Interaction between cationic and conventional nonionic surfactants in the mixed micelle and monolayer formed in aqueous medium

Química Nova

Nabel A. Negm¹  Ahmad M. El Sabagh¹ 

[1] ,Egyptian Petroleum Research InstituteCairo,Egypt

关键词: mixed micelles;    regular solution theory;    interaction parameter;   

DOI  :  10.1590/S0100-40422011000600018

来源: SciELO

【 摘 要 】

Mixed micellization and surface properties of cationic and nonionic surfactants dimethyl decyl-, tetradecyl- and hexadecyl phosphineoxide mixtures are studied using conductivity and surface tension measurements. The models of Rubingh, Rosen, and Clint, are used to obtain the interaction parameter, minimum area per molecule, mixed micelle composition, free energies of mixing and activity coefficients. The micellar mole fractions were always higher than ideal values indicating high contributions of cationics in mixed micelles. Activity coefficients were less than unity indicating synergism in micelles. The negative free energies of mixing showed the stability of the surfactants in the mixed micelles.

【 授权许可】

CC BY-NC   
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