Interfaces of polydisperse fluids: Surface tension and adsorption properties

被引:8
作者
Bellier-Castella, L [1 ]
Xu, H
Baus, M
机构
[1] Univ Lyon 1, Dept Phys Mat, CNRS, UMR 5586, F-69622 Villeurbanne, France
[2] Free Univ Brussels, B-1050 Brussels, Belgium
来源
PHYSICAL REVIEW E | 2002年 / 65卷 / 02期
关键词
D O I
10.1103/PhysRevE.65.021503
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We consider a system of spherical colloidal particles with a size polydispersity and use a simple van der Waals description in order to study the combined effect of both the polydispersity and the spatial nonuniformity induced by a planar interface between a low-density fluid phase (enriched in small particles) and a high-density fluid phase (enriched in large particles). We find a strong adsorption of small particles at the interface. the latter being broadened with respect to the monodisperse case. We also find that the surface tension of the polydisperse system results from a competition between the tendency of the polydispersity to lower the surface tension and its tendency to raise the critical-point temperature (i.e., its tendency to favor phase separation) with the former tendency winning at low temperatures and the latter at the higher temperatures.
引用
收藏
页码:1 / 021503
页数:11
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