Kyushu University [Keiji Tanaka (Professor) Faculty of Engineering, Department of Applied Chemistry]

In general, surface and interface of polymeric materials are in a different energy state compared with the interior bulk region. Hence, structure and physical properties in the surface and interfacial region are supposed to differ from those in the corresponding bulk phase. The focus of our group is to understand the distinct feature of aggregation states and thermal molecular motion at surface and interface in polymer solid films by spectroscopy, ion-beam techniques, scattering experiments and microscopy. Recently, our group is also interested in photochemistry, leading to development of an interdisciplinary research field between polymer science and photochemistry.

Research

Research Interests

Aggregation States, Physical Properties and Functions of Polymeric Materials
keyword : Surfaces, Interfaces, Thin Films, Nanotechnology
2000.04In general, surface and interface of polymeric materials are in a different energy state compared with the interior bulk region. Hence, structure and physical properties in the surface and interfacial region are supposed to differ from those in the corresponding bulk phase. The focus of our group is to understand the distinct feature of aggregation states and thermal molecular motion at surface and interface in polymer solid films by spectroscopy, ion-beam techniques, scattering experiments and microscopy. Recently, our group is also interested in photochemistry, leading to development of an interdisciplinary research field between polymer science and photochemistry..

Current and Past Project

The objective of this project is to introduce an innovative state-ofthe-art adhesion technology based on an in-situ 4-D multi-scale
analyses of adhered interfaces, in conjunction with molecular-level manipulation and fabrication of polymers. This collaborative work involves strong collaboration between the academe and the industry rooted from establishing fundamental science at interfaces to manufacturing of components for mobilities utilizing the envisioned adhesion technology. This project could also lead significant developments in the areas of sensors and devices, electronics, social infrastructure, and manufacturing, envisioned to accelerate the realization of Society 5.0 by linking these achieved goals to social economic structure transformation.

Academic Activities

Books

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1.	A. Takahara, X. Jiang, N. Satomi, K. Tanaka, T. Kajiyama, Interfacial Aspects of Multicomponent Polymer Materials (Interfacial Characteristics of Amorphous Polystyrene and Binary Polymer Blend Thin Films Based on Scanning Force Microscopy), Plenum Press, 1997.01.
2.	T. Kajiyama, K. Tanaka, S.-R. Ge, A. Takahara, Surface Science of Crystalline Polymers(Scanning Force Microscopic Study of Surface Morphology and Surface Mechanical Properties of Polymeric Solids), Kodansha Scientific Ltd., 1996.01.

