Publisher：Carbon Letters  

Marine biomass (MB) is gaining attention as a sustainable and eco-friendly carbon source within the carbon cycle, particularly in regions with extensive coastlines. However, the high content of alkali and alkaline earth metals (AAEMs) in MB poses challenges in producing functional carbon materials, like activated carbon (AC), with a high specific surface area (SSA). In this study, we employed a two-step CO2 activation process, coupled with acid treatment, to successfully convert MB into highly porous AC. Preheating followed by nitric acid washing reduced AAEM content from 22.4 to 2.5 wt%, and subsequent atmospheric CO2 activation produced AC with an SSA of 1700 m2/g and mesopores of 3–5 nm. A further treatment with a mixed acid solution of nitric and acetic acids reduced impurities to below 1.0 wt%. A second pressurized CO2 activation at 1 MPa yielded AC with an SSA exceeding 2100 m2/g, with mesopores accounting for more than 50% of the total pore volume. This method demonstrates an effective approach to producing high-performance AC from MB for advanced applications.

DOI： 10.1007/s42823-024-00833-y

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of the American Chemical Society  

Xenon isotope nuclear magnetic resonance (129Xe-NMR) spectroscopy has been widely used to evaluate the pore structure of materials. However, determining how to apply this technique to investigate porous carbon materials is sometimes challenging, partly due to the structural disorder and heterogeneity of the surface properties of these materials, and partly due to the lack of reliable methods for controlling and assessing the density of adsorbed Xe. In this study, we designed and constructed a temperature- and pressure-controllable 129Xe-NMR system to evaluate the interaction between activated carbon (AC) and adsorbed Xe molecules. Based on a confirmation of surface-covering adsorption form of Xe molecules in AC pores, the extrapolation to the ordinate in plots of the surface area-normalized Xe adsorption amount (ρXe) and measured 129Xe-NMR chemical shifts of adsorbed Xe molecules, δ(Xe), to remove the influence of the Xe-Xe interaction allowed us to estimate the interaction between the AC pore surface and a single Xe molecule. These data confirmed that interactions between the pore surface and adsorbed Xe molecules depend on a parameter related to the AC pore size, regardless of the content of oxygen-containing surface functional groups, and an empirical equation to estimate the average pore size of ACs from the 129Xe-NMR results was proposed. Downward deviations of the linear correlation between ρXe and δ(Xe) were attributed to the influence of paramagnetism presumably derived from oxygen-containing functional groups on the surfaces of ACs and to changes in the adsorption form in low- and high-ρXe regions, respectively. These findings confirm the suitability of 129Xe NMR for pore size determination in porous carbon materials.

DOI： 10.1021/jacs.4c10099

DOI： 10.1021/jacs.4c10099

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Other Link： https://pubs.acs.org/doi/full/10.1021/jacs.4c10099

Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Communications in Heat and Mass Transfer  

Adsorption heat pumps (AHPs) have been envisioned to be the next generation of cooling systems owing to their low electricity consumption and negligible total equivalent warming impact (TEWI). This study investigated the adsorption characteristics, thermodynamic properties, and environmental impact of HFC32 onto six waste mangrove-derived activated carbons (MACs), which were synthesized at various operating conditions. Adsorption isotherms were acquired below and above critical temperatures (30, 50, 70, and 90 °C) by a high-precision thermogravimetric analyzer (TGA). Notably, the most promising sample exhibited a remarkable HFC32 adsorption capacity (2.628 kgref per kgads), which is a benchmark for any HFC/AC pair to date. Six sets of isotherm data were fitted with well-established Dubinin-Astakhov (D–A) and Tóth equations, resulting in a notably high goodness of fit. The isosteric heat of adsorptions was also assessed and elucidated using the ideal Clausius-Clapeyron model and modified non-ideal models proposed by Rahman et al. and Chakrabarty et al. Furthermore, a comprehensive thermodynamic and ecological footprint analysis, including the specific cooling effect (SCE), coefficient of performance (COP), Clapeyron analysis, and total equivalent warming impact (TEWI) assessment, were conducted. The implementation of the aforementioned MAC/HFC pair can potentially achieve an SCE of 457 kJ kgads–1 for space cooling and approximately 25% reduction in CO2 emissions. Adsorption uptake, SCE, COP, and TEWI analyses collectively emphasize the significant potential of pairing MACs with HFC32 in designing an environmentally sustainable AHP.

DOI： 10.1016/j.icheatmasstransfer.2024.107828

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Carbon Letters  

This study involved the heterogenization of a binder pitch (BP) using a small amount of nanocarbon to improve physical properties of the resulting graphite electrode (GE). Heterogenization was carried out by adding 0.5–2.0 wt.% platelet carbon nanofiber (PCNF) or carbon black (CB) to a commercial BP. To evaluate the physical properties of the BPs, we designed a new model graphite electrode (MGE) using needle coke as a filler. The heterogenized binder pitch (HBP) with PCNF or CB clearly increased the coking value by 5–13 wt.% compared to that of the as-received BP. Especially, the model graphite electrodes prepared with HBPs containing 1.0 wt.% PCNF or CB showed significantly improved physical properties compared to the control MGE from the as-received BP. Although the model graphite electrodes prepared with HBPs showed similar properties, they had smaller pore sizes than the control. This indicates that heterogenization of the BP can effectively decrease the pore size in the MGE matrix. Correlating the average pore sizes with the physical properties of the model graphite electrodes showed that, for the same porosity, matrices formed by the HBP with a smaller average pore size can effectively improve the apparent density, tensile strength, and oxidation resistance of the model graphite electrodes.

DOI： 10.1007/s42823-024-00736-y

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

Petroleum residues are produced as by-products of petroleum refining. Recently, various effective non-fuel uses of petroleum residues have been considered toward a carbon-neutral society. Pyrolysis fuel oil (PFO) is one of the petroleum residues. Advanced utilization of PFO for future non-combustion applications is required. In this study, Mesophase pitch-based carbon fibers (MPCF) were successfully produced from PFO. Spinnable mesophase pitch (SMP), a precursor of MPCF, was prepared using PFO as a raw material through the pressurized heat treatment at 420°C-430 °C. PFO is from the naphtha catalytic cracking process for ethylene production and is mainly composed of 2–4 condensed polycyclic aromatic hydrocarbons (PAHs). The high temperature pressurized heat treatment could result in the PFO-derived SMPs with yield of 23.0 wt% and excellent spinnability. On the other hand, without pressurized heat treatment, the yield was 8.5 wt%. This indicates that pressurized heat treatment significantly contributed to the yield improvement. In addition, the preference for the conversion of PFO molecules into highly condensed PAHs via cata-condensation during pressurized heat treatment at 420°C-430 °C was observed, which may be the main reason for the high yield and excellent spinnability of the resulting SMPs. As a result, the obtained PFO-derived SMPs though the such high-temperature pressurized heat treatment provided the typical radial-random transversal textures and general mechanical performances of MPCF: The tensile strength and Young's modulus of the PFO-derived MPCF graphitized at 2400 °C showed high values of 1.9–2.7 GPa and 554–635 GPa, respectively.

