In-flight coating of nanoparticles in atmospheric-pressure DBD torch plasmas

Issue		Eur. Phys. J. Appl. Phys. Volume 47, Number 2, August 2009 11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)


Article Number		22819
Number of page(s)		5
Section		11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)
DOI		10.1051/epjap/2009076
Published online		28 April 2009

Eur. Phys. J. Appl. Phys. 47, 22819 (2009)
DOI: 10.1051/epjap/2009076

In-flight coating of nanoparticles in atmospheric-pressure DBD torch plasmas

C. Nessim^{1, 2}, M. Boulos^{1, 2} and U. Kogelschatz³

¹ CREPE, Département de Génie Chimique, Université de Sherbrooke, Sherbrooke, J1K 2R1, Canada
² Tekna Plasma Systems Inc., Sherbrooke, Québec, J1L 2T9, Canada
³ Retired from ABB Corporate Research, 5405 Baden, Switzerland

christine.nessim@usherbrooke.ca

Received: 27 November 2008 / Accepted: 28 January 2009 / Published online: 28 April 2009

Abstract
Two DBD torch designs were used to investigate coating and surface functionalization of small particles. One had an annular discharge gap between coaxial quartz tubes, the second, suited for high throughput, used external shell electrodes on opposite sides of a quartz tube. Several discharge sections could be used in flow direction, with intermediate ports for particle and/or monomer injection. Both torches were operated by a sinusoidal high voltage (13 kV, 20 kHz). The coaxial torch always showed a filamentary discharge, while the shell-electrode design in He also produced diffuse glow discharges. A variety of different precursors and dielectric as well as metallic particles of nanometer or micrometer diameter were used.

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