Study on growth of hollow nanoparticles of alumina |
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Authors: | Naveen V Kulkarni Soumen Karmakar Srinanadan N Asthana Ashok B Nawale Arif Sheikh Shashikant P Patole J B Yoo Vikas L Mathe Ashok K Das Sudha V Bhoraskar |
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Affiliation: | (1) Department of Physics, University of Pune, Pune, 411007, India;(2) High Energy Materials Research Laboratory, Pune, 411021, India;(3) SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, 440-746, Korea;(4) Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai, 85, India; |
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Abstract: | This article addresses the growth of hollow nanocrystalline particles of γ-alumina by the post-oxidation of nano-aluminium
particles in air. The nanoparticles of aluminium were synthesized in a DC-transferred arc thermal plasma reactor. The as-synthesized
nano-aluminium particles were oxidized, in air, at different temperatures. The as-synthesized parent nano aluminium and their
daughter nanoparticles of aluminium oxide were thoroughly characterized with the help of X-ray diffraction analysis, high
resolution transmission electron microscopy and thermogravimetric analysis. Two-step oxidation behaviours, unique in nanoparticles,
are found to be the main driving force behind the formation of hollow spherical structures. The entire phenomenon is compared
with the oxidation behaviour of coarse grain aluminium. The content of γ-alumina, identified by X-ray diffraction, relative
to that of unreacted aluminium, has increased almost exponentially with the oxidation temperature in the case of nano aluminium.
Similar behaviour is not observed in the case of coarse grain aluminium. The crystalline features of alumina, forming the
walls of the hollow sphere, were confirmed by high resolution transmission electron microscopy. |
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