Effects of duty ratio on liquid- and polymer-surface treatment by a unipolar microsecond-pulsed helium atmospheric-pressure plasma jet

Effects of duty ratio of a unipolar microsecond-pulsed helium atmospheric-pressure plasma jet (APPJ) on liquid- and polymer-surface treatments were investigated. In addition, changes in the plasma plume length, gas temperature, excitation temperature, discharge current, absorption power, and optical...

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Bibliographic Details
Published in:Physics of plasmas 2023-04, Vol.30 (4)
Main Authors: Bae, Jin Hee, Mun, Jong Jin, Seong, Min Jeong, Kim, Sun Ja, Joh, Hea Min, Chung, T. H.
Format: Article
Language:English
Subjects:
Emission spectra
Gas temperature
Helium
Parameters
Photoelectrons
Plasma
Plasma jets
Plasma physics
Polymers
Pressure effects
Spectrum analysis
Substrates
Surface energy
Surface treatment
Water vapor
Wettability
Wetting
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Summary:Effects of duty ratio of a unipolar microsecond-pulsed helium atmospheric-pressure plasma jet (APPJ) on liquid- and polymer-surface treatments were investigated. In addition, changes in the plasma plume length, gas temperature, excitation temperature, discharge current, absorption power, and optical emission spectra were examined by varying the other operating parameters, such as applied voltage and additive flow of oxygen or water vapor. As an example of liquid sample, de-ionized water (DW) was exposed to an APPJ, and the concentrations of the reactive species generated in the DW were measured as functions of the operating parameters. Polycarbonate, polypropylene, and polymethylmethacrylate were employed as exemplary substrate materials to investigate the effect of plasma treatment on polymeric surfaces. The APPJ treatment increased the surface energy and changed the wetting characteristics of the surface from hydrophobic to hydrophilic. X-ray photoelectron spectroscopy results showed that a short-time plasma treatment with He and/or He/O2, He/H2O affects the surface wettability owing to the introduction of polar groups.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0146736