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http://dx.doi.org/10.4191/kcers.2012.49.5.427

A Morphological Study on the Titanium-Oxide Foams Processed Using Freeze-Casting  

Yoon, Hyunjung (School of Advanced Materials Engineering, Kookmin University)
Choe, Heeman (School of Advanced Materials Engineering, Kookmin University)
Choi, Hyelim (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.5, 2012 , pp. 427-431 More about this Journal
Abstract
The $TiO_2$ foam synthesized using freeze-casting is a promising photocatalyst and photovoltaic electrode for a variety of energy applications, because the freeze-casting technique is easy to use, cheap, and suitable for mass-production. Despite its several advantages, little scientific information is available on the processing and morphology of the $TiO_2$ foams processed by freeze-casting. In particular, no systematic study has been performed on the microstructural evolution and morphological change of the rutile-phase $TiO_2$ foams during sintering. Therefore, in the present study, several $TiO_2$ foam samples were produced using the freeze-casting technique, which were then sintered at a relatively high temperature of $1200^{\circ}C$ for 1, 2, and 4 h to compare the morphological changes in the microstructure and to understand the effects of processing parameters of the rutile-phase $TiO_2$ foams. The foam ligament size increased near linearly with increasing sintering time whereas the average pore size decreased only slightly with increasing sintering time, with changes in particle morphology from sphere to rod and complete phase transformation from anatase to rutile.
Keywords
Porous ceramic; Freeze-casting; Ceramic foams; Titanium dioxide;
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Times Cited By KSCI : 3  (Citation Analysis)
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