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Citation: LIU Xuefeng, CHEN Hui, TIAN Feifei, FANG Yun. Effect of Counter Ions on Self-assembly of Ionic Liquid 1-(2-Hydroxyethyl)-3-dodecylimidazolium Chloride in Aqueous Solutions[J]. Chinese Journal of Applied Chemistry, ;2013, 30(4): 431-435. doi: 10.3724/SP.J.1095.2013.20260 shu

Effect of Counter Ions on Self-assembly of Ionic Liquid 1-(2-Hydroxyethyl)-3-dodecylimidazolium Chloride in Aqueous Solutions

Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemistry and Material Engineering, Jiangnan University, Wuxi 214122, China

Received Date: 11 June 2012
Revised Date: 25 July 2012

The self-assembly of surface active ionic liquid 1-(2-hydroxyethyl)-3-dodecylimidazolium chloride([C₂OHC₁₂im]Cl) in aqueous solutions with various inorganic salts(NaX,X=Cl^-,Br^- and I^-,Na₂SO₄) has been investigated by surface tension method and fluorescence probe method,respectively. The critical micelle concentration(CMC) and average aggregation number(N_m) of[C₂OHC₁₂im]Cl changed remarkably in aqueous medium with the presence of counter ions. It is believed that the[C₂OHC₁₂im]⁺ monomers or micelles are combined with the counter ions to neutralize their surface charges. The order of the counter ions in altering the self-assembly parameters of[C₂OHC₁₂im]Cl in aqueous medium follows Cl^---4^2-. However, the effects of the category of counter ions on the critical aggregation number(N_m,c) and the micropolarity of micelle ([I₁/I₃]_m) were marginal. Along with the increase of the concentration of Br^-,the CMC decreases logarithmically and the N_m increases by an empirical power law.
- surface active ionic liquid,
- (hydroxyethyl)-dodecylimidazolium chloride,
- inorganic counter ion,
- self-assembly
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