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Titania Nano-network Film Templated from Microphase-separated Block Copolymer and its Photocatalysis in Fractured Form

Published online by Cambridge University Press:  01 June 2005

Shih-Yuan Lu*
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
Chia-Hao Chang
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
Chi-Hsien Yu
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
Hsin-Lung Chen
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
Yih Hsing Lo
Affiliation:
Department of Polymerization Catalysis and Engineering, Union Chemical Laboratories, ITRI, Hsin-Chu, Taiwan 300, Republic of China
*
a) Address all correspondence to this author. e-mail: sylu@mx.nthu.edu.tw
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Abstract

A thin-frame nano-network film of titania with backbone diameter of 20–30 nm was obtained from precursor templating of nano-porous polymer with nano-channels 50 nm in width. The nano-porous polymer templates were prepared by selective removal of the polyisoprene (PI) domain with ozone from the bicontinuous structure formed through blending a symmetric polystyrene-block-polyisoprene (PS-b-PI) copolymer with a PS homopolymer (h-PS). The titania network possessed the preferred anatase crystallinity for photocatalytic applications and a specific surface area of 53 m2/g, comparable to that of Degussa P25, a widely used commercial photocatalyst. Photocatalytic performance of the fractured titania network film was also comparable to that of Degussa P25 in both gas-phase NO oxidation and liquid phase methylene blue degradation. The much larger overall structure size of the fractured titania network film, however, offers advantages over the nano-particulate form of P25, namely, easy handling and rapid recycling from treated streams.

Type
Articles
Copyright
Copyright © Materials Research Society 2005

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References

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