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Characterization of a DC-driven microplasma between a capillary tube and water surface

Lu, Y., Xu, S. F., Zhong, X. X., Ostrikov, K., Cvelbar, U. and Mariotti, D (2013) Characterization of a DC-driven microplasma between a capillary tube and water surface. EPL (Europhysics Letters), 102 (1). p. 15002. [Journal article]

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URL: http://stacks.iop.org/0295-5075/102/i=1/a=15002

Abstract

A microplasma generated between a stainless-steel capillary and water surface in ambient air with flowing argon as working gas appears as a bright spot at the tube orifice and expands to form a larger footprint on the water surface, and the dimensions of the bell-shaped microplasma are all below 1 mm. The electron density of the microplasma is estimated to be ranging from ##IMG## [http://ej.iop.org/images/0295-5075/102/1/15002/epl15344ieqn1.gif] <span class='mathrm'>5.32 × 10<sup>9</sup></span>} cm â��3 to ##IMG## [http://ej.iop.org/images/0295-5075/102/1/15002/epl15344ieqn2.gif] $2.02× 10<sup></sup>14$ cm â��3 for the different operating conditions, which is desirable for generating abundant amounts of reactive species. A computational technique is adopted to fit the experimental emission from the N 2 second positive system with simulation results. It is concluded that the vibrational temperature (more than 2000 K) is more than twice the gas temperature (more than 800 K), which indicates the non-equilibrium state of the microplasma. Both temperatures showed dependence on the discharge parameters ( i.e. , gas flow and discharge current). Such a plasma device could be arranged in arrays for applications utilizing plasma-induced liquid chemistry.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:25801
Deposited By: Professor Davide Mariotti
Deposited On:23 Apr 2013 11:36
Last Modified:17 Oct 2017 16:09

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