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

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

›› 2014, Vol. 23 ›› Issue (12): 126401-126401.doi: 10.1088/1674-1056/23/12/126401

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

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

孙宗利^a, 康艳霜^b, 康艳梅^c, 宋建民^b

a Science and Technology College, North China Electric Power University, Baoding 071051, China;
b College of Science, Agriculture University of Hebei, Baoding 071001, China;
c University of International Relations, Beijing 100091, China

收稿日期:2014-06-08 修回日期:2014-06-22 出版日期:2014-12-15 发布日期:2014-12-15
基金资助:
Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 13MS105).

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

Sun Zong-Li (孙宗利)^a, Kang Yan-Shuang (康艳霜)^b, Kang Yan-Mei (康艳梅)^c, Song Jian-Min (宋建民)^b

a Science and Technology College, North China Electric Power University, Baoding 071051, China;
b College of Science, Agriculture University of Hebei, Baoding 071001, China;
c University of International Relations, Beijing 100091, China

Received:2014-06-08 Revised:2014-06-22 Online:2014-12-15 Published:2014-12-15
Contact: Sun Zong-Li E-mail:zongli_sun@163.com
Supported by:
Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 13MS105).

摘要/Abstract

摘要： 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.

关键词: depletion, demixing, colloidal mixture, density functional theory

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.

Key words: depletion, demixing, colloidal mixture, density functional theory

中图分类号: (Phase separation and segregation in colloidal systems)

64.75.Xc

61.20.Gy (Theory and models of liquid structure)

孙宗利, 康艳霜, 康艳梅, 宋建民. Species separation of binary colloidal mixtures in the multi-Gauss potential: Effect of depletion[J]. , 2014, 23(12): 126401-126401.

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[J]. Chin. Phys. B, 2014, 23(12): 126401-126401.

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

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

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