccharides were easily recovered from the extract by simple ethanol precipitation. In addition, molecular weights and viscosity of the extracted polysaccharides could be controlled by varying the extraction temperature. Dielectric measurement revealed that ionic conduction was the important parameter that affect the microwave susceptibility of algae-water mixture. The sulfated polysaccharides extracts are expected as potential feedstock for medical and food applications. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodchem.2016.04.121

  • Enhancement of anodic current attributed to oxygen evolution on α-Fe2O3 electrode by microwave oscillating electric field Reviewed

    Fuminao Kishimoto, Masayuki Matsuhisa, Shinichiro Kawamura, Satoshi Fujii, Shuntaro Tsubaki, Masato M. Maitani, Eiichi Suzuki, Yuji Wada

    Scientific Reports   6   35554   2016.10

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    Enhancement of anodic current attributed to oxygen evolution on alpha-Fe2O3 electrode by microwave oscillating electric field
    Various microwave effects on chemical reactions have been observed, reported and compared to those carried out under conventional heating. These effects are classified into thermal effects, which arise from the temperature rise caused by microwaves, and non-thermal effects, which are attributed to interactions between substances and the oscillating electromagnetic fields of microwaves. However, there have been no direct or intrinsic demonstrations of the non-thermal effects based on physical insights. Here we demonstrate the microwave enhancement of oxidation current of water to generate dioxygen with using an alpha-Fe2O3 electrode induced by pulsed microwave irradiation under constantly applied potential. The rectangular waves of current density under pulsed microwave irradiation were observed, in other words the oxidation current of water was increased instantaneously at the moment of the introduction of microwaves, and stayed stably at the plateau under continuous microwave irradiation. The microwave enhancement was observed only for the alpha-Fe2O3 electrode with the specific surface electronic structure evaluated by electrochemical impedance spectroscopy. This discovery provides a firm evidence of the microwave special non-thermal effect on the electron transfer reactions caused by interaction of oscillating microwaves and irradiated samples.

    DOI: 10.1038/srep35554

  • Distance-depending Photoinduced Electron Transfer at Two-dimensional Interface in Alternate Stacked Structures of Tantalate Nanosheets and Tungstate Nanosheets Reviewed

    Taishi Ano, Fuminao Kishimoto, Dai Mochizuki, Shuntaro Tsubaki, Masato M. Maitani, Eiichi Suzuki, Yuji Wada

    CHEMISTRY LETTERS   45 ( 9 )   1111 - 1113   2016.9

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    We demonstrate the electron transfer from the conduction band of tantalate nanosheets to that of tungstate nanosheets depending on the interlayer distance in the alternate-stacked structure prepared by the thiol-ene click reaction of thiol-grafted tantalate nanosheets and alkene-grafted tungstate nanosheets. The interlayer distance is precisely controlled from 0.93 to 1.64 nm by changing the methylene chain number of the organic bridges. The logarithm of the rate constant of the electron transfer decreases linearly with the distance.

    DOI: 10.1246/cl.160526

  • In situ temperature measurements of reaction spaces under microwave irradiation using photoluminescent probes Reviewed

    Taishi Ano, Fuminao Kishimoto, Ryo Sasaki, Shuntaro Tsubaki, Masato M. Maitani, Eiichi Suzuki, Yuji Wada

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   18 ( 19 )   13173 - 13179   2016.5

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    We demonstrate two novel methods for the measurement of the temperatures of reaction spaces locally heated by microwaves, which have been applied here to two example systems, i.e., BaTiO3 particles covered with a SiO2 shell (BaTiO3-SiO2) and layered tungstate particles. Photoluminescent (PL) probes showing the temperature-sensitivity in their PL lifetimes are located in the nanospaces of the above systems. In the case of BaTiO3-SiO2 core-shell particles, rhodamine B is loaded into the mesopores of the SiO2 shell covering the BaTiO3 core, which generates the heat through the dielectric loss of microwaves. The inner nanospace temperature of the SiO2 shell is determined to be 28 degrees C higher than the bulk temperature under microwave irradiation at 24 W. On the other hand, Eu3+ is immobilized in the interlayer space of layered tungstate as the PL probe, showing that the nanospace temperature of the interlayer is only 4 degrees C higher than the bulk temperature. This method for temperature-measurement is powerful for controlling microwave heating and elucidates the ambiguous mechanisms of microwave special effects often observed in chemical reactions, contributing greatly to the practical application of microwaves in chemistry and materials sciences.

    DOI: 10.1039/c6cp02034h

  • Effects of ionic conduction on hydrothermal hydrolysis of corn starch and crystalline cellulose induced by microwave irradiation Reviewed

    Shuntaro Tsubaki, Kiriyo Oono, Ayumu Onda, Kazumichi Yanagisawa, Tomohiko Mitani, Jun-ichi Azuma

    CARBOHYDRATE POLYMERS   137 ( 10 )   594 - 599   2016.2

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    This study investigated the effects of ionic conduction of electrolytes under microwave field to facilitate hydrothermal hydrolysis of corn starch and crystalline cellulose (Avicel), typical model biomass substrates. Addition of 0.1 M NaCl was effective to improve reducing sugar yield by 1.61-fold at unit energy (kJ) level. Although Avicel cellulose was highly recalcitrant to hydrothermal hydrolysis, addition of 0.1 M MgCl2 improved reducing sugar yield by 6.94-fold at unit energy (kJ). Dielectric measurement of the mixture of corn starch/water/electrolyte revealed that ionic conduction of electrolytes were strongly involved in facilitating hydrothermal hydrolysis of polysaccharides. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbpol.2015.11.022

  • Effects of acidic functional groups on dielectric properties of sodium alginates and carrageenans in water

    Shuntaro Tsubaki, Masanori Hiraoka, Shingo Hadano, Kei Okamura, Tadaharu Ueda, Hiroshi Nishimura, Keiichiro Kashimura, Tomohiko Mitani

    Carbohydrate Polymers   115   78 - 87   2015.1

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    © 2014 Elsevier Ltd. All rights reserved. This study investigated the dielectric properties of sodium alginates and carrageenans in water at frequencies between 100 MHz and 20 GHz in regard to water-hydrocolloid interactions via acidic functional groups. Both sodium alginates and carrageenans showed conduction loss at lower frequencies and dielectric loss at higher frequencies. Reduction and desulfation of sodium alginates and carrageenans, which decreased the numbers of acidic functional groups, decreased their conduction loss. In addition, H+-form carrageenans showed the highest ionic conduction. Correlational analysis of dielectric properties and related physical parameters showed that the loss tangent (tanδ) of the hydrocolloid solution was determined by the conductivity of the aqueous solution. Especially at pH below 2, strong H+conduction was associated with high tanδ probably due to the Grotthuss mechanism. The molecular dynamics of free water and H+, viscosity conditions were also suggested to be associated with dielectric property of water-hydrocolloid system.

    DOI: 10.1016/j.carbpol.2014.08.092

  • Functional group dependent dielectric properties of sulfated hydrocolloids extracted from green macroalgal biomass

    Shuntaro Tsubaki, Masanori Hiraoka, Shingo Hadano, Hiroshi Nishimura, Keiichiro Kashimura, Tomohiko Mitani

    Carbohydrate Polymers   107 ( 1 )   192 - 197   2014.7

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    Dielectric properties of aqueous solutions of sulfated hydrocolloids (ulvan and rhamnan sulfate) extracted from green macroalgal biomass were studied in a frequency range of 100 MHz-10 GHz. Counterion exchange of native hydrocolloids (mixture of Na+, Mg2+ and Ca2+) to H +-form showed significant increase in loss factor due to ionic conduction. On the other hand, desulfations decreased their loss factors. The results suggested that ionic conduction of H+ has significant contribution to loss factors. Additionally, H+-form hydrocolloids showed significant improvement in hydration, which might also affect the dielectric property of the solution by reducing the amount of free water. The viscosity, however, did not show apparent relevance with the dielectric property. © 2014 Elsevier Ltd.

    DOI: 10.1016/j.carbpol.2014.03.002

  • Cassava pulp hydrolysis under microwave irradiation with oxalic acid catalyst for ethanol production Reviewed International journal

    Euis Hermiati, Shuntaro Tsubaki, Jun-ichi Azuma

    Journal of Mathematical and Fundamental Sciences   46 ( 2 )   125 - 139   2014.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5614/j.math.fund.sci.2014.46.2.2

  • Hydrolysis of green-tide forming Ulva spp. by microwave irradiation with polyoxometalate cluster Reviewed International journal

    Shuntaro Tsubaki, Kiriyo Oono, Masanori Hiraoka, Tadaharu Ueda, Ayumu Onda, Kazumichi Yanagisawa, Jun-ichi Azuma

    Green Chemistry   16   2277 - 2233   2013.12

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    DOI: 10.1039/C3GC42027B

  • Cuticular Membrane of Fuyu Persimmon Fruit Is Strengthened by Triterpenoid Nano-Fillers

    Shuntaro Tsubaki, Kazuki Sugimura, Yoshikuni Teramoto, Keizo Yonemori, Jun-ichi Azuma

    PLOS ONE   8 ( 9 )   e75275   2013.9

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    The mechanical defensive performance of fruit cuticular membranes (CMs) is largely dependent on the molecular arrangement of their constituents. Here, we elucidated nano-sized interactions between cutin and triterpenoids in the cuticular matrix of Fuyu persimmon fruits (Diospyros kaki Thunb. cv. Fuyu), focusing on the mechanical properties using a combination of polymer analyses. The fruit CMs of Fuyu were primarily composed of wax (34.7%), which was predominantly triterpenoids followed by higher aliphatic compounds, and cutin (48.4%), primarily consisting of 9,10-epoxy-18-hydroxyoctadecanoic acid and 9,10,18-trihydroxyoctadecanoic acid. Based on the tensile tests of the CM, the removal of wax lead to a considerable decrease in the maximum stress and elastic modulus accompanied by an increase in the maximum strain, indicating that wax is of significant importance for maintaining the mechanical strength of the CM. Wide-angle X-ray diffraction and relaxation time measurements using solid-state C-13 nuclear magnetic resonance indicated that the triterpenoids in the cuticular matrix construct a nanocomposite at a mixing scale below 20-24 nm; however, the higher aliphatic compounds did not exhibit clear interactions with cutin. The results indicated that the triterpenoids in the cuticular matrix endow toughness to the CM by functioning as a nanofiller.