DOI： 10.1016/j.carbon.2024.119160

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Language：English   Publisher：Korea Australia Rheology Journal  

Fiber-based commodities represent a substantial fraction of plastic waste, leading to environmental harm. Discarded sanitary masks and fishing equipment undergo degradation, generating microfiber plastics, thereby presenting a notable hazard to both human health and the ecosystem. In this study, mechanically strong and environmentally friendly nanocomposite fibers were prepared by dry-jet wet spinning. The all-biomass-based fibers comprised agar and cellulose nanocrystals (CNC) as the matrix and nanofiller, respectively, and were highly miscible in deionized water as a cosolvent. Based on rheological characterization, the optimal spinning concentration and temperature were set to 13% (w/v) and 95 °C, respectively. The dry-jet wet-spun agar-based fibers exhibited remarkable mechanical performance compared with previously reported agar-based materials. In particular, the 1 wt% CNC (with respect to the agar amount) simultaneously improved the Young’s modulus, strength, and toughness by 8.3, 4.8, and 16.4% (2.6 GPa, 93.5 MPa, and 7.8 MJ m−3), respectively, compared to those of the control agar fibers (2.4 GPa, 89.2 MPa, and 6.7 MJ m−3), overcoming the trade-off of stiffness-toughness for conventional nanocomposite systems. In addition, the agar/CNC nanocomposite fibers rapidly adsorbed Methylene blue within 90 min, which is significantly faster than that of the film-type agar adsorbent. Therefore, all-biomass-based agar/CNC fibers are a promising remedy for alleviating water pollution.

DOI： 10.1007/s13367-024-00089-y

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.carbon.2024.118962

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Polymer Composites  

Fiber-based products constitute a significant portion of plastic waste and cause environmental damage. In particular, discarded sanitary masks and fishing gear disintegrate into microfiber plastics, posing a significant threat to human health and ecosystems. In this study, we developed robust biodegradable nanocomposite fibers of poly(butylene adipate-co-terephthalate) (PBAT)/cellulose nanocrystals (CNCs) (1 and 2 wt%) through dry-jet wet spinning, by using dimethyl sulfoxide (DMSO) as a common solvent. The control PBAT fibers exhibit remarkable mechanical performance with tensile strength and toughness of 160.0 MPa and 43.0 MJ m−3, respectively. CNC addition has a toughening effect with slightly reduced strength but enhanced toughness (148.8 MPa and 69.0 MJ m−3, respectively, for 2 wt% CNC); their mechanical performances are superior to those of previously reported PBAT-based materials. The remarkable performance of the fibers is attributed to a highly oriented structure with a total draw ratio of 15 after post-hot drawing. The control and nanocomposite fibers exhibit spot-like patterns in 2D wide-angle x-ray diffraction patterns with Herman's orientation factor of 0.54–0.58. The theoretical Hansen solubility parameter confirmed the poor chemical affinity between the PBAT and CNC. Nonetheless, the rheological characterization revealed that well-dispersed CNCs with DMSO produced a physical network in the PBAT matrix, resulting in the toughening effect. Such robust nanocomposite fibers consisting of fully biodegradable components are promising alternatives to nondegradable nylon and polyester fibers. Highlights: Robust biodegradable nanocomposite fibers of PBAT and CNC are prepared. Nanocomposite fibers are dry-jet wet spun using DMSO as a common solvent. PBAT fibers exhibit strength and toughness of 160.0 MPa and 43.0 MJ m−3. 2 wt% CNC toughens the PBAT fibers with an enhanced toughness of 69.0 MJ m−3. Rheological results confirm the toughening effect of well-dispersed CNC in PBAT.

DOI： 10.1002/pc.28379

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Other Link： https://zairyo.org/language/en/vol-9-no-2-2/

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Carbon Society of Japan  

<p>In the pursuit of carbon neutrality, marine biomass (MB) has emerged as a promising alternative to traditional carbon sources. This study endeavors to establish an economically viable pathway to derive porous carbon materials from MB. Simple pyrolysis of MB resulted in a MB-based carbon (MBC) characterized by a negligible open-pore structure. However, subsequent water washing transformed it into a porous material. N₂ adsorption tests revealed that the pyrolysis temperature and washing method substantially influenced the specific surface area (SSA) and pore volume of the MBC. While the catalytic activation function of elements inherent in MB, such as Na, Mg, K, Ca, and Cl, rendered MBC inherently porous, these elements also induced an initial pore-blocking effect that concealed the pores. Subsequent washing with water nearly eradicated Na, K, and Cl from MBC, making a number of the concealed pores accessible. Furthermore, a CO₂ aeration washing method effectively eliminated Mg and Ca elements from MBC, resulting in a substantial increase in SSA (>1000 m²/g) without the need for additional activation processes. Based on an understanding of the dual role of the elements naturally present in MB, this study demonstrates a potential strategy for environmentally friendly and cost-effective porous carbon production.</p>

DOI： 10.7209/carbon.030102

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Repository Public URL： https://hdl.handle.net/2324/7342382

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Carbon  

Pyrolysis of marine biomass (MB) to create marine biomass-derived carbon materials (MBCs) for industry is a sustainable solution. In this study, we systematically examined pyrolysis processes and performed elemental composition analyses of MB and MBC. The results revealed that MBC contained 12.5–25.5 mass% of alkali and
alkaline earth metals (AAEMs). As the pyrolysis temperature increased, some of these AAEMs underwent physical phase changes. Subsequently, we applied CO2 aeration washing for the first time or low-concentrated acetic acid washing to eliminate AAEMs from MBC, reducing potential hazards in the future industrial application.
Characterization results suggested that both post-processes effectively removed AAEMs from MBC, reducing the average content of Na and K to 0 mass%, Ca to 1.4 mass%, and Mg to 1.9 mass%. The Cl content was also reduced to 0.1 mass%. After removing AAEMs, the final carbon content of MBCs was as high as 90.8 mass% (dry
ash free basis) with a minimum ash content of 6.4 mass% (dry basis) according to ultimate analysis. Comparison with commercial coal products showed that carbon contents were superior and ash contents were lower than those of most coal samples, suggesting that the treated MBCs are of sufficient quality for the carbon cycle
industry.

DOI： 10.1016/j.carbon.2023.118570

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Other Link： https://authors.elsevier.com/a/1i0ca1zUAW0AN

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.carbon.2023.118395

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Carbon Society of Japan  

<p>The structure of carbon materials and their precursors can be studied by magic-angle spinning solid-state nuclear magnetic resonance (MAS-SS-NMR). The state and structure of adsorbed and/or intercalated molecules and ions on/in the carbon materials can also be determined using this method. Eddy currents induced by the magnetic field during measurements cause a temperature increase in conducting carbon materials. The effects of various physical and chemical characteristics of the carbon materials on this temperature increase were investigated. The oxygen content was found to be the dominant factor determing the temperature increase, with a higher oxygen content giving a smaller temperature increase. This correlation enables a rough estimate of the temperature increase in carbon materials prior to performing MAS-SS-NMR measurements.</p>

DOI： 10.7209/carbon.020304

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Repository Public URL： https://hdl.handle.net/2324/7331616

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

The progress of graphene-zipping reactions in graphene-based materials is successfully visualized using advanced temperature-programmed desorption (TPD) up to 2073 K.

