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Critical Scattering in Room-Temperature Ionic Liquid–Propanol Solutions

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Abstract

Critical scattering, derived from the phase separation of room-temperature ionic liquid (RTIL)–propanol solutions, was observed by small- and wide-angle X-ray scattering (SWAXS). The RTILs were 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, [Cnmim][TFSI] (n = 2–8). Critical scattering of the [C2mim][TFSI]–propanol system was enhanced in a propanol-rich region and corresponded to liquid–liquid equilibria in the mixture. The propanol isomer effect was obtained from a correlation length that represents fluctuations in density. By SWAXS, RTIL–propanol solutions had a prepeak that indicates nanoheterogeneity, and two kinds of fluctuation coexisted in the RTIL–propanol system.

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Acknowledgements

We thank Dr. T. Takekiyo and Prof. Y. Yoshimura of the National Defense Academy for helpful discussion. Also, we appreciate Prof. N. Hamaya of Ochanomizu University for experimental supports.

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  1. Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, 239-8686, Japan

    Hiroshi Abe, Fumiya Nemoto & Shinichiro Ozawa

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  1. Hiroshi Abe
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Correspondence to Hiroshi Abe.

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10953_2021_1051_MOESM1_ESM.docx

Fig. S1 Raw SWAXS data of [C2mim][TFSI] -92 mol% 1-propanol with a Kapton windows and b glass capillary. c Raw SWAXS data of pure 1-propanol with Kapton windows. Backgrounds without samples are expressed by solid curves. Electronic supplementary material 1 (DOCX 165 kb)

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Abe, H., Nemoto, F. & Ozawa, S. Critical Scattering in Room-Temperature Ionic Liquid–Propanol Solutions. J Solution Chem 50, 220–231 (2021). https://doi.org/10.1007/s10953-021-01051-0

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