Effect of the SiO2/GeO2 Ratio on the Properties of Porous Borosilicate Glass-Based Materials

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Abstract

Properties of porous materials prepared from glasses of the Na2O–B2O3–SiO2–GeO2 system have been studied using low-temperature nitrogen adsorption/desorption measurements. The results demonstrate that germanium substitution for silicon in the glasses studied leads to an increase in pore volume at SiO2/GeO2 ratios of down to 0.5. The porous glass with this composition has the largest specific surface area and micro- and mesopore volumes. We assume that the observed changes in the porosity parameters of glass in the case of complete germanium substitution for silicon are related to structural features of the borogermanate glass network, associated with B–O–B bond breaking and the formation of non-bridging oxygen atoms.

About the authors

O. N. Koroleva

Institute of Mineralogy, South Ural Federal Research Center of Mineralogy and Geoecology, Ural Branch, Russian Academy of Sciences, Ilmen State Reserve; South Ural State University

Email: n.korobatova@yandex.ru
456317, Miass, Chelyabinsk oblast, Russia; 454080, Chelyabinsk, Russia

N. M. Korobatova

Institute of Mineralogy, South Ural Federal Research Center of Mineralogy and Geoecology, Ural Branch, Russian Academy of Sciences, Ilmen State Reserve

Email: n.korobatova@yandex.ru
456317, Miass, Chelyabinsk oblast, Russia

R. S. Morozov

Nanotechnologies Science and Education Center, South Ural State University

Author for correspondence.
Email: n.korobatova@yandex.ru
454080, Chelyabinsk, Russia

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Copyright (c) 2023 О.Н. Королева, Н.М. Коробатова, Р.С. Морозов