Drying process in the formation of sol-gel-derived TiO2 ceramic membrane

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Kumar, K.N.P. and Zaspalis, V.T. and Keizer, K. and Burggraaf, A.J. (1993) Drying process in the formation of sol-gel-derived TiO2 ceramic membrane. Journal of Non-Crystalline Solids, 147-14 . pp. 375-381. ISSN 0022-3093

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Abstract:Accurate drying data for thin titania gel layers dried at 40°C and 20% relative humidity (RH) are given. The drying rate versus free moisture content diagram should show three regions as predicted by the classical drying theory. They are the constant rate period, the first falling rate period and the second falling rate period. The second falling rate period was not observed in the present case, because at 40°C and 20% RH the equilibrium moisture content will be enough to provide a continuous fluid network in the gel. The total drying time in the falling rate period increases with layer thickness. The drying mechanism in the first falling rate period was identified as capillary flow.
Item Type:Article
Copyright:© 1992 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/12638
Official URL:http://dx.doi.org/10.1016/S0022-3093(05)80646-5
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