Effects of temperature on the stability of colloidal montmorillonite particles at different pH and ionic strength
2009 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 43, no 1, 21-26 p.Article in journal (Refereed) Published
The effect of temperature at different pH and ionic strengths on the aggregation kinetics of colloidal montmorillonite particles in aqueous dispersions was investigated. For a given temperature and pH, the rate constant for aggregation increased with increasing ionic strength. At pH:54 the rate constant for colloid aggregation increased with increasing temperature, regardless of ionic strength. At pH 10 the aggregation rate constant decreased with increasing temperature as a general trend. In the intermediate pH interval, the aggregation rate constant apparently decreased with increasing temperature except at the highest ionic strength, where it increased with increasing temperature. The aggregation rate constant decreased at alkaline pH compared with the acidic pH range. This effect became more pronounced at higher ionic strengths and higher temperatures but could not be observed at 4 degrees C. These observations are in qualitative agreement with DLVO calculations taking temperature, pH and ionic strength into account.
Place, publisher, year, edition, pages
2009. Vol. 43, no 1, 21-26 p.
Montmorillonite dispersions, PCS, Surface potential, PZC, DLVO theory, Aggregation
IdentifiersURN: urn:nbn:se:kth:diva-7534DOI: 10.1016/j.clay.2008.07.011ISI: 000262658000004ScopusID: 2-s2.0-57649117108OAI: oai:DiVA.org:kth-7534DiVA: diva2:12588
QC 20100910. Original titel "Effect of pH and temperature on the stabiligy of bentonite colloid".2007-10-032007-10-032010-09-10Bibliographically approved