Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9778120 | Journal of Non-Crystalline Solids | 2005 | 5 Pages |
Abstract
The structure of sodium silicate solutions can be described as colloidal dispersion or sol. A dispersion of pyrogenic SiO2 or Al2O3 particles (size: 10-15 nm) in NaOH solutions can also be addressed as sol. Both types of sols were dried at temperatures between 40 and 100 °C to amorphous solids. Dried sodium silicate solutions remained transparent during the whole drying process when access of CO2 is avoided. Dried pyrogenic silica dispersions remained amorphous for shorter drying periods (up to 14 d). After longer drying periods (up to 90 d) crystallization and cracking was observed. The thermal analysis of both types of silicatic materials revealed transition effects typical of a glass transition.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hans Roggendorf, Dorit Böschel,