Reports

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Papers

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1.	Yukari Oda, Daisuke Kawaguchi, Yuma Morimitsu, Satoru Yamamoto, Keiji Tanaka, Direct Observation of Morphological Transition for an Adsorbed Single Polymer Chain, Scientific Reports, 10.1038/s41598-020-77761-0, 10, 20914, 2020.12, A better understanding of the structure of polymers at solid interfaces is crucial for designing various polymer nano-composite materials from structural materials to nanomaterials for use in industry. To this end, the first step is to obtain information on how synthetic polymer chains adsorb onto a solid surface. We closely followed the trajectory of a single polymer chain on the surface as a function of temperature using atomic force microscopy. Combining the results with a full-atomistic molecular dynamics simulation revealed that the chain became more rigid on the way to reaching a pseudo-equilibrium state, accompanied by a change in its local conformation from mainly loops to trains. This information will be useful for regulating the physical properties of polymers at the interface..
2.	Shinichiro Shimomura, Hisao Matsuno, Kazuaki Sanada, Keiji Tanaka, Cell Adhesion on Glassy Scaffolds with a Different Mechanical Response, JOURNAL OF MATERIALS CHEMISTRY B, 10.1039/c6tb02617f, 5, 4, 714-719, 2017.03.
3.	Atsuomi Shundo, Koichiro Hori, Yasuyuki Tezuka, Takuya Yamamoto, Keiji Tanaka, Load-Induced Frictional Transition at a Well-Defined Alkane Loop Surface, LANGMUIR, 10.1021/acs.langmuir.6b04042, 33, 9, 2396-2401, 2017.03, 自己組織化単分子膜（SAM）は、材料表面に望みの物性・機能性を与えるための分子ツールとして注目され、実デバイスなどにも広く用いられてきた。しかしながら、これまで、SAM形成は線状分子に限定されており、表面物性・機能性への分子末端の影響が避けられないなどの問題があった。しかしながら、本研究では、環状アルカンジスルフィドを用いることで炭化水素環状鎖からなるSAMを形成することに成功し、表面物性・機能性への分子末端の影響を明確にしている。この結果は、材料表面の物性・機能性設計へ新たな指針を提案するものとして高く評価されている。.
4.	Yukari Oda, Cui Zhang, Daisuke Kawaguchi, Hisao Matsuno, Shokyoku Kanaoka, Sadahito Aoshima, Keiji Tanaka, Design of Blood-Compatible Interfaces with Poly(vinyl ether)s, ADVANCED MATERIALS INTERFACES, 10.1002/admi.201600034, 3, 12, 2016.06.
5.	Yudai Ogata, Daisuke Kawaguchi, Keiji Tanaka, An Effect of Molecular Motion on Carrier Formation in a Poly(3-hexylthiophene) Film, Scientific Reports, 10.1038/srep08436, 5, 8436, 2015.04, 本論文は、ポリ（３-ヘキシルチオフェン）（P3HT）膜の光電荷生成と分子運動について検討したものである。 P3HT 膜に光照射すると、正電荷と負電荷との対が形成された後、自発的に正および負電荷に分離されることを見出した。また、この電荷生成の速度定数は、低温では一定であるが、主鎖のねじれ運動に対応する緩和温度から温度とともに増加した。このことから、P3HT膜において分子運動は光電荷生成を支配する因子のひとつであると結論した。.
6.	Jie Zhan, Hisao Matsuno, Hiroyasu Masunaga, Ogawa Hiroki, Keiji Tanaka, Green Solid Films with Tunable Mechanical Properties Made from Deoxyribonucleic Acid, NPG ASIA MATERIALS, 10.1038/am.2014.4, 6, e92, 2014.03.
7.	Yukari Oda, Ayanobu Horinouchi, Daisuke Kawaguchi, Hisao Matsuno, Shokyoku Kanaoka, Sadahito Aoshima, Keiji Tanaka, Effect of Side-Chain Carbonyl Groups on the Interface of Vinyl Polymers with Water, Langmuir, 10.1021/la404802j, 30, 5, 1215-1219, 2014.02.
8.	Yudai Ogata, Daisuke Kawaguchi, Norifumi L. Yamada, Keiji Tanaka, Multistep Thickening of Nafion Thin Films in Water, ACS Macro Letters, 10.1021/mz400322q, 2, 10, 856-859, 2013.10.
9.	Atsuomi Shundo, Koichiro Hori, PENALOZA DAVID JR PENULIAR, Kazuki Yoshihiro, Annaka Masahiko, Keiji Tanaka, Nonsolvents-induced Swelling of Poly(methyl methacrylate) Nanoparticles , Physical Chemistry Chemical Physics, 15, 39, 16574-16578, 2013.10.
10.	Shinichiro Shimomura, Hisao Matsuno, Keiji Tanaka, Effect of Mechanical Instability of Polymer Scaffolds on Cell Adhesion, Langmuir, 10.1021/la4027706, 29, 35, 11087-11092, 2013.09.
11.	Atsuomi Shundo, Koichiro Hori, Takuya Ikeda, Nobuo Kimizuka, Keiji Tanaka, Design of a Dynamic Polymer Interface for Chiral Discrimination, Journal of the American Chemical Society, 10.1021/ja404701s, 135, 28, 10282-10285, 2013.07.
12.	PENALOZA DAVID JR PENULIAR, Atsuomi Shundo, Keigo Matsumoto, Masashi Ohno, Katsuaki Miyaji, Masahiro Goto, Keiji Tanaka, Spatial Heterogeneity in the Sol-gel Transition of a Supramolecular System , Soft Matter, 9, 21, 5166-5172, 2013.06.
13.	Ayanobu Horinouchi, Keiji Tanaka, An Effect of Stereoregularity on the Structure of Poly(methyl methacrylate) at Air and Water Interfaces, RSC Advances, 3, 24, 9446-9452, 2013.06.
14.	Tomoyasu Hirai, Kaoru Kawasaki, Keiji Tanaka, Interfacial Kinetics of a Model Epoxy-Amine Addition Reaction, Phys. Chem. Chem. Phys., 14, 39, 13532-13534, 2012.01, 本論文はエポキシ/アミンのモデル反応に基づき、固体界面近傍における反応動力学評価を行ったものである。活性化エネルギー、衝突頻度因子の算出から、反応の活性化エネルギーはバルク、界面で不変である一方、バルクの衝突頻度因子は界面近傍におけるそれと比較して6倍程度であった。このことから、固体界面の存在はエポキシ硬化反応の化学的な因子には影響を与えず、物理的因子に大きな影響を与えることを明らかにした。.
15.	K.Tanaka, S.Dai, T.Kajiyama, K.Aoi, M.Okada, Aggregation States and Molecular Motion in Amphiphilic Poly(amido amine) Dendrimer Monolayers on Solid Substrates, Langmuir, 10.1021/la0261592, 19, 4, 1196-1202, 19 (4): 1196-1202, 2003.02.
16.	K.Tanaka, P.A.Manning, V.K.Lau, H.Yu, Lipid Lateral Diffusion in Dilauroylphosphatidylcholine/Cholesterol Mixed Monolayers at the Air/Water Interface, Langmuir, 15 (2): 600-606, 1999.01.

