泡沫膜的稳定性与表面流变学：低频下的振荡气泡研究

Stability of foam films and surface rheology: an oscillating bubble study at low frequencies.

作者信息

Stubenrauch Cosima, Miller Reinhard

机构信息

Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Strasse 116, D-50939 Köln, Germany, and Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 1, D-14476 Golm, Germany.

出版信息

J Phys Chem B. 2004 May 20;108(20):6412-21. doi: 10.1021/jp049694e.

DOI:10.1021/jp049694e

PMID:18950129

Abstract

The dilational surface elasticity epsilon and the dilational surface viscosity eta of the two nonionic surfactants n-dodecyl-beta-d-maltoside (beta-C12G2) and tetraethyleneglycol-monodecyl ether (C10E4) were studied using the oscillating drop method. The experiments were carried out at different concentrations and frequencies with an accessible frequency range of 0.005-0.2 Hz. The results are discussed in the light of previous disjoining pressure measurements that demonstrated that the stability of thin liquid films cannot be explained solely by the magnitude of the surface forces. Indeed, a comparison of the results obtained for beta-C12G2 with those obtained for C10E4 reveals a correlation between the stability of the films and the surface dilational elasticity of the respective monolayers.

摘要

采用振荡滴法研究了两种非离子表面活性剂正十二烷基-β-D-麦芽糖苷（β-C12G2）和四甘醇单癸醚（C10E4）的扩张表面弹性ε和扩张表面粘度η。实验在不同浓度和频率下进行，可及频率范围为0.005 - 0.2 Hz。根据先前的分离压力测量结果对结果进行了讨论，这些测量结果表明，薄液膜的稳定性不能仅由表面力的大小来解释。事实上，将β-C12G2的结果与C10E4的结果进行比较，揭示了膜的稳定性与相应单分子层的表面扩张弹性之间的相关性。