Data of small-angle neutron scattering from colloidal aggregates of silicon tetraethoxide (TEOS) in basic ethanol/water solutions are presented. Changes in the structure of the aggregates were followed for different H 2O:TEOS molar ratios (w) within the interval from 0.5 to 10. Two scattering levels are detected. The first one (< 10nm) corresponds to the diffusive surface of the aggregates whose characteristics change with w-ratio. The second level reflects the formation of large secondary associations, which have a fractal dimension decreasing monotonously from 2.2 to 1.0 with increasing w-ratio.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering