Lyotropic effect in surface charge,electrokinetics, and coagulation of a rutile dispersion |
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| Authors: | N Kallay M Čolić D W Fuerstenau H M Jang E Matijević |
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| Institution: | (1) Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia;(2) Department of Materials Science and Mineral Engineering, University of California, Berkeley, California, USA;(3) Present address: Center for Advanced Materials Processing, Clarkson University, Box 5814, 13699-5814 Potsdam, New York, USA |
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| Abstract: | Potentiometric, electrokinetic, and coagulation experiments with a rutile dispersion in the pH region above the point of zero charge exhibit an  inverse lyotropic sequence for counterions: Li+>K+>Cs+. The potentiometric and electrokinetic data were interpreted by a surface complexation model assuming the Stern-Gouy-Chapman structure of the interfacial layer, which yielded the values of inner layer capacitances,C, and the intrinsic equilibrium constants,K
ass
0
, characterizing the specificity of each counterion. These parameters were used to explain the order of lyotropic sequences in the adsorption, coagulation, and electrokinetic phenomena. |
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| Keywords: | Coagulation electrokinetics interfacial layer lyotropic effect rutile |
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