Interactions of ionic liquids with anionic clays

I&EC 138

Marino Xanthos, xanthos@njit.edu1, Neung Hyun Kim1, and Sanjay V. Malhotra, malhotra@njit.edu2. (1) Otto H. York Department of Chemical Engineering, New Jersey Institute of Technology, University Heights, Newark, NJ 07102, (2) Department of Chemistry and Environmental Science, New Jersey Institute of Technology, University Heights, Newark, NJ 07102
In attempts to prepare nanofillers with enhanced compatibility with a polymer matrix, synthetic hydrotalcite, a layered double hydroxide clay susceptible to exchange of its interlamellar carbonate ions with a variety of other anions, was selected. Reagents having anions differing in size and structure included two ionic liquids ([Epty] + [BF4]- and [Epty]+ [CF3COO]-) and a pH color indicator, bromothymol blue. Results with “as received” hydrotalcite indicated no exchange with the ionic liquids from aqueous solution as confirmed by FTIR, EDX, WAXS, elemental analysis and TGA. However, anion exchange did occur with calcined hydrotalcite (after removal of carbonate ions and water), which was “reconstituted” in the presence of aqueous solutions of the same ionic liquids. Ion exchange also took place with the much larger anion of bromothymol blue resulting in colored clay. WAXS indicated a significant increase of interlamellar spacing as a result of intercalation, depending on the anion size.
 

Ionic Liquids: Not Just Solvents Anymore OR Ionic Liquids: Parallel Futures (Sponsored by Green Chemistry and Engineering, Separation Science and Technology and Novel Chemistry with Industrial Applications Sub-Divisions)
8:00 PM-10:00 PM, Sunday, 26 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster

Division of Industrial and Engineering Chemistry

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006