Formation of Micro- and Mesoporous Substructures in the
Course
of the Leaching Process of Two-Phase Alkali Borosilicate Glass

V. A. Kreisberg^a, T. V. Antropova^b, and S. V. Kalinina^b

^aFaculty of Chemistry, Moscow State University, Moscow, 119992 Russia

e-mail: kreis@kge.msu.ru

^bGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
nab. Makarova 2, St. Petersburg, 199034 Russia

Received July 10, 2013

Abstract—The influence of the acid leaching conditions (duration, HCl concentration) of phase-separated
alkali borosilicate glass with composition 7.6Na₂O 20.4B₂O₃ 71.9SiO₂ 0.1Al₂O₃ on the porous glass (PG)
structure formation has been studied with diagnostics of meso- and micropores. The morphology of the PG
pores has been investigated with the use of the equilibrium and kinetic adsorption-desorption methods at low,
medium, and high relative pressures. It has been established that all PG samples under study were characterized
by a polymodal pore size distribution with micropore sizes ranging from 0.45 to 0.70 nm (up to 3 modes) and
mesopores (from 2 to 4 modes, with a dominant bimodal distribution). At the end of the acid leaching process
and with an increasing duration of treatment and acid concentration, the secondary silica structuring in the liq-
uation channels takes place. In addition, the fraction of liquation channels free of secondary silica particles
decreased, the width of the second peak attributed to mesopores increased, with a modification of their shape
and packing. The fraction of micropores in the total volume of accessible pores decreased from 7.5 by up to
5.5%.

Keywords: two-phase alkali-borosilicate glass, acid leaching, micro- and mesopore formation

DOI: 10.1134/S1087659614030110

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