Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 147, Issue 1, Pages 242-251Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2011.06.021
Keywords
Phase transition; Mesoporous silica structure; Surfactant alkyl chain length
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Funding
- DOE, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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In this study, silica-based mesoporous materials (the M41S family mesoporous molecular sieves) are synthesized using alkyltrimethylammonium bromide with different chain lengths (CnH2n+1N(CH3)(3)Br, n = 10, 12, 14, 16) as templates. The resulting silica structures are characterized by X-ray diffraction and are found to exhibit the phase transformation from the hexagonal rnesophase MCM-41 to the cubic mesophase MCM-48 (with the space group of Ia3d). The structural phase transition in our study is controlled by the alkyl chain length of the surfactant: with an increase in the surfactant chain length (from C10 to C16), the structure goes from MCM-41 (synthesized by C10), through an intermediate structure (synthesized by C12), to MCM-48 (synthesized by C14 and C16). The amount of ethanol, which is used as a cosolvent, affects the pore size of the structured mesoporous silica, but only to a small extent. In the mean time, the autoclaving time has some effect, though not distinctively, on the structure integrity as well. With increased surfactant to silica ratio, the phase transformation can be shifted to longer chain template. (C) 2011 Elsevier Inc. All rights reserved.
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