ISSN:
1573-4846
Keywords:
silica membranes
;
pore size
;
aggregation
;
templates
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Polymeric silica sols were used to prepare membranes on commercial γ-Al2O3 supports with nominal support pore diameters of 4.0 nm. Aging of the silica sols was shown to be effective to form discrete membrane layers. He/N2 selectivity factors exceeding ideal Knudsen values were observed when the sols were prepared under conditions in which the condensation rate was minimized. We propose that the average pore size of the membrane depends on the balance of capillary pressure and modulus during membrane deposition. The condensation rate might influence the breadth of the pore size distribution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00486293
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