Abstract
Initial rates of alkali ion exchange from sodium trisilicate, potassium trisilicate, lithium disilicate, and several sodium aluminosilicate glasses were measured as a function of electrolyte concentration and pH (concentration scale) using pH-stat methods. For the alkali silicate glasses, rates of ion exchange were depressed in solutions of their respective alkali chlorides except near the isoelectric point (pH 2-3), where ion exchange rates in deionised water and in electrolytes were indistinguishable. Similar but smaller rate depressions were obtained for sodium aluminosilicate glasses in sodium chloride solutions. Trends in these initial rates were consistent with predictions of a model relating glass reaction kinetics to the surface concentration of hydrogen ions, which is a function of the electric surface potential at the glass/solution interface. Although not directly measurable, electric surface potentials were calculated as a function of electrolye concentration and pH using site-dissociation theory.
| Original language | English |
|---|---|
| Pages (from-to) | 140-148 |
| Number of pages | 9 |
| Journal | Physics and Chemistry of Glasses |
| Volume | 34 |
| Issue number | 4 |
| Publication status | Published - Aug 1993 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Ceramics and Composites
Cite this
Kinetics of alkali silicate and aluminosilicate glass reactions in alkali chloride solutions. Influence of surface charge. / Pederson, L. R.; McGrail, B. P.; McVay, G. L.; Petersen-Villalobos, D. A.; Settles, N. S.
In: Physics and Chemistry of Glasses, Vol. 34, No. 4, 08.1993, p. 140-148.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Kinetics of alkali silicate and aluminosilicate glass reactions in alkali chloride solutions. Influence of surface charge
AU - Pederson, L. R.
AU - McGrail, B. P.
AU - McVay, G. L.
AU - Petersen-Villalobos, D. A.
AU - Settles, N. S.
PY - 1993/8
Y1 - 1993/8
N2 - Initial rates of alkali ion exchange from sodium trisilicate, potassium trisilicate, lithium disilicate, and several sodium aluminosilicate glasses were measured as a function of electrolyte concentration and pH (concentration scale) using pH-stat methods. For the alkali silicate glasses, rates of ion exchange were depressed in solutions of their respective alkali chlorides except near the isoelectric point (pH 2-3), where ion exchange rates in deionised water and in electrolytes were indistinguishable. Similar but smaller rate depressions were obtained for sodium aluminosilicate glasses in sodium chloride solutions. Trends in these initial rates were consistent with predictions of a model relating glass reaction kinetics to the surface concentration of hydrogen ions, which is a function of the electric surface potential at the glass/solution interface. Although not directly measurable, electric surface potentials were calculated as a function of electrolye concentration and pH using site-dissociation theory.
AB - Initial rates of alkali ion exchange from sodium trisilicate, potassium trisilicate, lithium disilicate, and several sodium aluminosilicate glasses were measured as a function of electrolyte concentration and pH (concentration scale) using pH-stat methods. For the alkali silicate glasses, rates of ion exchange were depressed in solutions of their respective alkali chlorides except near the isoelectric point (pH 2-3), where ion exchange rates in deionised water and in electrolytes were indistinguishable. Similar but smaller rate depressions were obtained for sodium aluminosilicate glasses in sodium chloride solutions. Trends in these initial rates were consistent with predictions of a model relating glass reaction kinetics to the surface concentration of hydrogen ions, which is a function of the electric surface potential at the glass/solution interface. Although not directly measurable, electric surface potentials were calculated as a function of electrolye concentration and pH using site-dissociation theory.
UR - http://www.scopus.com/inward/record.url?scp=0027644258&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027644258&partnerID=8YFLogxK
M3 - Article
VL - 34
SP - 140
EP - 148
JO - Physics and Chemistry of Glasses
JF - Physics and Chemistry of Glasses
SN - 0031-9090
IS - 4
ER -