DOI： 10.1039/d3sc02163g

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Language：English   Publisher：Chemical Papers  

In this research, carbon powder produced from bagasse, solid waste of sugarcane production, was used as raw material for creating screen-printed carbon electrode (SPCE), which is named SPAC600. Bagasse was carbonized at 600 °C under N2 flows to produce carbon. The carbonized bagasse was then treated with alkaline solution to leach out the impurities; therefore, the result, AC600, provides a significant increase in surface area from 24.8 to 197.10 m2 g−1. Alkaline treatment also changed the morphology of carbon powder into smaller flakes and removed C–H- aromatic vibration and C–O stretching within Fourier transformed- infrared (FTIR) spectra. The treatment also increases the electric conductivity from 10.01 S/cm to 25.39 S/cm. Alkaline leaching also increases the electrochemical performance of the electrode, proven by the significant increase of anodic current density, Ipa from 5.5 to 12.8 μA, for screen-printed carbon without alkaline leaching (SPC600) and SPAC600, respectively. Furthermore, ferrocene addition to the working electrode (WE) part of the prepared SPCE even increases the electrochemical performance as an analytic electrode, proven by the anodic current density of 173.0 μA. Even though the performance is still lower than a commercial SPCE which provides anodic current density up to 2000 μA, further treatment and modification may enhance the performance of the SPAC600.

DOI： 10.1007/s11696-023-02712-8

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Carbon Letters  

Mesophase pitch is a unique graphitizable material that has been used as an important precursor for highly graphitic carbon materials. In the current study, we propose to consider a spinnable mesophase pitch as a lyotropic liquid crystalline solution composed of solvent components and liquid crystalline components, so-called mesogen or mesogenic components. Among mesophase pitches, the supermesophase pitch is defined as a mesohpase pitch with 100% anisotropy, and can only be observed in pitches with a proportion of mesogenic components exceeding the threshold concentration (TC). We also examined the critical limit of AR synthetic pitch and 5 experimental spinnable mesophase pitches (SMPs). Then, we examined the effect of the solvent component on the minimum required amount of mesogenic component using a selected solvent component instead of their own solvent components. AR pitch showed 100% anisotropy with the least amount of its mesogenic component, THF insoluble components, of 60 wt.%. The solvent component, THF soluble components, extracted from AR-pitch, which has a molecular weight pattern similar to that of the original material but more amount of naphthenic alkyl chains, showed better solvent functionality than those of other THF solubles (THFSs) from other as-prepared spinnable mesophase pitches. This is why a lower amount of AR THFS can produce a supermesophase pitch when combined with the THFI (mesogenic components) of other experimental mesophase pitches. As a result of the current analysis, we define the mesogens as molecules that not only readily stack, but also maintain stacking structures in a fused state in the solution. The solvent component, on the other hand, is defined as molecules with a structure that readily decomposes in a fused state in the solution.

DOI： 10.1007/s42823-022-00453-4

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Language：English   Publisher：Journal of Industrial and Engineering Chemistry  

Spinnable mesophase pitch (SMP) is an important graphitizable precursor for high-performance carbon materials. Generally, SMPs show fully developed anisotropic texture, and the pitches contain isotropic contents more than 30 wt%, which plays the role of solvent for the mesogenic components in the lyotropic liquid crystalline system of the pitch. Here, we prepared SMP by blending the mesogenic components of AR mesophase pitch with various isotropic pitches to evaluate the usability of isotropic pitches as solvents. The mesogenic components were prepared by tetrahydrofuran fractionation of AR mesophase pitch. Isotropic pitches with a softening point of 140–220 °C were prepared separately by simple heat treatment of slurry oil (SO) and coal tar pitch (CTP). SMPs were prepared by thermal blending of the above mentioned mesogenic components and isotropic pitches in various blending ratios. CTP-derived isotropic pitch showed better solvent performance than a SO-derived pitch in terms of anisotropic texture. SMP prepared by blending of the mesogenic components and CTP-derived isotropic pitch with a softening point of 180 °C at the ratio of 4/6 (w/w) showed almost 100% anisotropic texture; the carbon fiber derived from the pitch showed tensile strength of 2.7 GPa and Young's modulus of 470 GPa after graphitization at 2,800 °C.

DOI： 10.1016/j.jiec.2022.12.039

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Language：English   Publisher：The Carbon Society of Japan  

<p>This review explores recent research regarding mesophase pitch (MP). Spinnable mesophase pitch (SMP) was used as a model pitch for MP in all experiments. We explain some phenomenological results of the lyotropic liquid crystalline properties of the SMP, which show that the MP behaves as a typical lyotropic liquid crystal. The mesogenic and solvent components of SMP are defined. We define the threshold concentration (TC) as the minimum amount of mesogenic component necessary for SMP to achieve 100 vol% anisotropy. We also report the TCs of various SMPs and discuss the effects of the solvent component. Concerning the identity of the mesogenic component, we discuss quantitative correlations between the size of the layered molecular stacking units and the anisotropic content of the SMP. Research has shown that a layered molecular stacking unit larger than a specific size corresponds to the mesogenic component of the MP. We discuss a novel method for the manufacture of SMPs using our understanding of MP as a lyotropic liquid crystal, which comprises thermal mixing of optimal amounts of the mesogenic and solvent components that were prepared separately under different conditions. This method enables the properties of each component to be optimized without involving a costly hydrogenation process. Finally, we discuss how this approach can be used to increase SMP yield by modifying the contents of the anisotropic mesogenic and solvent components.</p>

DOI： 10.7209/carbon.020105

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Japan Institute of Energy  

<p>The use of biomass is being considered as a means to achieve carbon neutrality, but little progress has been made in the use of marine biomass. One of the reasons is the high ash content. In this presentation, we report on the analysis results of organic and inorganic components of two large seaweeds, Undaria pinnatifida (Wakame) and luminaria (Kombu), using solid-state NMR and other analytical techniques in order to investigate the chemical form of ash components.</p>

DOI： 10.20550/jiesekitanronbun.59.0_74

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)   Publisher：The Japan Institute of Energy  

<p>As a new sustainable material resource, marine biomass (MB) is recently gathering attentions due to its high growing rate. Abundant hetero-elements contained in MB, however, would strongly influence on the pyrolytic behavior and thus physicochemical properties of the MB-based carbon materials (MBC). This study systematically investigated the pyrolysis characteristics and the facile hetero-elements removal method of MBC.</p>

DOI： 10.20550/jiesekitanronbun.59.0_76

CiNii Research

Language：English   Publisher：Heat Transfer Engineering  

Activated carbon signifies extensive carbonized materials of a high degree of porosity and has a wide range of applications. The porous and thermal properties of activated carbon (AC) are primarily dependent on the chosen raw material and synthesis conditions. In this article, the thermophysical properties of twelve waste biomass-derived AC samples are investigated and correlated. These AC samples are synthesized from mangrove and waste palm trunk. The samples are different in terms of carbonization temperature (500 and 600°C), activation temperature (600 to 900°C), and the mixing ratio (4 or 6) of the activation chemical, which is potassium hydroxide. The specific heat capacity of W-AC-C600-A900-K6 is found to have the lowest (0.843 to 1.14 kJ kg−1 K−1), and M-AC-C500-A900-K4 shows the highest (1.18 to 1.86 kJ kg−1 K−1) among the studied samples. Experimental data are fitted with the Green-Perry model with an error of less than 2%. This study also accounts for the comparison of specific heat capacity of studied samples and other adsorbents such as AC obtained from different precursors, silica gels, carbon-based consolidated composites, and metal-organic frameworks found in the literature. Moreover, this study gives the insight to synthesize high-quality AC from unknown biomass sources for a particular application.

