Abstract
Synthesis and formation of hierarchical mesoporous silica network in acidic aqueous solutions of commercial sodium silicate and cationic surfactant were studied by SEM, TEM, XRD and nitrogen adsorption-desorption methods. The formation process occurs through several steps, involving (1) formation of mesoporous silica nanoparticles; (2) aggregation of mesoporous silica nanoparticles into blocks; (3) growth of silica nanorods in closely-packed arrays by merging of silica nanoparticles; (4) separation of the nanorods to form 3D silica network; and (4) shrinking of the mesoporous silica network. The as-prepared 3D silica network exhibits bimodal morphology constituting mesoporous and macroporous phases.
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