Cortie, Michael B. and Xiao, Linda and Erdei, Laszlo and Kealley, Catherine S. and Dowd, Annette R. and Kimpton, Justin A. and McDonagh, Andrew M. (2011) Thermal stability of (KxNayH1-x-y)2Ti6013 nanofibers. European Journal of Inorganic Chemistry (33). pp. 5087-5095. ISSN 1434-1948
Abstract
Potassium-rich titanate nanofibers were produced by digesting TiO2 in concentrated KOH solutions under hydrothermal conditions. The nanofibers were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and thermogravimetric analysis. A hexa-titanate structure was assigned, in contrast to the tri-titanate structure usually resulting from NaOH treatment of TiO2. The potassium cations could be exchanged with others, such as sodium, hydrogen and ammonium. The potassium-rich hexa-titanate was found to be photocatalytic in the as-synthesized condition.
The thermal stability of the fibers during calcination was followed in situ using X-ray diffraction and was found to be strongly dependent on the chemical composition. The potassium-rich titanate converted to anatase at only 480 °C while the hydrogen-rich and ammonium-rich materials had to be heated to over 600 °C before conversion took place. Conversion was notably slowest in the ammonium-rich material. Surprisingly, the sodium-rich hexa-titanate did not form anatase at temperatures up to 800 °C, and instead recrystallized.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Permanent restricted access to published version due to publisher copyright policy. |
| Depositing User: | Dr Laszlo Erdei |
| Faculty / Department / School: | Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering |
| Date Deposited: | 17 Feb 2012 07:49 |
| Last Modified: | 11 Feb 2015 06:54 |
| Uncontrolled Keywords: | nanostructures; nanofibres; layered compounds; high-temperature chemistry; titanates; solid-state reactions |
| Fields of Research : | 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry 10 Technology > 1007 Nanotechnology > 100708 Nanomaterials 10 Technology > 1007 Nanotechnology > 100706 Nanofabrication, Growth and Self Assembly |
| Socio-Economic Objective: | B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861099 Ceramics, Glass and Industrial Mineral Products not elsewhere classified |
| Identification Number or DOI: | doi: 10.1002/ejic.201100651 |
| URI: | http://eprints.usq.edu.au/id/eprint/20632 |
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