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Thermodynamics of Micellization of Sulfobetaine Surfactants in Aqueous Solution
Author(s) -
Cheng Chengjie,
Qu Guangmiao,
Wei Jijun,
Yu Tao,
Ding Wei
Publication year - 2012
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/s11743-012-1374-8
Subject(s) - chemistry , thermodynamics of micellization , aqueous solution , enthalpy , micelle , critical micelle concentration , alkyl , thermodynamics , surface tension , sulfonate , atmospheric temperature range , organic chemistry , physics , sodium
The thermodynamics of micellization of the sulfobetaine (SB) amphoteric surfactants, that is N ‐alkyl‐ N , N ‐dimethyl‐3‐ammonio‐1‐propanesulfonate and N ‐alkyl‐ N , N d‐imethyl‐3‐ammonio‐1‐butanesulfonate (the carbon atom number of the alkyl chain is 12, 14 and 16 respectively) in aqueous solution, have been studied by surface tension measurements with the temperature range from 298.15 to 318.15 K. The critical micelle concentrations (CMC) of SB n‐3 and SB n‐4 surfactants were determined from the drop‐volume methods at different temperatures. The obtained results indicated that the values of critical micelle concentration strongly depended on the surfactants species and temperatures. Thermodynamic parameters ( G mic ∘ , H mic ∘ and S mic ∘ ) of the micelle formation were determined. The micellization was found to be enthalpy‐driven at lower temperatures, while this process was entropy‐driven at higher temperatures. The enthalpy–entropy compensation were also investigated. The compensation temperature T c and H mic ⃰ decreased, while S mic ⃰ increased with the increase in the hydrophobic chain length.