A model for ceramic membrane formation by dip-coating |
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| Affiliation: | 1. Material Science Innovation and Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho, 2735, South Africa;2. Department of Chemistry, School of Physical and Chemical Sciences, Faculty of Natural and Agricultural Sciences, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho, 2735, South Africa;3. Department of Science and Technology Education, University of Johannesburg, Johannesburg, South Africa;4. Department of Biology, Chemistry and Physics, School of Natural and Applied Sciences, Namibia University of Science and Technology, Private Bag 13388 Windhoek, Namibia |
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| Abstract: | The wet ceramic membrane formation on a porous substrate in the dip-coating process plays a key role for high quality separation layers of the asymmetric membranes. A model to quantitatively describe the membrane growth under a driving force of the capillary filtration is derived on the basis of the slip-casting model. As an example, α-Al2O3 microfiltration membranes were prepared by dip-coating. The influence of the dipping time on the membrane thickness was examined. The data for α-Al2O3 microfiltration membranes fit the predictions made by the model well. In addition, the results of γ-Al2O3 membranes demonstrate that this model is also valid for ultrafiltration membrane formation by dipping sols. |
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