Polymerdimethylsiloxane surface treatment with an atmospheric pressure helium plasma jet driven by unipolar nanosecond pulses

Tang, Tianyu; Lee, Hyungjun; Kim, H.S.; Kim, G.H.; Lee, B.; Kim, H.J.

doi:10.1016/j.cap.2021.05.008

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…At lower applied voltages velocity decreases, roughly scaling with the voltage peak value [25]. Experimentally FIW propagation in the nsdischarges has been studied in the numerous works [15,[26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…The repetitively pulsed ns-discharges have high application potential in several important domains, such as combustion ignition [6,7,32], surface treatment [15], flow control [9], molecular pollutant degradation [10] as well as in gas reforming, including CO 2 conversion [13,14], nitrogen fixation [12] and NO x compounds reduction [11], as briefly summarized in table 1. Mainly CO, NO x and O radicals were in focus so far [12][13][14]33], including a comparative study of O and NO density by laser-based methods [12] and CO quantification by gas chromatography [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on application ns-discharges can operate in various geometries, starting from low-pressure gaseous diodes [26,27,34], and ending up by the dielectric barrier discharge (DBD) [10], capacitive [33], pin-to-pin [13,14,35], coaxial [11,36], water-contacting [12] and finally jet geometry with both internal [37][38][39] and surrounding the tube [15,[40][41][42][43] electrode configurations. The variety of jet geometries are discussed by Lu et al [44] and by Morabit et al [45].…”

Section: Introductionmentioning

confidence: 99%

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Diagnostics of a nanosecond atmospheric plasma jet. Electron and ro-vibrational excitation dynamics

Britun¹,

Christy²,

Gamaleev³

et al. 2022

Plasma Sources Sci. Technol.

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Atmospheric repetitive He discharge with 10 ns current peak width and 3 × 10 11 V s−1 voltage front rise working in jet geometry is studied. The first part of the study is devoted to electrical and optical discharge characterization including voltage-current behavior, emission dynamics, as well as ro-vibrational dynamics of N2, N 2 + and OH molecules. It is found that He atoms get excited at the very early stage, as a result of ionization wave formation. This process follows by excitation of O, N2 and N 2 + . It is also shown that a rather small (0.1%–1%) air admixtures facilitate gas breakdown, as revealed by shortening of the discharge current risetime. The rotational excitation of N 2 + always overtakes He excitation by about 5 ns, with rotational temperature peaking at about 650 K and decaying afterwards, whereas rotational temperature of N2 always remains constant equal to about 300 K. This value is associated with gas kinetic temperature since the electron-rotational (e-R) excitation process is too slow, so it cannot be activated during the plasma phase and no additional change in rotational excitation of N2 happens. Nitrogen molecules remain vibrationally excited in the discharge, post-discharge and jet areas after the plasma pulse which is likely a result of ionization wave propagation. Upon water vapor injection the apparent OH rotational distributions reveal double Boltzmann slope representing thermalized and non-thermalized OH groups. Rotational temperature of the thermalized group correlates with the one of N 2 + showing, however, much longer relaxation time, whereas for the non-thermalized group it remains above 1 eV at all conditions. The obtained results confirm that the studied ns- discharge is a good candidate for temperature-sensitive applications, such as the bio-sample treatment. Further analysis related to the ionization waves, electron density and electric field behavior is undertaken in the second part.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diagnostics of a nanosecond atmospheric plasma jet. Electron and ro-vibrational excitation dynamics

Britun¹,

Christy²,

Gamaleev³

et al. 2022

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In addition, because APPs are not in equilibrium, they retain ambient gas temperature. Thus, APPs are often used for surface treatment, processing of polymers, and biomedical applications [2][3][4][5][6][7][8][9]. The chemical interactions in APPs are being actively studied for the surface treatment of polymers [5].…”

Section: Introductionmentioning

confidence: 99%

Optical Diagnostics for Dual Jet Interactions of Helium Atmospheric Pressure Plasmas

Kim

et al. 2022

Appl. Sci. Converg. Technol.

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In this study, the interactions of dual plasma jets have been optically diagnosed for various alignment angles, gas flow rates, and applied voltage conditions to investigate the interactions of plasma plumes emitted from each jet. An anti-parallel alignment of the dual jets with in-phase voltage waveforms had a repulsive interaction. In contrast, the perpendicular alignment results in an attractive interaction when the applied voltage and gas flow rate are sufficiently large. We found that the mechanisms of the attractive and repulsive interactions are strongly related to the electrostatic potential distributions between the dual jets.

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Diagnostics of a nanosecond atmospheric plasma jet. Ionization waves, plasma density and electric field dynamics

Britun

Christy

Gamaleev

et al. 2023

Journal of Applied Physics

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Atmospheric repetitive He discharge with 10 ns current peak width and 3×1011 V/s voltage front rise working in jet geometry is studied. This part deals with the ionization waves, electron density, and electric field dynamics. The electron density (ne) is measured by Stark broadening of the H Balmer β (Hβ) and He emission lines, the electric field is analyzed using Stark polarization spectroscopy, and the ionization waves are studied by fast imaging. We found that the ionization fronts propagate in the quartz tube with a velocity of about 5×105 m/s; this velocity slowly decreases along the tube but may jump in the open air at some conditions. In the space between electrodes, ne increases rapidly at the beginning, reaching about 7×1015 cm−3, which corresponds to electron avalanche defining the discharge current peak. In the tube, the electrons are concentrated in the ionization wavefronts having low density (<1014 cm−3). Before the avalanche, a macroscopic (electrode-induced) electric field dominates between the electrodes peaking at about 8 kV/cm as deduced from Hβ peak splitting, whereas during the avalanche, Hβ reveals a double-Lorentzian polarization-insensitive profile imposed by two electron populations. In the low-density electron group, ne does not exceed 1014 cm−3, whereas the high-density group is responsible for the observed electron density peak formation. After a rapid decay of the electrode-induced field, the microscopic electric field (induced by space-charge) dominates, peaking at about 25 kV/cm after the electron density peak. Certain electric field anisotropy is also detected in the quartz tube, confirming the wavefront propagation.

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Polymerdimethylsiloxane surface treatment with an atmospheric pressure helium plasma jet driven by unipolar nanosecond pulses

Cited by 6 publications

References 36 publications

Diagnostics of a nanosecond atmospheric plasma jet. Electron and ro-vibrational excitation dynamics

Diagnostics of a nanosecond atmospheric plasma jet. Electron and ro-vibrational excitation dynamics

Optical Diagnostics for Dual Jet Interactions of Helium Atmospheric Pressure Plasmas

Diagnostics of a nanosecond atmospheric plasma jet. Ionization waves, plasma density and electric field dynamics

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