INFRARED STUDY OF THE NATURE OF THE HYDROXYL GROUPS ON THE SURFACE OF POROUS VYCOR GLASS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0624595
Entities
People
- Manfred J. D. Low
- N. Ramasubramanian
Organizations
- Rutgers University Department of Chemistry and Chemical Biology