Abstract
Abstract : The slow dehydration and dehydroxylation of porous Vycor glass was followed by infrared spectroscopic techniques from 500C to 825C. Four bands at 3850, 3755, 3710, and 3650/cm were observed. Dehydroxylation, deuteration, and fluoridation experiments showed all bands to be due to surface hydroxyl species. The 3755/cm band is due to free surface hydroxyls. The 3650/cm band is due to OH vibrations perturbed by hydrogen bonding. The 3710/cm band has not been detected before, has a half-width of 5 to 14/cm, and can only be observed at relatively low surface coverage. Impregnation of silica and porous glass with boric acid produced a band at 3710/cm with the silica and enhanced that found with the glass, leading to the assignment of the 3710/cm band to a B-OH surface structure. The 3850/cm band is tentatively assigned to a combination of silanol and B-OH frequencies. (Author)
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