Synthesis of onion-like mesoporous silica from sodium silicate in the presence of α,ω-diamine surfactant |
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Authors: | Kazi-Zakir Hossain Abdelhamid Sayari |
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Affiliation: | aDepartment of Chemistry, University of Ottawa, 10 Marie Curie Street, Ottawa, Canada K1N 6N5 |
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Abstract: | Mesoporous silicas with vesicular and onion-like morphologies were assembled through hydrogen-bonding pathway from sodium silicate as silica source and electrically neutral α,ω-diamine, Jeffamine D2000 surfactant (H2NCH(CH3)CH2OCH2CH(CH3)]33NH2) as template in aqueous media at different synthesis temperatures (25, 60 and 100 °C). Assembling the material at 100 °C afforded onion-like core shell mesoporous silica, while at relatively lower temperature, e.g. 25 and 60 °C, multilamellar vesicles were obtained. Mesoporous silica with onion-like morphology was also obtained by a two-step synthesis involving an aging period of 20 h at room temperature followed by a hydrothermal stage (1–12 h) at 100 °C. The heavily cross-linked (Q4/Q3 ratio of 4.43) onion-like mesophase silica exhibited high hydrothermal stability. The BET surface area, pore volume and KJS (Kruk-Jaroniec-Sayari) pore diameter of the onion-like mesoporous silica were found to be 464 m2 g−1, 1.16 m3 g−1 and 7.2 nm, respectively. |
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Keywords: | Mesoporous silica Onion-like morphology α ω -Diamine surfactant Sodium silicate Hydrothermal stability |
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