Micelle formation of long-chain imidazolium ionic liquids in aqueous solution measured by isothermal titration microcalorimetry

Fei Geng; Jie Liu; Liqiang Zheng; Li Yu; Zhen Li; Ganzuo Li; Chenho Tung

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Micelle formation of long-chain imidazolium ionic liquids in aqueous solution measured by isothermal titration microcalorimetry

Fei Geng 1,Jie Liu 2,Liqiang Zheng 1,Li Yu 1 * #,Zhen Li 1,Ganzuo Li 1,Chenho Tung 3

1.Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education

2.Department of Chemistry, Liaocheng University

3.Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences

*Correspondence author

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Funding: 国家自然科学基金,山东省自然科学基金（重点）,教育部博士点基金（新教师基金）（No.20773081,Z2007B03,070422047）

Opened online:19 February 2009

Accepted by: none

Citation: Fei Geng,Jie Liu,Liqiang Zheng.Micelle formation of long-chain imidazolium ionic liquids in aqueous solution measured by isothermal titration microcalorimetry[OL]. [19 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29278

Self-association of three long-chain imidazolium ionic liquids (ILs), C12mimBr, C14mimBr and C16mimBr in aqueous solution was studied by surface tension measurements at different temperatures. Effects of temperature and hydrocarbon chain length of the three long-chain ILs on the critical micelle concentration (CMC) were examined. Thermodynamic parameters, Gibbs free energy, enthalpy and entropy of micellization were determined by applying a mass-action model equation. Isothermal titration microcalorimetry was used to obtain the enthalpy change upon micellization of the three long-chain ILs at 25℃. Moreover, the CMCs and the thermodynamic parameters were determined based on the isothermal titration microcalorimetry results.

Keywords:Long-chain imidazolium ionic liquids;Surface tension;Isothermal titration microcalorimetry;Micellization;Thermodynamic parameters

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