An atmospheric pressure plasma jet operated by injecting natural air

Abstract

This work proposes an atmospheric pressure plasma jet operated by the injection of natural air. The conventional plasma jet has been modified by creating a small hole in the quartz tube. The small amount of argon gas flow inside the tube creates a pressure difference with the surrounding environment. By Bernoulli's principle, natural air is forced to penetrate inside the tube to equalize this difference. The operational range of this device exists for only low argon gas flow rates of 200–600 sccm at a specified value of applied voltage. Compared to the conventional plasma jet without a hole, the concentration of reactive nitrogen species is significantly increased due to the mixing of the surrounding air. In addition, the gas temperature of the device remains close to room temperature, suggesting its strong possibility for biomedical applications. This approach can be an initiation towards the commercialization of plasma jets by using natural air.

Cold Atmospheric Plasma-Activated Water Irrigation Induces Defense Hormone and Gene expression in Tomato seedlings

“…These species originate from the collision of energetic electrons with nitrogen and oxygen molecules present in the ambient air 28 . OH radicals are emitted at approximately 306–309 nm and originated from the collision of electrons, or metastable nitrogen atoms, with water molecules 27,29 . Strong emissions from various bands of the nitrogen second positive system (N 2 SPS) are observed at 296 nm, 315 nm, 337 nm, 357 nm, and 380 nm.…”

“…The interaction of cold air plasma with water activates the production of different RONS in the water, which alters the chemical composition of water 29 . To determine the effect of CAP exposure on hydrogen ions concentration, the pH of water was measured at different time intervals after CAP exposure.…”

Cold atmospheric plasma generated reactive species aided inhibitory effects on human melanoma cells: an in vitro and in silico study

“…Between 200-300 nm, there are emissions from nitric oxide gamma (γ) band at various wavelengths of 236 nm, 246 nm, and 258 nm. These species are originated through the interaction of electrons as well as metastable atoms with oxygen and nitrogen molecules which are present in the air gas 18,19 . An emission from hydroxyl radical (OH • ) of a very short lifetime is observed from 306-309 nm due to the interaction of energetic electrons/metastable atoms with water molecules present in the feeding gas as well as the ambient environment.…”

“…OH • radicals are strong precursors for the formation of long-lived reactive species like hydrogen peroxide (H 2 O 2 ) 20 . There are also strong emissions from nitrogen second positive system (N 2 SPS) from 315-380 nm and from nitrogen first negative system (N 2 FNS) from 390-440 nm 18,19,21 . Excited nitrogen molecules not only combine with ambient oxygen molecules to form secondary reactive species but also they are able to dissociate water molecules and lead to the formation of OH • radicals 22 .…”

Plasma and Nanomaterials: Fabrication and Biomedical Applications

“…It was designed in order to extend the plasma plume at a long distance away from the discharge region, enabling the remote treatment of the sample. Extensive research works have been performed on the design of plasma jets for biomedical applications [6,7,8]. A schematic diagram of the plasma jet is as shown in Figure 2c.…”