Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aaa56c
Keywords
ionic liquid; ordered mesoporous MCM-41; immobilization; N-2-sorption; DFT calculations
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Funding
- DST, New Delhi, India
- CSIR, New Delhi, India [23/12/2012(ii)EU-V]
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In this work, ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(fluorosulfonyl) imide ([ EMIM] [FSI]) has been immobilized into ordered mesoporous silica MCM-41 by a physical imbibition process. Transmission electron microscopy confirms the filling of mesopores of MCM-41. The effect of IL content in MCM-41 was probed in terms of thermal stability, chemical interactions, and dielectric properties. N-2-sorption results indicate the compression of the IL in the nanopores of MCM-41, which contributes to an increase of the melting point probed by differential scanning calorimetry. The quantum chemical calculations confirmed that the ion-ion interaction in ion-pairs of IL were preferred over the hydrogen bonding interaction in the presence of SiO2 molecules, and these interactions probably compress the molecular size in the nanopores of MCM-41. Strong interactions between IL and porous MCM-41 were suggested as the mechanism of this immobilization, which was characterized by FTIR and dielectric spectroscopy.
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