Journal
JOURNAL OF SURFACTANTS AND DETERGENTS
Volume 16, Issue 5, Pages 785-794Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11743-013-1449-1
Keywords
CMC; Counter-ion binding; Aggregation number; Hydrodynamic radius; Zeta potential; Energetics of micellization
Funding
- UGC, Government of India
- Indian National Science Academy
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Various micelle parameters viz., critical micelle concentration (CMC), counter-ion binding (beta), aggregation number (N), hydrodynamic radius (R (h)), micelle zeta potential (zeta) and energetic parameters, free energy of micellization (), enthalpy of micellization () and entropy of micelle formation () were determined for sodium dodecylsulfate, and dodecyltrimethylammonium bromide in the presence of NaCl for the former and NaBr for the latter. Conductometry and calorimetry methods were used for the measurements of CMC and energetic parameters. The fluorimetric (static quenching) method was employed to determine N and dynamic light scattering to estimate R (h) and zeta. The conductometrically determined beta was verified from the CMC values by calorimetry using the Corrin-Harkins equation. The results found for the two surfactants of identical tails but different head groups have been presented and discussed. A detailed report on the salt effect using salts containing counter-ions the same as those in the surfactant is found only limitedly in the literature.
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