Bulletin of the American Physical Society
67th Annual Gaseous Electronics Conference
Volume 59, Number 16
Sunday–Friday, November 2–7, 2014; Raleigh, North Carolina
Session CT3: Plasma Chemistry |
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Chair: Igor Adamovich, The Ohio State University Room: State D |
Tuesday, November 4, 2014 8:00AM - 8:15AM |
CT3.00001: Measurements of Nitric Oxide in a Plasma Generated by a Variable-Width, Constant Energy Discharge David Burnette, Igor Adamovich, Walter Lempert A diffuse plasma filament within a low pressure sphere gap was generated using a high voltage, solid state switch. For a constant pressure and overvoltage, the peak current and voltage drop were altered by a change in the ballast resistor while a simultaneous adjustment to the variable pulse width was used to maintain a constant pulse energy. The discharge parameters were chosen to result in a quasi-steady state discharge with near constant current and very little change in size and uniformity for each condition studied. The absolute density and temporal evolution of nitric oxide (NO) was measured via laser-induced fluorescence for each condition. The effect of the pulse characteristics and estimated E/N on the formation of NO are discussed. [Preview Abstract] |
Tuesday, November 4, 2014 8:15AM - 8:30AM |
CT3.00002: Characterization of Atmospheric Pressure Carbon Dioxide Dissociation in Arrays of Microplasma Channels by Emission Spectroscopy and Effluent Analysis Zhen Dai, Chul Shin, Sung-Jin Park, James Gary Eden Levied by rigorous regulations, the enormous cost of atmospheric carbon dioxide emission urged voracious demands on remediation technologies globally. Microplasma technology is being investigated as a new candidate to efficiently dissociate or remediate carbon dioxide contained in atmosphere. At a flow rate of 60 sccm of pure CO$_{\mathrm{2}}$ feedstock gas, dissociation degree of up to 14{\%} has been achieved with stable glow discharges in an array of Al/Al$_{\mathrm{2}}$O$_{\mathrm{3}}$ microplasma channels. In-situ characterizations of the effluent gases were conducted with residual gas analysis, gas chromatography, and infrared spectroscopy. Furthermore, time and spatially resolved emission spectroscopy recorded with an intensified charge-coupled device in the 300-800nm region revealed the excitation of CO and C$_{\mathrm{2}}$ species. The implications on the possible plasma chemistry and its reaction mechanisms in the microdischarge will be discussed. [Preview Abstract] |
Tuesday, November 4, 2014 8:30AM - 8:45AM |
CT3.00003: Plasma activated dissociation of CO$_{2}$ studied in a dielectric barrier discharge Richard Engeln, Florian Brehmer, Stefan Welzel, Bart Klarenaar, Richard van de Sanden The ever-increasing emission of carbon dioxide into the atmosphere as well as the intermittency problem of electricity produced by renewable energy sources are challenges that urgently need to be addressed. An approach addressing both issues at the same time is converting CO$_{2}$ to a fuel using plasma driven by electricity from renewable sources. We will present in this contribution the results of a study on the conversion of CO$_{2}$ to CO in a dielectric barrier discharge in pure CO$_{2}$ at pressures up to 1000 mbar: FTIR absorption and Raman spectroscopy were applied to measure CO number densities and gas temperatures as function of the specific injected energy. CO densities with a maximum at 10$^{18}$ cm$^{-3}$ (mixing ratio of 4.4{\%}) at 46 kJ/sl, energy efficiencies in the range of a few percent and gas temperatures up to 550 K were detected. The CO production is directly linked with the total number of transferred charges q during the residence time t$_{res}$ of CO$_{2}$ molecules. Also ozone has been detected with a maximum mixing ratio of 0.075{\%}. [Preview Abstract] |
Tuesday, November 4, 2014 8:45AM - 9:00AM |
CT3.00004: Core and afterglow plasma chemistry of a kHz-driven atmospheric-pressure plasma jet operated in ambient air Tomoyuki Murakami, Kari Niemi, Timo Gans, Deborah O'Connell, William Graham When atmospheric-pressure plasma jets (APPJs) are operated under an open-air condition, the plasma tends to produce numerous reactive species and the plasma-induced chemical reactions are complex. The purpose of this paper is to quantify the relevant reactive species, e.g. RONS, HxOy, NOx and HNOx, and to analyse their formation in the core and afterglow regions of helium-based kHz-driven APPJ by using a 0D time-dependent global simulation (comprising 1360 elementary reactions among 65 species) [1] as well as to compare the predictions with independent diagnostics. The interacting kinetics of long-lived and short-lived species is clarified. The metastable species, e.g. He* and He2*, positive ions, negative ions and electrons are strongly modulated at the driving frequency, while the most neutral reactive species are not. Those responses are influenced by the humid air fraction.\\[4pt] [1] T. Murakami et al Plasma Sources Sci. Technol. 22(2013)015003 / 22(2013)015003 / 23(2014)025005. [Preview Abstract] |
Tuesday, November 4, 2014 9:00AM - 9:15AM |
CT3.00005: On the Role of Metastable Argon in Cold Atmospheric Pressure Plasma Jets with Shielding Gas Device Ansgar Schmidt-Bleker, Jorn Winter, Joao Santos Sousa, Vincent Puech, Klaus-Dieter Weltmann, Stephan Reuter Shielding gas devices are a valuable tool for controlling the reactive species output of Cold Atmospheric Pressure Plasma (CAPP) Jets for biomedical applications. In this work we investigate the effect of different shielding gas compositions using a CAPP jet (kinpen) operated with argon. As shielding gas various mixtures of N$_{2}$ and O$_{2}$ are used. Metastable argon (Ar*) has been quantified using laser absorption spectroscopy and was identified as an important energy carrier in the CAPP jets effluent. The Ar* excitation dynamics was studied using phase resolve optical emission spectroscopy. Based on these findings a kinetic model for the gas phase chemistry has been developed that uses the Ar* density and dynamics as input and yields densities of O$_{3}$, NO$_{2}$, HNO$_{2}$, HNO$_{3}$, N$_{2}$O$_{5}$, H$_{2}$O$_{2}$ and N$_{2}$O produced by the CAPP jet for different shielding gas compositions. The results are in good agreement with Fourier-Transform Infrared Spectroscopy measurements on these species. [Preview Abstract] |
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