Foams stabilized by mixed cationic gemini/anionic conventional surfactants

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 we...

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Bibliographic Details
Published in:Colloid and polymer science 2013-06, Vol.291 (6), p.1471-1478
Main Authors: Zhao, Jianxi, Zou, Wensheng
Format: Article
Language:English
Subjects:
Cationic
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Colloidal state and disperse state
Complex Fluids and Microfluidics
Elasticity
Emulsions. Microemulsions. Foams
Exact sciences and technology
Foams
Food Science
General and physical chemistry
Nanotechnology and Microengineering
Original Contribution
Physical Chemistry
Polymer Sciences
Sodium
Sodium bromides
Soft and Granular Matter
Stability
Surface chemistry
Surfactants
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Summary: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.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-012-2883-8