Nanosized Mesoporous Silica Coatings on Ceramic Foams: New Hierarchical Rigid Monoliths

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• 作者：Lenin Huerta ; Jamal El Haskouri ; David Vie ; Maria Comes ; Julio Latorre ; Carmen Guillem ; M. Dolores Marcos ; Ramó ; n Mart&iacute ; nez-Mañ ; ez ; Aurelio Beltrá ; n ; Daniel Beltrá ; n ; Pedr
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：March 6, 2007
• 年：2007
• 卷：19
• 期：5
• 页码：1082 - 1088
• 全文大小：798K
• 年卷期：v.19,no.5(March 6, 2007)
• ISSN：1520-5002

文摘

Silica-based rigid monoliths exhibiting a trimodal hierarchical pore system have been successfullyprepared through coating of a ceramic foam (CF) with sub-micro-/nanometric mesoporous particles (asbuilding blocks). We have selected a bimodal porous silica, denoted as UVM-7 (a nanometric version ofthe well-known MCM-41 materials), consisting of small aggregates of nanometric surfactant-assistedmesoporous particles. A colloidal suspension of this material in water is used to coat through successiveimpregnation cycles the CF surface. The small intraparticle mesopore system (with pore diameters around2-3 nm) is due to the supramolecular templating effect of the surfactant. Textural large-mesopores/macropores (in the 20-70 nm range) have their origin in the interparticle UVM-7 voids. The largemacrocellular macropores are due to the CF support. The resulting monoliths present a good andhomogeneous coverage level. Moreover, these composites display better mechanic properties than thoseof related silica self-supported monoliths.