Presentations

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1.	Keiji Tanaka, Polymer Relaxation at Interfaces with Inorganic Materials, The 10th Asian-Australasian Conference on Composite Materials (ACCM-10), 2016.10.
2.	Keiji Tanaka, Design of Dynamic Interface of Polymers for Bio-applications, International Conference on Advanced Polymeric Materials Commemorating the 40th Anniversary of the Polymer Society of Korea (IUPAC-PSK40), 2016.10.
3.	Keiji Tanaka, Aggregation States and Proton Conductivity of Nafion in Thin Films, Fluoropolymer 2016, 2016.10.
4.	Keiji Tanaka, An Effect of Chain Dynamics on Carrier Formation Kinetics in Poly(3-alkylthiophene) Films, 10th Korea-Japan Joint Symposium on Polymer Science 2016 (KJJS2016), 2016.09.
5.	Keiji Tanaka, Interfacial Local Conformation of Polymers, The XXV International Materials Research Congress (IMRC2016), 2016.08.
6.	Keiji Tanaka, Relaxation Behavior of Polymer Chains at Solid Interfaces, The XVIIth International Congress on Rheology (ICR2016), 2016.08.
7.	Keiji Tanaka, Aggregation States of a Highly Bio-inert Polymer Blend at Water Interface by Neutron Reflectivity, 14th International Conference on Surface X-ray and Neutron Scattering (SXNS14), 2016.07.
8.	Keiji Tanaka, Structure and Dynamics of Polymer Chains at Solid Interfaces, 2016 Japan-USA Seminar on Polymer Synthesis: -Polymer Synthesis for a Sustainable Future-, 2016.06.
9.	Keiji Tanaka, Local Conformation of Polymer Chains at Solid Interface, The 12th International Symposium on Polymer Physics (PP’2016), 2016.06.
10.	Keiji Tanaka, Polymer Dynamics at Water Interface, 13th Japan-Belgium Symposium on Polymer Science, 2015.11.
11.	Keiji Tanaka, Atsuomi Shundo, Yuji Matsumoto, Mika Aoki, Dependent Rheology in Soft Networked Systems, The 11th International Conference on Advanced Polymers via Macromolecular Engineering (APME 2015), 2015.10.
12.	Keiji Tanaka, Micro-rheology of Supramolecular Systems, International Science & Nature Congress 2015 (ISNaC2015), 2015.09.
13.	Keiji Tanaka, Water Sorption and Proton Conductivity in Thin Nafion Films, Japan-Taiwan Bilateral Polymer Symposium (JTBPS2015), 2015.09.
14.	Keiji Tanaka, Norifumi L. Yamada, Aggregation States of Polymers at Non-solvent Interfaces by Neutron Reflectivity, 2nd Asia-Oceania Conference on Neutron Scattering (AOCNS 2015), 2015.07.
15.	Keiji Tanaka, Tomoyasu Hirai, Yukari Oda, Importance of Precision Synthesis to Study of Polymer Interfaces, International Symposium on Ionic Polymerization 2015 (IP’15), 2015.07.
16.	Keiji Tanaka, Structure and Dynamics of Polymers in Thin Films, The 8th International Conference on Molecular Electronics and Bioelectronics (M&BE8), 2015.06.
17.	Keiji Tanaka, A Facile Fabrication of Microcapsules by Spray Deposition of a Supramolecular Hydrogel, The 31st International Conference of the Polymer Processing Society (PPS-31), 2015.06.
18.	Keiji Tanaka, Shinichiro Shimomura, Hisao Matsuno, Effect of Mechanical Instability at Polymer Surface on Cell Adhesion, The 8th International Conference on Materials Science and Technology (MSAT-8), 2014.12.
