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Method of making ionic liquid mediated sol-gel sorbents

United States Patent

9,555,394
January 31, 2017
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Ionic liquid (IL)-mediated sol-gel hybrid organic-inorganic materials present enormous potential for effective use in analytical microextraction. One obstacle to materializing this prospect arises from high viscosity of ILs significantly slowing down sol-gel reactions. A method was developed which provides phosphonium-based, pyridinium-based, and imidazolium-based IL-mediated advanced sol-gel organic-inorganic hybrid materials for capillary microextraction. Scanning electron microscopy results demonstrate that ILs can serve as porogenic agents in sol-gel reactions. IL-mediated sol-gel coatings prepared with silanol-terminated polymers provided up to 28 times higher extractions compared to analogous sol-gel coatings prepared without any IL in the sol solution. This study shows that IL-generated porous morphology alone is not enough to provide effective extraction media: careful choice of the organic polymer and the precursor with close sol-gel reactivity must be made to ensure effective chemical bonding of the organic polymer to the created sol-gel material to be able to provide the desired sorbent characteristics.
Malik; Abdul (Tampa, FL), Shearrow; Anne M. (Lithia, FL)
University of South Florida (Tampa, FL)
14/ 046,302
October 4, 2013
STATEMENT OF GOVERNMENT INTEREST This invention was made with government support under Grant #DGE 0221681 awarded by the National Science Foundation, and Grant #DE-AC05-00OR22750 awarded by the Department of Energy. The government has certain rights in the invention.