Croatica Chemica Acta, Vol. 56 No. 4, 1983.
Conference paper
Electrochemistry/Colloid Chemistry Interaction: (a) Effect of Particle Size on Electrokinetic Phenomena and Coagulation; (b) Anodic Deposition of Colloidal Metal
Aieksandar R. Despić
; Faculty of Technology and Metallurgy, University of Beograd, Beograd, Yugoslavia
Abstract
Thermodynamic treatement of the problem of electrochemical
potential of metal particles in the colloidal range leads to a ·
conclusion that the latter depends on particle radius. This phenomenon
reflects also upon the electrokinetic potential of the colloids.
Hence, in a polydisperse system particles are at different zeta-
potential. The difference may be very significant towards the
lower limit of the colloidal range. A quantitative treatement based
on the Stern model of the electrical double layer shows the effect
to be the strongest around the pzc and subsides towards high positive
or negative potentials. As a result of this effect, the iso-electric
point, rate of coagulation and electrophoretic mobility are also dependent
on the particle radius.
Deposition of metal from colloidal solution has also been investigated
on the example of colloidal gold. It was shown that the
negatively charged gold particles deposit at the anode.
Keywords
Hrčak ID:
194201
URI
Publication date:
9.11.1983.
Visits: 681 *