    DOI: 10.1371/journal.pone.0075275

  • Microwave-assisted hydrolysis of polysaccharides over polyoxometalate clusters

    Shuntaro Tsubaki, Kiriyo Oono, Tadaharu Ueda, Ayumu Onda, Kazumichi Yanagisawa, Tomohiko Mitani, Jun-ichi Azuma

    BIORESOURCE TECHNOLOGY   144   67 - 73   2013.9

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    Polyoxometalate (POM) clusters were utilized as recyclable acid catalysts and microwave-absorbing agents for the microwave-assisted hydrolysis of corn starch and crystalline cellulose. Phosphotungstic (PW) and silicotungstic (SiW) acids showed high hydrolyzing activity, while phosphomolybdic acid (PMo) showed lower glucose stability. The PW catalyst could be recycled by ether extraction at least 4 times without changing its catalytic activity. The addition of PW could reduce the energy demand required for running the hydrolysis by 17-23%. The dielectric property of the aqueous PW solution was important for increasing the microwave-absorption capability of the reaction system and reducing the energy consumption. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biortech.2013.06.092

  • Comparative decomposition kinetics of neutral monosaccharides by microwave and induction heating treatments

    Shuntaro Tsubaki, Kiriyo Oono, Ayumu Onda, Kazumichi Yanagisawa, Jun-ichi Azuma

    CARBOHYDRATE RESEARCH   375   1 - 4   2013.6

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    The stabilities of five neutral monosaccharides (glucose, galactose, mannose, arabinose, and xylose) were kinetically compared after the molecules were submitted to microwave heating (internal heating) and induction heating (external heating) under completely identical thermal histories by employing PID (proportional, integral, and derivative) temperature controlled ovens and homogeneous mixing. By heating in water at 200 degrees C, the rate constants for the decomposition reactions varied from 2.13 x 10 (4) to 3.87 x 10 (4) s (1) for microwave heating; however, the values increased by 1.1-to 1.5-fold for induction heating. Similarly, in a dilute (0.8%) sulfuric acid solution, the decomposition rate constants varied from 0.61 x 10 (3) to 2.00 x 10 (3) s (1) for microwave heating; however, the values increased by 1.5-to 2.2-fold for induction heating. The results show that microwave heating imparts greater stability to neutral monosaccharides than does induction heating. The undesirable decomposition of monosaccharides at the surface boundary of reactor walls may have increased the probability of monosaccharide decomposition during induction heating. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carres.2013.04.013

  • Compositional analysis of leaf cuticular membranes isolated from tea plants (Camellia sinensis L.)

    Shuntaro Tsubaki, Shunichi Sakumoto, Norihiro Uemura, Jun-ichi Azuma

    FOOD CHEMISTRY   138 ( 1 )   286 - 290   2013.5

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    Chemical constituents of cuticular membranes (CMs) isolated from three tea cultivars (Camellia sinensis (L) O. Kuntze cvs. Yabukita, Samidori and Gokou) were compared. All CMs from the adaxial side of the leaves showed higher accumulation of wax, cutin and polysaccharide, while those from the abaxial side were abundant in cutan, showing the adaptation of the adaxial side to abiotic stresses, such as wind and rain, in contrast to the abaxial side, which provides defence against pathogens. Yabukita, a major tea cultivar in Japan, developed thick CMs while Samidori and Gokou, shade-cultivated tea cultivars, had lighter CMs, reflecting their thin and soft leaves. CMs rapidly accumulated 9,10-epoxy-18-hydroxyoctadecanoic acid at a very early stage of leaf development. Additionally, shade treatment did not influence cutin biosynthesis in CMs, reflecting high adaptation of tea leaves under low light levels. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodchem.2012.10.116

  • Total fractionation of green tea residue by microwave-assisted alkaline pretreatment and enzymatic hydrolysis

    Shuntaro Tsubaki, Jun-ichi Azuma

    BIORESOURCE TECHNOLOGY   131   485 - 491   2013.3

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    Total refinery of constituents of green tea residue was achieved by combination of microwave-assisted alkaline pretreatment and enzymatic hydrolysis. Alkaline pretreatment was effective at separating pectic polysaccharides, protein, phenolic compounds and aliphatic compounds (probably originating from cuticular components), and the solubilization rate was attained 64-74% by heating at 120-200 degrees C. The higher heating value (HHV) of alkali-soluble fraction attained 20.1 MJ/kg, indicating its usability as black-liquor-like biofuel. Successive cellulolytic enzymatic hydrolysis mainly converted cellulose into glucose and attained the maximum solubilization rate of 89%. Final residue was predominantly composed of aliphatic cuticular components with high proportion in 9,10,18-trihydroxyoctadecanoic acid (30.1-48.6%). These cuticular components are potential alternative feedstock for aliphatic compounds commonly found in oil plants. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biortech.2013.01.001

  • Microwave-assisted hydrothermal hydrolysis of cellobiose and effects of additions of halide salts

    Shuntaro Tsubaki, Kiriyo Oono, Ayumu Onda, Kazumichi Yanagisawa, Jun-ichi Azuma

    BIORESOURCE TECHNOLOGY   123   703 - 706   2012.11

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    Microwave irradiation was compared with induction heating for hydrothermal hydrolysis of cellobiose. Microwave heating improved glucose selectivity and resulted in a pH of the hydrolyzates that was <= 0.57 units lower than those from conventional heating, which suggests that fewer side-reactions occurred. Halide salts of alkali and alkali earth metals improved microwave-assisted hydrothermal saccharification of cellobiose at lower reaction severity by around 0.3 of logR(0). NaCl addition of >= 10 mM reduced the required microwave output to 58.6-66.2% as compared to conventional microwave-hydro-thermal hydrolysis without halide salts. Kinetic analyses revealed that the addition of salt increased the hydrolysis rate by increasing the frequency factor of the reaction. The results showed that microwave irradiation in the presence of microwave-absorbing salts is effective for hydrothermal hydrolysis of carbohydrates. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biortech.2012.07.086

  • Refinery of biomass by utilization of specific effects of microwave irradiation Reviewed International journal

    Jun-ichi Azuma, Shuntaro Tsubaki, Masahiro Sakamoto, Rike Yudianti, Euis Hermiati

    Procedia Chemistry   4   17 - 25   2012.8

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    DOI: 10.1016/j.proche.2012.06.003

  • Growth-dependent chemical and mechanical properties of cuticular membranes from leaves of Sonneratia alba

    Yuki Takahashi, Shuntaro Tsubaki, Masahiro Sakamoto, Shin Watanabe, Jun-Ichi Azuma

    PLANT CELL AND ENVIRONMENT   35 ( 7 )   1201 - 1210   2012.7

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    Chemical and mechanical properties of the leaf cuticular membranes (CMs) of a mangrove, Sonneratia alba J. Smith, were analysed at various leaf development stages to evaluate their tolerance to environmental stress. Our analyses demonstrate that the CMs from leaves of S. alba at different growth stages are generally rich in wax (21.525.7%) and cutin (52.463.4%) which rapidly accumulate at the early stages of leaf growth, while cutan (4.310.3%) and polysaccharide (2.37.7%) continuously accumulate throughout growth. Immature CMs are physically weak and highly viscoelastic. However, CMs become strengthened and stiffened during leaf expansion and maturation (by factors of about 1.5 and 2.4, respectively) while their flexibility decreases (6883% decrease). Finally, the CMs lose their strength at the senescent stage (3043% decreasement). Correlation analysis between chemical composition and mechanical properties revealed that the cutin matrix is mainly responsible for the high viscoelastic properties of CMs, while wax, cutan and polysaccharide contributed to their elasticity. Wax also affected the strength of the CMs, whereas cutan and polysaccharide showed rigidizing effect. Rapid accumulation of wax and cutin in the CMs after bud burst followed by the mechanical supports of cutan and polysaccharide in an isolateral manner contributed to the remarkable environmental tolerance of S. alba.

    DOI: 10.1111/j.1365-3040.2012.02482.x

  • Mechanical properties of fruit-cuticular membranes isolated from 27 cultivars of Diospyros kaki Thunb.

