Abstract
In this study, nanostructured mesoporous TiO2 was prepared by sol-gel process, and the synthesis was accomplished by using block copolymer as the structure-directing agent and TiCl4 as the inorganic precursor. TGA, XRD, SAXS, TEM and N2 adsorptiondesorption isotherms were used to characterize the microstructure, pore size, and pore structure after calcination. The powders were found to have a wormhole-like pore structure after calcination. When the addition of block copolymer increased from 0.1 to 1.5 g, the specific surface areas increased from 113.23 to 284.75 m2/g, but the average pore sizes decreased from 7.4 to 4.8 nm, and the average crystallite sizes decreased from 9.0 to 5.5 nm after being calcinated at 300 °C for 5 h. These results show that the mesostructure and crystallinity of TiO2 can be controlled by the additive concentrations of block copolymer.
Keywords: Nanostructured, block copolymer, mesoporous, crystallinity, TiO2
Current Nanoscience
Title: Effect of Block Copolymer Additives on the Structure and Crystallinity of Nanostructured Mesoporous TiO2
Volume: 5 Issue: 1
Author(s): Lay Gaik Teoh
Affiliation:
Keywords: Nanostructured, block copolymer, mesoporous, crystallinity, TiO2
Abstract: In this study, nanostructured mesoporous TiO2 was prepared by sol-gel process, and the synthesis was accomplished by using block copolymer as the structure-directing agent and TiCl4 as the inorganic precursor. TGA, XRD, SAXS, TEM and N2 adsorptiondesorption isotherms were used to characterize the microstructure, pore size, and pore structure after calcination. The powders were found to have a wormhole-like pore structure after calcination. When the addition of block copolymer increased from 0.1 to 1.5 g, the specific surface areas increased from 113.23 to 284.75 m2/g, but the average pore sizes decreased from 7.4 to 4.8 nm, and the average crystallite sizes decreased from 9.0 to 5.5 nm after being calcinated at 300 °C for 5 h. These results show that the mesostructure and crystallinity of TiO2 can be controlled by the additive concentrations of block copolymer.
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Cite this article as:
Teoh Gaik Lay, Effect of Block Copolymer Additives on the Structure and Crystallinity of Nanostructured Mesoporous TiO2, Current Nanoscience 2009; 5 (1) . https://dx.doi.org/10.2174/157341309787314610
DOI https://dx.doi.org/10.2174/157341309787314610 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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