摘要:

Solutions representing a wide range of compositions in the aluminumsec‐butoxide‐water‐isopropyl alcohol system were prepared. Viscosity measurements were made on solutions hydrolyzed at 20°C, Large differences were observed between low‐water solutions and high‐water solutions, both in the time evolution of the viscosity and in the effect of isopropyl alcohol content on the viscosity. Higher values of viscosity were attributed to polycondensation of partially hydrolyzed species, while lower values of viscosity were attributed to hydrolyzed clusters. The reduced viscosity was independent of oxide content for low‐water solutions, but decreased with increasing oxide content for high‐w

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1988.tb05764.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Solutions representing a wide range of compositions in the aluminumsec‐butoxide‐water‐isopropyl alcohol system were prepared. Solutions were mixed at room temperature, then gelled and evaporated at 80°C. Regions within this system were distinguished where translucent gels formed instead of precipitates or powders. Translucent gels formed in compositions with high water content and high isopropyl alcohol content. The stages of sol‐gel process were investigated by Fourier transform infrared spectroscopy in the early stages and in gels before and after solvent evaporation. The microstructure was characterized by nitrogen sorption

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1988.tb05765.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY