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Summary form only given. In this work, a polymer film deposition system based on plasma-polymerization technique is developed by using an atmospheric pressure floating electrode dielectric barrier discharge (DBD) jet, as shown in Fig. 1. Helium with small admixtures of polymer precursors is used as the working gas in the DBD system to achieve plasma polymerization. A floating electrode configuration...
Summary for only given. Parylene C is a widely used polymer when a high-quality protective layer is needed. It has excellent bulk properties that make it a popular choice for a wide array of areas that includes dielectric applications, biomedicine and micro-electromechanical systems (MEMS). Nonetheless, under traditional deposition its poor adhesion to a broad range of substrates remains a main concern...
Summary form only given. The electrical and emission properties of a capillary DBD (Cap-DBD) plasma in atmospheric pressure air are reported in this work. The plasma reactor consists of metal wire electrodes inside quartz capillary tubes powered with a low kilohertz frequency AC high voltage power supply. Various reactor geometries (planar, 3-D multilayer, and circular) with no gap spacing up to a...
To increase the efficiency of the plasma assisted material processing with help of the capacitively coupled plasma discharge frequency of the driven field and spatial size of the modern devices tend to higher values. This can lead to a stronger influence of the electromagnetic effects, which in turn can affect the plasma uniformity, one of the most important parameters in such a technology. To assess...
Summary form only given. The application of low pressure plasma discharges for sterilization of medical instruments is an upcoming alternative to common sterilization methods, due to the variety of drawbacks, e.g. high temperature, toxic chemical agents, or the inability to sterilize and remove pathogenic material, commonly used methods are associated with. Plasma sterilization offers a highly effective,...
Electrothermal plasma sources have numerous applications including hypervelocity launchers, fusion reactor pellet injection, and space propulsion systems. The time evolution of important plasma parameters at the source exit is important in determining the suitability of the source for different applications.
Research into atmospheric pressure plasma jets (APPJs) that are initiated via a self-sustaining streamer discharge has recently been driven by both their potential for applications to nonthermal material processing, and fundamental questions regarding the basic discharge mechanisms that drive this remarkably stable atmospheric pressure discharge. We have characterized a streamer-initiated atmospheric...
A distinctive property of partially ionized plasmas is that such plasmas are always in a non-equilibrium state: the electrons are not in thermal equilibrium with the neutral species and ions, and the electrons are also not in thermodynamic equilibrium within their own ensemble, which results in a significant departure of the electron velocity distribution function from a Maxwellian. These non-equilibrium...
Summary form only given. Poor initiation could be the reason that some plasma focus devices show a poor reproducibility shot to shot. A recent publication by Verma et al suggests that operating a small plasma focus at higher repetition rates increase the neutron yield for a given stored energy by as much as 10 x. It is hypothesized that the residual ionization from one pinch helps better initiate...
Summary form only given. This contribution deals with the time resolved diagnostics of a non thermal plasma source initially developed at GREMI for biomedical applications. The set up, designed as Plasma Gun1, consists in a cylindrical Dielectric Barrier Discharge reactor flushed with neon or helium at flow rates of a few tens of cm^.min"1, and powered by fast rising voltage pulse of nanosecond...
Summary form only given. The fast ionization wave (FIW) resulting from nanosecond pulsed discharge at very high overvoltage provides an excellent high reduced electric field (E/N) example discharge due to its spatial uniformity. A comprehensive model of FIW would provide insight into other high E/N discharges used for plasma ignition applications, such as DBD and streamer discharge. To that end the...
Summary form only given. Results are presented from experimental studies of Dielectric Barrier-Discharge (DBD) Excilamp in Mixtures of Krypton and Molecular Chlorine KrCl* excilamp excited by pulsed discharge. The oscillograms of the applied voltage, total current, displaced charge, output irradiance are presented. The effect of chlorine on the UVC irradiance is presented.
Routinely functioning capillary discharge-based soft X-ray lasers are pumped exclusively according to electron-collisional excitation pumping scheme on Ne-like ions. Scaling down their wavelength has been unsuccessful because it needs homogeneously pre-filled capillary with metal-vapourions like Ag (lasing wavelength of Ni-like Ag ion is 14.0 nm), Cd(13.2nm), In (12.6 nm), Sn(12.0nm) what is difficult...
Summary form only given. Distribution of matter in the discharge channel formed upon a nanosecond electrical explosion of Al wire in vacuum was studied experimentally and theoretically. Simultaneous use of optical and UV diagnostics and numerical results made it possible to distinguish qualitatively different regions of the discharge channel, such as the current-carrying plasma layers and the region...
Summary form only given. The pulsed power technology has been studied for applying to the degradation of the air and water pollutant, such as NOx, VOC and detergent, using non-thermal plasma. In many case, a wire-cylindrical electrode is used for a reactor. For achieving high throughput in the treatment, the volume of the reactor using for these environmental application has to be large. However,...
Summary form only given. In the past decade a number of inventive sources of atmospheric pressure non-equilibrium plasma have been introduced. Motivated by specific kinds of applications, these sources generate non-equilibrium plasmas that are either confined by electrodes or unbounded plasmas in the form of plasma-jets. In this paper the physics of these discharges is explored, with particular interest...
High voltage pulse discharge plasma can remove natural organic matter (NOM) and produce no production of toxic by-products. Fulvic acid solution was treated by high voltage pulse discharge plasma in this paper. It was shown that because of the thermolysis and oxidation, with the increase of peak voltage and fulvic acid solution concentration, the pH and ORP of solution decreased gradually, meanwhile...
The paper presents a detailed explanation of the physical mechanism of the nanosecond pulsed surface dielectric barrier discharge (SDBD) effect on the flow. Actuator-induced gas velocities show near-zero values for nanosecond pulses. The measurements performed show overheating in the discharge region at fast (τ ~ 1 us) thermalization of the plasma inputed energy. The mean values of such heating of...
Summary form only given. The goal of this study is to explore the fundamental physics and formation mechanism of hydrogen plasmas, which is driven by a nano-second scale pulsed voltage under high pressure. A 1d2v (one dimensional in space and two dimensional in velocity) particle-in-cell simulation program for electrostatic plasmas has been developed for this purpose. Monte Carlo collisions with a...
The evolution of microplasmas, based on the increasing demand for miniaturization of instruments and components has generated significant interest in the development of small size plasmas which can be integrated into bio-chips for sensing and detection applications. Microplasmas are cost effective and highly efficient electrical discharges operated at pressures greater than several hundreds of Torr...
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