The depletion potential between two colloid particles immersed in a Lennard-Jones fluid is investigated by the density functional theory for depletion potential proposed by Roth, Evans and Dietrich. An attempt is made to study the effects of several factors concerning colloid particles and solvent molecules on the depletion potential, which are the volume fraction of solvent, the size ratio of colloid particle to solvent, the interaction between solvent molecules, and the interaction between colloid particle and solvent. By means cif 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 the related experiments.
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