کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
76783 49149 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Periodic bifunctional organosilicas synthesised using cationic supramolecular templating
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Periodic bifunctional organosilicas synthesised using cationic supramolecular templating
چکیده انگلیسی

Bifunctional periodic mesoporous organosilicas containing –CH2–CH2– and –CHCH– bridges have been synthesised via direct synthesis using cationic surfactant templates. The mesoscopic ordering of the products was confirmed using powder X-ray diffraction and nitrogen adsorption. The local structure of mesocomposites was probed via 13C and 29Si solid-state NMR methods. The application of 1H–13C and 1H–29Si CP/MAS NMR dynamics revealed a complex structure of hybrid walls; organic bridges with different mobilities have been identified. The component with fast CP/MAS kinetics represents organic bridges in the bulk of the pore walls, while the component with slow CP/MAS NMR kinetics is attributable to the organic bridges on the hybrid wall interface. 1H–29Si CP/MAS dynamics also indicates that both bridges are incorporated into the same hybrid framework. The strength of template-framework interactions depends on the nature of incorporated organic bridges.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 106, Issues 1–3, 1 November 2007, Pages 236–245
نویسندگان
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