Sol-gel synthesis and characterization of microporous silica membranes. 1: SAXS study on the growth of polymeric structures
- Univ. of Twente, Enschede (Netherlands)
Microporous silica membranes are attractive materials for gas separation and membrane reactors. Silica-based microporous membranes can be successfully processed by sol-gel techniques. However, tailor making of such membranes is still not possible because of the unavailability of systematic studies on membrane oriented sol processing and characterization. The present series of papers aims to give a systematic understanding of silica polymeric growth, synthesis chemistry, and finally membrane characterization. Polymeric silica sols were prepared by hydrolysis and condensation of alkoxide. The fractal growth of the polymers during sol-gel transition is monitored with the help of small angle X-ray scattering. Fractal dimensions and radii of gyration of sols and gels with different synthesis chemistry are compared. The type of aggregation mechanism prevailing in these systems is identified as cluster-cluster aggregation with reaction limitations during synthesis and reaction and diffusion limitations during aging.
- OSTI ID:
- 238019
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 178; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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