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Ionic liquid-in-oil microemulsions.

Julian Eastoe¹, Sarah Gold, Sarah E Rogers

¹School of Chemistry, University of Bristol, UK. julian.eastoe@bris.ac.uk

Journal of the American Chemical Society

|May 19, 2005

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Ionic liquids like [bmim][BF4] can form stable nanodomains dispersed in oil using Triton-X100. Small-angle neutron scattering confirms these form ionic liquid-in-oil microemulsion droplets.

Area of Science:

Materials Science
Colloid and Surface Chemistry

Background:

Ionic liquids are versatile solvents with unique properties.
Dispersing ionic liquids in nonpolar media presents challenges.
Surfactants are key to stabilizing such dispersions.

Purpose of the Study:

To investigate the dispersion of ionic liquid nanodomains in cyclohexane.
To determine the role of nonionic surfactants in stabilizing these systems.
To characterize the resulting nanostructure.

Main Methods:

Phase stability studies.
Small-angle neutron scattering (SANS) measurements.
Analysis of SANS data for structural information.

Main Results:

Related Experiment Videos

Surfactant-stabilized nanodomains of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) were successfully dispersed in cyclohexane.
Phase stability was confirmed for these dispersions.
SANS data analysis indicated the formation of ionic liquid-in-oil microemulsion droplets.

Conclusions:

Nonionic surfactants like Triton-X100 can effectively stabilize ionic liquid nanodomains in nonpolar solvents.
Ionic liquid-in-oil microemulsions can be formed and characterized using SANS.
This work demonstrates a method for creating and studying novel microemulsion systems.