DOI： 10.1080/01457632.2021.2001743

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Other Link： https://www.sciencedirect.com/science/article/pii/S0378775320312052

Language：English   Publisher：Carbon Letters  

A conventional porous carbon is still a very promising material for the removal of gaseous pollutants because of its abundant surface functional groups and a high specific surface area. Here, we prepared an environment-friendly uniform N-rich narrow micropore activated carbon, for the removal of formaldehyde, based on steam activation and N-rich with chitin as the starting material. A sample carbonized at 500 °C and steam activated at 800 °C (CAC800) showed a reasonable yield (55%) with uniform and narrow micropores without mesopores but having a balanced nitrogen functionality. CAC800 possesses outstanding formaldehyde removal capabilities under both dry and wet (humidity 45%) conditions. In addition, when compared with commercial activated carbon materials, we clearly demonstrated that the existence of high nitrogen content with uniform and narrow micropores simultaneously removed formaldehyde, effectively.

DOI： 10.1007/s42823-022-00379-x

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Other Link： https://www.sciencedirect.com/science/article/pii/S0378775320312052

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

The correlation of the anisotropic texture and (002) the molecular stacking property of spinnable mesophase pitch (SMP) was closely examined. SMP was found to be a specific solution consisting of mesogenic and solvent components, and the mesogenic component was composed of a cluster unit of (002) stacked molecular sheets. The anisotropic texture of SMP was strongly correlated with the height of (002) molecular stacking. When the concentration ratio of the mesogenic component to the solvent component was higher than the threshold concentration, the SMP always had 100 vol% anisotropic texture and a similar or larger number of stacked (002) sheets compared with its mesogenic component in both the solid and molten states. The solvent component, in both lamellar and hexagonal phases, assisted orientation of mesogenic molecules and rearrangement of mesogenic cluster units, thereby inducing a higher degree of graphitization than that of the solvent-free mesophase pitch. A schematic phase model of SMP was proposed based on a lyotropic liquid crystalline system and a hierarchical domain model.

DOI： 10.1016/j.carbon.2022.02.062

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Language：English   Publisher：Japan Society of Refrigerating and Air Conditioning Engineers  

<p>Water vapor adsorption on activated carbon (AC) for dehumidification purposes has gained much attention due to the abundance of benefits provided by AC. The working region limited in high water vapor relative pressure (<i>P/P0</i>) makes this material suitable only for removing water vapor at a highly humid region. In this study, ozone oxidation was conducted to introduce more oxygen-based functional groups on AC to attract more water molecules. Based on surface characterization results, ozone oxidation increases oxygen functional groups such as carboxylic on AC but decreases their pores. The more AC exposed to ozone, the more different properties could be observed. The increment of functional groups enhances the water vapor adsorption uptake at <i>P/P0</i> ≤ 0.6, shifting the water sorption into lower <i>P/P0</i>.</p>

DOI： 10.11322/tjsrae.21-36de_em_oa

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Bulletin of the Chemical Society of Japan  

Current greenhouse gas emissions suggest that keeping global temperature increase below 1.5 degrees, as espoused in the Paris Agreements will be challenging, and to do so, the achievement of carbon neutrality is of utmost importance. It is also clear that no single solution can meet the carbon neutral challenge, so it is essential for scientific research to cover a broad range of technologies and initiatives which will enable the realization of a carbon free energy system. This study details the broad, yet targeted research themes being pioneered within the International Institute for Carbon-Neutral Energy Research (I2CNER). These approaches include hydrogen materials, bio-mimetic catalysts, electrochemistry, thermal energy and absorption, carbon capture, storage and management and refrigerants. Here we outline the state of the art for this suite of technologies and detail how their deployment, alongside prudent energy policy implementation can engender a carbon neutral Japan by 2050. Recognizing that just as no single technological solution will engender carbon neutrality, no single nation can expect to achieve this goal alone. This study represents a recognition of conducive international policy agendas and is representative of interdisciplinary, international collaboration.

DOI： 10.1246/bcsj.20210323

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：RSC Advances  

Activated carbon is a suitable adsorbent for adsorption heat pumps (AHPs) with ethanol refrigerants. Although chemically activated carbon with highly developed pore structures exhibits good ethanol adsorption, the associated high production costs inhibit its practical application as an AHP adsorbent. Moreover, although physical activation can produce inexpensive activated carbon, the limited pore development limits the ethanol uptake. Recently, we developed a pressurized physical activation method that can produce activated carbon with a well-developed pore structure and characteristic pore size distribution. In this study, we investigated the applicability of the pressurized physically activated carbon as an adsorbent in activated carbon–ethanol AHP systems. Because of the large number of pressurization-induced pores of appropriate size, the pressurized physically activated carbon showed effective ethanol uptake comparable with that of chemically activated carbon on a weight basis. Furthermore, on a volume basis, the pressurized physically activated carbon, with a high bulk density, showed much higher effective ethanol uptake than chemically activated carbon. These results confirm the potential of the pressurized physically activated carbon as a relatively inexpensive high-performance adsorbent for AHP systems with ethanol refrigerants.

DOI： 10.1039/d1ra08395c

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DOI： 10.1016/j.ijrefrig.2021.08.012

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DOI： 10.1016/j.egyr.2021.09.003

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DOI： 10.1016/j.jiec.2021.07.014

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Activated carbon (AC) is produced by a physical or chemical activation process. Physical activation methods are commonly adopted in industry because of their low production costs, but the insufficiency of activating agent diffusibility into core parts of the particles and microdomains of carbon materials causes a lower activation yield and degree of pore development, compared with chemical activation methods. To increase the activating agent diffusibility and corresponding degree of pore development, we propose a novel pressurized physical activation method. Pressurization afforded remarkable increases in specific surface area and total pore volume of the prepared AC, compared with atmospheric pressure. Additionally, in AC prepared by this method, pore size distribution analysis revealed characteristic development of micropores of about 1.6 nm; such micropores did not appear in AC under conventional atmospheric physical activation. Furthermore, observations of particles and their microdomains showed that pressurization increased the activating agent diffusibility in carbon particles, but not at the microdomain level. This innovative pressurized physical activation can produce AC with highly developed pores (specific surface area >2600 m2/g) and a unique pore size distribution due to the improved activating agent diffusibility in carbon particles.

