2022 Fiscal Year Research-status Report
Thermal resonance induced by quasi-Casimir coupling for innovative nanoscale thermal management
| Project/Area Number |
22K20412
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
陳 文涛 九州工業大学, 大学院工学研究院, 支援研究員 (30963201)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Keywords | 準カシミヤカプリング / ナノギャップ / フォノン熱輸送 / 熱共振 / 分子動力学解析 |
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| Outline of Annual Research Achievements |
Quasi-Casimir heat transfer, a new heat transfer mode in the transition regime from heat conduction to thermal radiation, results in the interfacial thermal resonance between two objects. However, the quasi-Casimir coupling between the nanostructures and adsorbed water layers on the solid surfaces is still open for question. Therefore, using nonequilibrium molecular dynamics, we will verify phonon transmission across a nanogap via nanostructures and adsorbed water layers, focusing on quasi-Casimir coupling and thermal resonance.
In the FY 2022, we performed molecular dynamics simulation using the package program LAMMPS. In the nanogap of Pt adsorbed with water molecules, thermal resonance phenomena and phonon transport at the interface were confirmed not only between solid molecules but also between liquid molecules. In a nonequilibrium state, the heat flux across the nanogap increases exponentially with decreasing gap distance, and the thermal resonance between the atoms of the liquid adsorption layers co-occurs with the thermal resonance between the atoms of the solid interface layers. Moreover, the effects of the SiC molecular termination atoms (Si-C, C-Si, Si-Si, and C-C) on the thermal resonance phenomena and phonon transport in the SiC nanogap were clarified.
These results have been presented at the 2022 Thermal Engineering Conference and published in Physical Chemistry Chemical Physics and Nanoscale by the Royal Society of Chemistry.
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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
In the FY 2022, we performed molecular dynamics simulation using the package program LAMMPS. We confirmed thermal resonance phenomena and phonon transport at the interface not only between solid molecules but also between liquid molecules in the nanogap of Pt adsorbed with water molecules. In a nonequilibrium state, the heat flux across the nanogap increases exponentially with decreasing gap distance, and the thermal resonance between the atoms of the liquid adsorption layers co-occurs with the thermal resonance between the atoms of the solid interface layers. Moreover, the effects of the SiC molecular termination atoms (Si-C, C-Si, Si-Si, and C-C) on the thermal resonance phenomena and phonon transport in the SiC nanogap were clarified. These results have been presented at the 2022 Thermal Engineering Conference and published in Physical Chemistry Chemical Physics and Nanoscale by the Royal Society of Chemistry.
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| Strategy for Future Research Activity |
We will study phonon transmission across a nanogap via nanostructures to achieve a new thermal switch driven by thermal resonance when heat transfer between two objects should be dynamically modulated without temperature change. We will analyze phonon transmission across a nanogap including adsorbed water layers with and without an external electric field.
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