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Type: Artigo de periódico
Title: Composite membrane of niobium(V) oxide and cellulose acetate: Preparation and characterization
Author: Campos, EA
Gushikem, Y
Abstract: Composite membranes of niobium(V) oxide and cellulose acetate (Cel/Nb2O5) were prepared with the following Nb2O5 loadings (in wt%): 1.1, 6.1, 9.8, 15.6, and 20.9. The thermal stability of the membranes slightly decreased in relation to the pure membrane on incorporation of the metal oxide into the matrix. Scanning electron microscopy and niobium mapping with an X-ray EDS microprobe showed that the metal oxide particles are homogeneously dispersed in the matrix. The electronic absorption bands indicated that the oxide particle size varies from that of the monomer to those of oligomer species on increased Nb2O5 loading in the matrix. The dispersed oxide possesses mainly Lewis acid character, a clear indication that on increasing the oxide loading in the matrix, the coordination number of the metal is not saturated by formation of the Nb-O-Nb bond. (C) 1997 Academic Press.
Subject: niobium oxide
cellulose acetate
niobium oxide-cellulose acetate composite membrane
niobium oxide dispersed in cellulose acetate
Editor: Academic Press Inc Jnl-comp Subscriptions
Rights: fechado
Identifier DOI: 10.1006/jcis.1997.5051
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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