Article Dans Une Revue Materials Chemistry and Physics Année : 2008

SBA-15 synthesis: Are there lasting effects of temperature change within the first 10 min of TEOS polymerization?

Nancy Brodie-Linder
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Gilberte Dosseh
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Christiane Alba-Simonesco
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Fabrice Audonnet
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Résumé

Thermal treatments before and after precipitation during the synthesis of SBA-15 materials were studied. It was found that thermal treatments in a range of 28-55 °C during the first 10 min of TEOS polymerization had an effect on surface silanol groups and the amount of microporosity in the final SBA-15 materials. FTIR analysis of these obtained SBA-15 materials indicates that a change in the distribution of the type of surface silanol groups when the initial reaction temperature is raised to 55 °C occurs. The total pore volume was found to decrease with the increase of temperature which exhibits a decrease in microporosity. Post-synthesis grafting to replace silanol groups by OSi(CH3)3 groups was used as a micropore blocking device. This method seems to reply more realistically to the experimental results as compared to the αs plot method.

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Dates et versions

hal-04896825 , version 1 (20-01-2025)

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Nancy Brodie-Linder, Gilberte Dosseh, Christiane Alba-Simonesco, Fabrice Audonnet, Marianne Impéror-Clerc. SBA-15 synthesis: Are there lasting effects of temperature change within the first 10 min of TEOS polymerization?. Materials Chemistry and Physics, 2008, 108 (1), pp.73-81. ⟨10.1016/j.matchemphys.2007.09.007⟩. ⟨hal-04896825⟩
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