Metastable states and the kinetics of colloid phase separation

被引:87
作者
Soga, KG [1 ]
Melrose, JR [1 ]
Ball, RC [1 ]
机构
[1] Univ Cambridge, Cavendish Lab, Polymers & Colloids Grp, Cambridge CB3 0HE, England
关键词
D O I
10.1063/1.477881
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 on the results of extensive Brownian dynamics simulations of colloid phase separation due to depletion flocculation. We study in detail the effect of potential variation at fixed volume fraction of colloid and fixed range of interaction. We find a variety of nonequilibrium behaviors for quenches into the colloid fluid+crystal phase coexistence regime. We present clear evidence of metastability, of homogeneous nucleation, and of a kinetically arrested gel state. We also find evidence that suggests a density instability in the metastable colloid fluid preceding crystal nucleation. Our findings are consistent with a previous proposal that nonequilibrium behavior is determined by a metastable vapor+liquid binodal hidden in the fluid+crystal phase coexistence regime. (C) 1999 American Institute of Physics. [S0021-9606(99)51304-4].
引用
收藏
页码:2280 / 2288
页数:9
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