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., & Mariotti, D. (2013) Characterization of a DC-driven microplasma between a capillary tube and water surface. Europhysics Letters, 102(1), 15002-p1.

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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 5.32 × 109 cm−3 to 2.02 × 1014 cm−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 N2 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 plasmainduced liquid chemistry.

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9 citations in Web of Science®

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ID Code: 74683
Item Type: Journal Article
Refereed: Yes
DOI: 10.1209/0295-5075/102/15002
ISSN: 1286-4854
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 EPLA
Deposited On: 04 Aug 2014 03:51
Last Modified: 08 Oct 2015 05:43

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