    Shuntaro Tsubaki, Yoshihiko Ozaki, Keizo Yonemori, Jun-ichi Azuma

    FOOD CHEMISTRY   132 ( 4 )   2135 - 2139   2012.6

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    Fruit cuticular membranes (CMs) were isolated from 27 cultivars of Diospyros kaki Thunb., and relationships among their chemical compositions, densities and mechanical properties were analysed. Wide cultivar dependency was observed in both chemical compositions and mechanical properties, however, astringency did not show clear correlation with them. Densities of the CMs showed significant positive correlation with maximum stress and elastic modulus, but negative correlation with maximum strain. Positive correlations were also observed in elastic modulus-polysaccharide content and maximum strain-polysaccharide content, and negative correlation in elastic modulus-cutin content on a weight over unit area (mu g/cm(2)) basis. The integration of densities of fruit CMs and their chemical constituents may explain the mechanical properties which are specific to each cultivar of D. kaki fruit. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodchem.2011.12.039

  • Improvement of microwave-assisted hydrolysis of cassava pulp and tapioca flour by addition of activated carbon

    Euis Hermiati, Jun-ichi Azuma, Shuntaro Tsubaki, Djumali Mangunwidjaja, Titi C. Sunarti, Ono Suparno, Bambang Prasetya

    CARBOHYDRATE POLYMERS   87 ( 1 )   939 - 942   2012.1

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    The superior effects of addition of activated carbon were evidenced for microwave assisted hydrolysis of starches in cassava pulp and tapioca flour under hydrothermal conditions varying irradiation temperature (160-230 degrees C at 5 min), duration of heating time (5-18 min at 210 degrees C) and amount of activated carbon at 0.5-2.0:1:20 of activated carbon:solid:liquid ratio. The presence of 1.0 g/g in microwave-assisted hydrolysis gave much improved glucose yields (44.49% for cassava pulp and 71.93% for tapioca flour) at lower heating temperature (220 degrees C and 200 degrees C, each for 5 min) with suppressed formation of secondary decomposed compounds than those without addition of activated carbon (32.41% in cassava pulp at 230 degrees C and 55.11% in tapioca flour at 240 degrees C, each for 5 min). The highest glucose yield from cassava pulp (52.27%) was obtained after heating at 210 degrees C for 15 min. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbpol.2011.08.033

  • Chemical and mechanical properties of cuticular membranes isolated from leaves of Sonneratia alba Reviewed International journal

    Yuki Takahashi, Shuntaro Tsubaki, Masahiro Sakamoto, Shin Watanabe, Wahyu Dwianto, Jun-ichi Azuma

    Wood Research Journal   2 ( 1 )   69 - 72   2011.6

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    DOI: 10.51850/wrj.2011.2.1.69-72

  • A novel saccharification method of starch using microwave irradiation with addition of activated carbon

    Akikazu Matsumoto, Shuntaro Tsubaki, Masahiro Sakamoto, Jun-ichi Azuma

    BIORESOURCE TECHNOLOGY   102 ( 4 )   3985 - 3988   2011.2

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    Activated carbons were investigated for their heat catalytic effects to improve saccharification of starch by autohydrolysis in water under microwave electromagnetic field, and the results were compared with graphite and carbon nanotubes. The activated carbons with low adsorptive capacity of maltose showed high saccharification rate, while those with high adsorptive capacity exhibited low saccharification. In addition, the former activated carbons decreased the saccharification temperature by 10-30 degrees C. Maltooligosaccharides produced in the presence of the latter activated carbons were recovered by desorption with 50% aqueous ethanol. The results indicated that both adsorptive capacities of maltooligosaccharides and catalytic effects of hot spots arisen from the uneven surface structure of activated carbons might contribute to the improvement in starch saccharification. (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biortech.2010.12.013

  • Microwave-assisted extraction of phenolic compounds from tea residues under autohydrolytic conditions

    Shuntaro Tsubaki, Masahiro Sakamoto, Jun-ichi Azuma

    FOOD CHEMISTRY   123 ( 4 )   1255 - 1258   2010.12

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    Phenolic compounds were extracted from three kinds of tea residues (green, oolong and black tea residues) by microwave-assisted extraction in water under autohydrolytic conditions without using any catalyst or organic solvent. Productions of phenolic compounds were enhanced by microwave heating at 230 C. The main phenolic constituent in the extract from green tea residue was pyrogallol (24.6%) which was estimated to be originated from degradations of catechins. Derivatives of guaiacyl units of lignin such as dihydroconiferyl alcohol (10.3%) and vanillin (8.1%) were, however, the main constituents in oolong tea residue. In the case of black tea residue, derivatives of both catechins and lignin were comparably extracted. These phenolic compounds are interesting as a bio-based chemical feedstock such as phenolic precursors and antioxidants. (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodchem.2010.05.088

  • Isolation of hesperidin from peels of thinned Citrus unshiu fruits by microwave-assisted extraction

    Tsuyoshi Inoue, Shuntaro Tsubaki, Kazunori Ogawa, Kiyotaka Onishi, Jun-ichi Azuma

    FOOD CHEMISTRY   123 ( 2 )   542 - 547   2010.11

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    Simultaneous extraction by microwave-irradiation and crystallisation were performed in the same pot of solvent of 70% (v/v) aqueous ethanol for isolation of hesperidin from thinned immature fruit peels of Citrus unshiu as refining of Citrus waste biomass. The hesperidin content in immature fruits peels was about 3.2-fold higher than that of mature fruit. After microwave-assisted extraction (MAE), the yield of hesperidin reached 58.6 mg/g, which was comparable to the amount obtained after extraction using DMSO:methanol (1:1, v/v) as a solvent for 30 min at room temperature. Heating temperature and time for isolation of hesperidin crystallites were optimised as 140 degrees C and 8 min by using response surface methodology. Under this optimal condition, 86.8% (47.7 mg/g) of total hesperidin was isolable by MAE and low-temperature storage (5 degrees C, 24 h). (c) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodchem.2010.04.051

  • Optimization of microwave-assisted extraction of carbohydrates from industrial waste of corn starch production using response surface methodology

    Tomoki Yoshida, Shuntaro Tsubaki, Yoshikuni Teramoto, Jun-ichi Azuma

    BIORESOURCE TECHNOLOGY   101 ( 20 )   7820 - 7826   2010.10

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    Microwave-assisted extraction (MAE) was applied for production of carbohydrates mainly consisting of arabinoxylan from corn pericarp which is an industrial waste of corn starch production by using hot compressed water as a solvent. The solubilization rate increased with increase in heating temperature and reached 75.2% at 220 degrees C. The main extracted materials were carbohydrates consist of glucose, xylose and arabinose indicating solubilization of starch and hemicellulose, while residues were composed of cellulose. Four independent variables (heating temperature, come-up time, heating time and solid to liquid ratio) were optimized for maximizing the carbohydrates yield using the response surface methodology including fractional factorial design, the path of steepest ascent and central composite design. The optimized condition was as follows; heating temperature 176.5 degrees C, come-up time 2 min, heating time 16 min and solid to liquid ratio 1/20 (g/mL), respectively. The maximal yield attained 70.8% of carbohydrates with predominant production of xylo-oligosaccharides. (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biortech.2010.05.011

  • Characterization of cuticle layer of Ilex latifolia Reviewed International journal

    Jun-ichi Azuma, Shuntaro Tsubaki, Rike Yudianti and Myrtha Karina

    Wood Research Journal   1   56 - 63   2010.6

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    DOI: 10.51850/wrj.2010.1.1.56-63

  • Microwave-Assisted Autohydrolysis of Prunus mume Stone for Extraction of Polysaccharides and Phenolic Compounds

    S. Tsubaki, Y. Ozaki, J. Azuma

    JOURNAL OF FOOD SCIENCE   75 ( 2 )   C152 - C159   2010.3

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    Stone of Prunus mume (P. mume) is a by-product of pickled P. mume industry. Stones of native and pickled P. mume, mainly composed of holocellulose (83.8 +/- 1.8% and 65.1 +/- 0.3%, respectively) and acid-insoluble lignin (25.3 +/- 2.2% and 30.6 +/- 0.9%, respectively), were autohydrolyzed by microwave heating to extract polysaccharides and phenolic compounds. By heating at 200 to 230 degrees C, 48.0% to 60.8% of polysaccharide and 84.1% to 97.9% of phenolic compound were extracted in water along with partial degradation of hemicelluloses and lignin. The extracted liquors showed antioxidant activity against hydroxyl radical and DPPH radical originated from phenolic compounds. The pickled P. mume stone showed higher autohydrolyzability and microwave absorption capacity than the native stone due to absorbed salts and acids during pickling in fruit juice of P. mume with external addition of sodium chloride. Pickling process in salty and weak acidic juice seemed to be a kind of pretreatment for softening the stones prior to autohydrolysis induced by microwave heating.

    DOI: 10.1111/j.1750-3841.2009.01466.x

  • Microwave Heating for Solubilization of Polysaccharide and Polyphenol from Soybean Residue (Okara)

    Shuntaro Tsubaki, Michiyo Nakauchi, Yoshihiko Ozaki, Jun-ichi Azuma

    FOOD SCIENCE AND TECHNOLOGY RESEARCH   15 ( 3 )   307 - 314   2009.5

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    Okara, a soybean by-product of tofu production, was treated with microwave irradiation in water for solubilization of its components. The solubilization rate increased with increasing temperature and reached higher than 70% around 200 degrees C with a heating time of 7 min. The main solubilized components were neutral carbohydrates consisting of arabinose and galactose, while the residues were mainly composed of cellulose. LV-SEM images confirmed solubilization of cell wall components. Production of new polyphenolic compounds that have antioxidant activity was observed above 180 degrees C. The heating temperature and heating time were optimized for neutral carbohydrate solubilization using the response surface methodology. The optimized condition was heating at 196 degrees C for 2 min, indicating that a short heating time is effective for solubilization of carbohydrates to prevent secondary decomposition.

