Measurement of optical signals as a plasma propagation in the atmospheric pressure plasma jet columns

Kim, Yunjung; Han, Gook-Hee; Jin, Sewhan; Choi, Eun Ha; Uhm, Han S.; Cho, Guangsup

doi:10.1016/j.cap.2014.10.013

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…For a turbulent flow beyond Rn > 4000, the length of the plasma column was short in front of the electrode, which eventually led to a shutdown. The propagation of plasma diffusion waves in a plasma column generated inside a glass tube was further studied [ 104 ] and optically measured [ 105 ].…”

Section: Plasma Sourcesmentioning

confidence: 99%

Plasma bioscience and its application to medicine

Choi

Uhm²,

Kaushik

2021

AAPPS Bull.

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Nonthermal atmospheric pressure biocompatible plasma (NBP), alternatively called bio-cold plasma, is a partially ionized gas that consists of charged particles, neutral atoms and molecules, photons, an electric field, and heat. Recently, nonthermal plasma-based technology has been applied to bioscience, medicine, agriculture, food processing, and safety. Various plasma device configurations and electrode layouts has fast-tracked plasma applications in the treatment of biological and material surfaces. The NBP action mechanism may be related to the synergy of plasma constituents, such as ultraviolet radiation or a reactive species. Recently, plasma has been used in the inactivation of viruses and resistant microbes, such as fungal cells, bacteria, spores, and biofilms made by microbes. It has also been used to heal wounds, coagulate blood, degrade pollutants, functionalize material surfaces, kill cancers, and for dental applications. This review provides an outline of NBP devices and their applications in bioscience and medicine. We also discuss the role of plasma-activated liquids in biological applications, such as cancer treatments and agriculture. The individual adaptation of plasma to meet specific medical requirements necessitates real-time monitoring of both the plasma performance and the target that is treated and will provide a new paradigm of plasma-based therapeutic clinical systems.

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Section: Plasma Sourcesmentioning

confidence: 99%

Plasma bioscience and its application to medicine

Choi

Uhm²,

Kaushik

2021

AAPPS Bull.

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“…4. Bullet pattern of a plasma jet is observed by means of an intensified charge coupled device (ICCD) with a gate width of = 50 ns where used plasma jets are specified [6], [13].…”

Section: Resultsmentioning

confidence: 99%

“…VELOCITIES IN OUR EXPERIMENT ARE SHOWN THROUGH OPTICAL SIGNALS PRODUCED BY PLASMA JETS THAT WERE USED ARE SPECIFIED IN[13] …”

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confidence: 99%

Patterns of Plasma Bullet in Plasma Jets

Han

Koo

Choi

et al. 2015

IEEE Trans. Plasma Sci.

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Composite charges applied to plasma striations were investigated through this paper. Bullets in plasma jets stemming from effective electrons made up of a moving target electron with screening electrons and ions around it were assessed using an atom-like structure induced by an external electric or magnetic field. To maintain a zero total charge, screening electrons and ions were assumed to be spherically and symmetrically distributed around a target moving electron −e, and the surrounding −e or +e was equivalent to the composition of an electric field vortex and an electron. Electrons moving around a spherical orbit were found to have positive charges under a strong electric field but negative charges under a weak field, mainly because the cross-sectional area of the flux was very small. In plasma jets, striations are a phenomenon that may occur when charges gather in the presence of an electric or gauge field. A plasma striation can occur if the effective charge exceeds a critical value determined by setting the derivative of the effective charge to zero, but only if the electric field lines passing through the striation are connected.

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Time- and spatially resolved emission spectroscopy of the dielectric barrier discharge for soft ionization sustained by a quasi-sinusoidal high voltage

et al. 2015

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A helium capillary dielectric barrier discharge was investigated by means of time-resolved optical emission spectroscopy with the aim of elucidating the process of the formation of the plasma jet. The helium emission line at 706 nm was utilized to monitor spatial and temporal propagation of the excitation of helium atoms. The discharge was sustained with quasi-sinusoidal high voltage, and the temporal evolution of the helium atomic emission was measured simultaneously with the discharge current. The spatial development of the plasma was investigated along the discharge axis in the whole region, which covers the positions in the capillary between the electrodes as well as the plasma jet outside the capillary. The high voltage electrode was placed 2 mm from the capillary orifice, and the distance between the ground and high voltage electrode was 10 mm. The complete spatiotemporal grid of the development of the helium excitation has shown that during the positive half-period of the applied voltage, two independent plasmas, separated in time, are formed. First, the early plasma that constitutes the plasma jet is formed, while the discharge in the capillary follows subsequently. In the early plasma, the helium atom excitation propagation starts in the vicinity of the high voltage electrode and departs from the capillary towards the ground electrode as well as several millimeters outside of the capillary in the form of the plasma jet. After relatively slow propagation of the early plasma in the capillary and the jet, the second plasma starts between the electrodes. During the negative voltage period, only the plasma in the capillary between the electrodes occurs.

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Measurement of optical signals as a plasma propagation in the atmospheric pressure plasma jet columns

Cited by 5 publications

References 18 publications

Plasma bioscience and its application to medicine

Plasma bioscience and its application to medicine

Patterns of Plasma Bullet in Plasma Jets

Time- and spatially resolved emission spectroscopy of the dielectric barrier discharge for soft ionization sustained by a quasi-sinusoidal high voltage

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