Abstract
An aqueous phase behavior was investigated for ionic liquid-related cationic gemini surfactant, [C12im-4-C12im][Br2], in which two dodecylimidazolium parts are linked by a spacer composed of four methylene units. Differential scanning calorimetry was used to detect phase boundaries among various phases, from which a temperature−composition (T−X) phase diagram was constructed. Lyotropic liquid-crystalline phases appearing in this mixture were characterized by means of polarized optical microscopy. It was revealed that (1) two types of liquid-crystalline phases, lamellar (\( {{\hbox{L}}_\alpha } \)) and hexagonal (H1), are formed; (2) H1 phase coexists with micellar solution (L1) over a wide concentration range from a few wt.% to ca. 80 wt.% of the surfactant; and (3) the hydrated solid with the composition of [C12im-4-C12im][Br2]·2H2O exhibits incongruent melting point at which the hydrated solid decomposes into H1 phase and unhydrated surfactant solid.
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Acknowledgements
The work was supported by the National Natural Science Foundation of China (No. 20773081, 20873074), National Basic Research Program (2007CB808004, 2009CB930101), and Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS.
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Zhang, S., Yuan, J., Ma, H. et al. Aqueous phase behavior of ionic liquid-related gemini surfactant revealed by differential scanning calorimetry and polarized optical microscopy. Colloid Polym Sci 289, 213–218 (2011). https://doi.org/10.1007/s00396-010-2333-4
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DOI: https://doi.org/10.1007/s00396-010-2333-4