Shear-induced reaction-limited aggregation kinetics of Brownian particles at arbitrary concentrations

被引:45
|
作者
Zaccone, Alessio [1 ]
Gentili, Daniele [1 ]
Wu, Hua [1 ]
Morbidelli, Massimo [1 ]
机构
[1] ETH, Dept Chem & Appl Biosci, CH-8093 Zurich, Switzerland
来源
JOURNAL OF CHEMICAL PHYSICS | 2010年 / 132卷 / 13期
关键词
SPHERES; SUSPENSIONS; FIELD;
D O I
10.1063/1.3361665
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
The aggregation of interacting Brownian particles in sheared concentrated suspensions is an important issue in colloid and soft matter science per se. Also, it serves as a model to understand biochemical reactions occurring in vivo where both crowding and shear play an important role. We present an effective medium approach within the Smoluchowski equation with shear which allows one to calculate the encounter kinetics through a potential barrier under shear at arbitrary colloid concentrations. Experiments on a model colloidal system in simple shear flow support the validity of the model in the concentration range considered. By generalizing Kramers' rate theory to the presence of shear and collective hydrodynamics, our model explains the significant increase in the shear-induced reaction-limited aggregation kinetics upon increasing the colloid concentration. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3361665]
引用
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页数:6
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