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Electrokinetics of Glass Surfaces. I. Charge Densities at the Solid/Gas and the Solid/Liquid Interfaces of Porous Glasses

J. Jednačak ; Electrochemistry Laboratory, »Ruder Boskovic« Institute, 41000 Zagreb, Croatia, Yugoslavia
M. Hudomalj ; Electrochemistry Laboratory, »Ruder Boskovic« Institute, 41000 Zagreb, Croatia, Yugoslavia
V. Pravdić ; Electrochemistry Laboratory, »Ruder Boskovic« Institute, 41000 Zagreb, Croatia, Yugoslavia


Puni tekst: engleski pdf 7.521 Kb

str. 149-156

preuzimanja: 96

citiraj


Sažetak

An attempt is described to determine the charge densities at
different layers of the surfaces of glass. Three different techniques
were used: the heat-of-immersion technique, the electron spin
resonance hyperfine splitting measurements, and the electrokinetic
streaming potential or current technique.
Estimates of the charge densities at the various interfaces
show the structure can be subdivided into the high and low
charge portions. The heat-of-immersion technique, looks into the
actual solid surface: there the charge density is estimated at in
excess of 1014 unit e-charges per cm2• The hyperfine splitting of
the 107Ag ESR spectrum assumed due to the electrostatic field at the
site of the localized atom position: a charge density of 0.7 to l.3Xl013
is estimated. It is assumed that the Ag atom is localized in the
gel-like layer- solution interface. The excess counter-ion charge
in the diffuse part of the double layer in the liquid phase is
estimated at 3 to 7 X 1012• Thus, the high charge density plane is
the interface solid-gel layer. The estimates are based on independent
models of the interface structure, widely accepted in
literature, although not entirely free of arbitrary assumptions.

Ključne riječi

Hrčak ID:

197295

URI

https://hrcak.srce.hr/197295

Posjeta: 212 *