2009 Fiscal Year Final Research Report
Unique cooperative motion of water-Liquid to glass of aqueous solutions
| Project/Area Number |
19540429
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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 |
Biophysics/Chemical physics
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| Research Institution | Tokai University |
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Principal Investigator |
SHINYASHIKI Naoki Tokai University, 理学部, 教授 (00266363)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 水 / 水溶液 / ガラス転移 / 過冷却液体 / 緩和現象 / 複素誘電率 / 協同運動 / Johari-Goldstein relaxation |
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| Research Abstract |
Broadband dielectric measurements were performed at temperatures between 80K and 300K in the frequency range of 1 mHz-30 GHz for various kinds of aqueous solutions. The solutes introduced for the aqueous solutions were glycerol, propanol, ethylene glycol, ethyleneglycol oligomers, fructose, polymers, and proteins. The primary relaxation originated from cooperative motion of water and solute molecules and the secondary relaxation due to local motion of water molecules were observed at around the glass transition temperature for all the aqueous solutions. Since the properties of hydrated proteins, aqueous solutions, and the mixtures of van der Waals liquids are similar, we transfer the theoretical understanding gained in the study of the last systems sequentially to the two other increasingly more complex systems. The primary and secondary processes are inseparable or symbiotic processes.
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[Journal Article] The glass transition and dielectric secondary relaxation of fructose-water mixtures2008
Author(s)
N. Shinyashiki, M. Shinohara, Y. Iwata, T. Goto, M. Oyama, S. Suzuki, W. Yamamoto, S. Yagihara, T. Inoue, S. Oyaizu, S. Yamamoto, K.L. Ngai, S. Capaccioli
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Journal Title
J. Phys. Chem. B 112(48)
Pages: 15470-15477
Peer Reviewed
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