Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid

Kang, T.; Qian, S.; Smith, G. S.; Do, C.; Heller, W. T.

doi:10.1039/c7sm01516j

Title: Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid

Journal Article · 07 September 2017 · Soft Matter

DOI: https://doi.org/10.1039/c7sm01516j · OSTI ID:1399983

Kang, T. ^[1];

^[1]; Smith, G. S. ^[1];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division

Mixtures of water, octane and 1-octanol with 1-tetradecyl-3-methylimidazolium chloride (C14MIM·Cl), often referred to as a surface active ionic liquid (SAIL), form water-in-oil microemulsions that have potential application as extraction media for various metal ions. Here in this work, we present a structural study by small-angle neutron scattering (SANS) of dense microemulsions formed by surfactant-rich mixtures of these four compounds to understand how the SAIL can be used to tune the structures and properties of the microemulsions. The SANS experiments revealed that the microemulsions formed are composed of two phases, a water-in-oil microemulsion and a bicontinuous microemulsion, which becomes the dominant phase at high surfactant concentration. In this concentration regime, the surfactant film becomes more rigid, having a higher bending modulus that results from the parallel stacking of the imidazolium ring of the SAIL. At lower surfactant concentrations, the molecular packing of the SAIL does not change with the water content of the microemulsion. Finally, the results presented here correlate well with previously observed changes in the interaction between the IL cation and metal ions (Y. Tong, L. Han and Y. Yang, Ind. Eng. Chem. Res., 2012, 51, 16438–16443), while the capacity of the microemulsion system for water remains high enough for using the system as an extraction medium.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1399983

Journal Information:: Soft Matter, Vol. 13, Issue 39; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Mixing oil and water with ionic liquids: bicontinuous microemulsions under confinement Kim, Hojun; Han, Mengwei; Bandara, Sarith R. Soft Matter, Vol. 15, Issue 47 https://doi.org/10.1039/c9sm01649j	journal	January 2019

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