Study of structural surface modified tin oxide membrane prepared by sol-gel route sintered at 400 degrees C
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Data
2003-01-01
Autores
Santos, LRB
Belin, S.
Briois, V
Santilli, Celso Valentim [UNESP]
Pulcinelli, Sandra Helena [UNESP]
Larbot, A.
Título da Revista
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Editor
Kluwer Academic Publ
Resumo
This work describes the chemical modification by Tiron(R) molecules of the surface of SnO2 nanoparticles used to prepare nanoporous membranes. Samples prepared with Tiron(R) content between 1 and 20 wt% and fired at 400 C were characterised by X-Ray Powder Diffraction (XRPD), Extended X-ray Absorption Fine Structure (EXAFS), N-2 adsorption isotherms analysis and permeation experiments. XRPD and EXAFS results show a continuous reduction of crystallite size by increasing the Tiron(R) contents until 7.5 wt%. The control exercised by Tiron(R) modifying agent in crystallite growth allows the fine tuning of the average pore size that can be screened from 0.4 to 4 nm as the amount of grafted molecules decreases from 10 to 0 wt%. In consequence, the membrane cut-off can be screened from 1500 to 3500 g.mol(-1).
Descrição
Palavras-chave
ceramic membranes, surface modification, ultrafiltration, porosity
Como citar
Journal of Sol-gel Science and Technology. Dordrecht: Kluwer Academic Publ, v. 26, n. 1-3, p. 171-175, 2003.