Structural evolution of colloidal silica gels to glass

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb03982.x· OSTI ID:5841244

Ying, J Y; Benziger, J B ^[1]; Navrotsky, A ^[2]

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1. Princeton Univ., NJ (United States). Dept. of Chemical Engineering
2. Princeton Univ., NJ (United States). Dept. of Geological and Geophysical Sciences

The gel-to-ceramic evolution of colloidal-derived silica gels was examined by thermal analysis, infrared photoacoustic spectroscopy, physical characteristic, and high-temperature calorimetry. Oxygen in the firing atmosphere promoted sintering of colloidal gels relative to firing in a nitrogen or argon atmosphere. Water vapor in the atmosphere promoted consolidation and crystallization to cristobalite. Addition of PVA to the colloidal gel resulted in consolidation and crystallization of the gel at 1000 C, [approximately]150 C less than gels without the PVA binder. The enthalpy of consolidation of the gels to fused silica glass was approximately [minus]10kJ/mol, primarily due to reduction of surface area.

• DOE Contract Number: FG02-85ER13437
• OSTI ID: 5841244
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:10; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GLASS
FABRICATION
SILICA GEL
PHASE TRANSFORMATIONS
SINTERING
CALORIMETRY
MICROSTRUCTURE
PHOTOACOUSTIC SPECTROSCOPY
THERMAL ANALYSIS
ADSORBENTS
SPECTROSCOPY
360601* - Other Materials- Preparation & Manufacture
360602 - Other Materials- Structure & Phase Studies