Foams stabilized by mixed cationic gemini/anionic conventional surfactants

被引:0
|
作者
Jianxi Zhao
Wensheng Zou
机构
[1] Fuzhou University,Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering
来源
Colloid and Polymer Science | 2013年 / 291卷
关键词
Gemini surfactant; Cationic/anionic surfactants; Foam stability; Salt effect;
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中图分类号
学科分类号
摘要
The mixed adsorption of a cationic gemini surfactant, ethanediyl-1,2-bis(dodecyldimethylammonium bromide) (abbreviated as 12-2-12), and an anionic conventional surfactant, sodium dodecyl sulfate (SDS), was examined using surface tension measurements. The viscoelastic properties of the mixed films were investigated by dilational interfacial rheology technique. The results showed that the addition of SDS promoted the close packing of adsorbed molecules at the interface, which increased the dilational elasticity of the mixed films. The stability of the foams was determined by the half-life of foam height collapse. The foams generated by 12-2-12/SDS mixtures were more stable than that formed by pure 12-2-12. In the presence of sodium bromide, the foam stability was further enhanced and the surfactant concentration required to attain the maximum effect in stabilizing foams was greatly reduced. The high foam stability could well relate to the high elasticity of the film.
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页码:1471 / 1478
页数:7
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