Formation and characterization of supported microporous ceramic membranes prepared by sol-gel modification techniques

Lange de, R.S.A. and Hekkink, J.H.A. and Keizer, K. and Burggraaf, A.J. (1995) Formation and characterization of supported microporous ceramic membranes prepared by sol-gel modification techniques. Journal of Membrane Science, 99 (1). pp. 57-75. ISSN 0376-7388

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Abstract:	The formation is described of supported microporous membranes (by IUPAC definition rpore < 1 nm), prepared by modification of mesoporous γ-alumina membranes with polymeric sols. The mesoporous γ-alumina membranes, with a top-layer thickness in the order of 7–10 μm, and with pore radii of 2–2.5 nm, have a very high surface finish (mean roughness 40 nm). The amorphous microporous top-layer thickness is in the order of 60–100 nm. Gas transport properties are effectively improved as is shown by activated permeation and molecular sieve-like separation factors in the order of 50–200 for H2/CH4. These microporous top-layers can be prepared from a relatively wide range of sol structures; from inorganic oligomers which are too small to result in significant scattering with SAXS, to polymeric structures with fractal dimensions in the range: 1 <df <2.04, and radii of gyration between 0.8 and 4 nm.
Item Type:	Article
Copyright:	© 1995 Elsevier Science
Research Group:	Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/12004
Official URL:	http://dx.doi.org/10.1016/0376-7388(94)00206-E
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Metis ID: 106446