Species separation of binary colloidal mixtures in the multi-Gauss potential: Effect of depletion

doi:10.1088/1674-1056/23/12/126401

Abstract For the asymmetrical colloidal mixture subject to a confining potential and an external multi-Gauss potential, the separation of species is studied based on the classical density functional theory of simple fluids. The multi-Gauss potential consists of several Gauss barriers, which are distributed along the axial direction with uniform distance. The barrier width, barrier distance, and barrier height are individually adjusted to investigate their effects on the species separation. From the numerical results, it is concluded that in each condition, the competition between the external potential and the depletion potential determines the phase equilibrium and the separation. Species separation appears only in the region where the depletion is dominant. On the contrary, both species are absent in the regions where the external potential takes the absolute advantage.

Keywords: depletion demixing colloidal mixture density functional theory

Received: 08 June 2014
Revised: 22 June 2014
Accepted manuscript online:

PACS:	64.75.Xc	(Phase separation and segregation in colloidal systems)
	61.20.Gy	(Theory and models of liquid structure)

Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 13MS105).

Corresponding Authors: Sun Zong-Li
E-mail: zongli_sun@163.com

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Sun Zong-Li (孙宗利), Kang Yan-Shuang (康艳霜), Kang Yan-Mei (康艳梅), Song Jian-Min (宋建民) Species separation of binary colloidal mixtures in the multi-Gauss potential: Effect of depletion 2014 Chin. Phys. B 23 126401


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Species separation of binary colloidal mixtures in the multi-Gauss potential: Effect of depletion

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