Simulation of the Carbon Synthesis Process in Atmospheric-Pressure Microwave Discharge in an Argon–Ethanol Gas Mixture

2021 ◽  
Vol 55 (6) ◽  
pp. 525-530
Author(s):  
O. G. Napalkov ◽  
A. I. Saifutdinov ◽  
A. A. Saifutdinova ◽  
B. A. Timerkaev
Keyword(s):  
Atmospheric Pressure ◽  
Microwave Discharge ◽  
Synthesis Process ◽  
Gas Mixture

scholarly journals Application of non-equilibrium plasmas in medicine

2012 ◽  
Vol 77 (12) ◽  
pp. 1689-1699 ◽  
Author(s):  
Zoran Petrovic ◽  
N. Puac ◽  
G. Malovic ◽  
S. Lazovic ◽  
D. Maletic ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Medical Applications ◽  
Gas Mixture ◽  
Oxygen Species ◽  
Special Issue ◽  
Plasma Sources ◽  
Volatile Organic ◽  
Plasma Needle ◽  
Group A ◽  
Non Equilibrium

We review the potential of plasma medical applications, the connections to nanotechnologies and the results obtained by our group. A special issue in plasma medicine is the development of the plasma sources that would achieve non-equilibrium at atmospheric pressure in atmospheric gas mixture with no or only marginal heating of the gas, and with desired properties and mechanisms that may be controlled. Our studies have shown that control of radicals or chemically active products of the discharge such as ROS (reactive oxygen species) and/or NO may be used to control the growth of the seeds. At the same time specially designed plasma needle and other sources were shown to be efficient to sterilize not only colonies of bacteria but also planctonic samples (microorganisms protected by water) or bio films. Finally we have shown that plasma may induce differentiation of stem cells. Non-equilibrium plasmas may be used in detection of different specific markers in medicine. For example proton transfer mass spectroscopy may be employed in detection of volatile organic compounds without their dissociation and thus as a technique for instantaneous measurement of the presence of markers for numerous diseases.

scholarly journals In Situ Investigation of the Formation Kinematics of Plasma-Generated Silver Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 555 ◽  
Author(s):  
Daniel Tasche ◽  
Mirco Weber ◽  
Julia Mrotzek ◽  
Christoph Gerhard ◽  
Stephan Wieneke ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Atmospheric Pressure ◽  
Nanoparticle Synthesis ◽  
Atmospheric Pressure Plasma ◽  
Spherical Particles ◽  
Synthesis Process ◽  
Plasma Exposure ◽  
Pressure Plasma ◽  
In Situ Investigation

In this publication, it is shown how to synthesize silver nanoparticles from silver cations out of aqueous solutions by the use of an atmospheric pressure plasma source. The use of an atmospheric pressure plasma leads to a very fast reduction of silver ions in extensive solvent volumes. In order to investigate the nanoparticle synthesis process, ultraviolet/visible (UV/VIS) absorption spectra were recorded in situ. By using transmission electron microscopy and by the analysis of UV/VIS spectra, the kinetics of silver nanoparticle formation by plasma influence can be seen in more detail. For example, there are two different sections visible in the synthesis during the plasma exposure process. The first section of the synthesis is characterized by a linear formation of small spherical particles of nearly constant size. The second section is predominated by saturation effects. Here, particle faults are increasingly formed, induced by changes in the particle shape and the fusion of those particles. The plasma exposure time, therefore, determines the shape and size distribution of the nanoparticles.

Plasma Surface Modification of Glass Fibre Sizing for Manufacturing Polymer Composites

2020 ◽  
Vol 843 ◽  
pp. 159-164
Author(s):  
Yukihiro Kusano ◽  
Daan Jonas Hottentot Cederløf ◽  
Søren Fæster
Keyword(s):  
Plasma Treatment ◽  
Ultrasonic Irradiation ◽  
Glass Fibre ◽  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Fibre Bundle ◽  
Fluorine Content ◽  
Gas Mixture ◽  
Dielectric Barrier Discharge Plasma ◽  
Barrier Discharge Plasma

Bundles or fabrics of sized glass fibres were treated by a dielectric barrier discharge plasma in a He/CF4 gas mixture at atmospheric pressure with and without ultrasonic irradiation. The plasma treatment introduced fluorine both inside and outside of the fibre bundle, decreasing wetting of glycerol. Ultrasonic irradiation markedly increased the fluorine content as well as the silicon, calcium, and aluminium contents, indicating simultaneous fluorination and preferential etching of organic components. It is indicated that plasma treatment in a He/CF4 gas mixture can be used for controlling the surface properties of glass fibre bundles, and that ultrasonic irradiation can enhance functionalization and etching.

Polarity Control of CVD Grown 3C-SiC on Si(111)

2011 ◽  
Vol 679-680 ◽  
pp. 91-94
Author(s):  
Jörg Pezoldt ◽  
Bernd Schröter
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Hydrogen Gas ◽  
Gas Mixture ◽  
Surface Polarity ◽  
Polar Material ◽  
Face Surface ◽  
First Case ◽  
Low Pressures

XPD and XRD measurements revealed a difference in the crystallographic polarity of 3C-SiC(111) grown on Si(111) carbonized by ethene diluted in hydrogen at atmospheric pressure in a rapid thermal chemical vapour deposition reactor and the crystallographic polarity of 3C-SiC(111) formed in an ethene hydrogen gas mixture at low pressures. In the first case C-face polar material was formed, whereas in the second case the grown expitaxial layer exhibits Si-face surface polarity.

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