Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland.
Phys Chem Chem Phys. 2011 Jul 28;13(28):12716-9. doi: 10.1039/c1cp20654k. Epub 2011 Jun 20.
Highly charged polyelectrolytes adsorbed on oppositely charged colloidal particles are investigated by electrophoresis and dynamic light scattering. The dependence of the adsorbed amount and of the hydrodynamic layer thickness on the molecular mass and the salt level is analyzed. The adsorbed amount increases with increasing salt level and decreases with increasing molecular mass. The hydrodynamic layer thickness is independent of the molecular mass at low salt levels, but increases with the molecular mass as a power law with an exponent 0.10 ± 0.01 at high salt. The same behavior was observed for different polyelectrolytes and substrates and therefore is suspected to be generic. Due to semi-quantitative agreement with computer simulations carried out by Kong and Muthukumar in 1998, the observed behavior is interpreted with conformational changes of single adsorbed polyelectrolyte chains.
通过电泳和动态光散射研究了带高电荷的聚电解质在带相反电荷的胶体颗粒上的吸附。分析了吸附量和流体力学层厚度对分子量和盐度的依赖性。吸附量随盐度的增加而增加，随分子量的增加而减小。在低盐度下，流体力学层厚度与分子量无关，但在高盐度下，它随分子量呈幂律增加，指数为 0.10±0.01。在不同的聚电解质和基底上观察到相同的行为，因此怀疑这是普遍存在的。由于与 Kong 和 Muthukumar 在 1998 年进行的计算机模拟的半定量一致，因此通过单个吸附聚电解质链的构象变化来解释观察到的行为。
