Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33888

OpenURL Link
Title
Zeta potentials and yield stresses of silica suspensions in concentrated monovalent electrolytes: isoelectric point shift and additional attraction
Author/Creator
Franks, George V.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
The zeta potentials and yield stresses of silica suspensions were measured over a wide range of monovalent electrolyte concentrations. The counterions investigated were Li⁺, Na⁺, K⁺, and Cs⁺, while the co-ion was always Cl⁻. The poorly hydrated ions (Cs⁺ and K⁺) adsorb in greater quantity to the silica surface than the well-hydrated ions (Li⁺ and Na⁺) and produce lower magnitude negative zeta potentials at high pH. At high electrolyte concentrations and at low pH the poorly hydrated counterions adsorb in great enough quantity to reverse the sign of the zeta potential from negative to positive. This specific adsorption of counterions shifts the iep to higher values. The shift in the iep is directly related to the hydration of the counterion with the least hydrated ions creating the greatest iep shift. The yield stresses of silica suspensions at high pH were found to increase in the order Li⁺
Relation
Journal of Colloid and Interface Science Vol. 249, Issue 1, p. 44-51
Publisher Link
http://dx.doi.org/10.1006/jcis.2002.8250
Date
2002
Publisher
Academic Press Inc.
Keyword(s)
silica;  isoelectric point;  zeta potentials;  yield stress;  monovalent ions;  ion correlations;  additional attractive force;  Hofmeister series
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33888
Identifier
ISSN:0021-9797
Reviewed
Reviewed
26 Visitors 28 Hits 0 Downloads
Save/E-mail Citation
Citation Format
E-mail Address
Subject
"Journal of Colloid and Interface Science"
 
OR