Aerosol-generated mesoporous silicon oxycarbide particles

Abstract

Aerosol-generated mesoporous organosilica submicronic spheres have beenconverted into porous silicon oxycarbide (SiCO) glasses by pyrolysis at 1000 °C in aninert atmosphere. Spherical mesoporous particles obtained from acidic solutions ofl,2-bis(tri- ethoxysilyl)ethane and Pluronic® F127 structuring agent were characterizedby X-ray diffraction (XRD), transmission electron microscopy (TEM), N2adsorption/desorption, and multinuclear solid-state magic-angle spinning (MAS) NMR.These particles were then py- rolyzed at 1000 °C and transformed into a SiCO phaseas evidenced by 29Si MAS NMR, while TEM shows preserved mesoporosity,unfortunately difficult to access owing to the presence of an outer layer of dense silica.© 2009 IUPAC.