Kleshchanok Dzina, Lang Peter R
Forschungszentrum Jülich, Institut für Festkörperforschung, Weiche Materie, 52425 Jülich, Germany.
Langmuir. 2007 Apr 10;23(8):4332-9. doi: 10.1021/la062607k. Epub 2007 Mar 10.
Total internal reflection microscopy (TIRM) was applied to measure the interaction potential between charge-stabilized polystyrene latex spheres and a glass wall in dependence on the concentration of additional poly(ethylene oxide). The influence of the polymer can be described by steric repulsion between polymer layers, which are physically adsorbed onto the surfaces of the polystyrene sphere and the glass wall. The expected attractive contribution to the potential due to polymer depletion was not observed. An increase of the polymer bulk concentration is shown to strengthen the steric repulsion. At the highest polymer concentrations studied, it is possible to accurately describe the experimental data for the steric contribution to the total interaction potential with the Alexander-de Gennes model for brush repulsion.
全内反射显微镜（TIRM）被用于测量电荷稳定的聚苯乙烯胶乳球与玻璃壁之间的相互作用势，该相互作用势取决于额外聚环氧乙烷的浓度。聚合物的影响可以通过聚合物层之间的空间排斥来描述，这些聚合物层物理吸附在聚苯乙烯球和玻璃壁的表面上。未观察到聚合物耗尽对势的预期吸引贡献。结果表明，聚合物本体浓度的增加会增强空间排斥。在所研究的最高聚合物浓度下，利用亚历山大 - 德热纳刷排斥模型可以准确描述空间效应对总相互作用势贡献的实验数据。
