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Scanning electron microscopic images of ordered mesoporous silica synthesized with different concentrations of cetyltrimethyl ammonium bromide (w/w). (A) 0.5%, (B) 0.8%, (C) 1.0%, (D) 1.5%, and (E) 3%; and (F) transmission electron microscopic image of ordered mesoporous silica with 0.8% cetyltrimethyl ammonium bromide.
