基于Roth、Evans和Dietrich有关耗尽势的密度泛函理论研究了硬核Yukawa (HCY)流体中胶体粒子间的耗尽势.在极稀溶液条件下,通过计算两个胶体粒子在不同条件下的耗尽势,分析了HCY流体的相关因素对耗尽势的影响.结果表明,胶体粒子与溶剂分子的尺寸比率、HCY流体分子间的相互作用、HCY流体分子的体相密度以及胶体粒子与流体分子之间的相互作用等因素均可对胶体粒子间耗尽势产生显著影响.研究结果可为实验上调控胶体粒子间的相互作用提供可能的线索.%The depletion potential between two colloid particles immersed in a hard-core Yukawa fluid was investigated by density functional theory for the depletion potential proposed by Roth, Evans, and Dietrich. An attempt was made to study the effects of several factors concerning the colloid particles and the solvent molecules on the depletion potential, which are the size ratio of the colloid particle to the solvent, the interaction between solvent molecules, the packing fraction of the solvent, and the interaction between the colloid particle and the solvent. By means of the depletion potential presented under various conditions, it is shown that the effects of these factors on the depletion potential are significant and this can provide some useful clues on regulating the interaction between colloid particles in related experiments.
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