    DOI: 10.3136/fstr.15.307

  • Microwave Heating of Tea Residue Yields Polysaccharides, Polyphenols, and Plant Biopolyester

    Shuntaro Tsubaki, Hiroyuki IIda, Masahiro Sakamoto, Jun-Ichi Azuma

    JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY   56 ( 23 )   11293 - 11299   2008.12

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    Microwave heating was used to produce aqueous-soluble components from green, oolong, and black tea residues. Heating at 200-230 degrees C for 2 min extracted 40-50% of polysaccharides and 60-70% of the polyphenols. Solubilization of arabinose and galactose by autohydrolysis occurred with heating above 170 degrees C, whereas heating above 200 degrees C was necessary to solubilize xylose. Catechins were soluble in water by heating at low temperature (110 degrees C); however, new polyphenols having strong antioxidant activity were produced above 200 degrees C. The amount of solubilized materials and antioxidant activity increased with increased fermentation of harvested tea leaves (green tea < oolong tea < black tea). Cutin, a plant biopolyester, remained in the residue after heating as did cellulose and lignin/tannin. The predominant cutin monomer that was recovered was 9,10-epoxy-18-hydroxyoctadecanoic acid, followed by dihydroxyhexadecanoic acid and 9,10,18-trihydroxyoctadecanoic acid.

    DOI: 10.1021/jf802253s

  • Microwave-assisted hydrolysis of biomass over activated carbon supported polyoxometalates Invited Reviewed International journal

    Tsubaki, S.; Oono, K.; Onda, A.; Ueda, T.; Mitani, T.; Hiraoka, M.

    RSC ADVANCES   7 ( 20 )   12346 - 12350   1900

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c6ra28778f

  • Examination of species delimitation of ambiguous DNA-based Ulva (Ulvophyceae, Chlorophyta) clades by culturing and hybridisation Invited Reviewed International journal

    Hiraoka, Masanori; Ichihara, Kensuke; Zhu, Wenrong; Shimada, Satoshi; Oka, Naohiro; Cui, Jianjun; Tsubaki, Shuntaro; He, Peimin

    PHYCOLOGIA   56 ( 5 )   517 - 532   1900

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    DOI: 10.2216/16-109.1

  • Microwave-assisted Hydrothermal Hydrolysis of Maltose with Addition of Microwave Absorbing Agents Invited Reviewed International journal

    Tsubaki, S.; Onda, A.; Yanagisawa, K.; Azuma, J.

    Procedia Chemistry   4   288 - 293   1900

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    DOI: 10.1016/j.proche.2012.06.040

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Books

  • Activation of chemical reactions on solid catalysts under microwave irradiation

    Yuji Wada, Satoshi Fujii, Shuntaro Tsubaki(Role:Joint author)

    Elsevier  2021.6 

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    Responsible for pages:In Nontraditional Activation Methods in Green and Sustainable Applications, Microwaves; Ultrasounds; Photo-, Electro- and Mechanochemistry and High Hydrostatic Pressure Advances in Green Chemistry   Language:English   Book type:Scholarly book

    DOI: 10.1016/B978-0-12-819009-8.00011-6

  • Microwave-assisted conversion of marine polysaccharides

    Shuntaro Tsubaki, Ayumu Onda, Tadaharu Ueda, Masanori Hiraoka, Satoshi Fujii, Yuji Wada(Role:Joint author)

    CRC Press  2019.6 

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    Responsible for pages:In Enzymatic Technologies for Marine Polysaccharides 1st Edition   Language:English   Book type:Scholarly book

  • Microwave-Driven Biorefinery for Utilization of Food and Agricultural Waste Biomass

    Shuntaro Tsubaki, Jun-ichi Azuma, Satoshi Fujii, Rawel Singh, Bhaskar Thallada, Yuji Wada(Role:Joint author)

    Elsevier  2018.6 

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    Responsible for pages:In Waste Biorefinery: Potential and Perspectives   Language:English   Book type:Scholarly book

    DOI: 10.1016/B978-0-444-63992-9.00013-6

  • マイクロ波を用いた藻類のバイオマス変換

    椿 俊太郎(Role:Joint author)

    R&D支援センター  2017.6 

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    Responsible for pages:マイクロ波加熱の基礎と産業応用   Language:Japanese   Book type:Scholarly book

  • Microwave-assisted hydrothermal processing of seaweed biomass, In Hydrothermal processing in biorefineries

    Shuntaro Tsubaki, Ayumu Onda, Tadaharu Ueda, Masanori Hiraoka Satoshi Fujii, Yuji Wada(Role:Joint author)

    Springer  2017.6 

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    Responsible for pages:Production of bioethanol and high added- value compounds of second and third generation biomass   Language:English   Book type:Scholarly book

    DOI: 10.1007/978-3-319-56457-9_19

  • Chemical Reactions on the Interfaces of solids under microwaves

    Yuji Wada, Dai Mochizuki, Taishi Ano, Masato M. Maitani, Shuntaro Tsubaki, Naoto Haneishi(Role:Joint author)

    De Gryuter  2017.6 

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    Responsible for pages:In Chemical Reactions on the Interfaces of solids under microwaves   Language:English   Book type:Scholarly book

    DOI: 10.1515/9783110479935-007

  • Microwave-assisted hydrothermal processing of seaweed biomass

    Shuntaro Tsubaki, Ayumu Onda, Tadaharu Ueda, Masanori Hiraoka Satoshi Fujii, Yuji Wada(Role:Joint author)

    Elsevier  2017.6 

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    Responsible for pages:In Hydrothermal processing in biorefineries – Production of bioethanol and high added- value compounds of second and third generation biomass   Language:English   Book type:Scholarly book

    DOI: 10.1007/978-3-319-56457-9_19

  • Microwave-assisted water extraction of carbohydrates from unutilized biomass

    Shuntaro Tsubaki, Ayumu Onda, Masanori Hiraoka, Satoshi Fujii, Jun-ichi Azuma, Yuji Wada(Role:Joint author)

    Elsevier  2017.6 

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    Responsible for pages:In Water Extraction of Bioactive Compounds   Language:English   Book type:Scholarly book

    DOI: 10.1016/B978-0-12-809380-1.00007-3

  • Production and conversion of green macroalgae (Ulva spp.)

    Shuntaro Tsubaki, Masanori Hiraoka(Role:Joint author)

    Wiley  2017.6 

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    Responsible for pages:In Fuels, Chemicals and Materials from the Oceans and Aquatic Sources   Language:English   Book type:Scholarly book

    DOI: 10.1002/9781119117193.ch2

  • Microwave-induced biomass fractionation

    Shuntaro Tsubaki, Jun-ichi Azuma, Takeo Yoshimura, Masato Maitani,Eiichi Suzuki, Satoshi Fujii, Yuji Wada(Role:Joint author)

    Elsevier  2016.6 

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    Responsible for pages:pp. 103-126   Language:English   Book type:General book, introductory book for general audience

    DOI: 10.1016/B978-0-12-802323-5.00005-0

  • Algal Biomass Conversion under Microwave Irradiation

    Shuntaro Tsubaki, Ayumu Onda, Tadaharu Ueda(Role:Joint author)

    Wiley-VCH  2015.10 

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    Responsible for pages:In Microwaves in Catalysis: Methodology and Applications, pp. 303-321,   Language:English   Book type:Scholarly book

    DOI: 10.1002/9783527688111.ch15

  • 最新マイクロ波エネルギーと応用技術 第6章 2.2.5.食品系バイオマス、第6章 2.2.6 海洋系バイオマス

    椿 俊太郎(Role:Joint author)

    (株)産業技術サービスセンター  2014.6 

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    Responsible for pages:pp. 717-720, 721-725   Language:Japanese   Book type:Scholarly book

  • Application of microwave technology for utilization of recalcitrant biomass

    Shuntaro Tsubaki, Jun-ichi Azuma(Role:Joint author)

    I-Tech Education and Publishing  2011.6 

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    Responsible for pages:pp.697-722   Language:English   Book type:Scholarly book

    DOI: 10.5772/14040

  • Application of microwave heating for the utilization of agricultural biomass

    Shuntaro Tsubaki, Masahiro Sakamoto and Jun-ichi Azuma(Role:Joint author)

    Global Research Network  2009.6 

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    Responsible for pages:In Research Advances in Agricultural and Food Chemistry   Language:English   Book type:Scholarly book

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Presentations

  • Approaches to the Theory and Applications of Microwave-Controlled Chemical Reactions Invited International conference

    @Shuntaro Tsubaki

    IMPI57 Symposium  2023.6 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Denver, Colorado, USA   Country:United States  

  • The Microwave-controlled Catalytic Reactions: Its Theory and Application Invited International conference

    Shuntaro Tsubaki

    The 4th Global Congress on Microwave Energy Applications  2022.8 

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    Event date: 2022.8 - 2023.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:China  

  • 有限要素法を用いたバイオマスの触媒的熱分解のための空間電力合成電磁界の解析

    #本田 梨恵, @椿 俊太郎, 藤井 知, @井倉 則之

    日本化学会第104春季年会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本大学理工学部 船橋キャンパス   Country:Japan  

  • 強電磁場ミリ波リアクターと合金触媒を用いた触媒的バイオマス熱分解反応の加速

    @椿 俊太郎, 古川 森也, 藤井 知, 丹羽 尉博, 田 旺帝

    日本化学会第104春季年会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本大学理工学部 船橋キャンパス   Country:Japan  

