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Influence of NaCl/urea on the aggregation behavior of dodecyltrimethylammonium chloride and sodium dodecyl sulfate at varying temperatures and compositions: Experimental and theoretical approach
Author(s) -
Mahbub Shamim,
Rub Malik Abdul,
Hoque Md. Anamul,
Khan Mohammed Abdullah
Publication year - 2019
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.3917
Subject(s) - chemistry , mole fraction , sodium dodecyl sulfate , micelle , activity coefficient , pulmonary surfactant , critical micelle concentration , gibbs free energy , flory–huggins solution theory , aqueous solution , sodium , thermodynamics , inorganic chemistry , chromatography , organic chemistry , biochemistry , physics , polymer
Aggregation behavior of the anionic surfactant sodium dodecyl sulfate (SDS) and the cationic surfactant dodecyltrimethylammonium chloride (DTAC) has been studied by conductivity measurement in aqueous/urea/NaCl medium. The deviation of experimentally executed critical micelle concentration ( cmc ) from their respective ideal values ( cmc id ) signifies the interaction between the studied surfactants. The experiments were performed at different temperatures in order to estimate different thermodynamic parameters. The negative values of Gibbs free energy (Δ G m o ) point out the feasibility of the micellization behavior of the mixed systems as well as validate the feasibility of SDS‐DTAC interactions. The micellar mole fraction ( X 1 ) and the activity coefficients ( f 1 and f 2 ) on the basis of different proposed model (Rubingh, Motomura, & Rodenas) and ideal mole fraction ( X id ) were estimated, and obtained results illustrate the high contribution of DTAC in the mixed micellization, which exacerbates with the increase of the mole fraction of the DTAC. The interaction parameter ( β ) has also been investigated to get detailed insights of the interactions between the surfactants by concerning theoretical model proposed by Rubingh. The Δ G ex values were attained to be negative at all α 1 and temperatures, showing that mixed micelles are more stable than micelles of individual surfactants.