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Plasma bioscience for medicine, agriculture and hygiene applications
최은하,Kaushik NAgendra Kumar,Hong Young June,임준섭,최진성,한인 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.8
Nonthermal biocompatible plasma (NBP) sources operating in atmospheric pressure environments and their characteristics can be used for plasma bioscience, medicine, and hygiene applications, especially for COVID-19 and citizen. This review surveyed the various NBP sources, including a plasma jet, micro-DBD (dielectric barrier discharge) and nanosecond discharged plasma. The electron temperatures and the plasma densities, which are produced using dielectric barrier discharged electrode systems, can be characterized as 0.7 ~ 1.8 eV and (3–5) × 1014– 15 cm− 3, respectively. Herein, we introduce a general schematic view of the plasma ultraviolet photolysis of water molecules for reactive oxygen and nitrogen species (RONS) generation inside biological cells or living tissues, which would be synergistically important with RONS diffusive propagation into cells or tissues. Of the RONS, the hydroxyl radical [OH] and hydrogen peroxide H2O2 species would mainly result in apoptotic cell death with other RONS in plasma bioscience and medicines. The diseased biological protein, cancer, and mutated cells could be treated by using a NBP or plasma activated water (PAW) resulting in their apoptosis for a new paradigm of plasma medicine.
Numerical Simulation of Streamer Physics in Nanosecond Pulsed Surface Discharges
안상준,채정헌,김형진,김규홍 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.3
Two-dimensional numerical simulations of a nanosecond pulsed single dielectric barrier discharge (SDBD) are performed in air. Streamers produced in nanosecond SDBDs have filamentary properties and generate a strong electric field and high-density gradient of charged particles. This results in non-equilibrium effects of electrons, which makes analysis of the plasma physics challenging. To simulate the streamer discharge, a 17-species hydrodynamic plasma model is used, including an air chemistry scheme with ions and neutral species in thermal equilibrium and electrons in thermal non-equilibrium. We investigate the charged particles, the electric field and the electron energy (i.e. electron temperature) created due to collisions between high-energy particles and understand the physics of discharge. The electric field and the electron energy have different physical properties depending on the plasma generation regions (streamer head, streamer body, or sheath), and these discharge physics are consistent with the observations of other studies. Electron energy results obtained assuming non-equilibrium and equilibrium of electrons are compared to confirm the non-equilibrium effects of electrons in the streamer head and sheath. This effect is attributed to the locally large electric field gradient in the streamer head and sheath.