  • Microwave-assisted selective heating of W/O emulsions and its application to microreactor for enzymatic reaction

    @Haque Md Azizul, #竹下 奈津美, @椿 俊太郎, @杉山 武晴, @井倉 則之

    日本化学会第104春季年会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本大学理工学部 船橋キャンパス   Country:Japan  

  • マイクロ波によるポリエチレンイミンの選択加熱によるCO2 脱離の加速

    #原 理佳子, @椿 俊太郎, 山田 秀尚, @井倉 則之

    日本化学会第104春季年会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本大学理工学部 船橋キャンパス   Country:Japan  

  • マイクロ波による触媒反応制御 Invited

    @椿 俊太郎

    JACI-20240207環境技術部会講演会   2024.2 

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    Event date: 2024.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:On line   Country:Japan  

  • 精密制御マイクロ波を用いたフードテック Invited

    @椿 俊太郎

    第36回CES21講演会「食品分野 × 化学工学の新展開 -単位操作からスマートシステムまで- 」 – 化学工学会関西支部  2024.1 

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    Event date: 2024.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪公立大学文化交流センター   Country:Japan  

  • マイクロ波による局所高温場形成のその場観察 Invited

    @椿 俊太郎

    日本表面真空学会 東北・北海道支部 関東支部 合同セミナー  2024.1 

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    Event date: 2024.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

  • マイクロ波を用いた触媒の局所温度制御 Invited

    @椿 俊太郎

    石油学会中国・四国支部 第41回支部講演会 & 第12回次世代天然ガス利用を考える若手勉強会 ジョイントシンポジウム  2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:On line   Country:Japan  

  • κ-カラギーナンによる内水相のゲル化が濃厚W/O/W エマルションの物性に及ぼす影響

    #渡邉 希実, @椿 俊太郎, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • 誘電加熱によるBacillus subtilis 芽胞の効率的殺菌

    #伊原 さとみ, @椿 俊太郎, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • 未利用海藻資源を用いた硫酸化多糖の高速マイクロ波抽出

    #松嵜 一真, @椿 俊太郎, @杉山 武晴, @巽 大輔, 平岡 雅規, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • マイクロ波によるW/O エマルション系の加熱特性

    #竹下 奈津美, @椿 俊太郎, @杉山 武晴, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • マイクロ波を利用したエマルション含有タンパク質ゲルの特性に関する研究

    #井手 綺音, @椿 俊太郎, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • ペクチンによるO/Wエマルションの界面状態が香気成分放出に及ぼす影響

    #竹下 楓見子, @椿 俊太郎, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • 乳タンパク質を用いたW/O/W エマルションの調製に関する研究

    #安藤 翔, #木村 優紀, @椿 俊太郎, 越膳 浩, @井倉 則之

    日本食品科学工学会 西日本支部大会  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学西新プラザ   Country:Japan  

  • Na-ZSM-5を用いたマイクロ波による脂質の接触分解反応の加速, およびin situ XRD観測

    #大田 駿介, @椿 俊太郎, @永長 久寛, 福島 潤, 君島 堅一, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • マイクロ波によるW/Oエマルションの局所温度評価

    #竹下 奈津美, @椿 俊太郎, @杉山 武晴, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 芽胞形成細菌に対する誘電加熱の殺菌効果および発芽促進効果

    #伊原 さとみ, @椿 俊太郎, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 高周波およびマイクロ波によるミナミアオノリ (Ulva meridionalis)由来硫酸化多糖の高効率抽出

    #松嵜 一真, @椿 俊太郎, @杉山 武晴, @平岡 雅規, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • Sterilization of Bacillus Subtilis by anatase TiO2 catalyst under microwave

    #Sum Chiva , #伊原 さとみ, @椿 俊太郎, @永長 久寛, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 発芽誘導とマイクロ波を併用した耐熱性芽胞殺菌プロセスの開発

    #村上 誠太, #伊原 さとみ, #岡林 美宇, @椿 俊太郎, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 精密制御高周波を利用した凍結乾燥の高速化と乾燥状態モニタリング

    #神川 葉, 仲田 眞惟, 渡邉 宰子, 飯田 湧也, 保谷野 つく し, @椿 俊太郎, 米持 悦生, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • ZnOナノワイヤ触媒によるマイクロ波増強および生体触媒反応加速

    #大庭 竜空, @椿 俊太郎, 細見 拓郎, 柳田 剛, @永長 久寛, @井倉 則之

    第17回日本電磁波エネルギー応用学会シンポジウム  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • How to obtain good XAFS spectrum under microwave heating? In situ and operando spectroscopy for understanding microwave material interaction Invited International conference

    @Shuntaro Tsubaki

    IMPI, Fall Webinar Series, Part I: Understanding Microwave Material Interaction  2023.5 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:On line   Country:Japan  

  • Microwave and radiofrequency-assisted extraction of sulfated polysaccharides from Ulva seaweed International conference

    #Kazuma Matsuzaki, @Shuntaro Tsubaki, @Takeharu Sugiyama, Masanori Hiraoka, @Noriyuki Igura

    19th international conference on Microwave and Hight-Frequency Applications(AMPERE2023)  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Cardiff University   Country:Japan  

  • In situ analysis of microwave-boosted catalytic pyrolysis of lignocellulosic biomass International conference

    @Shuntaro Tsubaki, Jun Fukushima, Masateru Nishioka, @Hisahiro Einaga, @Takeharu Sugiyama, Wang-Jae Chun, Ken-ichi Kimijima, Masao Kimura, Yuji Wada, Makoto Yasuda

    19th international conference on Microwave and Hight-Frequency Applications(AMPERE2023)  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Cardiff University   Country:Japan  

  • Impact of polysaccharide matrices on flavour release behaviour from oil in water emulsion

    #Wu SiYuan ,#竹下 楓見子,@椿 俊太郎,@井倉 則之

    日本食品科学工学会 第70回記念大会  2023.8 

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    Event date: 2023.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都女子大学   Country:Japan  

  • マイクロ波による W/O エマルションの加熱挙動とその機構

    #竹下 奈津美, @椿 俊太郎, @杉山 武晴, @井倉 則之

    第36回若手研究講演会および第41回夏季セミナー  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:ホテルクラウンパレス北九州   Country:Japan  

  • Exotic Microwave Catalysis for Ultra-rapid Lignocellulose Conversion International conference

    @Shuntaro Tsubaki

    Taiwan-Japan Symposium on Reaction Control (TJSReC)  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:国立陽明交通大学   Country:Taiwan, Province of China  

  • Fast catalytic pyrolysis of lignocellulose by tuned microwaves International conference

    Shuntaro Tsubaki, Noriko Ohara, Yuki Hamada, Jun Fukushima, Masateru Nishioka, Takeharu Sugiyama, Hisahiro Einaga, Wang-Jae Chun, Yuji Wada, Makoto Yasuda

    The 9th Tokyo Conference on Advanced Catalytic Science and Technology  2022.7 

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    Event date: 2023.7 - 2022.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:福岡   Country:Japan  

  • マイクロ波応答性ZnOナノワイヤ触媒によるグルコース転化の加速

    #大庭 竜空, @椿 俊太郎, 細見 拓郎, 柳田 剛, @永長 久寛, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • マイクロ波化学のサイエンス ~食品から触媒まで~ Invited

    @椿 俊太郎

    第60回 化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • Fundamental study of heterogeneous catalytic sterilization of Bacillus Subtilis by microwave selective heating

    #Sum Chiva, #伊原 さとみ, @椿 俊太郎, @永長 久寛, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • Effect of viscosity on aroma release from oil in water emulsion

    #Wu Si Yuan, #竹下 楓見子, @椿 俊太郎, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • マイクロ波によるW/Oエマルションの加熱挙動とその機構

    #竹下 奈津美, @椿 俊太郎, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 誘電加熱を用いた海藻由来多糖の高効率抽出

    #松嵜 一真, @椿 俊太郎, @井倉 則之, 平岡 雅規

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 誘電加熱を用いた芽胞形成細菌の発芽促進および殺菌

    #伊原 さとみ, @椿 俊太郎, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • マイクロ波を利用したエマルション含有タンパク質ゲルの開発に関する研究

    #井手 綺音, @椿 俊太郎, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 内水相の塩濃度が濃厚W/O/Wエマルションの流動特性に及ぼす影響

    #森 誠, @井倉 則之, @椿 俊太郎, #渡邉 希実

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • 精密誘電加熱による凍結乾燥の高速化と乾燥品の品質制御

    #神川 葉, 仲田 眞惟, 渡邉 宰子, 飯田 湧也, 保谷野 つくし, @椿 俊太郎, 米持 悦生, @井倉 則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • マイクロ波を用いた脂肪酸の接触分解反応の促進

    #大田駿介, @椿俊太郎, @永長久寛, @井倉則之

    第60回化学関連支部合同九州大会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • マイクロ波 in situ XRDによるリグノセルロースの触媒的熱分解加速機構の解明

    @椿俊太郎,#大田 駿介,@井倉 則之,中村 崇司,福島 潤,君島 堅一,木村 正雄,田 旺帝

    第12回 JACI / GSC シンポジウム  2023.6 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:一橋大学一橋講堂   Country:Japan  

  • マイクロ波の固体触媒局所加熱によるバイオマスの触媒的急速熱分解反応の加速

    椿俊太郎、福島潤、西岡将輝、永長久寛、杉山武晴、田旺帝、君島堅一、和田雄二、安田誠

    第131回触媒討論会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神奈川大学   Country:Japan  

