Different molar percentages of MPTES (3-MercaptoPropyl-
TriEthoxySilane) and TEOS (TetraEthyle OrthoSilicate) were cocondensed
at a constant reaction molar ratio of 0.12 CTAB:0.5
NaOH:1 SiO2:130 H2O. The MPTES/TEOS molar ratio in the synthesis
mixturewas less than 20 mol%. In a typical reaction, CTAB (0.8 g)was
dissolved in an alkaline solution consisting of 10 g of 1 M NaOH in
35.1 gH2O; 3.40 g and 0.4 g ofMPTES (10 mol%)were mixed together
and then added to the surfactant solution while stirring. After 40 s
(dilution delay),