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Received August 28, 2015
Accepted January 25, 2016
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Ultrasonic preparation of mesoporous silica using pyridinium ionic liquid

Institute of Chemistry Timisoara of Romanian Academy, Laboratory of Inorganic Chemistry, Bv. MihaiViteazul, No. 24, RO-300223 Timisoara, Romania 1Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, POB 49 Budapest-1525, Hungary
Korean Journal of Chemical Engineering, March 2016, 33(3), 749-754(6), 10.1007/s11814-016-0021-x
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Abstract

Mesoporous silica matrices have been prepared via classic acid catalyzed and sono-catalyzed sol-gel routes. Tetramethoxysilan (TMOS) and methyl-trimethoxysilane (MTMS) were used as silica precursors, and N-butyl-3-methylpyridinium tetrafluoroborate ([bmPy][BF4]) was employed as co-solvent and pore template. The ionic liquid (IL) to silica mole ratio was varied between 0.007 and 0.07. Nitrogen adsorption-desorption and small-angle neutron scattering measurements were used to characterize the obtained materials. The ionic liquid played the role of catalyst that affected the formation of the primary xerogel particles, and changed the porosity of the materials. Ultrasound treatment resulted in microstructure change on the level of the colloid particle aggregates. In comparison with IL containing xerogels, the IL containing sonogels show increased pore diameter, bigger pore volumes and diminished surface areas.

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