  • 915MHzマイクロ波を用いたリン化金属ナノ粒子触媒による糖還元反応の促進

    椿 俊太郎, 山口 渉, 大田 駿介, 安田 誠, 水垣 共雄, 満留 敬人

    第18回バイオマス科学会議  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • マイクロ波によるミナミアオノリ(Ulva meridionalis)由来硫酸化多糖の高効率抽出

    松嵜 一真, 椿 俊太郎, 井倉 則之, 平岡 雅規

    第18回バイオマス科学会議  2022.11 

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    Event date: 2022.11

    Language:Japanese  

    Venue:前橋テルサ   Country:Japan  

  • マイクロ波駆動触媒反応-原理と応用- Invited

    椿 俊太郎

    石油学会 第47回九州・沖縄支部講演会  2022.10 

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 分散相および内水相の体積分率が濃厚W/O/Wエマルションの流動特性に及ぼす影響

    渡邉希実, 後藤太郎, 椿俊太郎, 井倉則之

    第59回化学関連支部合同九州大会  2022.7 

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    Event date: 2022.7

    Language:Japanese  

    Country:Japan  

  • O/Wエマルションの連続相・分散相粘度が香気成分放出に及ぼす影響

    竹下楓見子, 岩航平, 椿俊太郎, 井倉則之

    第59回化学関連支部合同九州大会  2022.7 

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    Event date: 2022.7

    Language:Japanese  

    Venue:北九州国際会議場   Country:Japan  

  • 大豆タンパク質添加がエマルションゲルの物性に及ぼす影響

    竹下奈津美, 坂元渚, 井倉則之, 椿俊太郎

    第59回化学関連支部合同九州大会  2022.7 

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    Event date: 2022.7

    Language:Japanese  

    Venue:北九州国際会議場   Country:Japan  

  • 風味が良好な高タンパク質乳原料の作製に関する研究

    安藤翔, 末次祐海, 椿俊太郎, 越膳浩, 井倉則之

    第59回化学関連支部合同九州大会  2022.7 

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    Event date: 2022.7

    Language:Japanese  

    Venue:北九州国際会議場   Country:Japan  

  • 香辛料抽出液を用いた芽胞形成細菌の効率的静菌および殺菌

    伊原さとみ, 井倉則之, 椿俊太郎, 岡林美宇

    第59回化学関連支部合同九州大会  2022.7 

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    Event date: 2022.7

    Language:Japanese  

    Venue:北九州国際会議場   Country:Japan  

  • Fast pyrolysis of lignocellulosic biomass using a frequency-auto-tracking solid-state microwave generator International conference

    Shuntaro Tsubaki, Yuki Nakasako, Masateru Nishioka, Noriko Ohara, Satoshi Fujii, Yuji Wada

    18th International Conference on Microwave and High Frequency Applications AMPERE 2021  2021.9 

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    Event date: 2022.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Sweden  

  • The microwave-induced local high temperature at Pt nanoparticles observed by in situ EXAFS International conference

    Shuntaro Tsubaki, Taishi Ano, Anyue Liu, Satoshi Fujii, Ken Motokura, Wang-Jae Chun, Yuji Wada

    Pacifichem 2021  2021.12 

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    Event date: 2021.6 - 2022.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • The controlled reaction by electromagnetic waves and its application to biomass refinery Invited International conference

    Shuntaro Tsubaki

    The 15th Japan Society of Electromagnetic Wave Energy Applications Symposium  2021.10 

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    Event date: 2021.6 - 2022.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  • Controlling chemical reaction by electromagnetic waves and its application to biomass utilization Invited International conference

    Shuntaro Tsubaki, Chun Wang Jae, Ken Motokura, Satoshi Fujii, Yuji Wada

    International Conference on Biotechnology for Sustainable Agriculture, Environment and Health (BSAEH-2021))  2021.4 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:India  

  • 915 MHzマイクロ波によるリン化ニッケル/ハイドロタルサイト触媒を 介したD-グルコースの高速水素化反応

    椿 俊太郎、山口 渉、安田 誠、水垣 共雄、満留 敬人

    第129回触媒討論会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • マイクロ波によるIn触媒を介した 1,3-ジカルボニル化合物へのアルキン付加反応の加速

    椿 俊太郎、濱田 由紀、水船 恭平、西本 能弘、安田 誠

    日本化学会第102春季年会(2022)  2021.3 

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    Event date: 2021.3 - 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • マイクロ波によるリグノセルロースの 触媒的急速熱分解の促進

    椿俊太郎 濱田由紀、小原則子、福島潤、西岡将輝、杉山武晴、 永長久寛、田旺帝、和田雄二、安田誠

    第17回バイオマス科学会議  2021.1 

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    Event date: 2021.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

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MISC

  • 電界集中型マイクロ波を用いた有機炭素資源の急速熱分解 Reviewed

    椿 俊太郎

    ペトロテック11月号   2024.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 精密制御型マイクロ波を用いた凍結乾燥技術

    椿 俊太郎, 神川 葉, 井倉 則之

    薬剤学: 生命とくすり   84 ( 3 )   167 - 170   2024.7   ISSN:0372-7629

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    Language:Japanese   Publisher:(公社)日本薬剤学会  

  • ミナミアオノリ由来“ウルバン”の生産と利用

    椿 俊太郎, 松嵜 一真, 井倉 則之, 平岡 雅規

    FFIジャーナル   2023.4

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: https://doi.org/10.34457/ffij.228.2_155

  • マイクロ波による固体触媒の局所高温制御—Control of local high temperature at the solid catalysts by microwaves Reviewed

    椿 俊太郎

    2023.1

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: http://ci.nii.ac.jp/ncid/AN10075706

  • マイクロ波による固体触媒の局所高温制御—Control of local high temperature at the solid catalysts by microwaves

    椿 俊太郎

    放射光 : 日本放射光学会誌 = Journal of the Japanese Society for Synchrotron Radiation Research / 日本放射光学会 編   36 ( 1 )   3 - 9   2023.1   ISSN:0914-9287

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    Language:Japanese   Publisher:日本放射光学会  

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  • マイクロ波による触媒反応制御 学理とその応用 Reviewed

    椿 俊太郎

    化学と生物   2022.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • マイクロ波による触媒反応制御 : 学理とその応用—Controlling the Catalytic Reaction by Microwaves : Theory and Applications Reviewed

    椿 俊太郎

    化学と生物   2022.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: http://ci.nii.ac.jp/ncid/AN00037573

  • マイクロ波化学研究の最前線

    和田雄二, 和田雄二, 間瀬暢之, 西岡将輝, 椿俊太郎

    エレクトロヒート   ( 242 )   2022   ISSN:0919-9721

  • マイクロ波照射下でのWO3触媒を介した 2-プロパノールの脱水反応の in situ / operando 観測 Reviewed

    樋口 智貴、松沢 智輝、椿 俊太郎、藤井 知、和田 雄二

    日本電磁波エネルギー応用学会論文誌   2020.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 金属酸化物に担持した金属ナノ粒子におけるマイクロ波発熱現象 Reviewed

    阿野大史、椿 俊太郎、劉 安越、田 旺帝、本倉 健、藤井 知、和田 雄二

    日本電磁波エネルギー応用学会論文誌   2020.11

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  • マイクロ波が触媒化学と工業技術に巻き起こすイノベーション—固体触媒層内に発生する特殊な非平衡局所加熱現象— Reviewed

    和田 雄二, 椿 俊太郎, 藤井 知, 羽石 直人, 阿野 大史

    触媒   2020.10

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 半導体式マイクロ波装置を用いたバイオマスの「超」急速熱分解 Reviewed

    椿 俊太郎、西岡 将輝、和田 雄二

    2020.9

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 電磁波照射効果を「見る」-「その場」観察を駆使した電磁波駆動化学の理解 Reviewed

    椿 俊太郎

    化学と工業   2020.3

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • マイクロ波駆動固体触媒反応の最前線 Reviewed

    椿 俊太郎

    触媒   2019.10

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 海藻バイオマスの効率的な利活用のための触媒変換技術 Reviewed

    恩田 歩武、椿 俊太郎、平岡 雅規

    触媒   2019.8

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 61巻,4号,pp. 215-221

  • マイクロ波を用いた固体触媒反応 Reviewed

    椿 俊太郎、和田 雄二

    化学工業   2019.6

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  • マイクロ波を用いた海藻バイオマスの変換技術 Reviewed

    椿 俊太郎

    化学工学   2018.3

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • Physical Insight to Microwave Special Effects– Nonequilibrium Local Heating and Acceleration of Electron Transfer Reviewed

    Yuji Wada, Shuntaro Tsubaki, Masato M. Maitani, Satoshi Fujii, Fuminao Kishimoto, Naoto Haneishi

    Journal of the Japan Petroleum Institute   2018.3

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  • マイクロ波を用いた藻類のバイオマス変換

    椿 俊太郎

    マイクロ波加熱の基礎と産業応用, R&D Support Center   2017.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • マイクロ波加熱を用いた植物由来の機能性物質のグリーンな抽出技術 Reviewed

    椿 俊太郎

    シーエムシー出版   2017.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • マイクロ波を用いた藻類バイオマス変換 Reviewed

    椿 俊太郎

    金属   2014.12

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Industrial property rights

Patent   Number of applications: 7   Number of registrations: 4
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • The Iron and Steel Institute of Japan

