期刊
JOURNAL OF CHEMICAL PHYSICS
卷 147, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4989764
关键词
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资金
- Industrial Partnership Program Computational Sciences for Energy Research the Foundation for Fundamental Research on Matter (FOM) [14CSER020]
- Netherlands Organization for Scientific Research (NWO)
- Shell Global Solutions International B
- Dutch Sector Plan Physics and Chemistry
- Netherlands Organization for Scientific Research (NWO-VENI) [680.47.432]
We study a three-dimensional system of self-propelled Brownian particles interacting via the Lennard-Jones potential. Using Brownian dynamics simulations in an elongated simulation box, we investigate the steady states of vapour-liquid phase coexistence of active Lennard-Jones particles with planar interfaces. We measure the normal and tangential components of the pressure tensor along the direction perpendicular to the interface and verify mechanical equilibrium of the two coexisting phases. In addition, we determine the non-equilibrium interfacial tension by integrating the difference of the normal and tangential components of the pressure tensor and show that the surface tension as a function of strength of particle attractions is well fitted by simple power laws. Finally, we measure the interfacial stiffness using capillary wave theory and the equipartition theorem and find a simple linear relation between surface tension and interfacial stiffness with a proportionality constant characterized by an effective temperature. Published by AIP Publishing.
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