Chemical vapor synthesis (CVS) of tungsten nanopowder in a thermal plasma reactor

2009 ◽  
Vol 27 (1) ◽  
pp. 149-154 ◽  
Author(s):  
Taegong Ryu ◽  
H.Y. Sohn ◽  
Kyu Sup Hwang ◽  
Zhigang Z. Fang
Keyword(s):  
Thermal Plasma ◽  
Plasma Reactor ◽  
Chemical Vapor ◽  
Chemical Vapor Synthesis

Nanoparticles generated by combining hot wall and microwave plasma chemical vapor synthesis

MRS Advances ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 213-218
Author(s):  
Alexander Levish ◽  
Markus Winterer
Keyword(s):  
Iron Oxide ◽  
Microwave Plasma ◽  
Plasma Reactor ◽  
Chemical Vapor ◽  
Process Window ◽  
Chemical Vapor Synthesis ◽  
Second Stage ◽  
Structure Surface ◽  
Oxide Phases ◽  
Precursor Decomposition

ABSTRACTControlling the oxidation state of iron and the crystal structure of iron containing compounds is the key to improved materials such as iron oxide nanoparticles for cancer treatment or heterogeneous catalysis. Iron oxides contain iron in different oxidation states and form different phases for one valence state (α-Fe3+2O2-3, β- Fe3+2O-32, etc.). Chemical vapor synthesis (CVS) allows the reproducible production of pure nanocrystals with narrow size distribution where particle formation and growth take place in the gas phase. Through the controlled variation of synthesis parameters CVS enables the synthesis of diverse iron oxide phases. In this study the energy for the CVS process is supplied by a hot wall furnace and a microwave plasma. The advantage of an plasma reactor as the first CVS stage is the fast and complete precursor decomposition at low temperatures. This results in a larger process window for the hot wall reactor in the second stage. The nanoparticles are examined regarding their structure, surface and valence by XRD and TEM.

Thermal Plasma Chemical Vapor Deposition of Superhard Nanostructured Si-C-N Coatings

2005 ◽  
Vol 880 ◽  
Author(s):  
Nicole J. Wagner ◽  
Megan J. Cordill ◽  
Lenka Zajickova ◽  
William W. Gerberich ◽  
Joachim V. R. Heberlein
Keyword(s):  
Mechanical Properties ◽  
Chemical Vapor Deposition ◽  
Thermal Plasma ◽  
Vapor Deposition ◽  
Plasma Reactor ◽  
Chemical Vapor ◽  
Optical Microscope ◽  
Nitrogen Plasma ◽  
Plasma Chemical ◽  
Plasma Chemical Vapor Deposition

AbstractA triple torch plasma reactor was used to synthesize Si—C—N composite films via the thermal plasma chemical vapor deposition process. The argon-nitrogen plasma provided atomic nitrogen to carbon- and silicon-based reactants, which were injected through a central injection probe and ring configuration. Films were deposited with variations of the total nitrogen flow through the torches (1.5-4.5slm), reactant mixture (silicon tetrachloride and acetylene or hexamethyldisilazane) and substrate material (silicon and molybdenum). Micro X-ray diffraction was used to determine that both α-Si3N4 and β-Si3N4 were dominant in most of the depositions. Composites of silicon nitride and silicon carbide were synthesized on molybdenum. The bonding of amorphous phases was investigated using Fourier transform infrared spectroscopy, which indicated the presence of N—H, CHx and CΞ in various films. Indentation tests on the polished film cross-sections determined that large variations in hardness and elastic modulus existed for minor changes in film composition. Correlations between indentation results and scanning electron and optical microscope images showed that the mechanical properties greatly depend on the film morphology; the denser, smoother, and more crystalline films tended to display enhanced mechanical properties.

scholarly journals Inactivation of airborne viruses using a packed bed non-thermal plasma reactor

2019 ◽  
Vol 52 (25) ◽  
pp. 255201 ◽  
Author(s):  
T Xia ◽  
A Kleinheksel ◽  
E M Lee ◽  
Z Qiao ◽  
K R Wigginton ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Plasma Reactor ◽  
Packed Bed ◽  
Non Thermal Plasma ◽  
Airborne Viruses

Nanocrystalline Zirconia Surface-Doped with Alumina: Chemical Vapor Synthesis, Characterization, and Properties

2001 ◽  
Vol 84 (12) ◽  
pp. 2771-2776 ◽  
Author(s):  
Vladimir V. Srdić ◽  
Markus Winterer ◽  
Andreas Möller ◽  
G. Miehe ◽  
Horst Hahn
Keyword(s):  
Chemical Vapor ◽  
Chemical Vapor Synthesis ◽  
Nanocrystalline Zirconia

Development of Fiber Bragg Grating (FBG) as Temperature Sensor Inside Packed-bed Non-thermal Plasma Reactor

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Siti Musliha Aishah Musa ◽  
RK Raja Ibrahim ◽  
Asrul Izam Azmi
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Variation ◽  
Thermal Plasma ◽  
Temperature Sensor ◽  
Plasma Reactor ◽  
Packed Bed ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Bragg Wavelength ◽  
Non Thermal Plasma

This paper presents early work on Fiber Bragg grating (FBG) as temperature sensor to monitor temperature variation inside a packed-bed non-thermal plasma reactor. FBG made from germania-doped fiber with center Bragg wavelength of 1552.5 nm was embedded inside non-thermal plasma reactor with sphere shape dielectric bead (barium titanate) and used to probe the temperature variation inside the reactor. The experimental works have proven that FBG is a suitable sensor to monitor temperature variation inside of reactor via LabVIEW program. Besides that, Optical Spectrum Analyzer (OSA) recorded Bragg wavelength shift as voltage of power supply increases, which indicate the non-uniform temperature variation occurring inside the reactor. However, it does not affect the chemical reaction inside the reactor because the temperature condition is in steady state.

Sign in / Sign up

Export Citation Format

Share Document