Control over the hierarchical structure of titanate nanotube agglomerates
Control over the hierarchical structure of titanate nanotube agglomerates
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 ?m), 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.
solvothermal synthesis, reflux, surface area, stability, mechanism
5644-5649
Bavykin, Dmitry V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Kulak, Alexander N.
7dc57b4f-aae0-42a4-ae15-fd50ab6521c2
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
March 2011
Bavykin, Dmitry V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Kulak, Alexander N.
7dc57b4f-aae0-42a4-ae15-fd50ab6521c2
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Bavykin, Dmitry V., Kulak, Alexander N. and Walsh, F.C.
(2011)
Control over the hierarchical structure of titanate nanotube agglomerates.
Langmuir, 27 (9), .
(doi:10.1021/la200527p).
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 ?m), 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.
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Published date: March 2011
Keywords:
solvothermal synthesis, reflux, surface area, stability, mechanism
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 183745
URI: http://eprints.soton.ac.uk/id/eprint/183745
ISSN: 0743-7463
PURE UUID: d04008d1-11a9-49a7-b0d4-55908cea457f
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Date deposited: 04 May 2011 10:21
Last modified: 14 Mar 2024 03:04
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Author:
Alexander N. Kulak
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