Control over the hierarchical structure of titanate nanotube agglomerates


Bavykin, Dmitry V., Kulak, Alexander N. and Walsh, F.C. (2011) Control over the hierarchical structure of titanate nanotube agglomerates. Langmuir, 27, (9), 5644-5649. (doi:10.1021/la200527p).

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Description/Abstract

An alkaline hydrothermal treatment of several types of ordered macroporous TiO2 structures, namely microtubes, sea urchin shapes and anodic nanotubes array has been investigated under stationary conditions. The effect of the size and geometry of these structures on the morphology of forming hierarchical agglomerates of titanate nanotubes have been systematically studied. It has been revealed that at sizes larger than the critical value (ca. 1 μm), the whole geometry of the initial ordered TiO2 structure is maintained under reaction conditions leading to formation of hierarchical structures, in which bulk TiO2 is replaced with titanate nanotube agglomerates. This principle provides a convenient route for the preparation of multi-scale micro- and nanostructures of TiO2 based materials. The analysis of critical size suggests that under reaction conditions, due to the limited transport of dissolved Ti(IV) species, the growth of nanotubes occurs locally.

Item Type: Article
ISSNs: 0743-7463 (print)
1520-5827 (electronic)
Keywords: solvothermal synthesis, reflux, surface area, stability, mechanism
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TP Chemical technology
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 183745
Date Deposited: 04 May 2011 10:21
Last Modified: 27 Mar 2014 19:39
Research Funder: EPSRC
Projects:
The hydrothermal route to metal oxide nanotubes: synthesis and energy conversion application. A First Grant Proposal
Funded by: EPSRC (EP/F044445/1)
Led by: Dmitry V. Bavykin
15 September 2008 to 14 September 2010
URI: http://eprints.soton.ac.uk/id/eprint/183745

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