Temperature effect on the stability of bentonite colloids in water
2006 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 298, no 2, 694-705 p.Article in journal (Refereed) Published
The stability of natural bentonite suspensions has been investigated as a function of temperature at pH 9 and ionic strength 10-3 M. The sedimentation rate of the particles is directly related to their stability. The sedimentation kinetics was determined by examining the variation of particle concentration in solution with time. The observed kinetics for sedimentation is discussed quantitatively in terms of the potential energy between particles. The ζ-potential of the particles was measured and the DLVO theory was used to calculate attractive and repulsive potentials. Experimental observations are consistent with DLVO model predictions and show that the stability of bentonite colloids increases with temperature. Differences with other colloidal systems can be attributed to the temperature dependence of the surface charge of bentonite particles.
Place, publisher, year, edition, pages
2006. Vol. 298, no 2, 694-705 p.
Bentonite colloids, DLVO theory, PCS, Sedimentation, Zeta potential
IdentifiersURN: urn:nbn:se:kth:diva-7533DOI: 10.1016/j.jcis.2006.01.018ISI: 000237909100026ScopusID: 2-s2.0-33646374149OAI: oai:DiVA.org:kth-7533DiVA: diva2:12587
QC 201010012007-10-032007-10-032010-10-01Bibliographically approved