Studies on Structural, Thermal and Vibrational Behavior of Ionic Liquid confined in Ordered Mesoporous matrix

摘要

In the present study, immobilization of ionic liquid (IL) 1 -ethyl-3-methyl imidazolium tetrafluoroborate [EMIM][BF_4] into the pores of ordered mesoporous MCM-41 (Mobil Composition of Matter No. 41) has been accomplished successfully. The IL adsorbed on the surface of MCM-41 has been removed after washing. Glass transition temperature (Tg) has been found to change as compared to the bulk IL in confinement. SEM and TEM results confirm the removal of the surface adsorbed IL. BET study shows decrease in specific pore volume as amount of IL increases. Thermal stability of IL decreases in confinement due to the interaction between IL molecules and pore wall surface. FTIR study shows that the vibrational bands related to the ring of the IL cation and anion [BF_4] shift upon confinement due to the interaction with the pore wall surface.