Langmuir behaviors of the complex of anionic and cationic surfactant at the air/water interface

The complexes of anionic and cationic surfactant were prepared by mixing a cationic surfactant (cetylpyridinium chloride (CPCl, C-16) with anionic surfactant ((sodium octyl sulfonate (OSS, C-8), sodium dodecyl sulfate (SDS, C-12), sodium tetradecyl sulfonate (TDSS, C-14), sodium dodecyl benzene sulfonate (SDBS, C-12)) having different alkyl chain lengths in 0.15 M NaCl aqueous solution. The behaviors of precipitates at the air/water interface were studied by surface-pressure-area isotherm, surface potential and Brewster angle microscopy (BAM), respectively. (C) 2001 Elsevier Science B.V. All rights reserved.