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Colloidal components in solutions of alkali silicates
Chalmers University of Technology.
Chalmers University of Technology.
1987 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 115, no 1, p. 95-103Article in journal (Refereed) Published
Abstract [en]

The particle size of colloidal silica in 1 to 5 M SiO2 solutions of lithium, sodium, potassium, and cesium silicates in the ratio range 1.5-20 moles of SiO2 per mole of M2O was determined by reaction with molybdic acid and by Sears titration. The particle size increased from 1.0 to 4.5 nm with increasing ratio but did not depend on the type of alkali-metal cation. The amount of monomeric silicate ions decreased sharply with increasing ratio from 35% for ratio 2 to 2% for ratio 15 in 5 M SiO2 solutions. The polymeric particles were extracted into tetrahydrofuran or tertiary butylalcohol at pH 2, without changing the particle size, in yields which increased to more than 95% for the highest ratios. Previous dilution caused the particle size to grow in high-ratio solutions but to decrease in low-ratio solutions.

Place, publisher, year, edition, pages
1987. Vol. 115, no 1, p. 95-103
Identifiers
URN: urn:nbn:se:ltu:diva-7598Local ID: 5fb75310-a9dd-11de-8293-000ea68e967bOAI: oai:DiVA.org:ltu-7598DiVA, id: diva2:980488
Note
Upprättat; 1987; 20090925 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Sterte, Johan

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