Huang Haohao, Manciu Marian, Ruckenstein Eli
Department of Chemical Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA.
J Colloid Interface Sci. 2003 Jul 1;263(1):156-61. doi: 10.1016/s0021-9797(03)00070-5.
Double-layer and hydration interactions have been coupled into a single set of equations because both are dependent on the polarization of the water molecules. The coupled equations involve the electric fields generated by the surface charge and surface dipoles, as well as the field due to the neighboring dipoles in water. The dipoles on the surface are generated through the counterions' binding to sites of opposite charge. The equations obtained were employed to explain the restabilization observed experimentally at large ionic strengths for colloidal particles on which protein molecules were adsorbed. Polar molecules adsorbed on a charged surface of colloidal particle can generate a field either in the same direction as that generated by the charge or in the opposite direction. The effect of the sign of the dipole of the adsorbed polar molecules on the interaction between surfaces was also examined.
双层相互作用和水合相互作用已被合并到一组方程中，因为两者都依赖于水分子的极化。耦合方程涉及由表面电荷和表面偶极子产生的电场，以及水中相邻偶极子产生的场。表面上的偶极子是通过反离子与相反电荷位点的结合而产生的。所得到的方程被用于解释在大离子强度下实验观察到的吸附了蛋白质分子的胶体颗粒的再稳定化现象。吸附在胶体颗粒带电表面上的极性分子可以产生一个与电荷产生的场方向相同或相反的场。还研究了吸附的极性分子偶极子的符号对表面间相互作用的影响。
