Structural and Electrosurface Properties of Iron-Containing Porous Glasses in NaCl Solutions. II. Surface Charge and Electrokinetic Potential of Porous Glasses
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Equilibrium electrosurface characteristics (surface charge and electrokinetic potential) have been determined for porous glasses with different compositions (magnetite-containing and magnetite-free glasses) in solutions of an indifferent electrolyte (NaCl). It has been revealed that the incorporation of iron oxide into the glass matrix increases the absolute value of the surface charge of the composite material relative to high-silica porous glass obtained from basic sodium borosilicate glass. The electrokinetic potentials determined from a set of experimental data on the streaming potential, electrophoretic mobility of porous glass particles, their specific electrical conductivity, and the structure of the pore space have been analyzed. It has been found that freshly prepared iron-containing glass samples and those exposed in electrolyte solutions for a long time have different electrokinetic characteristics.
This work was supported by the Russian Foundation for Basic Research, project no. 17-03-01011a.
The samples of two-phase glasses were prepared at the Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, within the framework of a state order, project no. АААА-А16-116020210284-7. The study was performed using the equipment of the Research Park of St. Petersburg State University (the Interdisciplinary Resource Center for Nanotechnology, Centre for X-ray Diffraction Studies of Investigation and the Cryogenics Department).
We are grateful to I.N. Anfimova for help in the preparation of two-phase and porous glass samples.
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