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Issue 27, 2018
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Small-angle X-ray scattering study on nano-scale structures controlled by water content in a binary water/ionic liquid system

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Abstract

We report the water-in-ionic-liquid microemulsions (ME) formed in a binary water/ionic liquid system, without organic solvents, using a surfactant ionic liquid (SAIL) based on 1-butyl-3-methylimidazolium (C4mIm+) as the cation and dioctyl sulfosuccinate (AOT) as the anion. Small-angle X-ray scattering (SAXS) revealed that MEs were stably formed in the binary water/SAIL solutions in the low water content region (water volume fraction, ϕw < 0.1), and the ME size systematically increased with increasing ϕw. We further investigated the nanostructures of the high ϕw region using a combination of SAXS and rheological measurements and found that the MEs changed to a stacked lamellar structure comprising SAIL bilayers and water phases at ϕw > 0.12. At the largest water content, ϕw = 0.99, vesicle structures were obtained.

Graphical abstract: Small-angle X-ray scattering study on nano-scale structures controlled by water content in a binary water/ionic liquid system

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Article information


Submitted
20 Jan 2018
Accepted
20 Jun 2018
First published
21 Jun 2018

Phys. Chem. Chem. Phys., 2018,20, 18355-18360
Article type
Paper

Small-angle X-ray scattering study on nano-scale structures controlled by water content in a binary water/ionic liquid system

K. Hashimoto, K. Fujii, T. Kusano, K. Hirosawa and M. Shibayama, Phys. Chem. Chem. Phys., 2018, 20, 18355 DOI: 10.1039/C8CP00440D

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