Interfacial Behavior of Catanionic Surfactants | Zendy

Antonio Stocco | Zendy; David Carrière | Zendy; Maximilien Cottat | Zendy; D. Langévin | Zendy

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Interfacial Behavior of Catanionic Surfactants

Author(s) -

Antonio Stocco,

David Carrière,

Maximilien Cottat,

D. Langévin

Publication year - 2010

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la100954v

Subject(s) - pulmonary surfactant , surface tension , chemistry , bubble , bromide , chemical engineering , chromatography , ion , nucleation , inorganic chemistry , thermodynamics , organic chemistry , biochemistry , physics , parallel computing , computer science , engineering

We report a dramatic increase in foam stability for catanionic mixtures (myristic acid and cetyl trimethylammonium bromide, CTABr) with respect to that of CTABr solutions. This increase was related to the low surface tension, high surface concentration, and high viscoelastic compression moduli, as measured with rising bubble experiments and ellipsometry. Dialysis of the catanionic mixtures has been used to decrease the concentration of free surfactant ions (CTA(+)). The equilibrium surface tension is reached faster for nondialyzed samples because of the presence of these free ions. As a consequence, the foamability of the dialyzed solutions is lower. Foam coarsening has been studied using multiple light scattering: it is similar for dialyzed and nondialyzed samples and much slower than for pure CTABr foams.

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