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Understanding the asymmetry between advancing and receding microscopic contact angles

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Abstract

By means of molecular dynamics simulation, the advancing and receding microscopic contact angles were analyzed for a shear flow of two mono-atomic fluids confined between parallel non-polar solid walls. We defined the microscopic dynamic contact angle based on the coarse-grained microscopic density distribution of the fluids (the instantaneous interface method [Willard and Chandler, J. Phys. Chem. B, 2010, 114, 1954–1958]) near the moving contact line. We have found that the asymmetric change of fluid density near the wall with respect to the moving contact line results in a different dependence between the advancing and receding contact angles on the contact line velocity in a system where the two fluids across the interface have unequal wettability to the solid wall. This difference between the advancing and receding contact angles leads to different flow resistance caused by the advancing and receding contact lines, which should have impact on the industrial applications of the fine fluid transportation with contact lines.

Graphical abstract: Understanding the asymmetry between advancing and receding microscopic contact angles

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Publication details

The article was received on 14 Mar 2019, accepted on 08 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9SM00521H
Citation: Soft Matter, 2019, Advance Article

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    Understanding the asymmetry between advancing and receding microscopic contact angles

    T. Omori, Y. Kobayashi, Y. Yamaguchi and T. Kajishima, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM00521H

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