Formation of SnO2 gels from dispersed sols in aqueous colloidal solutions
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Data
1990-05-01
Autores
Satoshi Hiratsuka, Renato [UNESP]
Helena Pulcinelli, Sandra [UNESP]
Valentim Santilli, Celso [UNESP]
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Resumo
Transparent SnO2 gels were obtained from SnCl4 aqueous solution. The sol formation from tin oxihydroxy peptization in different concentrations and by electrolyte addition in solution was measured. It was verified that the residual presence of chloride ions compromises the colloidal system stability. The sol-gel transition was investigated as a function of the quantity of solid particles in the aqueous environment and of aging time at 60°C by infrared spectroscopy and rheological measurements. The transition from plastic to pseudoplastic flow observed with the increase in loading suggests that a continuous and three-dimensional network formation is closely related to hydrogen bridges and/or hydrogen clusters, culminating in the gel formation. © 1990.
Descrição
Palavras-chave
Ammonia - Solutions, Colloid Chemistry - Phase Transitions, Colloids - Stability, Gels - Preparation, Tin Compounds - Gelation, Aqueous Colloidal Solutions, Dispersed Sols, Tin Chloride Oxidation, Tin Oxide Gel Formation, Tin Oxihydroxy Peptization, Transparent Tin Oxide Gels, Semiconducting Tin Compounds
Como citar
Journal of Non-Crystalline Solids, v. 121, n. 1-3, p. 76-83, 1990.