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Free-flowing, transparent γ-alumina nanoparticles synthesized by a supersonic thermal plasma expansion process

Nanoparticles of crystalline, phase-pure γ-alumina is synthesized in a supersonically expanded thermal plasma jet assisted experimental chemical reactor, with good control over the average particle sizes independently with respect to plasma current, oxygen flow rate and the ambient pressure in the s...

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Published in:Current applied physics 2012, 12(3), , pp.880-884
Main Authors: Bora, B., Aomoa, N., Bordoloi, R.K., Srivastava, D.N., Bhuyan, H., Das, A.K., Kakati, M.
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cited_by cdi_FETCH-LOGICAL-c453t-110ca0c95b35ed7f98a53630476bfd0638bf12460e680c47fc230195ba4b57983
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container_title Current applied physics
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description Nanoparticles of crystalline, phase-pure γ-alumina is synthesized in a supersonically expanded thermal plasma jet assisted experimental chemical reactor, with good control over the average particle sizes independently with respect to plasma current, oxygen flow rate and the ambient pressure in the sample collection chamber. Most of the synthesized particle samples were seen to be transparent, which gets more transparent with decrease in the particle sizes. The lowest achievable pressure in the chamber had produced particles with average 10 nm sizes, which was best also in terms of narrow size distribution. Another important observation was the absence of serious inter-particle agglomeration, producing free-flowing particles. Optical emission spectroscopic technique was used to study the plasma chemistry of the reaction zone as well as the plasma jet. ► Crystalline, transparent, phase-pure γ-alumina nanoparticles by a plasma method. ► Control over sizes through plasma current, oxygen flow rate and chamber pressure. ► 9 mbar chamber pressure produced 10 nm sizes, smallest by a plasma method. ► Also, free-flowing, crystalline, best transparent with a narrow size distribution. ► Emission spectroscopy used for plasma diagnostics and to study the plasma chemistry.
doi_str_mv 10.1016/j.cap.2011.12.001
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source Elsevier:Jisc Collections:Elsevier Read and Publish Agreement 2022-2024:Freedom Collection (Reading list)
subjects Agglomeration
Alumina
Chambers
Crystal structure
Nanoparticle-charging
Nanoparticles
Optical emission spectroscopy
oxygen
Particle size
Particle size distribution
physics
Plasma currents
Plasma synthesis
reaction chemistry
spectroscopy
Thermal plasmas
Transparent-ceramics
물리학
title Free-flowing, transparent γ-alumina nanoparticles synthesized by a supersonic thermal plasma expansion process
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