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

• Grant number: 96/04168-6
• Support Opportunities: Research Projects - Thematic Grants
• Start date: March 01, 1997
• End date: February 28, 2001
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Celso Valentim Santilli
• Grantee: Celso Valentim Santilli
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated research 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 - Verónica de Zea Bermudez | 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)