EFFECT OF NEUTRAL POLYMERS ON ELECTROKINETIC POTENTIAL OF CELLS AND OTHER CHARGED-PARTICLES .2. MODEL FOR EFFECT OF ADSORBED POLYMER ON DIFFUSE DOUBLE-LAYER
EFFECT OF NEUTRAL POLYMERS ON ELECTROKINETIC POTENTIAL OF CELLS AND OTHER CHARGED-PARTICLES .2. MODEL FOR EFFECT OF ADSORBED POLYMER ON DIFFUSE DOUBLE-LAYER
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DOI：
10.1016/0021-9797(73)90414-1
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发表时间：
1973-01-01
影响因子：
9.9
通讯作者：
BROOKS, DE
中科院分区：
文献类型：
--
作者：
BROOKS, DE
提出了一个模型的zeta电位增加时，经常观察到的细胞和其他带电粒子悬浮在中性聚合物溶液。用Flory-Huggins理论计算了吸附聚合物对粒子表面双电层中抗衡离子化学势的影响。用高分子吸附项修正了玻尔兹曼方程。导出了表面附近的电位分布的表达式。在吸附的中性聚合物的存在下，双电层预计将扩大由于广义排除体积效应。因此，如果表面电荷保持不变，表面电位就会增加。在聚合物的存在下的相对zeta电位的表达式获得作为一个函数的（i）的吸附项，成比例的表面和体相之间的聚合物浓度的差异，（ii）的吸附层的深度，（iii）剪切平面的位置，和（iv）体离子强度。只要剪切平面不从颗粒表面移动得太远，则预测在吸附的中性聚合物存在下zeta电位会增加。
A model is proposed for the zeta potential increase frequently observed when cells and other charged particles are suspended in neutral polymer solutions. Flory—Huggins theory is used to calculate the effect of adsorbed polymer on the chemical potential of counterions in the double layer adjacent to the particle surface. The Boltzmann equation is obtained modified by a polymer adsorption term. An expression for the potential distribution near the surface is derived. In the presence of adsorbed neutral polymer the double layer is predicted to expand due to generalized excluded volume effects. The surface potential, therefore, increases if the surface charge remains constant. An expression for the relative zeta potential in the presence of polymer is obtained as a function of (i) an adsorption term, proportional to the difference in polymer concentration between the surface and bulk phases, (ii) the depth of the adsorbed layer, (iii) the location of the shear plane, and (iv) the bulk ionic strength. So long as the shear plane is not shifted too far from the particle surface, the zeta potential is predicted to be increased in the presence of adsorbed neutral polymer.