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Development of Know-How Involving the Sol-Gel Process aiming the Preparation of Ceramic Membranes and thin Layers

Grant number: 96/04168-6
Support type:Research Projects - Thematic Grants
Duration: March 01, 1997 - February 28, 2001
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Celso Valentim Santilli
Grantee:Celso Valentim Santilli
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Associated grant(s):00/14943-4 - Nanocrystals embedded in glass: mechanisms of formation and growth, AR.EXT
00/06952-3 - Effects of sulfur concentration and two-step thermal treatment on the formation and growth of cdte(1-x) SX nanocrystals in a glass matrix, AR.EXT
98/07028-6 - Veronica de Zea Bermúdez | University of Trás-os-Montes - Portugal, AV.EXT
+ associated grants 99/10929-8 - Formation by forced hydrolysis of collodal particles of hydrous iron oxide, AR.BR
99/06735-3 - Characterization of tin oxide based sol-gel coating on boresilicat glasses by X-ray reflectivity, AR.EXT
99/02509-9 - SAXS study of structural transformations in NiO porous xerogels, AR.EXT
99/03273-9 - Effect of chlorine ions on the smart thermo-optical behaviour of zyrconil aqueous colloids, AR.EXT
98/06814-8 - Luís Antônio Ferreira Martins Dias Carlos | University of Aveiro - Portugal, AV.EXT
98/11201-5 - Structural study of organic-inorganic materials prepared by the sol-gel procedure, AR.EXT
98/05687-2 - Glasses and transparent glass-ceramics in the teo2-nb2o5-(0.5li2o-0.5 K2O) system, AR.EXT
98/02491-0 - Structural and mechanical propiertes of zirconium: PMMA sol-gel systems, AR.EXT - associated grants

Abstract

The formation of metal (sn, zr and zn) oxides-based colloidal suspensions, gels and xerogels will be studied aiming to establish correlations between the condition of preparation and the structural, microstructural, electrical and optical characteristics of materials prepared via sol-gel. A systematic study of the colloidal suspensions formation, the sol-gel transition (specially the thermoreversible sol-gel transition involving zirconyl chloride aqueous solutions modified by complexing agents), the drying and xerogels sintering will be carried out. We propose to analyse the nucleation and growth processes involved in crystallization of monolithic xerogels and thin layers prepared by dip-coating or sleep-casting. Our goal is to establish the specific mechanisms involved in each step of the sol-gel process aiming to define routes for preparation material presenting chemical and physical properties adequate to technological applications like as: transparent electrodes, membranes for ultrafiltration, tension or current limiter and protective layers for glass and metal against corrosion. (AU)