Premium
Mixed Micellization Study of Alkyltrimethylammonium and Alkyltriphenylphosphonium Bromides in Aqueous Solution
Author(s) -
Padasala Shailesh,
Kanoje Bharatkumar,
Kuperkar Ketan,
Bahadur Pratap
Publication year - 2016
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/s11743-015-1780-9
Subject(s) - chemistry , pulmonary surfactant , critical micelle concentration , surface tension , micelle , aqueous solution , thermodynamics of micellization , flory–huggins solution theory , cationic polymerization , gibbs isotherm , analytical chemistry (journal) , chromatography , thermodynamics , organic chemistry , biochemistry , physics , polymer
Mixed micellization study of cationic surfactants viz. alkyltrimethylammonium bromides (C n TAB) and alkyltriphenylphosphonium bromides (C n TPPB) with similar hydrophobic groups (C 12 ‐, C 14 ‐, and C 16 ‐) was performed using tensiometry and UV–visible light spectrophotometry techniques. Critical micelle concentration (CMC) values of the single and binary surfactant mixtures were obtained from a plot of surface tension versus the logarithm of surfactant concentration ( C s ). The degree of synergy and various mixed micelle parameters like interaction parameter ( β ), activity coefficients ( f m ) and interfacial parameters like surface pressure ( π CMC ), packing parameter (P), surface excess concentration ( Г max ), surface tension at the CMC ( γ CMC ), and minimum area per molecule ( A min ) were evaluated using the regular solution theory (RST). Thermodynamic parameters were calculated using several proposed models which suggest the mixed micellar system to be more thermodynamically stable than their respective individual components. In addition, a dye solubilization study was performed using a spectrophotometric method to validate the CMC data obtained from tensiometric method. Conductometric measurements were also carried out for the mixture of C 12 TAB + C 12 TPPB only as it showed a more negative β, indicating a higher degree of synergism.