2006 Fiscal Year Final Research Report Summary
Relationship between surface friction property and surface structure investigated by surface vibration spectroscopy
| Project/Area Number |
17550121
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
YE Shen Hokkaido University, Catalysis Research Center, Associate Professor, 触媒化学研究センター, 助教授 (40250419)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Polymer surface structure / Surface physical property / Surface vibration spectroscopy / Molecular structure at interface / Surface biocompatibility / Sum frequency generation (SFG) / Water / Interface |
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| Research Abstract |
Physical properties and functionalities of soft materials such as polymer and LB films are significantly dependent on their surface/interface molecular structures. Our researches focus upon exploring the molecular structures on the surface and/or interface of the functional organic thin films, by a surface-sensitive non-linear optical vibration spectroscopy, sum frequency generation (SFG), while such structural information is hard to be obtained by the conventional vibration spectroscopy such as infrared (IR) absorption and Raman scattering.
The present research is mainly focused on (1) poly(acrylate) and their co-polymer thin films, (2) polyimide thin films and (3) LB multilayer thin films, in different environments. It is clearly found that most of these polymer materials have ordered structures on the surface although their bulk structures are completely random. The surface structures can be associated with their surface properties. For example, when the poly(2-methoxyethyl acrylate) (PMEA) was immersed into water, a hydrogen bonding between carbonyl group and water molecule was only observed on its surface but not in its bulk. This kind of hydrogen bonding was hard to observe in other poly(acrylate)s and therefore, is expected to related with PMEA's excellent biocompatibility. On the other hand, the surface structures of the poly(acrylate)s are almost identical after rubbing treatment. This is in contrast with polyimide films. A large anisotropic structural feature was observed on the polyimide surface after simple rubbing treatment. The rubbing-induced surface reorientation is dependent on the function groups and π-π stacking of the polyimide. Detailed structural changes on the polyimide surface were analyzed from the SFG results. Furthermore, SFG measurements were also carried out to probe the structure on the any layer-layer interface in a multilayer LB film based on a theoretical model developed by our group recently.
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Research Products
(10 results)
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[Journal Article] Application of in-situ ATR-FTIR Spectroscopy for the Understanding of Complex Reaction Mechanism and Kinetics : Formic Acid Oxidation on a Pt Electrode at Elevated Temperatures2006
Author(s)
Chen, Y.X., Ye, S., Heinen, M., Jusys, Z., Osawa, M., Behm, R.
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Journal Title
J. Phys. Chem. B. 110
Pages: 9534-9544
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Optical Sum-Frequency Emission from Langmuir-Blodgett Films of Variable Thickness : Effects of the Substrate and Polar Orientation of Fatty Acids in the Films2006
Author(s)
Nishida, T., Johnson, M., Holman, J., Osawa, M., Davies, P.B., Ye, S.
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Journal Title
Phys. Rev. Lett. 96
Pages: 77402
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Oxidation States and CO Ligand Exchange Kinetics in a Self-Assembled Monolayer of a Triruthenium Cluster Studied by in situ Infrared Spectroscopy2005
Author(s)
Zhou, W., Ye, S., Abe, M., Nishida, T., Uosaki, K., Osawa, M., Sasaki, Y.
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Journal Title
Chem. Eur. J. 11
Pages: 5040-5054
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Hydrogen Bonding Effects on the Surface Structure and Photoelectrochemical Properties of Nanostructured SnO2 Electrodes Modified with Porphyrin and Fullerene Composites2005
Author(s)
Imahori, H., Liu, J., Hotta, H., Kira, A., Umeyama, T., Matano, Y., Li, G., Ye, S., Isosomppi, M., Tkachenko, N.V., Lemmetyinen, H.
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Journal Title
J. Phys. Chem. B 109
Pages: 18465-18474
Description
「研究成果報告書概要(欧文)」より
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