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Type: Artigo de periódico
Title: Anisotropic self-organization of hybrid silica based xerogels containing bridge positively charged 1,4-diazoniabicycle[2.2.2]octane chloride group
Author: Arenas, LT
Pinheiro, AC
Ferreira, JD
Livotto, PR
Pereira, VP
Gallas, MR
Gushikem, Y
Costa, TMH
Benvenutti, EV
Abstract: Anisotropic self-organized hybrid silica based xerogels were obtained. The ordered structure was imposed by the double charged 1,4-diazoniabicycle[2.2.2]octane chloride group bonded in a bridged way. This was confirmed by the presence of well defined X-ray diffraction peaks corresponding to an interplanar distance with the same length estimated for the organic bridged groups. The material was characterized by elemental analysis using CHN technique and the chloride ion was analyzed by a potentiometric titration. C-13 and Si-29 CP MAS solid state NMR spectroscopy and thermogravimetric analysis were also performed. The material that can be obtained in the form of powders and transparent monoliths or films, is thermally stable up to 260 degrees C and the samples with high organic content presented birefringence properties. (c) 2007 Elsevier Inc. All rights reserved.
Subject: nanostructured material
organofunctionalyzed silica
Country: EUA
Editor: Academic Press Inc Elsevier Science
Citation: Journal Of Colloid And Interface Science. Academic Press Inc Elsevier Science, v. 318, n. 1, n. 96, n. 102, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2007.09.073
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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