Liquid Crystal Templating Effects on Silica Gels Synthesized using Quaternary Ammonium Surfactants

ABSTRACTThe use of lyotropic liquid crystal phases is a promising tool in tailoring the porous structure of inorganic gels. In this work, we examine the effect of hexagonal liquid crystal phases produced with quaternary ammonium surfactants on the textural ordering of silica gels.The sol-gel polymerization of the silicon alkoxide precursor (tetramethoxysilane) is followed by 29Si NMR and rheological measurements. The structural evolution of the material from the starting sol to the thermally treated gel is studied using low angle X-ray diffraction. The textural characteristics of the gels are correlated with the nature of the surfactant molecules.