Colloidal dynamics: Influence of diffusion, inertia and colloidal forces on cluster formation

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:325

Article

Kovalchuk, Nina^1,2  Starov, Victor¹  Langston, Paul³  Hilal, Nidal³  Zhdanov, Viacheslav⁴ 

[1] Univ Loughborough, Dept Chem Engn, Loughborough LE11 3TU, Leics, England

[2] Inst Biocolloid Chem, UA-03142 Kiev, Ukraine

[3] Univ Nottingham, Sch Chem & Environm Engn, Nottingham NG7 2RD, England

[4] Moscow State Univ Food Prod, Moscow 125080, Russia

关键词: colloidal suspensions;    Langevin equations;    colloidal forces;    Brownian forces;    hydrodynamic interactions;    fluctuation-dissipation theorem;    clusters;   

DOI  :  10.1016/j.jcis.2008.06.017

来源: Elsevier

【 摘 要 】

Computer simulations of colloidal suspensions are discussed. The simulations are based on the Langevin equations, pairwise interaction between colloidal particles and take into account Brownian, hydrodynamic and colloidal forces. Comparison of two models, one taking into account inertial term in Langevin equation and another based on diffusional approximation proposed in [D.L. Ermak, J.A. McCammon, J. Chem. Phys. 69 (1978) 1352], has shown that both models enable the prediction of the correct values of the diffusion coefficient and residence time of particle in a doublet and are therefore suitable to study the dynamics of formation and breakage of clusters in colloidal suspensions. It is shown that the appropriate selection of the time step and taking into account inertia of particles provides also the correct value of the average kinetic energy of each particle during the simulations, what allows to use the model based on full Langevin equations as a reference model to verify the validity of the numerical scheme for simulation using diffusion approximation. (c) 2008 Elsevier Inc. All rights reserved.

【 授权许可】

Free