Controlling wetting properties of 4He crystals and pioneering quantum tribology
| Project/Area Number |
26287074
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Nomura Ryuji 東京工業大学, 理学院, 助教 (00323783)
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| Co-Investigator(Kenkyū-buntansha) |
奥田 雄一 東京工業大学, 理工学研究科, 教授 (50135670)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
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| Keywords | 量子固体 / 超流動 / トライボロジー / 摩擦 / 接触角 / 濡れ / Cassie-Baxter state / 結晶成長 / Cassie-Baxter状態 / 物性実験 |
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| Outline of Final Research Achievements |
It was demonstrated that a 4He crystal can undergo motion on an oscillating plate as the result of employing an inchworm driving, a technique that is employed to impart motion, based on the difference between static and dynamic friction forces. However, the observed motion was quite different from the ordinary behavior of classical objects. The movement of these quantum crystals can be attributed to the anomalously quick crystal-superfluid transition, namely crystallization on one side and melting on the other, assisted by superflow induced during the oscillation.
It was demonstrated that controlling the contact angle of a 4He crystal in superfluid is possible on a rough wall. From the comparison of the contact angles and SEM image of the rough wall, the Cassie-Baxter state was likely to be realized on it; the 4He crystal had a direct contact with the protruding parts of the rough surface but superfluid was entrapped between the crystal and the hollow parts of the wall.
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Report
(5 results)
Research Products
(30 results)
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[Journal Article] Spin-Dependent Acoustic Response in the Nonunitary A1 and A2 Phases of Superfluid He3 under High Magnetic Fields2015
Author(s)
S. Murakawa, A. Yamaguchi, M. Arai, M. Wasai, Y. Aoki, H. Ishimoto, R. Nomura, Y. Okuda, Y. Nagato, S. Higashitani, and K. Nagai
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Journal Title
Physical Review Letters
Volume: 114
Issue: 10
Pages: 105304-105304
DOI
Related Report
Peer Reviewed
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