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Molar volume of SiOH estimated from swelling strains
Author(s) -
Fett Theo,
Schell Karl G.,
Wiederhorn Sheldon M.
Publication year - 2020
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.13564
Subject(s) - swelling , volume (thermodynamics) , molar volume , diffusion , molar , materials science , mole , hydrogen , chemistry , polymer chemistry , analytical chemistry (journal) , composite material , organic chemistry , thermodynamics , medicine , physics , dentistry
As water diffuses into silica glass, it reacts with the silica network to generate hydroxyl groups that cause a volume swelling of the glass. We discuss this effect quantitatively for cases in which hydroxyl groups were produced either by gamma‐irradiation of hydrogen‐saturated silica glass or by high‐temperature diffusion of water into silica glass. From volume swelling measurements, the partial molar volume of hydroxyl groups for both treatments is determined to be 7.5 cm 3 /mol. Since two moles of SiOH are generated for each mole of water reacting with the glass, the reaction volume, Δ V ¯ , is 15.0 cm 3 /mol.