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Effect of cooling rate on self-assembly structure of 12 hydroxystearic acid in ionic liquids

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Document pages: 8 pages

Abstract: We studied the effects of cooling rate on the self-assembly structure, mechanical and electrochemical properties of 12-hydroxystearic acid (12-hsa) in ionic liquid (IL) and 1-allyl-3-butyl imidazole bis (trifluoromethylsulfonyl) imide ([ABIM] [TFSI]). The mixture of 12-HSA and [ABIm][TFSI] has an upper critical solution temperature (UCST) higher than that of the sol gel transition temperature, and the cooling rate of the ionic gels significantly affects the microstructure of the ionic gels. The self assembled structure was formed in the slow cooling process at 0.4 degree C min, and the spherical domain induced by liquid-liquid separation and radiation fiber structure was observed in the quenching gel. Real time measurement of laser small angle X-ray scattering (SAXS)the ionogel during a slow cooling process at a rate of 0.4°C min presented three different (001) peaks arising from long spacings of 46.5, 42.4, and 39.7 Å, which were also observed for SAXS curves of a neat 12-HSA. These results suggest that three polymorphic forms of 12-HSA are formed in the IL. The polymorphic form significantly affected the mechanical properties of the ionogel, whereas it did not affect the ionic conductivity. The ionic conductivity of the ionogel was close to that of a neat [ABIm][TFSI] irrespective of the polymorphic forms of 12-HSA.

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