Plasma thermal radiofrequency

Hydrogen Cyanide Synthesis in a Thermal Radiofrequency Induction Plasma... 

Radiofrequency Induction Plasma. One convenient approach to achieve the required temperatures in excess of 10,000 °K. at atmospheric pressure is generation of a thermal plasma by radiofrequency induction heating. The techniques for generating and containing a stable high-temperature induction plasma have been described in detail by Reed (32, 33), Mironer (25), Marynowski and Monroe (24), Freeman and... 

Non-Thermal Radiofrequency Discharges Capacitive and Inductive Coupling of Plasma... 

In our laboratory, we find that the plasma reaction of trifiuoro-methyl radicals with mercuric iodide is an excellent source of bis(tri-fluoromethyDmercury. For those laboratories that lack access to radiofrequency (rf) equipment (a 100-W, rf source can at present be purchased for less than 1,000), synthesis of bis(trifluoromethyl)mercury by the thermal decarboxylation of (CFgCOjlzHg is also a functional, and quite convenient, source of bis(trifiuoromethyl)mercury (23). 

Ullrafine particles (UFPs) of metal and semiconductor nitrides have been synthesized by two major techniques one is the reactive gas condensation method, and the other is the chemical vapor condensation method. The former is modified from the so-called gas condensation method (or gas-evaporation method) (13), and a surrounding gas such as N2 or NII2 is used in the evaporation chamber instead of inert gases. Plasma generation has been widely adopted in order to enhance the nitridation in the particle formation process. The latter is based on the decomposition and the subsequent chemical reaction of metal chloride, carbonate, hydride, and organics used as raw materials in an appropriate reactive gas under an energetic environment formed mainly by thermal healing, radiofrequency (RF) plasma, and laser beam. Synthesis techniques are listed for every heal source for the reactive gas condensation method and for the chemical vapor condensation method in Tables 8.1.1 and 8.1.2, respectively. 

Contrary to the above mentioned technologies, which are based on arc plasma furnaces, a radiofrequency (RF) plasma system can process fine powders without granulation in a continuous operation. This possibility, together with the advantageous features of the thermal plasmas mentioned above, offer great perspectives for the synthesis of special ceramic powders such as spinel ferrites [5]. The RF plasma treatment produces nanosized metal and/or oxide powders depending on the parameters of processing. In this paper application of an RF thermal plasma system for the treat-... 

The desired thickness of the film for the solar sail application was 2.5 ym, but the thinnest commercially available film of this type was Du Font s Kapton O) with a thickness of <7.5 ym. Hence, a need existed to thin the latter film and to assess the photo-and thermal stability of the resulting, thinned film. This paper describes the use of a radiofrequency (RF) oxygen plasma for etching (thinning) of poly[, N-oxydiphenylene) pyromellitimide] (POP) film, and presents data on the photo/thermal degradation of etched and unetched film in vacuum. Although plasma etching has been applied to many polymers, it has scarcely been used on... 

T. (2003) Formation of highly oriented hydroxyapatite in hydroxyapatite/titanium composite coatings by radiofrequency thermal plasma spraying. / Mater. Sci. Mater Med., 14 (10), 919-922. 

Alnminnm can be produced from alumina (AI2 O3) using CO, CH4, or ly drogen as reduction agents. Plasma jets are arranged based on atmospheric-pressure ares (Stokes, 1971) as well as thermal atmospheric-pressure radiofrequency (RF) discharges (Rykalin Sorokin,... 

Radiofrequency arc (RF arc) has also been used for removzd of particles of material from the sample surface. In this system a modified ICP torch is used, and the sample is in electrical contact with a ground copper base. The base is water-cooled and argon flow is introduced at the base. A stable filament from the plasma forms between the induction region and the sample, when the plasma discharge is initiated. Boron nitride is used as thermal and electrical insulator between the base and the RF arc. 

Thermal plasmas have been used for decades as a source of heat for gas-phase reactions. The use of a radiofrequency (RF) plasma has been investigated at a laboratory level for the production of very fine powders of oxides and to a greater extent for nonoxides such as nitrides and carbides (110). The process parameters that control the powder characteristics are the frequency and power level of the plasma source, the temperature of the plasma jet, the flow rate of the gases, and the molar ratio of the reactants. While powders with high purity and very fine particle size (e.g., 10-20 nm) can be produced by this method, a major problem is that the powders are highly agglomerated. 

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