2012 Fiscal Year Final Research Report
Formation of Simple Molecular Glasses by Low-temperature Vapor-deposition and Thermodynamic and Structural Studies on them
| Project/Area Number |
22340119
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KOFU Maiko 東京大学, 物性研究所, 助教 (70549568)
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| Co-Investigator(Renkei-kenkyūsha) |
TATSUMI Soichi 東京大学, 物性研究所, 研究員 (50533684)
ODAGAKI Takashi 東京電機大学, 理工学部, 教授 (90214147)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 熱容量 / エントロピー / X線回折 / 蒸着法 / ガラス転移 / 低エネルギー励起 |
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| Research Abstract |
For low-temperature vapor-deposition experiments, we havemodified the adiabatic calorimeter and x-ray diffractometer in our laboratory, andconstructed a precise vapor-deposition line. We have measured the heat capacities of glassycarbon tetrachloride, propene and propane which are the simplest of the glassy molecularsubstances whose heat capacities have been measured before. Clear excess heat capacitiesat low temperatures and glass transitions were observed in these samples. The inelasticneutron scattering experiments revealed that the excess heat capacity is due to the bosonpeak characteristic to amorphous solids. The x-ray diffraction measurements ofvapor-deposited glassy water, propanol, and 1-pentane have clarified the relation betweenthe annealing effect around the glass transition temperature and hydrogen-bond structure.
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