Corrosion Protection Of Fluorzirconate Glasses Coated By A Layer Of Surface Modified Tin Oxide Nanoparticles

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.50201/02/159498Blunden, S.J., Cusack, P.A., Hill, R., The Industrial Uses of Tin Chemicals (1985) Royal Soc. Chem.Chopra, K.L., Major, S., Pandya, D.K., (1983) Thin Solid Films, 102, p. 1Comyns, A.E., (1989) Fluoride Glasses, 27. , John Wiley & Sons ChichesterRizzato, A.P., Santilli, C.V., Pulcinelli, S.H., Massaddeq, Y., Hammer, P., Craievich, A., (2004) J. Non-Cryst. Solids, 348, p. 38Rizzato, A.P., Santilli, C.V., Pulcinelli, S.H., (2000) J. Sol-Gel Sci. Technol., 19, p. 811Rizzato, A.P., Pulcinelli, S.H., Santilli, C.V., Messaddeq, Y., (1999) J. Non-Cryst. Solids, 256-257, p. 154Rizzato, A.P., Santilli, C.V., Pulcinelli, S.H., Massaddeq, Y., Hammer, P., (2005) J. Sol-Gel Sci. Technol., 32, p. 155Prakash, S.S., Brinker, C.J., Hurd, A.J., Sudeep, M.R., (1995) Nature, 374, p. 439Poulain, M., Poulain, M., Brown, M., Lucas, J., (1975) Mater. Res. Bull., 17, p. 243Hiratsuka, R.S., Pulcinelli, S.H., Santilli, C.V., (1990) J. Non-Cryst. Solids, 121, p. 76Wagner, C.D., Naumkin, A.V., Kraut-Vass, A., Allison, J.W., Powell, C.J., Rumble Jr, J.R., (2004) NIST Standard Reference Database 20, Version 3.4, , http://srdata.nist.gov/xps/Pantano, C.G., Brow, R.K., (1988) J. Am. Ceram. Soc., 71, p. 57

N2 Adsorption Isotherms Study Of The Texture Changes In Silica Gel Modified By Organofunctional Groups

[No abstract available]151614501453Schmidt, H., (1989) Sol-gel Science and Technology, p. 61. , edited by M. A. Aegerter, M. Jafelicci Jr, D. F. Souza and E. D. Zanotto World Scientific, SingaporeSchmidt, H., Wolter, H., (1990) J. Non-Cryst. Solids, 121, p. 428Mackenzie, J.D., Chuny, Y.J., Hu, Y., (1992) J. Non-Cryst. Solids, 147-148, p. 271Vollet, D.R., Moreira, J.C., Kubota, L.T., Varela, J.A., Gushiken, Y., (1989) Colloid Surf., 40, p. 1Unger, K.K., Becker, N., Roumeliotis, P., (1976) J. Chromatogr., 125, p. 115Kithara, S., Takada, K., Sakata, T., Muraishi, H., (1981) J. Colloid Inlerf. Sci., 84, p. 519Prakash, S.S., Brinker, C.J., Hurd, A.J., Rao, S.M., (1995) Nature, 374, p. 439Dias Filho, N.L., Gushikem, Y., Rodrigues, E., Moreira, J.C., Polito, W.L., (1994) J. Chem. Soc., Dalton Trans., 9, p. 1493Dias Filho, N.L., Gushikem, Y., (1995) J. Molec. Struct. (Theochem), 335, p. 175Dias Filho, N.L., Gushikem, Y., Moreira, J.C., Polito, W.L., Rodrigues, E., (1994) J. Braz. Chem. Soc., 5, p. 53Barret, E.P., Joyner, L.G., Holenda, P.H., (1951) J. Amer. Chem. Soc., 73, p. 373Gregg, S.J., Sing, K.S.W., (1982) Adsorption, Surface Area and Porosity, , Academic Press, London, Ch. 5Avnir, D., Jaroniec, M., (1989) Langmuir, 5, p. 1431Moreira, W.C., Gushikem, Y., Nascimento, O.R., (1992) J. Colloid Interf. Sci., 150, p. 115Brinker, C.J., Sciierer, G.W., (1990) Sol-gel Science: the Physics and Chemistry of Sol-gel Processing, , Academic Press, New York, Ch. 1

Preparation of ceramic membranes from surface modified tin oxide nanoparticles

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