2018 Fiscal Year Final Research Report
Unveiling thermally activated dynamics in liquids and microscopic origin of viscosity
| Project/Area Number |
17K14371
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Biological physics/Chemical physics/Soft matter physics
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| Research Institution | Oita University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Keywords | 液体 / ガラス / 粘度 / 非弾性X線散乱 / 分子動力学シミュレーション / ガラス転移現象 / 動的構造 / 応力緩和 |
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| Outline of Final Research Achievements |
Local dynamics of atoms in liquids has been studied with inelastic X-ray scattering, neutron scattering, and molecular dynamics simulation. Inelastic X-ray scattering experiments revealed elementary excitation in the dynamics of liquid water and its connection to viscosity through real-space, real-time correlation function, so-called van-Hove function (VHF). We clearly found isotope effects on structural relaxation in liquids.
We also performed Brownian dynamics simulation and neutron scattering experiments on charged colloidal suspension under steady shear. The results show a close connection between steady shear viscosity and anisotropic pair-distribution function.
Molecular dynamics simulation on various liquid metals have showed a strong correlation between atomic level pressures and local shear relaxations, indicating that local structure-dynamics relationship holds.
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| Free Research Field |
液体やガラスの物理
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| Academic Significance and Societal Importance of the Research Achievements |
液体は，我々の身の回りに多く存在するが，液体状態の複雑性のために十分な理解が得られてない部分が大きい．例えば，液体の粘度を構造から事前に予測することはできない．近年の実験技術や計算機の進歩は，実空間での原子や分子の運動を捉えることを可能にしており，液体に関する新規な知見を得ることが期待されている．本研究では，水の実時空間相関関数を導くことに成功し，この結果は液体科学の進歩に大きく貢献している．
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