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 IR5: Plasma Liquid Interaction IV |
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Chair: Toshiro Kaneko, Tohoku University Room: Sendai International Center Sakura 2 |
Thursday, October 6, 2022 4:00PM - 4:30PM |
IR5.00001: Production of nanomaterials by pulsed electrical discharges in dielectric liquid Invited Speaker: Ahmad Hamdan The field of nanotechnology has rapidly expanded over the past few decades due to the unique physical, chemical, mechanical, and electrical properties of nanoscale materials. Today, nanomaterials are applied in numerous fields, including catalysis, drug delivery, and microelectronics, among others. Plasma-based methods have shown great potential for use in the synthesis of nanomaterials via bottom-up or top-down approaches. The plasma-liquid system is a relatively novel field of research that has shown high efficiency in synthesizing nanomaterials. In this system, the plasma is either i) generated in a gas phase that is in contact with the liquid or ii) generated directly in the liquid (with or without bubble assistance). |
Thursday, October 6, 2022 4:30PM - 4:45PM |
IR5.00002: Plasma Discharge Inside Liquid: A Novel Single-step Green Approach to Fabricate Metal/Metal Oxide Nanocomposites Palash J Boruah, Rakesh R Khanikar, Parismita Kalita, Heremba Bailung This report focuses on a novel method to synthesize metal/metal oxide nanocomposites (NC) by generating plasma between two vertically pointed electrodes inside liquid. The method combines two well-known approaches of nanofabrication, such as evaporation of electrode material and reduction of metallic salt, to fabricate NCs in a single step. As both the electrode and metallic salt solution serve as the source of nanoparticles (NP), therefore it provides flexibility in controlling both the physical (plasma, electrode material) and chemical (solution) parameters, which facilitates fine-tuning required for desired shape and composition of NPs. Moreover, it is an environmentally friendly approach as it does not require any toxic stabilizing and reducing agents, which is a major concern in chemical nanofabrication methods. Based on the potential applications of Au/CuO NC, we have synthesized the same by generating plasma between two copper electrodes inside HAuCl4 solution. The energetic electrons and reactive species present in the plasma zone enable the simultaneous synthesis of CuO nanospindles and spherical Au NPs. Interestingly, the Au NPs bind the CuO nanospindles forming flower-like structures. The process can be utilized to fabricate a wide range of desired NCs. |
Thursday, October 6, 2022 4:45PM - 5:00PM |
IR5.00003: Carbon-doped TiO2 via Solution Plasma Chayanaphat Chokradjaroen, Jiangqi Niu, Satita Thiangtham, Gasidit Panomsuwan, Nagahiro Saito Carbon-doped TiO2 is one of the photocatalysts showing the potential to improve photocatalytic activity and initiate visible light activity. An electrical discharge in liquid phase, so-called solution plasma (SP), was successfully applied to synthesize carbon-doped TiO2. The formation of carbon-doped TiO2 was simply conducted by the discharge under a mixture of tetrabutyl orthotitanate and alcohols, as sources of TiO2 and carbon, respectively, without the addition of a reducing agent. The different synthesis conditions, e.g., different electrode configurations (e.g., pin-to-pin, pin-to-coil, and crisscross), and discharge time (i.e., 5, 10, and 30 min), were investigated. The obtained carbon-doped TiO2 was found to have a carbon content of more than 10% and a particle size ranging from 10 nm to 2 μm, depending on the synthesis conditions. The different electrode configurations were found to lead to different plasma modes. They provided the different amounts of energy to proceed the reaction in the plasma field, which exhibited the relationship to dopant concentration in TiO2 as well as their photocatalytic activity and visible light activity. Consequently, it could imply that SP allows for the simple and tunable synthesis of carbon-doped photocatalysts for the photodegradation of a wide range of environmental pollutants. |
Thursday, October 6, 2022 5:00PM - 5:30PM |
IR5.00004: Continuous liquid treatment by high-density microwave plasma in flowing liquid Invited Speaker: Haruka Suzuki In recent years, much attention has been paid to the generation of plasma in liquids and the interaction between plasma and liquids. Application of such plasma in liquids to organic decomposition and sterilization, and the chemical reaction species in the plasma are being actively studied. We have developed microwave-excited plasma sources using slot antenna, which minimizes damage to the slot electrodes, increases the plasma volume, and have improved the stability of plasma production. We also reported improvement of liquid treatment efficiency under reduced pressure conditions during discharge using a pump [1]. However, since these processes were performed in batch processing, the liquid processing speed of these plasma sources were not sufficient for practical use, and drastic improvement of the liquid processing speed was an issue. To solve this, we have developed an in-line microwave plasma system utilizing the Venturi effect, and an improvement in the efficiency of decomposition treatment of organic solutions compared to the batch processing [2]. |
Thursday, October 6, 2022 5:30PM - 6:00PM |
IR5.00005: Plasma / liquid (P/L) interfacial reaction for gas reduction reaction Invited Speaker: Tetsuya Haruyama The gas reduction reaction is a reaction that has become particularly important in recent years, such as ammonia synthesis and carbon dioxide reduction resource conversion. Although various reaction systems have been studied and proposed, we have found and studied the Plasma/Liquid (P/L) reaction as a gas reduction reaction that proceeds at the gas-liquid interface. The P/L reaction is carried out by spraying an activated gas onto the surface of the water phase and proceeding with the reaction of abstracting hydrogen atoms exposed on the surface of the water phase (hydrogen abstraction reaction). This reaction can proceed at room temperature, normal pressure, and without any catalyst. It is a reaction in which gas molecules (atoms) abstract hydrogen from water molecules, so in other words, it is a gas reduction reaction. |
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