Micellization behaviour and thermodynamic parameters of 12-2-12 gemini surfactant in (water plus organic solvent) mixtures
Küçük Resim Yok
Tarih
2011
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Academic Press Ltd- Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The effect of organic solvents on micellization behaviour and thermodynamic parameters of a cationic gemini (dimeric) surfactant, C12H25(CH3)(2)N+-(CH2)(2)-N+(CH3)(2)C12H25 center dot 2Br(-), (12-2-12) was studied in aqueous solutions over the range of T = (293.15 to 323.15) K using the conductometric technique. Ethylene glycol (EG), dimethylsulfoxide (DMSO) and 1,4-dioxan (DO) were used as organic solvents with three different contents. The critical micelle concentration (cmc) and the degree of counter ion dissociation (a) of micelles in the water and in the (water + organic solvent) mixtures including 10%, 20%, and 30% solvent contents were determined. The standard Gibbs free energy (Delta G degrees(m)), enthalpy (Delta H degrees(m)) and entropy (Delta S degrees(m)) of micellization were estimated from the temperature dependence of the cmc values. It was observed that the critical micelle concentration of the gemini surfactant and the degree of counter ion dissociation of the micelle increased as the volume percentage of organic solvent, and temperature increased. The standard Gibbs free energy of micellization was found to be less negative with the increase in the organic solvent content and temperature. (C) 2011 Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Gemini Surfactants, Micellization, Thermodynamic Properties, Conductometric Measurements, Ethylene-Glycol, Micelle Formation, Tetradecyltrimethylammonium Bromide, Mixing Behavior, Mixed Micelles, Chain-Length, Cloud Points, Head Group, Aggregation, Ethanol
Kaynak
Journal Of Chemical Thermodynamics
WoS Q Değeri
Q1
Scopus Q Değeri
Q2
Cilt
43
Sayı
9
