The effect of different atmospheres on structural changes of titanate nanotubes during heating

0473864 - ÚMCH 2018 RIV HU eng J - Journal Article
Václavů, T. - Rudajevová, A. - Václavů, M. - Daniš, S. - Popelková, Daniela - Kužel, R.
The effect of different atmospheres on structural changes of titanate nanotubes during heating.
Journal of Thermal Analysis and Calorimetry. Roč. 128, č. 2 (2017), s. 779-785. ISSN 1388-6150. E-ISSN 1588-2926
Institutional support: RVO:61389013
Keywords : titanate nanotubes * X-ray diffraction * thermal analysis
OECD category: Polymer science
Impact factor: 2.209, year: 2017

Thermal stability of titanate nanotubes (Ti-NT) was studied in temperature range from room temperature up to 1000 °C in three different atmospheres—in air, vacuum and helium—and differences were observed. In air, vacuum and helium, the release of adsorbed and crystal water was detected in temperatures up to 200 °C. Transformation of the initial structure to anatase form of TiO2 was found independently of the atmosphere used. But in air the transformation to anatase occurred at lower temperature. The difference between these atmospheres was approximately 100 °C. However, only in air, the transformation to sodium hexatitanate and rutile form of TiO2 occurred at higher temperatures. In vacuum, only the anatase phase was detected up to 800 °C. In helium, the transformation to rutile was observed but not to sodium hexatitanate. The changes of the initial structure of Ti-NT during the elevation of temperature were studied by combination of in situ powder X-ray diffraction, differential scanning calorimetry, thermal gravimetric analysis and mass spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0271219