2020 Fiscal Year Annual Research Report
ポリマー繊維整然配列によってヒドロゲル熱伝導率の研究について
| Project/Area Number |
20J22608
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| Research Institution | The University of Tokyo |
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Principal Investigator |
GUO RULEI 東京大学, 工学系研究科, 特別研究員(DC1)
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| Project Period (FY) |
2020-04-24 – 2023-03-31
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| Keywords | TDTR / FDTR / Mapping |
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| Outline of Annual Research Achievements |
1. Construction of frequency domain thermal reflectance (FDTR) experiment setup for thermal conductivity measurement.FDTR is a popular method for determining the thermal properties of thin films due to its accuracy and flexibility. Its effectiveness has been verified on silicon and fused quartz and the results conform with the reference values.
2. Construction of mapping stage for thermal conductivity measurement. To extend FDTR into an imaging technique capable of producing micrometer-scale maps of several thermophysical properties simultaneously, a mapping stage was introduced to our FDTR setup. The spatial resolution is around 1 micrometer. And the measurement speed is around 1 min/point. We use an autofocus algorithm to make sure in focus during measurement.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
A thermal conductivity measurement setup (frequency domain thermal reflectance) has been constructed. And we also extend the FDTR setup into an imaging technique capable of producing micrometer-scale maps of several thermophysical properties simultaneously by introducing a mapping stage. And I also have learned some other thermal conductivity measurement methods, such as the 3 omega method, TDTR, laser flash, and the steady-state method. With these methods, severy interesting samples have been investigated, such as FeRh and platinum thin film. In the future, these methods can also be used to investigate amorphous hydrogels and ordered hydrogels.
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| Strategy for Future Research Activity |
1. Fabrication of ordered hydrogels. In this step, the ways of fabricating ordered hydrogels will be investigated. Recent works have reported novel highly ordered hydrogels by electric field, magnetic field, mechanical force, self-assembly, and freezing casting. Those works mainly focus on mechanical behavior, but the ways they used to align hydrogels can be learned in order to find suitable fabrication methods for our research.
2. Experimental measurement of the thermal conductivity. In this step, the thermal conductivity of the ordered hydrogels will be measured experimentally by the 3ω method, the hot-wire method or other suitable methods.
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