Micellar and Surface Properties of Some Monomeric Surfactants and a Gemini Cationic Surfactant

Journal of Surfactants and Detergents - 2011
Santosh Kumar Verma1, Kallol K. Ghosh1
1School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India

Tóm tắt

Abstract

The physicochemical and interfacial properties of the monomeric surfactants cetyltrimethyl ammonium bromide (CTAB), cetyltriphenyl phosphonium bromide (CTPB), tetradecyl triphenyl phosphonium bromide (TTPB), cetyldiethylethanol ammonium bromide (CDEEAB), cetyltrimethyl ammonium chloride (CTACl), tetradecyltrimethyl ammonium bromide (TTAB), and a gemini surfactant (C16‐3‐C16, 2Br−) at different pH (3.1, 7.0, and 7.75) have been investigated by conductivity and surface tension measurements at 300 K. The critical micellar concentration (CMC), degree of micellar ionization (α), surface excess concentration (Гmax), minimum surface area per molecule of surfactant (Amin), Gibbs free energy of micellization (∆Gm0), surface pressure at the CMC (πCMC), and the Gibbs energy of adsorption (∆Gads0) of the monomeric surfactants have also been determined. The CMC, α and Гmax, increase with increasing pH whereas Amin decreases.

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Journal of Surfactants and Detergents

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