2015 Fiscal Year Annual Research Report
乱れを制御可能な系におけるガラス転移・ジャミングの研究
| Project/Area Number |
15F15325
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| Research Institution | The University of Tokyo |
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Principal Investigator |
田中 肇 東京大学, 生産技術研究所, 教授 (60159019)
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| Co-Investigator(Kenkyū-buntansha) |
TONG HUA 東京大学, 生産技術研究所, 外国人特別研究員
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| Project Period (FY) |
2015-11-09 – 2018-03-31
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| Keywords | Grass Transition / Correlation / Order Parameter |
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| Outline of Annual Research Achievements |
1. We have studied “Correlation between structure, dynamics, and mechanical response in glassy systems” and found the following:(1) The force and stress fields decouple with the geometric structure in the inherent structures;(2) The vibrational motion in glasses at low temperature decouples with the geometric structure;(3) The α-relaxation procession is correlated with the geometric structure;(4) The relation between the long-range stress correlation and glassy dynamics is clarified.
2. We have studied “In between the order and the disorder: The nature of polydisperse systems in two dimensions” and found the following:(1) The temperature dependences of α-relaxation time and correlation length of bond-orientational order change with increasing polydispersity;(2) The nature of the liquid-solid transition changes from first-order phase transition into glass transition when polydispersity increases from zero to a large value;(3) At intermediate polydispersity, the liquid-solid transition and the resulting solid show unique features.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
1. For the project “Correlation between structure, dynamics, and mechanical response in glassy systems”, beside the achievements already obtained, we still lack the following:(1) Extensive studies in other model glass systems to check the generality of our results;(2) Quantitative relation between the structural, dynamical, and mechanical correlations.
2. For the project “In between the order and the disorder: The nature of polydisperse systems in two dimensions”, beside the achievements already obtained, we still lack the following:(1) Understand the nature of liquid-solid transition, especially at intermediate polydispersities, from phase-transition theory;(2) Extensive studies in other model glass systems to check the generality of our results;(3) A phase diagram of polydisperse systems in two dimensions, and a clear physical picture about the role of polydispersity in changing the nature of liquid-solid transition.
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| Strategy for Future Research Activity |
1.For the project “Correlation between structure, dynamics, and mechanical response in glassy systems”, we plan to perform studies as specified in the above “Current Status” section.
2.For the project “In between the order and the disorder: The nature of polydisperse systems in two dimensions”, we plan to perform studies as specified in the above “Current Status” section.
3.To understand the nature of the glass transition, we plan to define some order parameter from mechanical properties:(1)Start from 2D polydisperse systems, define the order parameter to properly capture the correlation(2)Extend to binary systems(3)Extend to 3D systems.
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Research Products
(1 results)
