期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.197801
关键词
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资金
- Core Research for Evolutional Science and Technology (CREST) program of the Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [20106005] Funding Source: KAKEN
With the aid of molecular dynamics simulation, we consider why the diffusivity of liquid becomes slower as the liquid is confined to a narrower space. The diffusion coefficient of octamethylcyclotetrasiloxane liquid confined between two mica surfaces was calculated for a range of surface separations from 64 to 23 angstrom. The resulting separation dependence of the diffusion coefficient can be explained by considering that the molecular diffusion is an activated process. In particular, we find that the increase in the activation energy is closely correlated with the decrease of the potential energy per molecule, from which we propose a molecular-level mechanism of this confined-induced diffusion slowdown.
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