Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 511, Issue -, Pages 91-104Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2016.09.054
Keywords
Cationic/anionic surfactants; Critical micelle concentration; Salt effect; Dissociated Margules model; 1-propanol
Categories
Funding
- National Natural Science Foundation of China [21576077, 21076069]
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The mixed micellization of four cationic/anionic surfactant aqueous systems formed by quaternary ammonium bromide surfactants with different molecular structures and sodium dodecylsulfonate (Na+AS) at 318.15 K have been investigated. The dissociated Margules model has been used to model the nonideal mixed micellization. The gemini quaternary ammonium bromide (12-3-122+.2Br-) and Na+AS aqueous mixed system shows the strongest synergism. The effect of added salt constituted by surfactant counterions on the mixed micellization of the gemini quaternary ammonium surfactant and alkali dodecylsulfonate with various counterions in aqueous solution at 318.15 K has been explored. When gemini surfactant is in excess, the specific counterion effect becomes insignificant. Whereas, when alkali dodecylsulfonate is in excess, the counterion effect of K+ is stronger than that of Na+. The effect of 1-propanol on the mixed micellization of the 12-3-122+.2Br/Na+AS/H2O system at 318.15 K has also been explored. Different from the nonmonotonic behavior of the single ionic surfactants, the critical micelle concentration (cmc) of the mixed systems increases with the increase of the concentration of added 1-propanol in the 1-propanol water mixed medium. (C) 2016 Elsevier B.V. All rights reserved.
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