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Aggregation behavior of long-chain imidazolium ionic liquids in ethylammonium nitrate

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Abstract

The aggregation behavior of long-chain imidazolium ionic liquids, 1-alkyl-3-methyl-imidazolium bromide (CnmimBr, n = 12, 14, 16) was studied by surface tension measurements in a room temperature ionic liquid, ethylammonium nitrate (EAN), at various temperatures. A series of parameters including critical micelle concentration (cmc), surface tension at the cmc (γ cmc), and the effectiveness of surface tension reduction (Πcmc) were obtained. In addition, from the cmc values and their temperature dependence, we estimated the thermodynamic parameters of the micelle formation, \( \Delta G_{\rm{m}}^0 \), \( \Delta H_{\rm{m}}^0 \), and \( \Delta S_{\rm{m}}^0 \). The contribution of enthalpy term to the micelle formation is superior to that of entropy term. 1H NMR was performed to study the CnmimBr micelle formation mechanism in EAN.

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Acknowledgment

The authors are grateful to the National Natural Science Foundation of China (No. 50972080, 20773081), National Basic Research Program (2007CB808004, 2009CB930101). This work was partially supported by the Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS.

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Authors and Affiliations

  1. Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, People’s Republic of China

    Wenpei Kang, Bin Dong, Yanan Gao & Liqiang Zheng

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  1. Wenpei Kang
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  2. Bin Dong
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  3. Yanan Gao
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  4. Liqiang Zheng
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Correspondence to Liqiang Zheng.

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Kang, W., Dong, B., Gao, Y. et al. Aggregation behavior of long-chain imidazolium ionic liquids in ethylammonium nitrate. Colloid Polym Sci 288, 1225–1232 (2010). https://doi.org/10.1007/s00396-010-2254-2

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  • DOI: https://doi.org/10.1007/s00396-010-2254-2

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