Coupling effects of depletion interactions in a three-sphere colloidal system |
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| Authors: | Chen Ze-Shun Dai Gang Gao Hai-Xia and Xiao Chang-Ming |
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| Affiliation: | [1]Department of Physics, Hunan Normal University, Changsha 410081, China [2]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 upon 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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| Keywords: | three-sphere system coupling effect of depletion interactions |
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