Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session GM2: Workshop IV: Catalytic Effects in Plasma-Liquid Interaction |
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Chair: Hiromasa Tanaka, Nagoya University Room: Sendai International Center Shirakashi 2 |
Monday, October 3, 2022 1:30PM - 2:15PM |
GM2.00001: Plasma Bubbles: A Route to Green Chemistry Invited Speaker: Renwu Zhou The interface between plasma and liquid plays an important role in the mass transfer and formation of reactive oxygen and nitrogen species in liquids. The plasma bubbles provide a large interaction surface area and also reduce the breakdown voltage and energy consumption of water activation. Our goal is to replace chemicals or energy from the burning of carbon-based fuels with supplies of "green" electrons. This presentation will fully describe the plasma bubble technology from the aspects of plasma characteristics, gas-liquid mass transfer and green chemistry applications. Example One will focus on the plasma bubbles-enabled water purification, which will emphasize the significance of plasma bubble characteristics for transfering plasma reactive species in water; Example Two will focus on the plasma bubbles for ROS production (H2O2), with the further improvement of H2O2 yield by photocatalysis; Example Three will focus on the the plasma bubbles for RNS production (NOx) and the combination of electrochemical catalysis for ammonia production. Overall, the presentation will summarize the advances of our recent studies in the plasma bubble technology and outline some outlooks in future researchs. |
Monday, October 3, 2022 2:15PM - 3:00PM |
GM2.00002: Graph-based approach to catalytic effects in plasma-exposed liquids Invited Speaker: Tomoyuki Murakami Cold atmospheric plasmas (CAPs) have been widely studied in the fields of biomedicine or agriculture. In these applications, plasma- Cold atmospheric plasmas (CAPs) have been widely studied in the fields of biomedicine or agriculture. In these applications, plasma-activated liquids/solutions are gaining increasing attention because they can produce abundant reactive species. Because there are various combinations of the CAP source and the type of solution used, we still have some challenges to reach comprehensive understanding of the nature of CAP-induced chemistry in liquids/solutions. This study propose mathematical/numerical approaches to investigate the CAP-liquid interaction. The complex network analysis based on the graph-theory, one of the information mathematics, enable us to reveal the hidden feature of liquid-phase chemistry through the visualization and centrality-based identification of the reacting network structure [1, 2]. Particular emphasis will be placed on examining the catalytic effect. Numerical simulation will quantify the influence of CAP irradiation on the chemistry in liquids. A one-dimensional reaction-diffusion model with hundreds of reaction processes can reveal how various plasma species permeate into the liquid and what reactions are triggered. In particular, the interaction between plasma-induced reactive oxygen / nitrogen species and solutions containing various components (depending on the application) is extremely complicated and is a subject to be challenged. [1] T. Murakami and O. Sakai, Plasma Sources Sci. Technol. 29, 115018 (2020). [2] O. Sakai, S. Kawaguchi and T. Murakami, Jpn. J. Appl. Phys. 61 (2022) (in Press). |
Monday, October 3, 2022 3:00PM - 3:30PM |
GM2.00003: Lunch
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Monday, October 3, 2022 3:30PM - 4:15PM |
GM2.00004: Novel Hydrogen Generation Study Applying Rebound Tailing Pulse and Wet Electrode Methods Invited Speaker: Naohiro Shimizu A set of novel pulsed power methods was applied to high resistance water dissociation for the future hydrogen energy generation. The Rebound Tailing Pulse (RTP) method has the two-step liquid dissociation abilities as follows. At the 1st step, the forward pulse with high voltage rising up ratio (dV/dt) and high electric field shock dissociates the liquid and generates ions and radicals in the vicinity of electrodes. At the 2nd step, the continuous reverse pulse resynthesizes the dissociated species in the vicinity of the electrode instantly. The Wet Electrode (WE) method consists of the following two-step processes in the liquid dissociation. The 1st step process is “pulsed power activation of high particle density liquid state at the porous electrode creepage”. The 2nd step process is “subsequent non-thermal equilibrium plasma reactions of these particles diffusing into the low particle density gas state”. In order to know the faculty of these methods, the deionized water (DIW) dissociation experiments were performed. The RTP method with the forward voltage of 10 kV level and 5 kpps pulse conditions and the WE method were applied. The reactor with a porous-ceramic anode electrode, wetted with water, and a dry fine-ceramic cathode electrode in the atmospheric air was applied. The H2 generation efficiency, close to the theoretical prediction, was confirmed when “Tanzanite” colored plasma was detected in the reactor. These features may be due to the “RTP” reformation of the high-water particle density liquid state in the wetted porous-electrode creepage and their continuous diffusion into the gas plasma space with the help of “Fick’s law of diffusion” and “pulsed ion wind”. |
Monday, October 3, 2022 4:15PM - 5:00PM |
GM2.00005: Modeling of plasma-liquid interactions Invited Speaker: Annemie Bogaerts Plasma-liquid interactions are important for various applications, and therefore, a good understanding of the plasma-liquid interaction mechanisms is indispensable. This can be obtained by computer modeling. Different modeling approaches can be used, which all have their own advantages and drawbacks. For instance, a 0D chemical kinetics model cannot describe spatial behavior, but because of its limited calculation time, it can include a rich plasma chemistry. Vice versa, more-dimensional fluid dynamics models can account for gas and liquid flow behavior, but are more time-consuming, and therefore typically consider only a limited chemistry. |
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