School of Information and Engineering, Guangdong Medical College, Zhanjiang 524023, PR China.
Phys Chem Chem Phys. 2013 Aug 7;15(29):12227-34. doi: 10.1039/c3cp51212f. Epub 2013 Jun 17.
By considering the mechanism of preferential adsorption, we systemically investigated the charging behavior of spherical particles in nonpolar media by the regulation of charged inverse micelles. Using the nonlinear Poisson-Boltzmann equation, we simulated the effects of micelle concentrations, particle concentrations, and particle sizes on the surface potential of spheres at the thermodynamic equilibrium of the system. As a result, we found two different micelle concentration-dependent regions for the surface potential of spheres which can be explained in terms of the mechanism of preferential adsorption and the electrostatic properties of charged reverse micelles between the particle surface and the double layer. Additionally, similar results were observed in an experiment for studying zeta potential of colloidal particles dispersed in AOT (sodium di-2-ethylhexyl sulfosuccinate)-dodecane solution.
通过考虑优先吸附的机制，我们系统地研究了通过调节带电反胶束来改变非极性介质中球形颗粒带电行为。利用非线性泊松-玻尔兹曼方程，我们模拟了胶束浓度、颗粒浓度和颗粒尺寸对系统热力学平衡时球体表面电位的影响。结果发现，球形颗粒的表面电位存在两个不同的胶束浓度依赖区域，可以用优先吸附机制和颗粒表面与双层之间带电反胶束的静电特性来解释。此外，在研究分散在 AOT（二-2-乙基己基琥珀酸磺酸钠）-十二烷溶液中的胶体颗粒的 ζ 电位的实验中也观察到了类似的结果。
