scholarly journals Plasma energy efficiency in tip-to-plane air corona discharges at atmospheric pressure

2022 ◽  
Vol 115 ◽  
pp. 103642
Author(s):  
Karim Saber ◽  
Alyen Abahazem ◽  
Nofel Merbahi ◽  
Mohammed Yousfi
Keyword(s):  
Energy Efficiency ◽  
Atmospheric Pressure ◽  
Corona Discharges ◽  
Plasma Energy

scholarly journals Transfer Layers: A Comparison across SWNTs, DWNTs, Graphite, and an Ionic Fluid

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Randy L. Vander Wal ◽  
Kenneth W. Street ◽  
Kazuhisa Miyoshi
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Energy Efficiency ◽  
Coefficient Of Friction ◽  
Atmospheric Pressure ◽  
Improve Energy Efficiency ◽  
Moving Interfaces ◽  
Ball On Disc

Lubrication is the science of friction at moving interfaces. Nanomaterials acting as interfacial modifiers can minimize friction and thereby improve energy efficiency. To test this hypothesis, single- (SWNT) and double-walled (DWNT) carbon nanotubes and an ionic fluid are tested individually and compared to SWNTs and graphite as additives within the ionic fluid. The minimum coefficient of friction is correlated with the longest lifetime using a ball-on-disc tribometer, in air, at atmospheric pressure. Results are interpreted in terms of the nanotubes' mechanical properties and the formation of transfer layers upon the tribosurfaces.

scholarly journals Generation of Porous Alumina Layers in a Polydimethylsiloxane/Hydrogen Peroxide Medium on Aluminum Substrate in Corona Discharges

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
A. Groza ◽  
A. Surmeian ◽  
C. Diplasu ◽  
C. Luculescu ◽  
C. Negrila ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Photoelectron Spectroscopy ◽  
Atmospheric Pressure ◽  
Porous Alumina ◽  
Aluminum Substrate ◽  
Corona Discharges ◽  
Negative Corona ◽  
Alumina Layer ◽  
X Ray ◽  
Anodization Process

The porous alumina (Al2O3) layer obtained at the interface between polydimethylsiloxane/hydrogen peroxide medium and aluminum substrate under charged and neutral species injection produced in negative corona discharges in air at atmospheric pressure is analyzed by different methods in this paper. The scanning electron microscopy investigations showed the uniform distribution of the pores formed in the alumina layer and their columnar structures. Both energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) measurements indicate that during the anodization process of the aluminum in the polydimethylsiloxane/hydrogen peroxide medium in corona discharge the incorporation of silicon in the structure of the alumina layer is possible.

scholarly journals Degradation of glyphosate in water by the application of surface-corona-discharges

2021 ◽  
Author(s):  
Katja Zocher ◽  
Peter Gros ◽  
Matthias Werneburg ◽  
Volker Brüser ◽  
Juergen F. Kolb ◽  
...  
Keyword(s):  
Waste Water ◽  
Energy Efficiency ◽  
Degradation Rate ◽  
Liquid Surface ◽  
Treatment Time ◽  
Ammonium Molybdate ◽  
Photometric Method ◽  
Corona Discharges ◽  
Physical Plasma ◽  
Biological Methods

Abstract Glyphosate (GLP) is one of the most widely applied herbicide, which is found ubiquitously in the environment. The removal of glyphosate from waste water and soil is challenging and can be achieved with chemical or biological methods, which, nevertheless, suffer from different disadvantages. The application of a physical plasma for the removal of GLP in water was examined by the application of surface corona discharges in a wire-to-cylinder setup filled with argon. The plasma was ignited at the liquid surface without any additives. By applying a photometric method, GLP was detected after derivatisation with fluorenyl methoxycarbonyl chloride, whereas phosphate was determined with ammonium molybdate. A GLP degradation rate of 90.8% could be achieved within a treatment time of 30 minutes with an estimated energy efficiency of 0.32 g/kWh.

Reduction of perfluorinated compound emissions using atmospheric pressure microwave plasmas: Mechanisms and energy efficiency

2006 ◽  
Vol 78 (6) ◽  
pp. 1173-1185 ◽  
Author(s):  
M. Nantel-Valiquette ◽  
Y. Kabouzi ◽  
E. Castaños-Martinez ◽  
K. Makasheva ◽  
M. Moisan ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Atmospheric Pressure ◽  
Swirling Flow ◽  
Excitation Frequency ◽  
Soda Lime ◽  
Gas Mixture ◽  
Microwave Plasmas ◽  
Nitrogen Gas ◽  
Perfluorinated Compound ◽  
Microwave Excitation

The abatement of perfluorinated compound (PFC) gases is investigated using atmospheric pressure microwave-surface-wave plasmas. These PFCs are diluted in nitrogen gas with concentration ranging from 5000 to 10 000 ppmv. The abatement mechanisms of SF6 and CF4 are examined, and conversion schemes are presented in the case where oxygen is added to the gas mixture. The PFC fragments are oxidized, forming acid-like by-products that are finally trapped irreversibly using a humidified soda lime scrubber. Gas-phase analysis was performed using Fourier transform infrared (FTIR) spectroscopy. The abatement efficiency is found to increase with increasing absorbed microwave power and gas residence time. The energy efficiency of the abatement process is shown to increase, with PFC concentrations in the gas mixture up to 10 000 ppmv. A complete conversion of SF6 is achieved for energy densities ranging from 700 to 1200 J/cm3 for concentrations ranging from 5000 to 10 000 ppmv. Lowering the microwave excitation frequency and using swirling flow are shown to reduce the energy cost per abated molecule.

Electrical Analysis of Pulsed Positive Multipoint Corona Discharges in Air at Atmospheric Pressure

2011 ◽  
Vol 39 (11) ◽  
pp. 2230-2231 ◽  
Author(s):  
A. Abahazem ◽  
A. Mraihi ◽  
N. Merbahi ◽  
M. Yousfi ◽  
O. Eichwald
Keyword(s):  
Atmospheric Pressure ◽  
Corona Discharges ◽  
Electrical Analysis

Progress in the Visualization of Filamentary Gas Discharges. Part 2: Visualization of DC Positive Corona Discharges

2004 ◽  
Vol 7 (1) ◽  
Author(s):  
Jerzy Mizeraczyk ◽  
Seiji Kanazawa ◽  
Toshikazu Ohkubo
Keyword(s):  
Atmospheric Pressure ◽  
Recent Progress ◽  
Cross Correlation ◽  
Correlation Spectroscopy ◽  
Dielectric Barrier Discharges ◽  
Corona Discharges ◽  
Dielectric Barrier ◽  
Gas Discharges ◽  
New Applications ◽  
Barrier Discharges

AbstractRecently the filamentary gas discharges at atmospheric pressure, such as dielectric-barrier and corona discharges regained their importance due to numerous new applications. These new applications impose a demand of better understanding of the fundamentals of the filamentary discharges. As a consequence, during the last ten years an essential progress in the diagnostics of the filamentary discharges has been made. The recent progress in the investigations of the dielectric-barrier discharges by cross-correlation spectroscopy was described in Part 1 of this paper. Part 2 is a survey of the recent progress in the visualization of DC positive corona discharges.

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