期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 467, 期 -, 页码 1-8出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.11.031
关键词
Gemini imidazolium surfactant; cmc; Thermodynamic parameter; Micropolarity; Aggregation
资金
- National Natural Science Foundation of China (NSFC) [51103179]
- Qingdao science and technology plan projects [14-2-4-7-jch]
- Fundamental Research Funds for the Central Universities [12CX02015A, 14CX02007A]
- SRF for ROCS, SEM
A novel class of Gemini imidazolium surfactants 1,3-bis(3-alkylimidazolium-1-yl) propane bromide [C-n-3-C(n)im]Br-2 (n = 8, 10, 12) were synthesized and characterized by FT-IR, H-1 NMR and elemental analysis. The surface activity and aggregation behavior of [C-n-3-C(n)im]Br-2 (n = 8, 10, 12) were investigated by surface tension, conductivity and steady fluorescence methods. A series of surface active parameters, including cmc, Gamma(max), pC(20), cmc/C-20, A(min), gamma(cmc) and Pi(cmc) were obtained from surface tension measurement. It was indicated that Gemini imidazolium surfactants with the longer alkyl chain showed the higher surface activity. The thermodynamic parameters of micellization process, namely, standard Gibbs free energy (Delta G(m)(O)), enthalpy (Delta H-m(O)) and entropy (Delta S-m(O)) were derived from conductivity measurement at different temperatures. The micropolarity and the mean aggregation number (N-agg) of micelles were evaluated from steady fluorescence spectra. The results revealed that the micropolarity and N-agg of micelles decreased with the increase of hydrocarbon chain length. (C) 2014 Elsevier B.V. All rights reserved.
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