Mais informações

Salvado, I. M. M. et al. Densification of SiO2-ZrO2 xerogels by addition of fresh sols before gelation. In: CONGRESSO BRASILEIRO DE CERÂMICA, 47., 2003, João Pessoa. Anais... João Pessoa, 2003.
Clique no nome do(s) autor(es) para ver o currículo Lattes:

Dados do autor na base InfoHab:
Número de Trabalhos: 1 (Nenhum com arquivo PDF disponível)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Dados do autor na base InfoHab:
Número de Trabalhos: 1 (Nenhum com arquivo PDF disponível)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Abstract

Vitreous samples with composition xZrO2 . (1-x) SiO2 with x= 10 mol% were prepared by sol-gel. Before gelation at 30?C or at 60?C a fresh sol with the same composition and experimental conditions of preparation was added to previously prepared sols. The time interval between additions and the number of additions was varied. After all additions the sols were left at 30?C or at 60?C until gelation occurred. After two weeks at the gelation temperature the obtained gels were dried at 120?C for 48 hours. The dried gels were then heat-treated for 5,5 hours at 850?C. It was found that the addition of fresh sols to an aged sol leads to densification of the resulting vitreous xerogel. The small angle scattering results showed that densification is due to the increase in the number density of the oxide regions developing in the sol.
-