Viscosity of polyelectrolytes solutions in nanofilms.
Viscosity of polyelectrolytes solutions in nanofilms.
复制标题
纳米膜中聚电解质溶液的粘度。
作者：
J. Delacotte;E. Rio;F. Restagno;C. Uzüm;R. von Klitzing;D. Langevin
我们使用薄膜压力天平来探测薄液膜的流变特性。这些膜由表面活性剂和聚电解质的混合水溶液制成。由于聚电解质网络的分层过程，它们在施加的压力下以不连续的方式排出。研究了不同表面活性剂稳定膜的分层动力学。使用一个理论模型，它是可能的，以检查局部耗散的表面活性剂和膜厚度的效果。一方面，观察到耗散仅取决于表面活性剂的浓度，而不管表面活性剂是中性的还是带有与表面活性剂相反的电荷。另一方面，有人发现，耗散是较强的薄膜。
We use a thin film pressure balance to probe the rheological properties of thin liquid films. These films are made from mixed aqueous solutions of surfactants and polyelectrolytes. They drain under applied pressure in a noncontinuous way due to a stratification process of the polyelectrolytes network. The stratification kinetics was studied for films stabilized by different surfactants. Using a theoretical model, it is possible to examine the effect of both the surfactant and the film thickness on the local dissipation. On one hand, it was observed that dissipation depends on the polyelectrolyte concentration only, regardless whether the surfactant is neutral or bears electric charges opposite to those of the polyelectrolyte. On the other hand, it was found that dissipation is stronger in thinner films.