DOI： 10.1016/j.carbon.2021.07.061

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DOI： 10.1016/j.jiec.2021.06.013

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DOI： 10.1016/j.fuel.2021.120429

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DOI： 10.1016/j.carbon.2021.01.055

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DOI： 10.5109/4372285

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DOI： 10.3390/app11020678

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DOI： 10.1016/j.jpowsour.2020.228903

Other Link： https://www.sciencedirect.com/science/article/pii/S0378775320312052

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

Adsorption thermal energy storage plays a vital role in supporting the availability of renewable energy. Activated carbons produced from local waste biomass have been attracting considerable attention in adsorption technology due to their unique properties and sustainability. However, their limitation in water vapor uptake hinders the practical application of this material. In this work, acorn nutshells were utilized as a base material to produce activated carbon. Air oxidation was performed as a versatile and low-cost technique to enhance the material's properties and water adsorption capacity. By applying air oxidation as a post-treatment during material production, the amount of active functional groups and the water adsorption on activated carbon has been successfully enhanced. From the theoretical calculation, it is found that activated carbon–water working pairs shown promising performance to be used for adsorption thermal energy storage applications. The adsorption of water vapor on the post-treated-activated carbon releases the isosteric heat between 2400 kJ/kg to 2500 kJ/kg. Moreover, this study's working pair can be driven by a temperature of less than 50 °C. From the results, it is confirmed that by controlling the adsorbent's surface properties, activated carbon–water working pairs can be a promising way to provide alternative material and reduce the energy demand for driving the system.

DOI： 10.1016/j.egyr.2020.11.038

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

A new strategy incorporating three sequential treatments—selective molecular pre-masking, surface modification, and unmasking—is proposed for pore-size-dependent control of the surface properties of porous carbon materials. The method was experimentally validated using wide-pore-selective hydrophilization. n-Nonane was physically adsorbed for pre-masking, followed by room-temperature ozonation for surface modification. This process was used to introduce surface functional groups into wide pores, while leaving narrow pores intact. This study facilitates the development of new porous carbon materials with different surface properties that depend on pore size. This flexible strategy can be employed in conjunction with various molecular masking agents and surface-modification methods.

DOI： 10.1016/j.carbon.2020.07.050

Other Link： https://www.sciencedirect.com/science/article/abs/pii/S0008622320307107?via%3Dihub

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

Preparation of activated carbon from biomass residue with conventional steam activation was conducted to find the alternative raw materials for meeting the high demand for low-cost porous material in the desiccant application. In this study, activated carbons were produced from dead camphor leaves using two-step methods at different preparation temperatures. The characterization results revealed that the prepared activated carbons have a surface area of 700 m /g, with 75&#37; of microporosity. The water vapor sorption study reported that the water uptake of camphor leaf-based activated carbons was strongly affected by the pore properties of the materials. Moreover, from the water adsorption kinetics, it was observed that the rate constant of adsorption was varied at each relative pressure, which can be assumed that the water adsorption mechanism is different at each relative pressure. From these results, it was revealed that the prepared camphor leaf-based activated carbons have a promising ability to adsorb water vapor from humid air. 2

DOI： 10.1007/s42823-020-00204-3

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

Language：English  

DOI： 10.1021/acs.jpcc.0c02106

Language：English  

DOI： 10.1016/j.fuel.2020.117310

Language：English  

A research on the preparation of Carbon Waste Powder, CWP, was conducted and made from carbon rod waste which was extracted from used zinc-carbon batteries. This research was an effort to over-come environmental problem caused by battery waste by converting into adsorbent for methyl orange (MO) that frequently used by textile industries. The prepared powder was then analyzed to understand its characteristic peaks, crystallinity, and to compare the properties with other carbonaceous forms, i.e. a commercial Carbon Paper (CP), and a commercial meso- carbon micro-beads (MCMB). The analysis found that CWP is dominated by graphitic carbon. An adsorption experiment was then conducted to study their adsorption ability to methyl orange solution. The result found that those three carbona-ceous materials have the ability to adsorb methyl orange with different activities. MCMB has the high-est adsorption capacity of 0.197 mg.g^-1. Meanwhile, CWP and CP show adsorption capacity of 0.066 mg.g^-1 and 0.062 mg.g^-1, respectively. Methyl orange adsorption on CWP and CP were under second or-der, which means the adsorption could be four times faster as the MO solution doubled. Moreover, the rate constant of MO adsorption on CWP is 8×10^-4 min^-1, which was higher than the rate constant of MO adsorption on CP. It confirmed that the CWP can be used as a promising adsorbent for dye waste wa-ter.

DOI： 10.9767/bcrec.15.1.5148.66-73

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

To properly address the threat of global warming, there is an urgent need to reduce CO from the atmosphere through the development of environment-friendly technologies. Therefore, capturing/storage and utilization of CO as a refrigerant for adsorption cooling/heating technologies have been gaining momentum in the last decades. This study focuses on the development of novel activated carbons (ACs) with extremely large pore volume and high surface area from environment-friendly and abundantly available biomass precursor seeking higher CO adsorption capacity. Four AC samples are synthesized from the two biomass precursor's namely waste palm trunk (WPT) and mangrove (M) employing potassium hydroxide as an activating agent. The porous properties of the synthesized ACs are investigated from the N adsorption/desorption data. It is praiseworthy to elucidate that the highest surface area and pore volume for biomass-derived ACs (BACs) are obtained 2927 m g and 2.87 cm g , respectively. CO adsorption characteristics are investigated using a high precision magnetic suspension balance unit at five different temperatures ranging from 25 to 70 °C with various pressures. The WPT-AC (C500)/CO pair shows the highest adsorption uptake as high as 1.791 g g (excess adsorption) and 2.172 g g (absolute adsorption) at 25 °C and 5.04 MPa, which is superior to any other ACs reported to date. To the best of our knowledge, porous properties and adsorption uptake of CO reported in this study are the up-to-date benchmarks. The results show that novel BACs/CO pairs possess remarkably high adsorption performance, which will contribute towards the advancement of various adsorption-based technologies. 2 2 2 2 2 2 2 2 2 −1 3 −1 −1 −1

DOI： 10.1016/j.apenergy.2020.114720

Language：English  

DOI： 10.1021/acssuschemeng.9b07253

Language：English  

DOI： 10.1016/j.carbon.2019.11.082

Language：English  

DOI： 10.3390/polym12020328

Language：English  

DOI： 10.3390/app10010025

Language：English  

In this study, spinnable isotropic pitches (IPs) were produced by pyrolytic oils of biomass and polystyrene (PS) with ethylene bottom oil (EBO or pyrolysis fuel oil: PFO) through bromination/dehydrobromination reaction. To develop spinnable pitches, four different tars were produced and hybrid pitches were synthesized using different PFO blending ratios and bromine amounts. Results showed that PFO improves spinnability and pitch yield considerably. Furthermore, pitches with the same softening point (S.P.) were produced from different precursors and spinning, stabilization and carbonization were performed to produce general-performance carbon fiber (CF). In order to explain the structure-property relationship of the products, mechanical, morphological and chemical characterization were done by TOF-MS, elemental analysis, ¹³C-NMR and SEM-EDX. Thus, a comparison between the characteristics of CFs was made disregarding the S.P.s and more insight into the effect of EBO was gained. Mechanical properties of CFs found to be reasonable, considering typical tensile values of IP-based CFs.

