Synthesis of core-shell AlOOH hollow nanospheres by reacting Al nanoparticles with water

A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled AlOOH nanosheets by oxidizing Al nanopowder in pure water under mild processing conditions is described. The stepwise events of Al transformation into boehmite are followed by monitor...

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Bibliographic Details
Published in:Nanotechnology 2016-05, Vol.27 (20), p.205603-205609
Main Authors: Lozhkomoev, A S, Glazkova, E A, Bakina, O V, Lerner, M I, Gotman, I, Gutmanas, E Y, Kazantsev, S O, Psakhie, S G
Format: Article
Language:English
Subjects:
Aluminum
Aluminum - chemistry
Aluminum Hydroxide - chemistry
aluminum nanoparticles
Aluminum Oxide - chemistry
Boehmite
Byproducts
core-shell nanostructures
Dissolution
hollow nanospheres
Nanoparticles
nanosheets
Nanospheres
Nanospheres - chemistry
Nanospheres - ultrastructure
Nanostructure
Nanotechnology - methods
oxidation
Synthesis
Water - chemistry
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Summary:A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled AlOOH nanosheets by oxidizing Al nanopowder in pure water under mild processing conditions is described. The stepwise events of Al transformation into boehmite are followed by monitoring the pH in the reaction medium. A mechanism of formation of hollow AlOOH nanospheres with a well-defined shape and crystallinity is proposed which includes the hydration of the Al oxide passivation layer, local corrosion of metallic Al accompanied by hydrogen evolution, the rupture of the protective layer, the dissolution of Al from the particle interior and the deposition of AlOOH nanosheets on the outer surface. In contrast to previously reported methods of boehmite nanoparticle synthesis, the proposed method is simple, and environmentally friendly and allows the generation of hydrogen gas as a by-product. Due to their high surface area and high, slit-shaped nanoporosity, the synthesized AlOOH nanostructures hold promise for the development of more effective catalysts, adsorbents, vaccines and drug carriers.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/27/20/205603