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Paper
J. Mater. Chem., 2010, 20, 320 - 325, DOI: 10.1039/b916039f
One step room temperature synthesis of ordered mesoporous silica SBA-15 mediated by cellulose nanoparticles
Catherine Lawrence, Wim Thielemans and Robert Mokaya
Well ordered SBA-15 mesoporous silicas are prepared using a simple room temperature procedure made possible by the addition of small amounts of cellulose nanoparticles to a synthesis gel containing Si, water, ethanol, HCl, and P123 co-polymer. The presence of the cellulose nanoparticles enhances the level of silica condensation, in addition to improving the mesostructural ordering and results in SBA-15 materials with very low microporosity. The cellulose acts by reducing the solubility of the P123 co-polymer and also segregates the hydrophilic ethylene oxide segments of the co-polymer from the forming silica framework. These actions are conducive for the formation and phase separation of the P123–silica mesophase. Small amounts of cellulose-related organics are retained in the SBA-15 mesophase, although the pores are templated by P123 co-polymer.
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