Comparison of the Composition and Structural Parameters of W/O Microemulsions Containing Gemini Imidazoliums with Those Containing Monomeric Analogues |
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Authors: | Jinling Chai Jingwei Song Dan Wang Haihui Chai Tingting Bai Ning Liu |
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Affiliation: | , College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China |
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Abstract: | The composition and structural parameters of W/O microemulsions containing the gemini surfactant 1,4‐bis(3‐alkylimidazolium‐1‐yl) butane bromide (Cn‐4‐Cn)Br2, n = 12, 14, 16] + pentan‐1‐ol + octane + water and W/O microemulsions containing the ionic liquid surfactant 1‐alkyl‐3‐methylimidazolium (CnmimBr, n = 12, 14, 16) + pentan‐1‐ol + octane + water were studied and compared. The mole fractions of the n‐alkyl alcohol at the interfacial layer in (Cn‐4‐Cn)Br2 based microemulsion systems are always larger than those in CnmimBr based microemulsion systems. However, the mole fractions of the n‐alkyl alcohol in the oil phase are nearly the same for both the microemulsion systems. The (Cn‐4‐Cn)Br2 based microemulsion systems have greater absolute values of the free enthalpy values than that for CnmimBr based systems. In the (Cn‐4‐Cn)Br2 based microemulsion systems, a large number of cosurfactants at the interfacial layer is conducive to the formation of a smaller droplet W/O microemulsion. The effects of n‐alkyl alcohols, alkanes, salinity and temperature on the composition and structural parameters of the (Cn‐4‐Cn)Br2 based and CnmimBr based microemulsion systems were also investigated and discussed. |
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Keywords: | Interfacial composition Structural parameter Microemulsion Dilution method Gemini imidazolium |
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