  • The Japanese Society for Food Science and Technology

  • American Chemical Society

  • Japan Society for Analytical Chemistry

  • The Chemical Society of Japan

  • 四国マイクロ波プロセス研究会

  • 日本木材学会

  • The Japan Institute of Energy

  • The Japanese Society of Carbohydrate Research

  • The Japanese Society of Phycology

  • The Society of Polymer Science, Japan

  • The Japan Society of Electromagnetic Wave Energy Applications

  • The Japan Society for Bioscience, Biotechnology, and Agrochemistry

  • The Catalysis Society of Japan

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Committee Memberships

  • 日本食品科学工学会西日本支部   Organizer   Domestic

    2024.5 - 2026.5   

  • 日本食品科学工学会西日本支部   庶務幹事   Domestic

    2024.5 - 2026.5   

  • 京都大学生存圏研究所   Steering committee member   Domestic

    2024.4 - 2025.3   

  • 京都大学生存圏研究所   附属生存圏未来開拓研究センター   Domestic

    2024.4 - 2025.3   

  • The 5th Global Congress on Microwave Energy Applications 2023 (5GCMEA 2024)   Steering committee member   Foreign country

    2022.12 - 2025.3   

  • The 5th Global Congress on Microwave Energy Applications 2023 (5GCMEA 2024)   Secretary   Foreign country

    2022.12 - 2025.3   

  • 京都大学生存圏研究所   Steering committee member   Domestic

    2022.4 - 2025.3   

  • 京都大学生存圏研究所   先進素材開発解析システム共同利用・共同研究専門委員会   Domestic

    2022.4 - 2025.3   

  • 日本農芸化学会   支部参与   Domestic

    2022.3 - 2025.2   

  • 日本学術振興会 産学協力委員会 電磁波励起反応場 R024委員会   Organizer   Domestic

    2020.4 - 2025.3   

  • 日本電磁波エネルギー応用学会   Executive   Domestic

    2018.5 - 2025.3   

  • 日本エネルギー学会   Organizer   Domestic

    2015.6 - 2025.3   

  • 日本エネルギー学会   バイオマス部会   Domestic

    2015.6 - 2025.3   

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Academic Activities

  • 若手WG長

    第6回JEMEA若手サマースクール~マイクロ波化学入門セミナー~  ( Japan ) 2023.8 - 2023.9

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    Type:Competition, symposium, etc. 

  • 運営委員

    JPIJS討論会 ~石油産業の役割と若手エンジニアの未来像~  ( Japan ) 2023.7

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:15

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:23

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 現地実行委員 International contribution

    The 9th Tokyo Conference on Advanced Catalytic Science and Technology(TOCAT-9)  ( Japan ) 2022.3 - 2022.7

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    Type:Competition, symposium, etc. 

  • 幹事

    第17回バイオマス科学会議 - 日本エネルギー学会  ( Japan ) 2022.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:26

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:5

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Technical Program Committee Members International contribution

    The 4th Global Congress on Microwave Energy Applications (4GCMEA 2022)  ( Chengdu (On-line) China ) 2021.8 - 2022.8

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    Type:Competition, symposium, etc. 

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Research Projects

  • ミリ波による「超温度場」形成と触媒反応制御

    2024.4 - 2026.3

    日本 

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    Authorship:Principal investigator 

    ミリ波を用いた新触媒反応の研究開発

  • ミリ波による「超温度場」形成と触媒反応制御

    Grant number:24H01001  2024

    Japan Society for the Promotion of Science・Ministry of Education, Culture, Sports, Science and Technology  Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 高周波によるプロトン移動制御、および有機廃棄物資源を電子源とした水素生成への応用

    2023.7 - 2025.3

    九州大学 

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    Authorship:Principal investigator 

    本研究では、高周波を用いてポリオキソメタレート(POM)触媒上のプロトン移動を自在に制御し、食品廃棄物など高含水有機炭素資源の効率的な酸化分解と水素の同時製造を達成する。まず、応募者の独自開発によるin situ XAFSなどの直接観測手法を駆使して高周波によるPOMの還元加速機構を明らかにする。続いて、POMに強電界を与える高周波装置を併用し、POMを介した触媒反応を制御する手法を確立する。本方法を用いて有機炭素資源を電子源として温和な条件でPOMを還元するとともに、さらに、生成したプロトン化POMからH2を回収する反応を開発する。

  • マイクロ波精密熱化学変換による有機廃棄物のケミカルリサイクル

    2023.6 - 2025.3

    公益財団法人 旭硝子財団 

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    Authorship:Principal investigator 

  • マイクロ波高精度殺菌による食品品質の強化とフードロス削減

    2023.6

    九州大学未来社会デザイン統括本部 

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    Authorship:Principal investigator 

    社会変革を先導する環境・食料リサーチコアの創出を目指したFS研究の実施

  • 空間電力合成マイクロ波加熱を利用した有機廃棄物の高速炭化システムの開発

    2023.4 - 2026.3

    独立行政法人環境再生保全機構 

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    Authorship:Principal investigator 

  • 空間電力合成マイクロ波加熱を利用した有機廃棄物の高速炭化システムの開発

    2023 - 2025

    環境問題対応型研究(ミディアムファンディング型)

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    Authorship:Principal investigator  Grant type:Contract research

  • 高周波によるプロトン移動制御、および有機廃棄物資源を電子源とした水素生成への応用

    Grant number:23K18546  2023 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Challenging Research(Exploratory)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • マイクロ波精密熱化学変換による有機廃棄物のケミカルリサイクル

    2023 - 2024

    公益財団法人 旭硝子財団2023年度研究奨励

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    Authorship:Principal investigator  Grant type:Contract research

  • マイクロ波高精度殺菌による食品品質の強化とフードロス削減

    2023

    九州大学未来社会デザイン統括本部 社会変革を先導する環境・食料リサーチコアの創出を目指したFS研究の実施

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    Authorship:Principal investigator  Grant type:On-campus funds, funds, etc.

  • マイクロ波増強電磁場による「超」高速バイオマス-炭素熱還元

    2022.4 - 2025.3

    九州大学 

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    Authorship:Principal investigator 

    従来の、バイオマスの急速熱分解や金属酸化物の炭素熱還元は活性化エネルギーが高く、エネルギー消費が著しい。本研究では、マイクロ波の精密制御により反応場に局所増強電磁場を印加し、バイオマスを炭素源とした金属酸化物の炭素熱還元の高速・低温化を実現する。本目的達成のため、具体的に下記3項目に取り組む。[①装置開発]半導体増幅器による革新的マイクロ波制御技術を用いた局所マイクロ波増強反応場の自在制御の実現。[②加速機構解明]独自開発したマイクロ波 in situ XRD、XAFS、Ramanなどの各種「その場」計測を駆使しした、マイクロ波の局所増強電磁場による反応加速の直接観測と、反応加速機構の解明。[③反応加速]高温固体化学反応を加速する反応設計指針の確立、および、マイクロ波増強電磁場形成によるバイオマスを炭素源とした、低炭素排出な金属酸化物の炭素熱還元反応の達成。

  • アグリバイオ×触媒 融合人材によるカーボンニュートラル資源循環拠点の形成

    2022 - 2027

    令和5年度大学改革活性化制度

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    Authorship:Principal investigator  Grant type:On-campus funds, funds, etc.

  • マイクロ波増強電磁場による「超」高速バイオマス-炭素熱還元

    Grant number:22H03779  2022 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • マイクロ波スイッチングを利用した化学吸収法による高効率二酸化炭素回収技術の開発

    2022 - 2023

    日本鉄鋼協会 鉄鋼カーボンニュートラル研究助成

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    Authorship:Principal investigator  Grant type:Contract research

  • マイクロ波スイッチングを利用した化学吸収法による 高効率二酸化炭素回収技術の開発

    2021.12 - 2023.3

    一般社団法人 日本鉄鋼協会 

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    Authorship:Principal investigator 

  • 精密周波数制御マイクロ波を用いたアミン吸収剤の再生による高効率CO2回収

    2021.9 - 2023.3

    九州大学 

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    Authorship:Principal investigator 

    本研究では、CO2を豊富に含むリッチ吸収剤に対し、最適な周波数のマイクロ波をアミン選択的に印加して局所的な高温状態を誘起し、CO2の脱離を促進する。周波数を精密に制御したマイクロ波装置を開発し、本装置によりCO2を含むリッチ吸収剤を高選択的に作用する最適周波数のマイクロ波を照射し、リッチ吸収剤を局所的に加熱する。反応に最適な周波数のマイクロ波を照射することにより、これまでにない低消費電力なマイクロ波化学プロセスが実現できると期待される。

  • 精密周波数制御マイクロ波を用いたアミン吸収剤の再生による高効率CO2回収

    Grant number:21K19859  2021 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Challenging Research(Exploratory)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 精密制御マイクロ波による「超」急速加熱を用いたバイオマスおよび二酸化炭素の高度利用技術

    2021

    松籟科学技術財団研究助成第38回研究助成

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    Authorship:Principal investigator  Grant type:Contract research

  • 高周波を用いた新バイオマスガス化法の開発

    2020

    稲盛財団 研究助成

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    Authorship:Principal investigator  Grant type:Contract research

  • 電磁波駆動触媒反応によるリグノセルロースの熱化学変換

    2019.9 - 2023.3

    九州大学 

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    Authorship:Principal investigator 

    本課題では電磁波の精密制御によって触媒反応を能動的に操る手法を確立し、リグノセルロースの温和な熱化学変換を実現する。具体的には以下の3項目に取り組む。(1) 触媒材料の誘電特性に基づく電磁波駆動触媒の開発、(2) 精密制御型電磁波反応装置の開発、(3) 「その場観察」による電磁波駆動反応の促進機構の理解と触媒反応制御手法の確立。

