Relationship between surface dilational properties and foam stability

被引：136

作者：

Fruhner, H ^{[1
]}

Wantke, KD ^{[1
]}

Lunkenheimer, K ^{[1
]}

机构：

[1] Max Planck Inst Colloids & Interfaces, D-12489 Berlin, Germany

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2000年 / 162卷 / 1-3期

关键词：

foam stability; oscillating bubble method; surface dilational properties; surface dilational viscosity; surface rheology;

D O I：

10.1016/S0927-7757(99)00202-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The knowledge of the stability of foams and emulsions is very important for the control of a large number of technological processes. However, in spite of much intense research, the mechanism of foam stability is still not completely clear. Foam stability depends on many parameters but the type of the added surfactant and the surface rheological properties of the adsorption layers play the most important role. Because of the lack of reliable surface rheological data a comprehensive investigation of this problem was not yet possible. However, we can now present measurements of surface dilational properties of soluble adsorption layers in a frequency range of 1-500 Hz using a new version of the oscillating bubble method. The results are compared with measurements of foam stability. This indicates that the surface dilational viscosity plays an important role in the stability of foam films. A direct relation between surface dilational elasticity values and foam stability could not be detected for the examined systems. Pure elastic adsorption layers were not able to stabilize foam lamellas. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：193 / 202

页数：10

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