2001 Fiscal Year Final Research Report Summary
Investigation on the-Properties of Ill-Condensed Molecular
| Project/Area Number |
09304066
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機能・物性・材料
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| Research Institution | Osaka University |
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Principal Investigator |
MATSUO Takasuke OSAKA UNIVERSITY, GRADUATE SCHOOL OF SCIENCE, PROFESSOR, 大学院・理学研究科, 教授 (00028185)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMURO Osamu GRADUATE SCHOOL OF SCIENCE, OSAKA UNIVERSITY, ASSISTANT PROFESSOR, 大学院・理学研究科, 講師 (20200777)
INABA Akira GRADUATE SCHOOL OF SCIENCE, OSAKA UNIVERSITY, ASSOCIATE PROFESSOR, 大学院・理学研究科, 助教授 (30135652)
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| Project Period (FY) |
1997 – 2000
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| Keywords | Glassy state / Relaxation / Enthalpy relaxation / Volume relaxation / Molecular glass / Amorphous ice / Glassy crystal / Vapor-deposited amorphous state |
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| Research Abstract |
1. An adiabatic calorimeter in which the sample part can be detached from the cryostat has been designed and constructed. A sample immersed directly in liquid nitrogen is transferred into the cryostat for calorimetric measurement. Examination on several substances showed the high accuracy and precision of the apparatus equivalent to or exceeding the best adiabatic calorimeter.
2. An adiabatic calorimeter incorporating a dilatometer has been constructed and used for a glass transition study of polystyrene.
3.An apparatus has been constructed for preparation of amorphous substances by deposition of vapor onto a cold wall kept at 5 K. The apparatus mounted in a neutron beam has been successfully operated for neutron scattering experiment on vapor-deposited amorphous ice and other substances that cannot be amorphized by supercooling of the liquid. The neutron diffraction showed strong small angle scattering that provides evidence for heterogeneity of the amorphous state.
4. Glassy hydrocarbons and alcohols have been prepared in the calorimeter and their configurational entropies determined accurately. Dielectric relaxation times characterized by non-Arrhenius temperature dependence have been interpreted consistently by the Adam-Gibbs theory utilizing the entropy data. The entropy values also gave the size of Cooperatively Rearranging Regions as a function of temperature.
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