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Micellization Studies of Dicationic Gemini Surfactants (m‐2‐m Type) in the Presence of Various Counter‐ and Co‐Ions
Author(s) -
Aslam Jeenat,
Siddiqui Umme Salma,
Ansari Wajid Husain
Publication year - 2013
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/s11743-013-1453-5
Subject(s) - chemistry , micelle , critical micelle concentration , inorganic chemistry , thermodynamics of micellization , aqueous solution , ammonium bromide , alkyl , ammonium , hofmeister series , activity coefficient , conductometry , adsorption , counterion , ion , aggregation number , bromide , organic chemistry , pulmonary surfactant , biochemistry
Salts have the ability to influence the water activity and self‐association of ionic micelles. In the present case, gemini surfactants; ethanediyl‐α,ω‐bis(dimethyl alkyl ammonium bromide) (referred to as m‐ 2 ‐m, m = 10, 12, 14) are synthesized and their micellization study in aqueous medium in presence of monovalent inorganic (NaBr, NaNO 3 , NaCl, KCl, LiCl) and organic salts (NaTos, NaBenz, NaSal) at 303 K is systematically investigated by conductometric and tensiometric methods. All the salts have the tendency to lower the critical micelle concentration of the surfactants. The effect of inorganic salts on the micellization properties has been found to obey the Hofmeister series. Organic salts reduce the CMC more effectively as compared to inorganic salts. The theoretical models of Rubingh and Rosen have been used to compare the results and obtain the interaction parameters, minimum area per molecule, surface excess, mixed micelle composition, activity coefficients and free energies of micellization/adsorption.