Adsorption of Soluble Silica Species on Alumina Powders and Vice Versa
Abstract
In an effort to texture a glass surface with alumina particles, we found that positively charged alumina particles were only attracted to the negatively charged silica substrates in aqueous solution for a very short period although the pH was between the iso-electric-point (IEP) of alumina and silica. Instead, experiments show that the glass surface attracted the dissolved species of alumina, which made the surface repel the alumina particles. It was observed that the IEP of the glass, which was exposed to the supernatant of centrifuged alumina particles, shifted toward the IEP of alumina: the magnitude of the shift depended on the concentration of the dissolved alumina, and vice versa for the IEP of the alumina exposed to a supernatant formed with glass powder. Therefore after a short exposure to an alumina slurry, the glass surface look' look like alumina, and the electrostatic attraction between glass and alumina particles will no longer exist.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 06, 2004
- Accession Number
- ADA425021
Entities
People
- Biao Liu
- Carl D Meinhart
- Fred F. Lange
- Xiaojun Liu
Organizations
- University of California, Santa Barbara