One-step preparation of thiol-modified mesoporous silica spheres with various functionalization levels and different pore structures
作者： Fabrice O. M. Gaslain , Cyril Delacôte , Alain Walcarius , Bénédicte Lebeau
DOI: 10.1007/S10971-008-1845-6
关键词:
摘要: A wide range of mercaptopropyl-functionalized silica spherical particles MCM-41 and MCM-48 (M41S family) have been prepared by co-condensation mercaptopropyl trimethoxysilane (MPTMS) or triethoxysilane (MPTES) tetraethoxysilane (TEOS) precursors in hydroalcoholic medium the presence a cationic surfactant as templating agent ammonia catalyst. It was possible to control mesostructure type (hexagonal cubic) monitoring water-to-ethanol ratio organoalkoxysilane precursor employed. Materials displaying various functionalization levels were obtained varying MPTMS MPTES contents from 3 50% synthesis medium. This gave rise porous solids with approximately same particle size morphology but featuring different degrees structural order. They characterized X-ray diffraction (XRD), N2 adsorption-desorption isotherms BET analysis, scanning transmission electron microscopy, 29Si 13C solid state nuclear magnetic resonance (NMR), distribution measurements, elemental chemical analysis. Mercaptopropyl groups readily incorporated high yields (>90%) route. All samples exhibited similar both level ordering porosity found decrease when increasing amount organo-functional groups.
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