19.	Keiji Tanaka, Yuji Matsumoto, PENALOZA DAVID JR PENULIAR, Keigo Matsumoto, Masashi Ohno, Katsuaki Miyaji, Nobutomo Tsuruzoe, Masahiro Goto, Atsuomi Shundo, The Hierarchical Heterogeneity of Supramolecular Hydrogels, 2014 Taiwan-Japan Bilateral Polymer Symposium (TJBPS2014), 2014.11.
20.	Keiji Tanaka, Physical Properties of Polymer Solids: from Bulk to Surface, 9th Joint Conference on Chemistry, 2014.11.
21.	Keiji Tanaka, Yuji Matsumoto, PENALOZA DAVID JR PENULIAR, Keigo Matsumoto, Masashi Ohno, Katsuaki Miyaji, Nobutomo Tsuruzoe, Masahiro Goto, The Hierarchical Heterogeneity of Soft Materials, Korea-Japan Joint Polymer Symposium(KJJS2014), 2014.10.
22.	Keiji Tanaka, PENALOZA DAVID JR PENULIAR, Keigo Matsumoto, Masashi Ohno, Katsuaki Miyaji, Nobutomo Tsuruzoe, Masahiro Goto, Atsuomi Shundo, The Spatial Heterogeneity of Soft Materials, JOINT EMLG - JMLG ANNUAL CONFERENCE, 2014.09.
23.	Keiji Tanaka, Local Conformation of Polymer Chains at Interfaces, MACRO 2014, 2014.07.
24.	Keiji Tanaka, Structure and Dynamics of a Highly Bio‐inert Polymer at Water Interface, The 11th International Symposium on Polymer Physics (PP'2014), 2014.06.
25.	Keiji Tanaka, Toyoaki Hirata, Hisao Matsuno, Daisuke Kawaguchi, Norifumi L. Yamada, Masaru Tanaka, "Surface Reorganization in Polymer Blend Films", The 6th Taiwan-Japan Joint Meeting on Neutron and X-ray Scattering, 2014.03.
26.	Keiji Tanaka, "Local Conformation and Peculiar Dynamics of Polymers at Interfaces", The 13th Pacific Polymer Conference, 2013.11.
27.	Keiji Tanaka, "Spatial Heterogeneity in Soft Materials", 13th Kyushu-Seibu/Pusan-Gyeongnam Joint Symposium on High Polymers (16th) and Fibers (14th), 2013.11.
28.	Keiji Tanaka, "Mesoscopic Heterogeneity in Viscoelastic Properties of Soft Materials", Japan-Korea Joint symposium 2013, 2013.11.
29.	Keiji Tanaka, "Analysis of Structure and Dynamics of Polymers by Interfacial-selective Spectroscopy", International Symposium for the 70th Anniversary of the Tohoku Branch of the Chemical Society of Japan, 2013.09.
30.	Keiji Tanaka, Hirofumi Tsuruta, Hiroshi Morita, "Conformational Relaxation of Polystyrene at Substrate Interface", 7th International Discussion Meeting on Relaxations in Complex Systems, 2013.07.
31.	Keiji Tanaka, "Polymer Structure at Water Interface", 33rd International Conference on Solution Chemistry, 2013.07.
32.	Keiji Tanaka, Hirofumi Tsuruta, Yoshihisa Fujii, Hiroshi Morita, "Conformational Relaxation of Polystyrene at Substrate Interface", APS March Meeting 2013, 2013.03.
33.	Keiji Tanaka, Hirofumi Tsuruta, Ayanobu Horinouchi, "Structural Relaxation of Polystyrene at Interfaces", The 9th SPSJ International Polymer Conference (IPC 2012), 2012.12.
34.	Keiji Tanaka, Tomoyasu Hirai, Masayuki Haraguchi, Atsushi Sakai, Masaaki Ozawa, Katsuaki Miyaji, "Wetting Behavior of Poly(fluoroalkyl methacrylate) Films", FLUOROPOLYMER 2012, 2012.10.
35.	Keiji Tanaka, Koichiro Hori, PENALOZA DAVID JR PENULIAR, Atsuomi Shundo, "Time-dependent Heterogeneity in Viscoelastic Properties of Worm-like micelle Solutions by Optical Tweezers", Ⅻ International Materials Research Congress (IMRC2012), 2012.08.
36.	Keiji Tanaka, Atsuomi Shundo, "Mesoscopic Heterogeneity in Supramolecular Systems", International Union of Pure and Applied Chemistry MACRO 2012(IUPAC-MACRO 2012), 2012.06.

