Netz RR, Joanny JF
Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg, France Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Kantstrasse 55, 14513 Teltow, Germany.
Macromolecules. 1998 Jul 28;31(15):5123-41. doi: 10.1021/ma980115b.
We study theoretically the interaction of a polyampholyte chain with charged planes, cylinders, and spheres. Due to the random character of the charge distribution along the chain, a polyampholyte possesses a spontaneous dipole moment, which can interact favorably with charged objects. Depending on the charge strength of the object and the polyampholyte length and fraction of charged monomers, this attractive interaction can be strong enough to induce adsorption. The addition of salt weakens the trend to adsorption, but proves necessary to adsorb polyampholytes of the same net charge as the charged object in the case of planes and cylinders. Long polyampholytes form globules, for which the number of uncompensated charges and thus the spontaneous dipole moment is reduced. Nevertheless, globules can adsorb on charged objects via two pathways: they either adsorb as a whole, (intact globule), or they are dissolved into a coil state prior to adsorption. Applications to the complexation behavior of polyampholytes with stiff, rodlike polyelectrolytes and with charged microspheres or charged spherical micelles are given.
我们从理论上研究了聚两性电解质链与带电平面、圆柱体和球体之间的相互作用。由于沿链电荷分布的随机性，聚两性电解质具有自发偶极矩，它能与带电物体产生有利的相互作用。根据物体的电荷强度、聚两性电解质的长度以及带电单体的比例，这种吸引相互作用可能强到足以诱导吸附。盐的加入会减弱吸附趋势，但在平面和圆柱体的情况下，对于与带电物体具有相同净电荷的聚两性电解质来说，盐对于吸附却是必要的。长聚两性电解质会形成球状体，其未补偿电荷的数量以及自发偶极矩都会减小。然而，球状体可以通过两种途径吸附在带电物体上：它们要么作为一个整体吸附（完整球状体），要么在吸附前溶解成线圈状。文中给出了聚两性电解质与刚性棒状聚电解质以及与带电微球或带电球形胶束的络合行为的应用。
