title: Two steps bulk-surface functionalization of nanoporous alumina by methyl and vinyl-silane adsorption. Evidence for oxide surface highly reactive sites creation.
abstract: Functionalization of a novel nanoporous monolithic alumina synthesized from amalgam is investigated. The structure is studied by X-ray diffraction, BET, MEB and IR spectroscopy, before and after chemical functionalization by trimethylethoxy silane adsorption and annealing at high temperature. These treatments retain both monolith microstructure and nanostructure while strongly improving material mechanical properties. Allyldimethoxysilane and alcohol adsorption on the annealed samples, proves that highly reactive sites are available for further polymer grafting, as demonstrated by a significant shift of allyldimethoxysilane ν(SiH) to 2,215 cm(-1) and adsorbed acetate formation. Simple quantum computations on model systems support this conclusion. Chemical processes reported in this paper, allow a nanostructured alumina monoliths functionalization to optimize ceramics-polymer bonds, and to tune new hybrid biomaterial properties.
authors: College d'Odontologie Garanciere Universite Denis Diderot, 5 rue de Garanciere, 75006, Paris, France. cazevedo@yahoo.com
authors: Christophe
authors: C
authors: Azevedo
authors: Pierre
authors: P
authors: Cenedese
authors: Pierre
authors: P
authors: Dubot
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D001672:Biocompatible Materials; D000431:Ethanol; D006358:Hot Temperature; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods
chemical_list: D001672:Biocompatible Materials; D012821:Silanes; D000431:Ethanol; D000537:Aluminum Oxide; D012825:Silicon