900‐MHz Nonthermal Atmospheric Pressure Plasma Jet for Biomedical Applications

Abstract

A portable microwave‐excited atmospheric pressure plasma jet (APPJ) using a coaxial transmission line resonator is introduced for applications of plasma biomedicine. Its unique feature includes the portability and no need for matching network and cooling system with high power efficiency, operating at 900 MHz with low ignition power less than 2.5 W in argon at atmospheric pressure. The temperature at the downstream of the APPJ stays less than 47 °C (≈320 K) during 5 min of continuous operation. The optical emission spectrum of the APPJ shows various reactive radicals such as OH, NO, and O which are responsible for biomedicine. The APPJ was applied to investigate the acceleration of blood coagulation, which occurred within 20 s of plasma treatment in vitro and within 1 min in vivo. This is significantly faster than the natural coagulation.

Inhibitory effect of double atmospheric pressure argon cold plasma on spores and mycotoxin production ofAspergillus nigercontaminating date palm fruits

“…The argon double jet plasma was blown into ambient air resulting in interaction of plasma with air leading to the formation of energetic charged particles, oxygen reactive species, hydroxyl radicals species (OH − ) in addition to excited argon species. Moreover, strong argon emission lines from 690 nm to 850 nm and atomic oxygen radical line (777.4 nm) are generated . As a result, a strong argon emission lines from 690 nm to 850 nm and atomic line (777.4 nm) is generated, and OH radical is presented at 305–312 nm.…”

“…Moreover, strong argon emission lines from 690 nm to 850 nm and atomic oxygen radical line (777.4 nm) are generated. 28 As a result, a strong argon emission lines from 690 nm to 850 nm and atomic line (777.4 nm) is generated, and OH radical is presented at 305-312 nm. As well, the nitrogen second positive system 0-0 transition band at 337.2 nm was measured.…”

Cold DC-Operated Air Plasma Jet for the Inactivation of Infectious Microorganisms

“…With this in mind, a variety of different plasma sources have been developed. Most of them are either based on a dielectric barrier-type discharge [4]- [22] or can be described as a plasma jet, for example, [23]- [54]. Aside from these two methods, a variety of other approaches are being pursued, including corona and arc discharges [55]- [60].…”

Abnormal electron-heating mode and formation of secondary-energetic electrons in pulsed microwave-frequency atmospheric microplasmas

“…These microwave-induced microplasmas are important because they may be used to develop safe, portable, and long-lifetime devices capable of operating at atmospheric pressure. 8 The microplasmas generated in these studies showed unique properties such as highly energetic electrons, different discharge structures, enhanced transport of energetic electrons, and non-equilibrium characteristics. Moreover, an electron-heating mode and its transition, which are induced by changes in the input power and frequency, have been reported as in the cases of low-pressure discharges.…”