缔合流体中胶体粒子间耗尽势的密度泛函理论研究

Depletion Potential Between Two Colloid Particles in an Associating Fluid: a Density Functional Theory Study

基于与耗尽势相关的密度泛函理论,研究了缔合流体中胶体粒子间的耗尽势.通过计算不同条件下2个胶体粒子间的耗尽势,进一步分析了缔合流体中相关因素对耗尽势的影响.结果表明,溶剂分子的体相密度、胶体粒子与溶剂分子的尺寸比率、溶剂分子的官能度和缔合强度及胶体粒子与溶剂分子之间的弱相互作用等因素均可对胶体粒子间耗尽势产生显著影响.

The depletion potential between two colloid particles immersed in an associating fluid was investigated by the classical density functional theory for depletion potential proposed by Roth,Evans and Dietrich.An attempt is made to obtain the effects of several factors concerning colloid particles and solvent molecules on the depletion potential,which are the bulk density of solvent,size ratio of colloid particle to solvent,functionality of solvent and its associated energy,and the interaction between colloid particle and solvent.With the depletion potential under various conditions being presented,it is shown that the effects of these factors on the depletion potential are significant.The results provide some useful clues on regulating the interaction between colloid particles in the related experiments.