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An Unusual Variation of Surface Tension with Concentration of Mixed Cationic-anionic Surfactants

✍ Scribed by Jin-Xin Xiao; Yan-Xia Bao

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
218 KB
Volume
19
Category
Article
ISSN
0256-7660

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✦ Synopsis

Abstract

There are two platforms in the surface tension vs. concentration curve (γ‐lg__C__ curve) of cationic‐anionic surfactant mixtures. The first platform is the same as that of common surfactant solution, and the cross point is the CMC. After the CMC, the mixtures form precipitate. At higher concentration, the mixtures form homogeneous solution again. When the mixtures form homogeneous solution at high concentration, surface tension increases with concentration, then becomes constant. So the γ‐lg__C__ curve exhibits the second platform. The surface tension at the second platform increases by increasing molar ratio of two surfactants and polar group size of surfactants, and decreases with adding inorganic salts.

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