Micellar and Surface Properties of Some Monomeric Surfactants and a Gemini Cationic Surfactant |
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Authors: | Santosh Kumar Verma Kallol K Ghosh |
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Affiliation: | (1) School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India; |
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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 (A
min), Gibbs free energy of micellization (∆G
m0), surface pressure at the CMC (π
CMC), and the Gibbs energy of adsorption (∆G
ads0) of the monomeric surfactants have also been determined. The CMC, α and Гmax, increase with increasing pH whereas A
min decreases. |
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Keywords: | |
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