Exploration to generate atmospheric pressure glow discharge plasma in air

Abstract

Atmospheric pressure glow discharge (APGD) plasma in air has high application value. In this paper, the methods of generating APGD plasma in air are discussed, and the characteristics of dielectric barrier discharge (DBD) in non-uniform electric field are studied. It makes sure that APGD in air is formed by DBD in alternating current electric field with using the absorbing electron capacity of electret materials to provide initial electrons and to end the discharge progress. Through designing electric field to form two-dimensional space varying electric field and three-dimensional space varying electric field, the development of electron avalanches in airgap is suppressed effectively and a large space of APGD plasma in air is generated. Further, through combining electrode structures, a large area of APGD plasma in air is generated. On the other hand, by using the method of increasing the density of initial electrons, millimeter-gap glow discharge in atmospheric pressure air is formed, and a maximum gap distance between electrodes is 8 mm. By using the APGD plasma surface treatment device composed of contact electrodes, the surface modification of high polymer materials such as aramid fiber and polyester are studied and good effect of modifications is obtained. The present paper provides references for the researchers of industrial applications of plasma.

Study of Dielectric Barrier Discharge in Air and Estimation of Electron Density and Energy Deposition

“…1(a). The scale of electron avalanche exponentially increases and electron density near the anode becomes much larger than other regions (Liu et al, 2018). When a space charge field E SC is equal or greater than the external field E it causes the transition of avalanche to self-propagating ionized streamer at the anode as shown in Fig.…”

“…The DBD has been an interesting subject for many researchers because of its simplicity in operation and great potential in industrial applications. DBDs have been widely used in ozone generation (Pekarek, 2012;Tyata et al, 2016), surface treatment of materials (Liu et al, 2018), thin film deposition (Dong-Ling et al, 2018), air purification (Lopez-Fernandez et al, 2017), chemical reactions as chemical reactor (Tay et al, 2014), water treatment (Gyawali et al, 2018), biological applications. DBDs are also used in the design of high power CO 2 lasers, ultraviolet (UV) and vacuum ultraviolet (VUV) excimer lamps and plasma display panels (Yahila, 2016).…”

Experimental and numerical investigation on the uniformity of nanosecond pulsed dielectric barrier discharge influenced by pulse parameters

“…Most of the electric energy and the generated active particles are confined within those filaments, which can cause problems of low energy efficiency, inhomogeneous treatment, and local overheating in practical industrial applications [14]. To enhance the discharge uniformity, researchers usually adopt inert gases (He, Ar, etc) [15], optimize the electrode structure (mesh electrode, water electrode, etc) [16,17], choose proper dielectric materials (electret material, porous alumina ceramic, etc) [18,19], and introduce gas flow in the discharge gap to take off heat and impurity [20]. In recent years, with the development of pulsed power technology, the nanosecond (ns) power supply is widely used in plasma excitation and has demonstrated its potential for the generation of a controllable and uniform plasma source [21].…”

Effect of the Plasma Gas Type on the Surface Characteristics of 3Y-TZP Ceramic

“…Plasma modification is one way to alter the surface properties of biomaterials with high-energy ion bombardment through physical collisions or chemical reactions of the excited gas molecules [ 2 ]. Atmospheric-pressure glow discharge (APGD) plasma, especially cold atmospheric plasma (CAP), has recently attracted a great deal of interest for a variety of industrial and medical applications, such as surface processing [ 3 ], film deposition [ 3 ], ozone production for water purification [ 4 ], biomedical decontamination [ 4 ], wound healing [ 5 , 6 ], muscle regeneration [ 7 ], and cancer treatment [ 8 , 9 ], etc. CAP, also named non-thermal plasma (NTP), consists of a partially ionized gas that is not in the thermodynamic equilibrium.…”