Fabrication and Microstructure Characterization of Continuous Porous TiO2/Al2O3 Composite Membrane |
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| Authors: | Byong-Taek Lee Rajat Kanti Paul Hyun-Jin Hong Kap-Ho Lee |
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| Affiliation: | Department of Biomedical Engineering and Materials, Soonchunhyang University, Chungnam 330-090, South Korea;
School of Advanced Materials Engineering, Chungnam National University, Daejon 305-764, South Korea |
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| Abstract: | Using a multipass extrusion process, continuous porous Al2O3 body (～41% porosity) was produced and used as a substrate to fabricate continuous porous TiO2/Al2O3 composite membrane. The diameter of the continuous pores of the porous Al2O3 body was about 150 μm. The TiO2 nanopowders dip coated on the continuous pore-surface Al2O3 body existed as rutile and anatase phases after calcination at 520°C in air. However, after aging of the fabricated continuous porous TiO2/Al2O3 composite membrane in 20% NaOH at 60°C for 24 h, a large number of TiO2 fibers frequently observed on the pore surface. The diameter of the TiO2 fibers was about 150 nm having a high specific surface area. However, after 48-h aging period, the diameter of the TiO2 fibers increased, which was about 3 μm. Most of the TiO2 fibers had polycrystalline structure having nanosized rutile and anatase crystals of about 20 nm. |
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