DOI： 10.1016/j.jclepro.2019.118025

Language：English  

DOI： 10.1016/j.jiec.2019.07.036

Language：English  

DOI： 10.3390/polym11121911

Language：English  

DOI： 10.1021/acs.energyfuels.9b02692

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

We report on the in situ thermal measurement of a carbon nanofiber (CNF) modified by focused ion beam (FIB) irradiation. The FIB irradiation led to local amorphization of the crystalline structure of the CNF. The in situ measurement was improved by correcting for the effect of the scattered ions on the sensor. The low effective thermal conductivity of the pristine CNF (similar to 39 W/mK) resulted from the anisotropic structure made of many individual graphitic fibers. The first FIB irradiation decreased the thermal conductivity by approximately 3.2&#37;. This relatively small decrease is attributed to the structure of the CNF consisting of many individual fibers, with some fibers remaining pristine even after the FIB irradiation. Analysis using a thermal-circuit model suggested that the thermal transport in the CNF could include a ballistic feature of phonons in the micrometer range. Our proposed in situ thermal measurement method can be extended to the study of thermal transport in various structurally modified nanomaterials. (C) 2019 Published by Elsevier Ltd.

DOI： 10.1016/j.carbon.2019.07.056

Language：English  

DOI： 10.1246/cl.190230

Language：English  

DOI： 10.1021/acs.jpcc.9b04808

Language：English  

DOI： 10.1007/s42823-019-00027-x

Language：English  

DOI： 10.1627/jpi.62.61

Language：English  

DOI： 10.1007/s42823-019-00020-4

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DOI： 10.1007/s11696-018-0637-x

Language：English  

DOI： 10.1016/j.jssc.2019.01.025

Language：English  

DOI： 10.1007/s42452-018-0141-5

Language：English  

DOI： 10.1016/j.ijheatmasstransfer.2018.07.097

Language：English  

DOI： 10.2298/PAC1804342Z

Language：English  

DOI： 10.1016/j.jiec.2018.06.039

Language：English  

DOI： 10.1016/j.jiec.2018.07.008

Language：English  

In order to better understand the effects of composition and properties of atmospheric residues (AR) on their reactivities for hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodevanadium (HDV), hydrodenickel (HDNi), hydrodeasphaltene (HDAsp), and hydrodeconradson-carbon-residue (HDCCR) in the hydrotreating process, analysis and characterization of three ARs (AA-AR, AB-AR, and AM-AR) from Arabia crudes were conducted, and their hydrotreating reactivities were evaluated in a pilot unit over a catalyst system at 370 °C under a H₂ pressure of 13.5 MPa by comparing the conversions of the various species and their rate constants on each catalyst. The overall reactivity of various species decreases in the order of vanadium species > sulfur species ≈ asphaltenes > nickel species > Conradson carbon residue precursor > nitrogen species, regardless of the sources of the ARs. Reactivities of the three ARs in HDS, HDV, and HDAsp increase in the order of AB-AR < AA-AR < AM-AR, while reactivities of the three ARs in HDNi, HDCCR, and HDN are similar. The higher nitrogen and asphaltenes concentrations and larger density of AR have strong and negative effects on the HDS, HDV, and HDAsp reactivities but no significant effect on the HDN, HDNi, and HDCCR reactivities. The B parameter obtained from electron spin resonance analysis can be a good index to predict the HDV reactivity of AR.

DOI： 10.1021/acs.energyfuels.8b01150

Language：English  

DOI： 10.1021/acs.energyfuels.8b01150

Language：English  

DOI： 10.1016/j.jhazmat.2017.10.003

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

DOI： 10.1016/j.carbon.2017.08.024

Language：English  

DOI： 10.1039/c7ra06436e

Language：English  

DOI： 10.1021/acs.energyfuels.6b03275

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

Equilibrium adsorption uptake and kinetics of ethanol onto highly porous activated carbons (ACs) derived from two types of biomass namely waste palm trunk (WPT) and mangrove (M) have been experimentally measured at adsorption temperatures ranging from 30 to 70 °C for various evaporation pressures. A magnetic suspension adsorption measurement unit has been used for the experimental measurements. Four well-known adsorption isotherm models have been employed to fit the experimental data whilst two classical adsorption kinetics models i.e. Linear driving force (LDF) model and Fickian diffusion (FD) model are used to predict the experimental kinetics data. Among the four isotherm models Dubinin Astakhov (D-A), and Tóth equations agree well with the experimental uptake data for both ACs. The diffusion time constants are calculated at each adsorption temperature for WPT-AC/ethanol and M-AC/ethanol pairs. Moreover, activation energy and pre-exponential constant have been determined from the Arrhenius equation.

DOI： 10.1016/j.applthermaleng.2017.04.099

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

Biomasses are renewable resources and suitable precursors for synthesis of activated carbons (ACs). Two biomass sources: (i) Waste Palm Trunk (WPT) and (ii) Mangrove (M) are employed to synthesis activated carbons with huge surface area by chemical activation with potassium hydroxide (KOH). Thermophysical characteristics of the derived activated carbons namely thermal conductivity, particle size distribution, pore size distribution, surface area and pore volume are assessed. The total surface area of WPT-derived AC and mangrove-derived AC are found to be as high as 2927 m  g and 2924 m  g , respectively. The adsorption capacities of the synthesized biomass-derived ACs for ethanol are evaluated for assorted temperature and pressure conditions. It is observed that WPT-AC shows an ethanol uptake of 1.90 kg kg whilst the M-AC can adsorb up to 1.65 kg kg . The isosteric heat of adsorption associated with the present adsorbents/adsorbate (ACs/ethanol) calculated at different coverages showed only marginal difference. For a typical operating condition of adsorption heat pump, both biomass derived ACs showed similar net ethanol uptake which is significantly higher than the net uptake of commercially prevalent Maxsorb III AC. 2 −1 2 −1 −1 −1

DOI： 10.1016/j.ijheatmasstransfer.2017.02.081

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

DOI： 10.1016/j.carbon.2017.05.086

Language：English  

DOI： 10.1007/s10853-017-0754-x

Language：English  

DOI： 10.1021/acs.energyfuels.6b03279

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Activated carbons (ACs) prepared by chemical activation commonly show higher specific surface areas and higher yields than those prepared by physical activation. In this study, the differences in the pore development mechanisms between physical and chemical activation processes for AC preparation were studied from a structural point of view, based on the microdomain structure model. Phenol resin-based spherical carbon was used as the starting material. AC preparation via potassium hydroxide (KOH) activation (chemical activation) did not induce noticeable changes in the particle or microdomain sizes, despite the abundant development of pores. On the other hand, ACs produced via steam activation (physical activation) showed remarkable reductions in both particle and microdomain sizes, depending on the activation temperature. Considering the differences in activation yield and degree of developed porosity between chemical and physical activations, we concluded that, in the case of KOH activation, pore development homogeneously progressed overall for all microdomains consisting of carbon particles without apparent morphological change; however, steam activation caused inhomogeneous gasification from the outer surface of the carbon particles and microdomains. For this reason, KOH-ACs showed higher yield and superior pore development.

