Phase transformations and crystallization kinetics in electrospun TiO2 nanofibers in air and argon atmospheres
MetadataShow full item record
The final publication is available at Springer via http://doi.org/10.1007/s00339-014-8246-1
The effects of atmospheric air and argon environments on thermal-induced phase transformations in electrospun TiO2 nanofibers have been investigated in situ using synchrotron radiation diffraction. Diffraction results showed that the as-synthesized TiO2 nanofibers were initially amorphous, but crystallized to form anatase and rutile after thermal annealing in air or argon at elevated temperatures. The crystallization temperature of anatase was delayed by 100 °C in argon relative to in air, and the transformation of anatase into rutile occurs faster in argon atmosphere than in air due to the formation of oxygen vacancies. Non-linear strains formed in both polymorphs and the substantial elevation of rutile thermal expansion pointed to strain anisotropy in the rutile phase and the concomitant fibre breakage.
Showing items related by title, author, creator and subject.
Activation energies for phase transformations in electrospun titania nanofibers: comparing the influence of argon and air atmospheresAlbetran, H.; O Connor, B.; Low, It Meng (2016)This paper reports on titania absolute phase level (amorphous, anatase, and rutile forms) changes in electrospun amorphous titania nanofibers from 25 to 900 °C in air and argon atmospheres. A novel method was developed ...
Albetran, Hani Manssor Mohammed; Haroosh, Hazim Jasim Mohammed; Dong, Yu; O'Connor, B.; Low, It Meng (2014)Titanium dioxide has received much attention as an important photocatalytic material. In this paper, the effects of air and argon atmosphere on the crystallisation kinetics and phase relations in electrospun TiO2 nanofibres ...
Albetran, Hani; Alsafwan, Asmahan; Haroosh, Hazim; Dong, Yu; Low, It Meng (2014)Nanostructured TiO2 has received much attention recently owing to their promising physical properties for photocatalytic applications. The process of photocatalysis is closely related to the electronic band gap which is ...