Tailoring the microstructure of particle-stabilized wet foams

被引：180

作者：

Gonzenbach, Urs T. ^{[1
]}

Studart, Andre R. ^{[1
]}

Tervoort, Elena ^{[1
]}

Gauckler, Ludwig J. ^{[1
]}

机构：

[1] ETH, CH-8093 Zurich, Switzerland

来源：

LANGMUIR | 2007年 / 23卷 / 03期

关键词：

D O I：

10.1021/la0624844

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Inorganic colloidal particles which are in situ hydrophobized upon adsorption of short-chain amphiphilic molecules can be used as foam stabilizers. In this study, we tailor the microstructure of particle-stabilized wet foams, namely, the foam air content, average bubble size, and bubble size distribution, by changing the composition of the initial colloidal suspension. Wet foams featuring average bubble sizes between 10 and 200 mu m and air contents between 45% and 90% were obtained by adjusting the amphiphile and particle concentration, pH, ionic strength, and particle size in the initial suspension. The influence of these parameters on the bubble size was satisfactorily described in terms of a balance between the shear stress applied during mixing and the counteracting Laplace pressure of the air bubbles. This model, originally developed for oil droplets in emulsions, can therefore be used to deliberately tailor the microstructure of particle-stabilized wet foams.

引用

页码：1025 / 1032

页数：8

共 31 条

[1] Some general features of limited coalescence in solid-stabilized emulsions [J].