Issue 41, 2015

Structure study of a microemulsion system with an ionic liquid

Abstract

We found that an ionic liquid (IL) with a long alkyl chain moiety, 1-tetradecyl-3-methylimidazolium chloride (C14MIM·Cl), forms a single crystal after the addition of octanol in an alkane solvent. But the solution exhibits a structural change after adding a small amount of water. An optically clear solution is found within limits, and it is stable for several months. Since the IL molecule has an amphiphilic property, it behaves as a surfactant in the microemulsion system. But the IL formed a single crystal rather than a lyotropic liquid crystalline structure, unlike a typical surfactant. Therefore, it is important to understand the structure of the microemulsion system. We used the small angle neutron scattering (SANS) technique to investigate the structure. The scattering intensity was analyzed using a spherical core–shell model with the Schultz size distribution, and a contrast matching method was used to study the internal structure. The structure of the solution is confirmed to be a water-in-oil microemulsion system, and the swelling law is obeyed in the microemulsion system.

Graphical abstract: Structure study of a microemulsion system with an ionic liquid

Article information

Article type
Paper
Submitted
07 Jul 2015
Accepted
21 Sep 2015
First published
06 Oct 2015

Phys. Chem. Chem. Phys., 2015,17, 27833-27839

Structure study of a microemulsion system with an ionic liquid

T. H. Kang, Y. Jeon and M. W. Kim, Phys. Chem. Chem. Phys., 2015, 17, 27833 DOI: 10.1039/C5CP03939H

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