COLLOIDS DISPERSED IN POLYMER-SOLUTIONS - A COMPUTER-SIMULATION STUDY

被引:264
作者
MEIJER, EJ
FRENKEL, D
机构
[1] FOM Institute for Atomic and Molecular Physics, 1098 SJ Amsterdam
关键词
D O I
10.1063/1.467003
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report a computer-simulation study of a simple model for a colloid dispersed in a polymer solution. The simulations were performed using a computational scheme that allows simulation at constant osmotic pressure of the polymers. We present results for the polymer-induced interaction, the equation-of-state, and the phase diagram. The simulations show that when the radius of gyration of the polymers R(g) is sufficiently large compared to the diameter of the colloidal particles sigma(col) (2R(g)/sigma(col)greater than or equal to 0.45), addition of polymer induces a colloidal ''liquid-vapor'' phase separation. For shorter polymers, only the solid-fluid transition is observed. In addition, we find that the nonpairwise additivity of the polymer-induced attraction between the colloidal particles has a pronounced effect on the equation-of-state and the phase behavior of a colloid-polymer mixture. The perturbation theory of Lekkerkerker et al. [Europhys. Lett. 20, 559 (1992)] is found to perform well, except at low densities.
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页码:6873 / 6887
页数:15
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