Depletion interactions in binary mixtures of repulsive colloids

doi:10.1088/1674-1056/19/10/108204

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 108204-108204.doi: 10.1088/1674-1056/19/10/108204

• CROSS DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Depletion interactions in binary mixtures of repulsive colloids

李卫华, 邱枫

The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, and Department of Macromolecular Science, Fudan University, Shanghai 200433, China

收稿日期:2009-11-10 修回日期:2010-05-24 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 20974026), the Shanghai Pujiang Program of China (Grant No. 08PJ1402000), and the Shanghai Educational Development Foundation of China (Grant No. 2008CG02).

Depletion interactions in binary mixtures of repulsive colloids

Li Wei-Hua(李卫华)^† and Qiu Feng(邱枫)

The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, and Department of Macromolecular Science, Fudan University, Shanghai 200433, China

Received:2009-11-10 Revised:2010-05-24 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 20974026), the Shanghai Pujiang Program of China (Grant No. 08PJ1402000), and the Shanghai Educational Development Foundation of China (Grant No. 2008CG02).

摘要/Abstract

摘要： Acceptance ratio method, which has been used to calculate the depletion potential in binary hard-sphere mixtures, is extended to the computation of the depletion potential of non-rigid particle systems. The repulsive part of the Lennard--Jones pair potential is used as the direct pair potential between the non-rigid particles. The depletion potential between two big spheres immersed in a suspension of small spheres is determined with the acceptance ratio method through the application of Monte Carlo simulation. In order to check the validity of this method, our results are compared with those obtained by the Asakura--Oosawa approximation, and by Varial expansion approach, and by molecular dynamics simulation. The total effective potential and the depth of its potential well are computed for various softness parameters of the direct pair potential.

Abstract: Acceptance ratio method, which has been used to calculate the depletion potential in binary hard-sphere mixtures, is extended to the computation of the depletion potential of non-rigid particle systems. The repulsive part of the Lennard–Jones pair potential is used as the direct pair potential between the non-rigid particles. The depletion potential between two big spheres immersed in a suspension of small spheres is determined with the acceptance ratio method through the application of Monte Carlo simulation. In order to check the validity of this method, our results are compared with those obtained by the Asakura–Oosawa approximation, and by Varial expansion approach, and by molecular dynamics simulation. The total effective potential and the depth of its potential well are computed for various softness parameters of the direct pair potential.

Key words: acceptance ratio method, Monte Carlo, depletion interaction

中图分类号: (Computer simulation of liquid structure)

61.20.Ja

61.25.H- (Macromolecular and polymers solutions; polymer melts) 82.70.Dd (Colloids) 82.70.Kj (Emulsions and suspensions)

李卫华, 邱枫. Depletion interactions in binary mixtures of repulsive colloids[J]. 中国物理B, 2010, 19(10): 108204-108204.

Li Wei-Hua(李卫华) and Qiu Feng(邱枫). Depletion interactions in binary mixtures of repulsive colloids[J]. Chin. Phys. B, 2010, 19(10): 108204-108204.

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Depletion interactions in binary mixtures of repulsive colloids

Depletion interactions in binary mixtures of repulsive colloids

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