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Mesoporous silicas functionalized with aminopropyl groups were synthesized by cocondensation of tetraethoxysilane (TEOS) and 3-aminopropyl triethoxysilane (APTES) and characterized by nitrogen adsorption-desorption measurements. The pore volume decreased drastically from about 900 mm 3 /g for the unfunctionalized mesoporous silica to about 300 mm 3 /g for the aminopropyl-functionalized mesoporous silica (1.65 mmol-NH 2 /g). This result was explained in terms of the surface density of the aminopropyl groups in the pore.