DOI： 10.1016/j.carbon.2016.11.082

Language：English  

DOI： 10.1016/j.cej.2016.11.096

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

DOI： 10.1063/1.4968250

Language：English  

DOI： 10.1016/j.electacta.2016.07.138

Language：English  

DOI： 10.1002/cphc.201600895

Language：English  

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DOI： 10.1016/j.electacta.2016.07.138

Language：English  

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DOI： 10.1016/j.carbon.2016.05.019

Language：English  

DOI： 10.1016/j.colsurfa.2016.05.044

Language：English  

DOI： 10.1016/j.carbon.2016.02.060

Language：English  

DOI： 10.1016/j.carbon.2015.12.082

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DOI： 10.1016/j.jiec.2015.11.026

Language：English  

DOI： 10.1039/C5RA20650B

Language：English  

DOI： 10.1016/j.jece.2016.01.012

Language：English  

DOI： 10.1016/j.carbon.2015.07.030

Language：English  

DOI： 10.1016/j.carbon.2015.09.003

Language：English  

DOI： 10.1016/j.seppur.2015.08.023

Language：English  

DOI： 10.1016/j.jcis.2014.12.093

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DOI： 10.1016/j.jhazmat.2015.01.066

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DOI： 10.1021/jp510630e

Language：English  

DOI： 10.1016/j.ijheatmasstransfer.2014.10.012

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DOI： 10.1016/j.jiec.2014.06.031

Language：English  

DOI： 10.1002/apj.1852

Language：English  

DOI： 10.1016/j.carbon.2014.09.014

Language：English  

DOI： 10.1016/j.appithermaleng.2014.06.066

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.applthermaleng.2014.06.018

Language：English  

DOI： 10.1016/j.applthermaleng.2014.03.062

Language：English  

DOI： 10.1016/j.carbon.2014.05.079

Language：English  

DOI： 10.1016/j.jiec.2013.07.015

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English  

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DOI： 10.1021/la500216n

Language：Japanese  

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DOI： 10.1007/s00723-013-0504-4

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DOI： 10.1016/j.seppur.2013.12.031

Language：English  

DOI： 10.1016/j.fuel.2013.10.081

Language：English  

DOI： 10.1016/j.fuel.2013.09.057

Language：English  

DOI： 10.1016/j.jiec.2013.04.007

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DOI： 10.1016/j.jiec.2013.04.003

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DOI： 10.1016/j.jiec.2013.04.004

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jhazmat.2013.04.049

Language：English  

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DOI： 10.1007/s00723-013-0466-6

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DOI： 10.1016/j.jiec.2013.02.005

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DOI： 10.1016/j.cej.2013.03.099

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DOI： 10.1016/j.fuproc.2012.11.001

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DOI： 10.1016/j.electacta.2012.12.124

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DOI： 10.1016/j.jiec.2012.09.014

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DOI： 10.4028/www.scientific.net/AMR.626.551

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DOI： 10.1016/j.fuel.2012.09.057

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DOI： 10.1088/0957-4484/23/35/355601

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DOI： 10.1016/j.electacta.2012.05.080

Language：English  

DOI： 10.1021/ef201771f

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.cattod.2011.09.036

Language：English  

DOI： 10.1021/ef201771f

Language：English  

DOI： 10.1002/mrc.3804

Language：English  

DOI： 10.1007/s12404-012-0114-z

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DOI： 10.1016/j.fuel.2011.10.017

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.apcatb.2011.09.012

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DOI： 10.1007/s10853-011-5872-2

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

DOI： 10.1088/0957-4484/22/26/265106

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DOI： 10.1016/j.cattod.2010.10.083

Language：English  

DOI： 10.1016/j.jiec.2011.02.020

Repository Public URL： http://hdl.handle.net/2324/25462

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DOI： 10.1016/j.carbon.2010.08.047

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DOI： 10.1021/nn102452q

Language：English  

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DOI： 10.1002/smll.201001263

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DOI： 10.1016/S1872-5805(09)60018-4

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

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Authorship：Last author   Language：Japanese  

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Book type：Scholarly book

Environmentally benign adsorption heat pump (AHP) and desalination (AD) systems have already attracted considerable attention for space cooling/heating and potable water production since they require no electricity and are driven by solar or waste heat. The adsorbent material is the key element of these adsorption systems. Highly porous carbon-based consolidated composites are very promising adsorbents. Specific heat capacity (cp) of adsorbent is one of the most significant thermophysical properties. It plays a vital role in predicting the performance of the systems accurately. However, the estimation of the cp of adsorbent materials is a demanding issue and has not been focused sufficiently yet. Therefore, this chapter will present the significance of specific heat capacity, detailed experimental procedure, and the cp of composites, as well as the parent materials at the operating temperature range of AHP and AD systems. Finally, all the experimental data are analyzed rigorously and correlated with the established equations of cp. The presented experimental cp data along with the fitted parameters are crucial in the design of AHP and AD systems.

DOI： 10.1007/978-3-030-93845-1_4

Scopus

Language：Japanese   Book type：Scholarly book

Language：Japanese   Book type：Scholarly book

Event date： 2024.9

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Venue：Phoenix Seagaia Resort, Miyazaki   Country：Japan  

Event date： 2024.9

Language：English   Presentation type：Poster presentation  

Venue：Phoenix Seagaia Resort, Miyazaki   Country：Japan  

Event date： 2024.9

Language：English   Presentation type：Poster presentation  

Venue：Phoenix Seagaia Resort, Miyazaki   Country：Japan  

Event date： 2024.9

Language：English   Presentation type：Poster presentation  

Venue：Phoenix Seagaia Resort, Miyazaki   Country：Japan  

Event date： 2024.9

Language：English   Presentation type：Poster presentation  

Venue：Phoenix Seagaia Resort, Miyazaki   Country：Japan  

Event date： 2024.9

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Venue：Phoenix Seagaia Resort, Miyazaki   Country：Japan  

Event date： 2024.9

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Venue：The Waterfront Hotel, Kuching, Sarawak   Country：Malaysia  

Event date： 2024.7

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Venue：Tsinghua Shenzhen International Graduate School   Country：China  

Other Link： http://carbon2024.sz-graphene.ac.cn/eindex.html

Event date： 2024.7

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

Venue：Tsinghua Shenzhen International Graduate School   Country：China  

Event date： 2024.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Tsinghua Shenzhen International Graduate School   Country：China  

Event date： 2024.7

Language：English   Presentation type：Poster presentation  

Venue：Tsinghua Shenzhen International Graduate School   Country：China  

Event date： 2024.7

Language：English   Presentation type：Poster presentation  

Venue：Tsinghua Shenzhen International Graduate School   Country：China  

Event date： 2024.7

Language：English   Presentation type：Poster presentation  

Venue：Tsinghua Shenzhen International Graduate School   Country：China  

Event date： 2024.7

Language：English   Presentation type：Poster presentation  

Venue：Shenzhen International Graduate School of Tsinghua University   Country：China  

