DEPLETION STABILIZATION BY SEMIDILUTE RODS

被引:102
作者
MAO, Y
CATES, ME
LEKKERKERKER, HNW
机构
[1] UNIV EDINBURGH,DEPT PHYS & ASTRON,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND
[2] UNIV UTRECHT,VANT HOFF LAB,3584 UTRECHT,NETHERLANDS
关键词
D O I
10.1103/PhysRevLett.75.4548
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The entropic depletion force in colloids arises when large particles are placed in a solution of smaller ones and sterically constrained to avoid them. We calculate the interaction between two hard spheres (of radius R) in a semidilute solution of hard rods of length L and diameter D (D << L << R) to second order in rod concentration. In addition to the well-known attractive force for separations less than L, we find a repulsive force between the spheres at larger separations. For semidilute rods, the resulting barrier can be large compared to k(B)T, permitting kinetic stabilization.
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页码:4548 / 4551
页数:4
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