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Micellar and Surface Properties of Some Monomeric Surfactants and a Gemini Cationic Surfactant
Author(s) -
Verma Santosh Kumar,
Ghosh Kallol K.
Publication year - 2011
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-010-1237-0
Subject(s) - chemistry , ammonium bromide , pulmonary surfactant , bromide , phosphonium , critical micelle concentration , gibbs free energy , cationic polymerization , inorganic chemistry , monomer , ammonium , surface tension , ammonium chloride , adsorption , gibbs isotherm , polymer chemistry , micelle , organic chemistry , aqueous solution , polymer , biochemistry , physics , quantum mechanics
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 (C 16 ‐3‐C 16 , 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 (Г max ), minimum surface area per molecule of surfactant ( A min ), Gibbs free energy of micellization (∆ G m 0 ), surface pressure at the CMC ( π CMC ), and the Gibbs energy of adsorption (∆ G ads 0 ) of the monomeric surfactants have also been determined. The CMC, α and Г max , increase with increasing pH whereas A min decreases.