约束条件下大小胶球尺寸比值对排空作用的研究

Depletion Interaction in Colloidal Systems of Different Size Ratio of Large-to Small-sphere

采用Monte Carlo方法与接受率方法研究了由大小胶球组成的胶体系统中大胶球间的排空作用.通过对比四种不同半径比值的大胶球间的排空作用发现,大胶球间的排空作用随着半径比值增加而增大;几何约束下大胶球间排空作用大于无约束的情形.

In binary colloidal systems, the depletion forces between two large-spheres of different size ratio are studied through Monte Carlo simulations and acceptance ratio method. Compared with the depletion forces of 4 kinds of size ratio, the numerical results show that the depletion interaction is affected by the size ratio： the larger the size ratio is, the stronger the depletion effect will be. In addition, for the same size ratio, the depletion force will be further strengthened by the geometrical con- finement.