Microscopic theory for interface fluctuations in binary liquid mixtures
软凝聚态物质
2009-11-11 v1
摘要
Thermally excited capillary waves at fluid interfaces in binary liquid mixtures exhibit simultaneously both density and composition fluctuations. Based on a density functional theory for inhomogeneous binary liquid mixtures we derive an effective wavelength dependent Hamiltonian for fluid interfaces in these systems beyond the standard capillary-wave model. Explicit expressions are obtained for the surface tension, the bending rigidities, and the coupling constants of compositional capillary waves in terms of the profiles of the two number densities characterizing the mixture. These results lead to predictions for grazing-incidence x-ray scattering experiments at such interfaces.
引用
@article{arxiv.cond-mat/0605421,
title = {Microscopic theory for interface fluctuations in binary liquid mixtures},
author = {Thorsten Hiester and S. Dietrich and Klaus Mecke},
journal= {arXiv preprint arXiv:cond-mat/0605421},
year = {2009}
}
备注
23 pages, 11 figures