受限混合物溶剂中胶粒的耗尽势及吸附稳定性

基于密度泛函理论和Yvon-Born-Green方程得到了胶粒耗尽势的表达式.采用密度泛函理论计算了单壁附近和平行狭缝中的混合物溶剂中胶粒的耗尽势及其在单壁处的吸附稳定性.研究结果表明,不同溶剂组分的体积分数和粒子尺寸比等因素对胶粒耗尽势的强度、力程和周期均可产生显著影响,胶粒在单壁附近的吸附稳定性与溶剂粒子尺寸比和体积分数密切相关.此外,对受限于平行狭缝的胶体悬浮液,胶粒的耗尽势阱还可随粒子尺寸比和缝宽呈振荡趋势变化.

Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture

Based on density functional theory and Yvon-Born-Green equation, the expression for depletion potential was derived. The depletion potential and adsorption stability were calculated and investigated via density functional theory for the colloidal particles immersed in the solvent mixture, which was confined by a single wall and in slit pore. The results showed that the volume fraction and the size ratio of the solvents influence significantly the depletion potential in its strength, range and oscillation period. Moreover, the adsorption stability of the colloidal particle at the wall related closely to the volume fraction and size ratio of the solvents. In addition, for the colloidal suspension confined in slit pore, the depletion potential-well of a colloidal particle might show oscillation as the size ratio and the pore width were modulated.