Membership in Academic Society

THE SURFACE FINISHING SOCIETY OF JAPAN
THE ADHESION SOCIETY OF JAPAN
THE SOCIETY OF RUBBER SCIENCE AND TECHNOLOGY, JAPAN
THE JAPANESE PHOTOCHEMISTRY ASSOCIATION
The Japanese Photochemistry Association
The Surface Finishing Society of Japan
The Japan Society of Applied Physics
The Society of Polymer Science, Japan
The Society of Rheology, Japan
The Society of Fiber Science and Technology, Japan
The Adhesion Society of Japan
The Chemical Society of Japan
The Japanese Society for Neutron Science
The American Chemical Society
The American Physical Society

Awards

Fellow
Study on Structure, Physical Properties and Function of Polymers at Interfaces
Thermal Molecular Motion of Polymers at Non-Solvent Interfaces

Educational

Educational Activities

General Chemistry
English for Chemists
Polymer Chemistry
Polymeric Materials
Physical Properties of Polymers
Analyses of Physical Properties in Solid Materials
General Chemistry for Korean Students
Students Lab.
Grad. Students Lab.
Polymer Chemistry at Tokyo Tech.
Polymer Chemistry at Ryukyu Univ.

Other Educational Activities

2010.09.
2009.12.
2009.10.
2008.07.

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