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Type: Artigo de evento
Title: Corrosion Protection Of Fluorzirconate Glasses Coated By A Layer Of Surface Modified Tin Oxide Nanoparticles
Author: Hammer P.
Rizzato A.P.
Alvarez F.
Landers R.
Pulcinelli S.H.
Santilli C.V.
Abstract: The protection efficiency against water corrosion of fluorozirconate glass, ZBLAN, dip-coated by nanocrystalline tin oxide film containing the organic molecule Tiron® was investigated by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The chemical bonding structure of the surface region and morphology were studied before and after two water exposure periods of 5 and 30 min. The results of the analysis for the as-grown sample revealed a SnO1.6 phase containing carbon and sulfur, related to Tiron®, and traces of elements related to ZBLAN (Zr, F, Ba). This fact and the clear evidence of the presence of tin oxifluoride specie (SnOxF y) indicates a diffusion of the glass components into the porous coating. After water exposure, the increase of the oxygen concentration accompanied by a strong increase of Zr, F, Ba and Na content is interpreted as filling of the nanopores of the film by glass compounds. The formation of a compact protective layer is supported by the morphological changes observed by AFM. © 2005 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.tsf.2005.07.252
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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