电工技术学报  2023, Vol. 38 Issue (11): 2977-2988    DOI: 10.19595/j.cnki.1000-6753.tces.220212
高电压与放电 |
大气压He/O2等离子体活性粒子在水溶液中传质的氧含量效应
丁蕴函1, 王晓龙1, 谭震宇1, 刘亚迪2
1.山东大学电气工程学院 济南 250061;
2.中国科学院电工研究所 北京 100190
Oxygen Concentration Effect on the Mass Transfer of Reactive Species of the Atmospheric-Pressure He/O2 Plasma in Aqueous Solution
Ding Yunhan1, Wang Xiaolong1, Tan Zhenyu1, Liu Yadi2
1. School of Electrical Engineering Shandong University Jinan 250061 China;
2. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China
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摘要 大气压低温等离子体作用于生物组织要穿过其表面几十到几百微米厚的水溶液,将会涉及等离子体中活性粒子在水溶液中的传质,而活性粒子的生成与放电气体的氧含量密切相关。该文基于一维流体模型,研究了在放电气体中不同的氧含量下(体积分数为0.1%~5%)大气压He/O2等离子体中五种主要活性粒子H2O2、O2-、HO2、O3及OH在水溶液中的渗透深度分布,并阐释了相关机理。研究表明,氧含量对活性粒子的生成与消耗反应产生较大影响,进而影响到活性粒子在水溶液中的渗透深度。随着氧含量的增加,H2O2、O2-和HO2的渗透深度减小,但仍维持在数百微米以上的可观量值,而O3和OH的渗透深度增加,并可达20 μm以上,这一深度使得两种粒子可以直接作用到某些生物组织,因而对于等离子体的生物医学应用具有重要意义。
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丁蕴函
王晓龙
谭震宇
刘亚迪
关键词 等离子体粒子传质氦氧气体氧含量效应一维流体模型等离子体生物医学    
Abstract:Cold-temperature atmospheric plasma (CAP) has been successfully applied in biological engineering, such as sterilization, surgery and even cancer treatment. However, the biological tissue to be treated is usually covered with a layer of aqueous solution with a thickness of tens to hundreds of microns. Plasma action on the surface of biological tissues necessarily involves the mass transfer process of the active species generated by the plasma in aqueous solution. There are lots of experimental measurement techniques have been used to analyze the mass transfer process between plasma and water. However, due to the limited detection technology, it is difficult to obtain the concentration distribution of species in aqueous solution. Thus, we used numerical simulations to quantify the mass transfer of active species in aqueous solutions.
Based on the one-dimensional diffusion-reaction model, the mass transfer process of active species produced in plasma from the gas phase region to the gas-liquid interface region and finally into the liquid phase region is investigated in this work by establishing the control equations and boundary conditions of liquid phase region. The generation of active species in the plasma is closely related to the oxygen volume in the discharge gas,so we analyzed the generation and consumption reactions of active species in aqueous solution by simulating 19 reactive oxygen species (ROS) and 84 main chemical reactions in the liquid phase region with the change of the oxygen volume fraction in the discharge gas (the range is 0.1%~5%), in order to study the penetration depth distribution of the five main ROSs (H2O2, O2-, HO2, O3, and OH) in liquid phase region under different conditions. According to the simulation, the change of oxygen volume in the discharge gas has an impact on the flux of active species generated by the plasma into the liquid phase region, which also affects the generation and consumption of the five main ROS in the aqueous solution. For H2O2, O2-, and HO2, all the generation, consumption, and net generation decrease with the increase of oxygen content, while for the OH and O3, all the generation, consumption, and net generation increase with increase of oxygen content. These processes finally results in the change of the species number density and penetration depth of the ROS.
The following conclusions can be drawn from the simulation analysis: (1)The change of the oxygen content volume in the discharge gas affects the flux of related oxygen species and electrons into the liquid surface, and then affects the species number density concentration and penetration of the five ROSs in the aqueous solution depth. (2)The penetration depth of OH and O3 increases with the increase of oxygen volume, from a few μm to more than 20 μm within the range of oxygen volume considered, this depth makes it possible for these two species to act directly on some biological tissue. (3)The species number density of H2O2, O2-, and HO2 in aqueous solution decreases with the increase of oxygen volume, so their penetration depth also decreases, but they still remains above a considerable value of hundreds of microns. Therefore, the reduction of the penetration depth of the three particles has little effect on their biomedical applications.
Key wordsPlasma species mass transfer    helium/oxygen mixture    oxygen concentration effect    one-dimensional fluid model    plasma biomedicine   
收稿日期: 2022-02-14     
PACS: TM8  
基金资助:国家自然科学基金(52077128)和山东省自然科学基金(ZR2020ME208)资助项目
通讯作者: 王晓龙 男,1979年生,副教授,硕士生导师,研究方向为气体放电等离子体。E-mail:wangxiaolong@sdu.edu.cn   
作者简介: 丁蕴函 男,1999年生,硕士研究生,研究方向为气体放电等离子体。E-mail:qingdaodyh@126.com
引用本文:   
丁蕴函, 王晓龙, 谭震宇, 刘亚迪. 大气压He/O2等离子体活性粒子在水溶液中传质的氧含量效应[J]. 电工技术学报, 2023, 38(11): 2977-2988. Ding Yunhan, Wang Xiaolong, Tan Zhenyu, Liu Yadi. Oxygen Concentration Effect on the Mass Transfer of Reactive Species of the Atmospheric-Pressure He/O2 Plasma in Aqueous Solution. Transactions of China Electrotechnical Society, 2023, 38(11): 2977-2988.
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