Study of temperature stability of titanate nanotubes up to 800 °C

Tereza Brunatova¹, Alexandra Rudajevova¹, Michal Vaclavu², Stanislav Danis¹,Daniela Popelkova³, Radomir Kuzel¹

¹Charles University, Faculty of Mathematics and Physics, Dept.of Condensed Matter Physics, Prague

²Charles University, Faculty of Mathematics and Physics, Dept.of Surface and Plasma Science, Prague

 ³Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague

 

Study of temperature stability of titanate nanotubes (Ti-NT) is important because some of possible applications of Ti-NT require heating [1]. By heating of Ti-NT at low temperature range (from room temperature till approximately 200°C) the releasing of the adsorbed and interlayer water were observed [2],[3],[4], [5]. These releasing of water were observed by X-ray diffraction [2], [4] and DSC analysis [3], [5]. At higher temperature the anatase structure of TiO₂ started grow [4],[5]. Finely at the temperature higher than 700°C the nanotubes transform to nanorods with structure: Na₂Ti₆O₁₃ [2],[3],[4],[5] and nanoparticles with rutile structure of TiO₂ [4],[5].

In this contribution, the structure changes of titanate nanotubes will be studied by combination of powder X-ray diffraction, differential scanning calorimetry, thermal gravimetric analysis and mass spectroscopy. The study was done in two atmosphere - air and inert atmosphere (vacuum, helium). In air and inert atmosphere, the releasing of water was observed by X-ray diffraction, DSC and confirm with mass spectroscopy at low temperature. The transformation to anatase structure of TiO₂ was observed by powder X-ray diffraction and DSC in air and inert atmosphere. However other transformation at high temperature to Na₂Ti₆O₁₃ and rutile structure of TiO₂ was observed only in air atmosphere. In vacuum atmosphere the anatase was only stable phase. In He the black rutile was found on DSC curve.

 

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[4] Yoshida R., Suzuki Y., and Yoshikawa S.:. Efects of synthestic con-ditions and heat-treatment on the structure of partially ion-exchange titanate nanotube. Materials chemistry and physics, 91, 2005.

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