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|Type:||Artigo de periódico|
|Title:||Exploring The Functionalization Ratio Of Mesoporous Silica Glass With Imidazolium Entities On The Synthesis Of Supported Gold Nanoparticles Nanostructured Materials 2012. Special Issue Editors: Juan Manuel Rojo, Vasileios Koutsos|
Da Costa L.P.
|Abstract:||This study describes the surface modification of porous Vycor glass ® (PVG®) with ionic species based on 1-methyl-imidazolium groups, and the posterior utilization of the functional porous substrate to synthesize supported gold nanoparticles (Au NPs). The functionalization degree (amount of imidazolium groups per gram of PVG ®) was successfully controlled by the concentration of the imidazolium-based alkoxysilane in the reaction media. The ion-exchange properties of the functional groups allowed an effective and homogeneous upload of AuCl4 - throughout the monolithic PVG® structure, with subsequent conversion to Au NPs by thermal treatment at 823 K, which also eliminated the organic groups chemically bonded to the surface. The amount of adsorbed AuCl4 - ions was shown to have influence on loading of the Au NPs while no size variation is observed, indicating that the porous environment of PVG® acts as a nanoreactor where the particles are formed in the confined space. © 2013 Springer Science+Business Media Dordrecht.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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