Periodic mesoporous hexane bridged silsequioxane (BPS) materials (consisting of hexane groups in the framework) were synthesized by the sol-gel method under basic conditions. Hexane BPS materials were synthesized by condensation of 1, 6 -bistriethoxysilylhexane (BESH). Cetyltrimethylammonium bromide (CTAB) and N-(3-trimethyl-ammoniumpropyl)hexadecylammonium dibromide (C16-3-1) were used as the structure-directing template. FTIR results confirmed the formation of hexane BPS materials and showed that the surfactant was removed by solvent extraction. Powder powder X-ray diffraction (XRD) and nitrogen adsorption data indicated that the mesophase and textural properties of the materials are dependent on the reaction conditions (i.e. ageing duration, ageing temperature, amount of silica precursor(s), et al). Cubic mesophases were identified using powder X-ray diffraction. When solvent xtraction is prolonged, the BET surface area and the pore volume increase, while the average pore diameter decreases. Materials with more dominant XRD structural features and larger d values, higher surface areas, lower pore volumes and average pore diameters are obtained when low ageing temperatures are used.

Effect of the reaction conditions on powder X-ray diffraction patterns and nitrogen adsorption of hexane BPS materials

246th National Meeting (2013)

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