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Coupling effects of depletion interactions in three-sphere colloidal system |
Chen Ze-Shun (陈泽顺)a b, Dai Gang (戴刚)a, Gao Hai-Xia (高海峡)a b, Xiao Chang-Ming (肖长明)a |
a Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Electronic Engineering, Hunan University of Science and Engineering, Yongzhou 425100, China |
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Abstract In a three-sphere system, the middle sphere is acted by two opposite depletion forces from the other two spheres. It is found that, in this system, the two depletion forces are coupled with each other and result in a strengthened depletion force. So the difference of the depletion forces of the three-sphere system and its corresponding two two-sphere systems is introduced to describe the coupling effect of the depletion interactions. The numerical results obtained by Monte-Carlo simulations show that this coupling effect is affected by both the concentration of small spheres and the geometrical confinement. Meanwhile, it is also found that the mechanisms of the coupling effect and the effect on the depletion force from the geometry factor are the same.
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Received: 01 November 2012
Revised: 18 December 2012
Accepted manuscript online:
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PACS:
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82.70.Dd
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(Colloids)
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64.70.qd
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(Thermodynamics and statistical mechanics)
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Fund: Project supported by the Scientific Research Fund of Hunan Provincial Education Department, China (Grant Nos. 08B028 and 10A075) and the Natural Science Foundation of Hunan Province, China (Grant No. 08jj6043). |
Corresponding Authors:
Xiao Chang-Ming
E-mail: cmxiao@hunnu.edu.cn
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Cite this article:
Chen Ze-Shun (陈泽顺), Dai Gang (戴刚), Gao Hai-Xia (高海峡), Xiao Chang-Ming (肖长明) Coupling effects of depletion interactions in three-sphere colloidal system 2013 Chin. Phys. B 22 058202
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