Journal
GELS
Volume 8, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/gels8060388
Keywords
ionic liquid; 1-butyl-3-methylimidazolium tetrafluoroborate; 1-butyl-3-methylimidazolium chloride; mesoporous silica; small-angle neutron scattering
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In this study, composite silica xerogels were synthesized using acid catalysis sol-gel method with ionic liquids as co-solvents, catalysts, and pore templates. The xerogels prepared with different ionic liquid templating agents exhibited variations in morphology and thermal behavior.
Composite silica xerogels were prepared via acid catalysed sol-gel route using tetraethoxysilan (TEOS) as silica precursor, and 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4] or 1-butyl-3-methylimidazolium chloride [BMIM][Cl] ionic liquids, used simultaneously as co-solvents, catalysts and pore templates, at various IL-to-silica ratios. Morphology of the xerogels prepared using the different IL templating agents were investigated using scanning electron microscopy (SEM), nitrogen sorption and small angle neutron scattering (SANS). The thermal behavior of the composites was analyzed by thermal gravimetry, whereas the compositions were checked by infrared spectroscopy and EDX. The differences in the morphology and thermal behavior of the composites due to the different IL additives were revealed.
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