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

Y. Lu, S. F. Xu, X. X. Zhong, K. Ostrikov, U. Cvelbar, D Mariotti

Research output: Contribution to journalArticle

18 Citations (Scopus)

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] 5.32 × 109} cm â��3 to ##IMG## [http://ej.iop.org/images/0295-5075/102/1/15002/epl15344ieqn2.gif] $2.02× 1014$ 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.
LanguageEnglish
Pages15002
JournalEPL
Volume102
Issue number1
Publication statusPublished - 2013

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microplasmas
capillary tubes
surface water
direct current
orifices
gas discharges
footprints
gas temperature
bells
gas flow
stainless steels
argon
chemistry
tubes
temperature dependence
air
liquids
gases
simulation
temperature

Cite this

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. EPL , 102(1), 15002.
Lu, Y. ; Xu, S. F. ; Zhong, X. X. ; Ostrikov, K. ; Cvelbar, U. ; Mariotti, D. / Characterization of a DC-driven microplasma between a capillary tube and water surface. In: EPL . 2013 ; Vol. 102, No. 1. pp. 15002.
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Lu, Y, Xu, SF, Zhong, XX, Ostrikov, K, Cvelbar, U & Mariotti, D 2013, 'Characterization of a DC-driven microplasma between a capillary tube and water surface', EPL , vol. 102, no. 1, pp. 15002.

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.

In: EPL , Vol. 102, No. 1, 2013, p. 15002.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterization of a DC-driven microplasma between a capillary tube and water surface

AU - Lu, Y.

AU - Xu, S. F.

AU - Zhong, X. X.

AU - Ostrikov, K.

AU - Cvelbar, U.

AU - Mariotti, D

PY - 2013

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N2 - 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] 5.32 × 109} cm â��3 to ##IMG## [http://ej.iop.org/images/0295-5075/102/1/15002/epl15344ieqn2.gif] $2.02× 1014$ 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.

AB - 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] 5.32 × 109} cm â��3 to ##IMG## [http://ej.iop.org/images/0295-5075/102/1/15002/epl15344ieqn2.gif] $2.02× 1014$ 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.

M3 - Article

VL - 102

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JO - EPL

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JF - EPL

SN - 0295-5075

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Lu Y, Xu SF, Zhong XX, Ostrikov K, Cvelbar U, Mariotti D. Characterization of a DC-driven microplasma between a capillary tube and water surface. EPL . 2013;102(1):15002.