Author:
Lyons JS,Furlong DN,Healy TW
Abstract
Electrophoresis and
streaming potential data are reported for crushed and sheet muscovite mica
respectively. For streaming potential measurements a newly designed radial flow
apparatus was used. Measurements on crushed mica show that both aluminium and silicon
leach out of the mica. Leached aluminium and silicon may readsorb
to confer increased positive and negative charge respectively on the mica.
Electrophoresis data indicate that leaching of aluminium occurs more rapidly
than of silicon. Aging experiments on sheet mica show leaching effects to be
much slower than on crushed mica. Streaming potential measurements on freshly
cleaved mica sheets showed that (i) the zeta-
potential depended strongly on electrolyte (KCl) concentration; (ii) the
zeta-potential was relatively independent of pH and (iii) monovalent
cations were adsorbed in the sequence H+ > Cs+ > K+
> Na+ > Li+, whilst Ca2+ adsorbed more
strongly than K+. It is proposed that the structure of the electrical
double layer at the mica/electrolyte interface results from the distribution of
all ions between the diffuse layer,
the Stern plane (hydrated) and more critically the lattice holes of the
silica-alumina basal plane.
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