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The frequency effect on atmospheric pressure RF discharge surface modification
Heon-Ju Lee,A.F. Alexandrov,E.A. Kralkina,V.B. Pavlov,V.P. Savinov,V. Yu. Sergeenko,I.B. Timofeev,G.E. Bugrov,K.V. Vavilin,V. Yu. Plaksin,Young Son Mok 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.1
The physical mechanism of RF discharge at atmospheric pressure was studied at discharge frequencies of 13.56MHz and 0.6MHz. The discharge at 0.6 MHz had a clear filamentary structure, while discharge at 13.6 MHz had no separate filaments. The influence of discharge on the properties of polymer surfaces was also investigated, using two surface property indicators, the contact angle with water and adhesion strength. As a result of sample processing in the discharge, the wetting angle of polytetrafluorethylene (PTFE), polyethylene (PE), polyimide (PI) and polyvinyl chloride (PVC) decreased to 40o, 20o, 20o and 25o, respectively, and the adhesion of PTFE increased four fold. The physical mechanism of RF discharge at atmospheric pressure was studied at discharge frequencies of 13.56MHz and 0.6MHz. The discharge at 0.6 MHz had a clear filamentary structure, while discharge at 13.6 MHz had no separate filaments. The influence of discharge on the properties of polymer surfaces was also investigated, using two surface property indicators, the contact angle with water and adhesion strength. As a result of sample processing in the discharge, the wetting angle of polytetrafluorethylene (PTFE), polyethylene (PE), polyimide (PI) and polyvinyl chloride (PVC) decreased to 40o, 20o, 20o and 25o, respectively, and the adhesion of PTFE increased four fold.
Deposition of ZnO Films on an Acryl Substrate Using a DC Arc Plasmatron
Oleksiy V. Penkov,Vadim Yu. Plaksin,Min Gook Ko,Chanjoo Yim,이현주 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The DC arc plasmatron deposition of ZnO films on acryl substrates was demonstrated. The structure and the optical properties of the films were investigated. The XRD measurements revealed that the crystalline structure of the films depended on the deposition pressure. At atmospheric pressure, the deposited films were amorphous, and decreasing pressure led to the formation of polycrystalline films. The optical transmittance of the films was around 90 % in the visible region. We showed that minimal substrate heating could be achieved by varying the deposition parameters.
Application of the DBD in the Cleaning of Diesel Engine Exhausts
이현주,Oleksiy V. Penkov,Vadim Yu. Plaksin 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Various dielectric barrier discharge (DBD) plasma sources were used to reduce the NOx content of diesel engine exhaust. Discharge frequencies were varyied from 400 Hz to 28.5 kHz. Soot filters were used to control the effect of the discharge on the particle content in the engine emissions. A 95 % decrease in NO and a 70 % reduction in NOx were obtained. We found that the application of a discharge increased the efficiency of carbon-particle removal by 1.4 times. Various dielectric barrier discharge (DBD) plasma sources were used to reduce the NOx content of diesel engine exhaust. Discharge frequencies were varyied from 400 Hz to 28.5 kHz. Soot filters were used to control the effect of the discharge on the particle content in the engine emissions. A 95 % decrease in NO and a 70 % reduction in NOx were obtained. We found that the application of a discharge increased the efficiency of carbon-particle removal by 1.4 times.
Lee, Heon-Joo,Riaby, V.A.,Plaksin, V.Yu. 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.2
Phenomenon of discharge current diversion by conductive parts, or bodies in contact with discharge plasmas has been studied experimentally. Such a body was represented here by a set of wall mac(metal discs 4 mm in diameter) distributed along a plasma formation. The last was generated in a vacuum chamber in the form of a plasma flow from a DC arc plasmatron. Each macroprobe could be considered as a big conductive body in contact with discharge plasmas. But peculiarities of their interaction with plasma could be studied in details for bigger conductive bodies in the form of short-circuited macroprobes. In the present work plasma potential and therefore floating potential changed very little along the set of the probes. So the said unification was undertaken for the probes with the biggest difference of floating potentials. It was found out experimentally that a big conductive body in contact with discharge plasmas acquired single floating potential a little higher than the lowest floating potential for an individual probe in a big conductive body containing two short-circuited macroprobes. Besides electric current was measured in a jumper connecting two individual probes. More than that double-probe characteristic of the mentioned two individual probes was registered. All these experimental facts coincided exactly with the conclusions of previously published works where double-probe approach for the analysis of a big conductive body's behaviour in contact with discharge plasmas was applied intuitively, based on general physical notions. And the outlook of the experimental double-probe characteristic turned out to be the same as an imaginary curve plotted only on the basis of general physical notions.