Bulletin of the American Physical Society
68th Annual Gaseous Electronics Conference/9th International Conference on Reactive Plasmas/33rd Symposium on Plasma Processing
Volume 60, Number 9
Monday–Friday, October 12–16, 2015; Honolulu, Hawaii
Session SF4: Plasma Surface Interactions II |
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Chair: Leigh Winfrey, University of Florida Room: 303 AB |
Friday, October 16, 2015 8:00AM - 8:15AM |
SF4.00001: ABSTRACT WITHDRAWN |
(Author Not Attending)
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SF4.00002: Excitation of Ion Acoustic Waves in Plasmas with Electron Emission from Walls A.V. Khrabrov, I.D. Kaganovich, Y. Raitses, D. Sydorenko, A. Smolyakov Various plasma propulsion devices exhibit strong electron emission from the walls either as a result of secondary processes or due to thermionic emission. To understand details of electron kinetics in plasmas with strong emission, we have performed kinetic simulations of such plasmas using EDIPIC code. We show that excitation of ion acoustic waves is ubiquitous phenomena in many different plasma configurations with strong electron emission from walls. Ion acoustic waves were observed to be generated near sheath if the secondary electron emission from the walls is strong. Ion acoustic waves were also observed to be generated in the plasma bulk due to presence of an intense electron beam propagating from the cathode. This intense electron beam can excite strong plasma waves, which in turn drive the ion acoustic waves. [Preview Abstract] |
Friday, October 16, 2015 8:30AM - 8:45AM |
SF4.00003: Computational model of electrode erosion in high-pressure moving arcs Vladimir Kolobov, Robert Arslanbekov, Valerian Nemchinsky, Alexander Rabinovich, Alexander Fridman We will present an overview of our efforts to develop computational model of electrode erosion for ultra-high pressure (10-100 atm), high current density ($\sim$ 10$^{9}$A/m$^{2})$ magnetically rotated arcs, which are used for gas heating at hypersonic testing facilities. The arc roots move along internal surfaces of copper electrodes in the form of hollow cylinders. The electrode erosion process at high pressures has many common features with the cold electrode erosion of the vacuum arcs with account for the gas-dynamic effects on the electrode-vapor plasma jets generated due to Maecker effect. We will show results of simulations of the arc column rotation induced by the Lorentz force and by the swirling gas flows using adaptive mesh refinement (AMR) technique. Photographs of the arc root traces indicate micro-crater formation of the cathode surface at atmospheric pressure. We will discuss the applicability of the explosive electron emission model and the \textit{ecton (explosion center)} theory to describe electrode erosion of high-pressure arcs. [Preview Abstract] |
Friday, October 16, 2015 8:45AM - 9:00AM |
SF4.00004: Reaction pathway and mechanism for Gly-Gly and Ala-Ala under pulsed arc discharge on argon-water interface Ryota Miyanomae, Yuka Sakai, Yusuke Hirano, Armando Quitain, Mitsuru Sasaki, Kunio K, Tetsuo Honma Peptides are molecules having amino acid polymer structure, and are being used as health supplements, pharmaceutical products and sweeteners. In general, they are synthesized by using a condensing agent and enzymes. However, this conventional method has some drawbacks such as the need for a long reaction time and formation of large amounts of byproducts and wastes. To resolve this problem, this study aims to synthesize peptides by pulse discharge plasma under catalyst-free condition. Results showed that using alanylalanine (Ala-Ala) and glycylglycine (Ala-Gly) as raw materials, elongation reaction proceeded by the pulsed discharge at argon-water interface. Formation of oligomers was observed, while decomposition and addition products were also present. The reaction pathway was also elucidated from the obtained products. [Preview Abstract] |
Friday, October 16, 2015 9:00AM - 9:15AM |
SF4.00005: Surface Cross-linking Phenomena of Organic Films Treated by Argon Plasma KongDuo He, Qiongrong Ou Solution processed multilayer polymer light-emitting diodes (PLEDs) present challenges, especially regarding dissolution of the first layer during deposition of a second layer. We found a plasma approach to form cross-linked surfaces on organic films, which resist the corrosion of organic solvent, confirmed by the profilometer and fluorescence images. The cross-linking phenomenon is much related to the intrinsic chemical structure of the material. Plasma cross-linking technology may open up a new pathway towards fabrication of all-solution processed multilayer PLEDs. [Preview Abstract] |
Friday, October 16, 2015 9:15AM - 9:30AM |
SF4.00006: Rapid Production of Poly-N-Isopropylacrylamide with Nanopulsed Arc Discharge on Water-Argon Interface Yusuke Hirano, Mitsure Sasaki, Satoko Okubayashi Poly-($N$-Isopropylacrylamide) is well known about an exhibition of coil-to-globule transition below the lower critical solution temperature (32$^{\circ}$C) in aqueous media [1]. Because of this temperature near the human body, it has focused on as one of functional polymers available to industries [2]. However, the synthesis of PNIPAM has been conventionally conducted in combined harmful solvents for considerable long operating times. In this study, as a candidate technique for polymer productions, we challenged the use of pulsed discharge to the gas-liquid interface in order to generate reactive species such as radicals from water, initiator and argon gas, which can promote the radical polymerization of NIPAM and its production intermediates. We also discuss possible reaction mechanism based on the experimental results. \\[4pt] [1] M. Heskins, J. E. Guillet, \textit{J. Macromol. Sci. Chem.}, \textbf{1968}, 1441.\\[0pt] [2] J. C. Cuggino, C. B. Contreras, A. Jimenez-Kairuz, B. A. Malettp, C. I. Alvarez Igarzabal \textit{American Chemical Sciety}, \textbf{2014}, 11, 2239-2249. [Preview Abstract] |
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