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Fabrication and Microstructure Characterization of Continuous Porous TiO 2 /Al 2 O 3 Composite Membrane
Author(s) -
Lee ByongTaek,
Paul Rajat Kanti,
Hong HyunJin,
Lee KapHo
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.02977.x
Subject(s) - materials science , anatase , calcination , porosity , crystallite , rutile , composite number , microstructure , chemical engineering , composite material , extrusion , membrane , fabrication , mineralogy , photocatalysis , metallurgy , chemistry , catalysis , medicine , biochemistry , alternative medicine , pathology , engineering
Using a multipass extrusion process, continuous porous Al 2 O 3 body (∼41% porosity) was produced and used as a substrate to fabricate continuous porous TiO 2 /Al 2 O 3 composite membrane. The diameter of the continuous pores of the porous Al 2 O 3 body was about 150 μm. The TiO 2 nanopowders dip coated on the continuous pore‐surface Al 2 O 3 body existed as rutile and anatase phases after calcination at 520°C in air. However, after aging of the fabricated continuous porous TiO 2 /Al 2 O 3 composite membrane in 20% NaOH at 60°C for 24 h, a large number of TiO 2 fibers frequently observed on the pore surface. The diameter of the TiO 2 fibers was about 150 nm having a high specific surface area. However, after 48‐h aging period, the diameter of the TiO 2 fibers increased, which was about 3 μm. Most of the TiO 2 fibers had polycrystalline structure having nanosized rutile and anatase crystals of about 20 nm.