Event date： 2024.7

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Venue：Shenzhen International Graduate School of Tsinghua University   Country：China  

Event date： 2024.7

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Venue：Shenzhen International Graduate School of Tsinghua University   Country：China  

Event date： 2024.7

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Venue：Shenzhen International Graduate School of Tsinghua University   Country：China  

Event date： 2024.7

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Venue：Shenzhen International Graduate School of Tsinghua University   Country：China  

Event date： 2024.7

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Venue：オンライン   Country：Japan  

Event date： 2024.7

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Venue：MINATO HOTEL, Nagasaki   Country：Japan  

Event date： 2024.3

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Venue：九州大学病院キャンパス総合研究棟105セミナー室（〒812-8582 福岡市東区馬出3-1-1）   Country：Japan  

Event date： 2024.2

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Venue：信州大学先鋭領域融合研究群先鋭材料研究所（〒380-8553 長野市若里4-17-1）   Country：Japan  

Event date： 2023.12

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Venue：石川県立音楽堂交流ホール（〒920-0856 石川県金沢市昭和町20-1）   Country：Japan  

Event date： 2023.11 - 2023.12

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Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.11 - 2023.12

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Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.11 - 2023.12

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Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.11 - 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.11 - 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.11 - 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.11 - 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京エレクトロンホール宮城（〒980-0803 宮城県仙台市青葉区国分町3-3-7）   Country：Japan  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：MINATO HOTEL（〒851-1201　⻑崎市伊王島町2丁⽬）   Country：Japan  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：MINATO HOTEL（〒851-1201　⻑崎市伊王島町2丁⽬）   Country：Japan  

Event date： 2023.8

Language：English  

Venue：Online   Country：Korea, Republic of  

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Event date： 2023.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

Event date： 2023.8

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

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

Event date： 2023.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

Event date： 2023.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

Event date： 2023.8

Language：English  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

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Event date： 2023.8

Language：English  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

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Event date： 2023.8

Language：English  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

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Event date： 2023.8

Language：English  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

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Event date： 2023.8

Language：English  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

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Event date： 2023.8

Language：English  

Venue：Onnuri Hall, Star Center, Jeonju University   Country：Korea, Republic of  

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Event date： 2023.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barceló Riviera Maya   Country：Mexico  

Event date： 2023.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barceló Riviera Maya   Country：Mexico  

Event date： 2023.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barceló Riviera Maya   Country：Mexico  

Event date： 2023.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barceló Riviera Maya   Country：Mexico  

Event date： 2023.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barceló Riviera Maya   Country：Mexico  

Event date： 2023.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barceló Riviera Maya   Country：Mexico  

Event date： 2023.7

Language：English  

Venue：Barceló Riviera Maya   Country：Mexico  

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Event date： 2023.7

Language：English  

Venue：Barceló Riviera Maya   Country：Mexico  

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Event date： 2023.7

Language：English  

Venue：Barceló Riviera Maya   Country：Mexico  

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Event date： 2023.7

Language：English  

Venue：Barceló Riviera Maya   Country：Mexico  

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Event date： 2023.7

Language：English  

Venue：Barceló Riviera Maya   Country：Mexico  

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Event date： 2023.7

Language：English  

Venue：Barceló Riviera Maya   Country：Mexico  

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Event date： 2023.6

Language：English  

Venue：University of Banja Luka   Country：Bosnia and Herzegovina  

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Event date： 2023.3

Language：Japanese  

Venue：東京理科大学野田キャンパス   Country：Japan  

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Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路市市民会館   Country：Japan  

Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路市市民会館   Country：Japan  

Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路市市民会館   Country：Japan  

Event date： 2022.12

Language：Japanese  

Venue：姫路市市民会館   Country：Japan  

Event date： 2022.12

Language：Japanese  

Venue：姫路市市民会館   Country：Japan  

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Event date： 2022.12

Language：Japanese  

Venue：姫路市市民会館   Country：Japan  

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Event date： 2022.12

Language：Japanese  

Venue：姫路市市民会館   Country：Japan  

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Event date： 2022.12

Language：Japanese  

Venue：姫路市市民会館   Country：Japan  

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Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：JA長野県ビル アクティーホール   Country：Japan  

Event date： 2022.11

Language：Japanese  

Venue：JA長野県ビル アクティーホール   Country：Japan  

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Event date： 2022.10

Language：English  

Venue：キャンパスプラザ京都   Country：Japan  

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Event date： 2022.10

Language：Japanese  

Venue：キャンパスプラザ京都   Country：Japan  

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Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：キャンパスプラザ京都   Country：Japan  

Event date： 2022.9

Language：Japanese  

Venue：キャンパスプラザ京都   Country：Japan  

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Event date： 2022.9

Language：Japanese  

Venue：キャンパスプラザ京都   Country：Japan  

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Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Imperial College London   Country：United Kingdom  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Imperial College London   Country：United Kingdom  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Imperial College London   Country：United Kingdom  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Imperial College London   Country：United Kingdom  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Imperial College London   Country：United Kingdom  

Event date： 2022.7

Language：English  

Venue：Imperial College London   Country：United Kingdom  

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Event date： 2022.7

Language：English  

Venue：Imperial College London   Country：United Kingdom  

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Event date： 2022.7

Language：English  

Venue：Imperial College London   Country：United Kingdom  

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Event date： 2022.7

Language：English  

Venue：Imperial College London   Country：United Kingdom  

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Event date： 2022.7

Language：English  

Venue：Imperial College London   Country：United Kingdom  

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Event date： 2022.7

Language：English  

Venue：Imperial College London   Country：United Kingdom  

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Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンデマンド配信   Country：Japan  

Event date： 2021.8

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.12 - 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.12 - 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学創立五十周年記念館   Country：Japan  

Event date： 2019.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Shanghai Jiao Tong University   Country：China  

Event date： 2019.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Bankoku Shinryokan, Nago, Okinawa   Country：Japan  

Event date： 2019.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Bankoku Shinryokan, Nago, Okinawa   Country：Japan  

Event date： 2019.10

Language：English   Presentation type：Oral presentation (general)  

Venue：GKU Hall Building, Institut Teknologi Sumatera (ITERA)   Country：Indonesia  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学筑紫キャンパス   Country：Japan  

Event date： 2019.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Lexington Convention Center   Country：United States  

Event date： 2019.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Lexington Convention Center   Country：United States  

Event date： 2019.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Lexington Convention Center   Country：United States  

Event date： 2019.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Lexington Convention Center   Country：United States  

Event date： 2019.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Lexington Convention Center   Country：United States  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：甲南大学 岡本キャンパス   Country：Japan  

Event date： 2019.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Conference Room, 2F, I2CNER Bld. 1, Kyushu University   Country：Japan  

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場、西日本総合展示場、ミクニワールドスタジアム北九州   Country：Japan  

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場、西日本総合展示場、ミクニワールドスタジアム北九州   Country：Japan  

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場、西日本総合展示場、ミクニワールドスタジアム北九州   Country：Japan  

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場、西日本総合展示場、ミクニワールドスタジアム北九州   Country：Japan