  • 電磁波駆動触媒反応によるリグノセルロースの熱化学変換

    2019 - 2022

    JST Strategic Basic Research Program (Ministry of Education, Culture, Sports, Science and Technology)

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    Authorship:Principal investigator  Grant type:Contract research

  • マイクロ波加熱を利用した未利用バイオマスの高速炭化システムの開発

    2018 - 2020

    環境研究総合推進費 革新型研究開発 (若手枠)

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    Authorship:Principal investigator  Grant type:Contract research

  • XAFS 測定によるマイクロ波照射下の金属担持触媒上の活性点の電子状態および構造のオペランド解析

    2018 - 2020

    物質構造科学研究所放射光共同利用実験

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    Authorship:Principal investigator  Grant type:Contract research

  • 高周波の印加による高含水有機性廃棄物の高効率酸化分解と水素の同時製造

    2018 - 2019

    村田学術振興財団 第34回(平成30年度)研究助成

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    Authorship:Principal investigator  Grant type:Contract research

  • マイクロ波誘起非平衡状態の学理とその固体・界面化学反応制御法への応用展開

    Grant number:17H06156  2017 - 2021

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 高周波電磁界の印加によるバイオマスの高効率電解酸化

    Grant number:17H05049  2017 - 2020

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists(A)or(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • ミリ波加熱を用いた流通式触媒反応系の開発、およびメタン転換反応への応用

    2017 - 2018

    みずほ学術振興財団第60回工学研究助成

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    Authorship:Principal investigator  Grant type:Contract research

  • ミナミアオノリを用いた迅速炭素固定化技術の開発と、13C標識化合物の生産への応用

    2016 - 2017

    研究成果展開事業マッチングプランナープログラム「企業ニーズ解決試験」

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    Grant type:Contract research

  • 次世代バイオマス資源の高選択的変換に有効に働く固体触媒の創製

    Grant number:15K14224  2015 - 2016

    Grants-in-Aid for Scientific Research  Grant-in-Aid for challenging Exploratory Research

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • マイクロ波により活性化される新規固体酸触媒の開発、およびバイオマス変換への応用

    Grant number:15K18814  2015 - 2016

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists(A)or(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • レクチンを高濃度に含有する海藻類「緑藻ミル」の高速大量培養技術の開発

    2015 - 2016

    研究成果展開事業 マッチングプランナープログラム探索試験

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    Grant type:Contract research

  • プロトンリレーを利用したマイクロ波活性化型固体触媒の開発と、糖質バイオマスの加水分解への応用

    2015

    国際科学技術財団研究助成金

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    Authorship:Principal investigator  Grant type:Contract research

  • 未利用バイオマスを原料とした新規バイオディーゼル燃料製造方法の開発

    2012 - 2013

    2012年度 住友財団環境研究助成

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    Authorship:Principal investigator  Grant type:Contract research

  • 新規マイクロ波高活性化固体触媒の開発と、海藻バイオマスからのラムノース製造への応用

    2012 - 2013

    研究成果最適展開支援プログラム(A-STEP)探索タイプ

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    Authorship:Principal investigator  Grant type:Contract research

  • マイクロ波加熱を用いた、緑茶飲料抽出残渣からの脂肪酸ポリエステルの高効率な単離方法の開発

    2010 - 2011

    東和食品研究振興会平成22年度学術奨励金

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    Authorship:Principal investigator  Grant type:Contract research

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Educational Activities

  • <Research Activities>
    ・Catalytic conversion of carbohydrates, extraction of functional molecules, and freeze-drying acceleration technology using precisely controlled microwave heating.
    ・Elucidation of the mechanism of microwave-induced reaction acceleration by "in-situ" observation using XAFS and Raman spectroscopy.
    ・Development of new microwave chemical processes based on microwave chemistry theory.

    <Educational Activities>
    ・Lectures of "Laboratory Work of Food Manufacturing Machinery," "Laboratory Course of Physical Chemistry," "Unit Operations," and "Food Technology and Machinery".
    ・Teaching knowledge and experimental methods related to chemical engineering and machinery required for food production.

Class subject

  • 食品製造機械学

    2024.10 - 2024.12   Fall quarter

  • 単位操作

    2024.10 - 2024.12   Fall quarter

  • 食品廃棄物処理学

    2023.12 - 2024.2   Winter quarter

  • 食料化学工学演習第一

    2023.10 - 2024.3   Second semester

  • 食品製造工学実験

    2023.10 - 2024.3   Second semester

  • 物理化学実験(食糧化学工学分野)

    2023.10 - 2024.3   Second semester

  • 食料化学工学演習第二

    2023.10 - 2024.3   Second semester

  • 食品製造機械学

    2023.10 - 2023.12   Fall quarter

  • 単位操作

    2023.10 - 2023.12   Fall quarter

  • 食料化学工学プロジェクト演習

    2023.4 - 2024.3   Full year

  • 食料化学工学特別研究第二

    2023.4 - 2024.3   Full year

  • 食料化学工学特別研究第一

    2023.4 - 2024.3   Full year

  • 食料化学工学ティーチング演習

    2023.4 - 2023.9   First semester

  • 食品廃棄物処理学

    2022.12 - 2023.2   Winter quarter

  • 食品製造工学実験

    2022.10 - 2023.3   Second semester

  • 食料化学工学演習第一

    2022.10 - 2023.3   Second semester

  • 食料化学工学演習第二

    2022.10 - 2023.3   Second semester

  • 物理化学実験(食糧化学工学分野)

    2022.10 - 2023.3   Second semester

  • 食品製造機械学

    2022.10 - 2022.12   Fall quarter

  • 単位操作

    2022.10 - 2022.12   Fall quarter

  • 食料化学工学特別研究第二

    2022.4 - 2023.3   Full year

  • 食料化学工学プロジェクト演習

    2022.4 - 2023.3   Full year

  • 食料化学工学特別研究第一

    2022.4 - 2023.3   Full year

  • 食料化学工学ティーチング演習

    2022.4 - 2022.9   First semester

  • 食品製造工学実験

    2021.10 - 2022.3   Second semester

  • 食料化学工学特別研究第二

    2021.10 - 2022.3   Second semester

  • 食料化学工学特別研究第一

    2021.10 - 2022.3   Second semester

  • 食料化学工学ティーチング演習

    2021.10 - 2022.3   Second semester

  • 食料化学工学演習第二

    2021.10 - 2022.3   Second semester

  • 食料化学工学演習第一

    2021.10 - 2022.3   Second semester

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FD Participation

  • 2023.9   Role:Participation   Title:令和5年度「九州大学安全の日」講演会

    Organizer:University-wide

  • 2023.3   Role:Participation   Title:全学FD:メンタルヘルス講演会

    Organizer:University-wide

  • 2023.3   Role:Participation   Title:TF(ティーチング・フェロー)経験を通じて大学院生の教育能力を高める

    Organizer:University-wide

  • 2023.3   Role:Participation   Title:全学FD「M2Bシステムの使い方」

    Organizer:University-wide

  • 2022.4   Role:Participation   Title:令和4年度 第1回全学FD(新任教員の研修)The 1st All-University FD (training for new faculty members) in FY2022

    Organizer:University-wide

  • 2022.3   Role:Participation   Title:新M2Bシステムの使い方 ~新機能を中心に紹介します~(3/14)

    Organizer:University-wide

  • 2022.3   Role:Participation   Title:農学研究院FD:リポジトリ登録を対象とした大学改革推進経費の新指標案について

    Organizer:[Undergraduate school/graduate school/graduate faculty]

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2023  大阪大学大学院工学系研究科応用化学専攻 招へい准教授  Classification:Affiliate faculty  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:2023年4月-2024年3月

  • 2022  大阪大学大学院工学系研究科応用化学専攻 招へい准教授  Classification:Affiliate faculty  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:2022年4月-2023年3月

  • 2021  大阪大学大学院工学系研究科応用化学専攻 招へい准教授  Classification:Affiliate faculty  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:2022年1月-12月

Outline of Social Contribution and International Cooperation activities

  • Director of Japan Society of Electromagnetic Wave Energy Applications, Secretary of JSPS R024 Committee on Electromagnetic-Wave-Excited Reaction Field, Secretary of The 5th Global Congress on Microwave Energy Applications 2024. Contribution to basic research and industrial application of microwave energy.

Social Activities

  • 電子レンジでフードロス・環境・エネルギー問題の解決に貢献

    福岡県立城南高等学校  2024.5

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

Media Coverage

  • 阪大など、マイクロ波照射で固体触媒の局所的加熱 メカニズム解明 Newspaper, magazine

    日刊工業新聞  2021.12

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    阪大など、マイクロ波照射で固体触媒の局所的加熱 メカニズム解明

Activities contributing to policy formation, academic promotion, etc.

  • 2023.12   文部科学省、科学技術振興機構

    令和6年度戦略目標の検討に関するワークショップ

Travel Abroad

  • 2024.6

    Staying countory name 1:United States   Staying institution name 1:デラウェア大学

  • 2023.9

    Staying countory name 1:Netherlands   Staying institution name 1:デルフト工科大

    Staying countory name 2:United Kingdom   Staying institution name 2:カーディフ大

    Staying countory name 3:Spain   Staying institution name 3:ヴィゴ大

  • 2023.7

    Staying countory name 1:Taiwan, Province of China   Staying institution name 1:国立陽明交通大学