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

Abstract

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 enoughmore » for using the system as an extraction medium.« less

Authors:
 [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1399983
Grant/Contract Number:  
[AC05-00OR22725]
Resource Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
[ Journal Volume: 13; Journal Issue: 39]; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Kang, T., Qian, S., Smith, G. S., Do, C., and Heller, W. T. Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid. United States: N. p., 2017. Web. doi:10.1039/c7sm01516j.
Kang, T., Qian, S., Smith, G. S., Do, C., & Heller, W. T. Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid. United States. doi:10.1039/c7sm01516j.
Kang, T., Qian, S., Smith, G. S., Do, C., and Heller, W. T. Thu . "Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid". United States. doi:10.1039/c7sm01516j. https://www.osti.gov/servlets/purl/1399983.
@article{osti_1399983,
title = {Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid},
author = {Kang, T. and Qian, S. and Smith, G. S. and Do, C. and Heller, W. T.},
abstractNote = {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.},
doi = {10.1039/c7sm01516j},
journal = {Soft Matter},
number = [39],
volume = [13],
place = {United States},
year = {2017},
month = {9}
}

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