Pub Date : 2023-10-20DOI: 10.1007/s11090-023-10404-0
Duc Ba Nguyen, Shirjana Saud, Quang Thang Trinh, Hongjie An, Nam-Trung Nguyen, Quang Hung Trinh, Hoang Tung Do, Young Sun Mok, Won Gyu Lee
A multiple-capillary Ar plasma jet was successfully generated by an advanced dielectric barrier discharge reactor. The reactor consisted of four quartz capillaries arranged separately and covered by two ring-shaped electrodes, which were isolated by a liquid dielectric. The advantages of the reactor included less Ar consumption (ranging from 1 to 3 L/min to obtain a total cross-sectional area of four individual plasma flow components of 3.14 mm2 at the capillary orifices) and low gas temperatures (not exceeding 40 °C). The obtained temperature is suitable for implementing various biomedical applications such as wound healing, dental treatment, and cancer therapy. Furthermore, the plasma jet spread when it interreacted with dielectric materials or skin, resulting in an enlarged effective plasma treatment area of approximately 8 mm2. Analysis of optical emission spectra of the plasma jet indicated the existence of several reactive species, suggesting that the plasma device holds potential for biomedical applications and material surface treatments.
{"title":"Generation of Multiple Jet Capillaries in Advanced Dielectric Barrier Discharge for Large-Scale Plasma Jets","authors":"Duc Ba Nguyen, Shirjana Saud, Quang Thang Trinh, Hongjie An, Nam-Trung Nguyen, Quang Hung Trinh, Hoang Tung Do, Young Sun Mok, Won Gyu Lee","doi":"10.1007/s11090-023-10404-0","DOIUrl":"10.1007/s11090-023-10404-0","url":null,"abstract":"<div><p>A multiple-capillary Ar plasma jet was successfully generated by an advanced dielectric barrier discharge reactor. The reactor consisted of four quartz capillaries arranged separately and covered by two ring-shaped electrodes, which were isolated by a liquid dielectric. The advantages of the reactor included less Ar consumption (ranging from 1 to 3 L/min to obtain a total cross-sectional area of four individual plasma flow components of 3.14 mm<sup>2</sup> at the capillary orifices) and low gas temperatures (not exceeding 40 °C). The obtained temperature is suitable for implementing various biomedical applications such as wound healing, dental treatment, and cancer therapy. Furthermore, the plasma jet spread when it interreacted with dielectric materials or skin, resulting in an enlarged effective plasma treatment area of approximately 8 mm<sup>2</sup>. Analysis of optical emission spectra of the plasma jet indicated the existence of several reactive species, suggesting that the plasma device holds potential for biomedical applications and material surface treatments.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135513765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-19DOI: 10.1007/s11090-023-10405-z
Soad Mohsenimehr, Achim von Keudell
Dielectric barrier discharges (DBD) are often used for gas conversion, such as carbon dioxide splitting, volatile organic compound removal or ozone generation. Due to the tiny plasma filaments in DBD discharges, efficient mixing of the gas flow with the plasma is essential. This is studied by using a surface dielectric barrier discharge (sDBD) with an electrode design similar to plasma actuators to optimize plasma-flow interaction. The flow pattern has been measured by Schlieren diagnostics and compared to a fluid dynamic simulation. Gas conversion efficiency has been tested by monitoring the conversion of 0.7% CO(_2) admixed to an N(_2) gas stream via infrared spectroscopy in the exhaust. The actuator design of the electrodes induces a significant plasma force on the fluid, which results in the formation of vortices above the electrodes, as reproduced in the simulation. It is shown that the height of the vortices created in the velocity field can characterize the mixing process, which dominates the conversion efficiency of carbon dioxide at different gas flow rates.
介质阻挡放电(DBD)通常用于气体转化,如二氧化碳分解、挥发性有机化合物去除或臭氧生成。由于DBD放电中的等离子体细丝很小,因此气体流与等离子体的有效混合至关重要。本文采用表面介质阻挡放电(sDBD)和类似等离子体致动器的电极设计来优化等离子体流相互作用。流型已被纹影诊断测量,并与流体动力学模拟进行了比较。通过监测0.7的转化率,测试了气体的转化效率% CO(_2) admixed to an N(_2) gas stream via infrared spectroscopy in the exhaust. The actuator design of the electrodes induces a significant plasma force on the fluid, which results in the formation of vortices above the electrodes, as reproduced in the simulation. It is shown that the height of the vortices created in the velocity field can characterize the mixing process, which dominates the conversion efficiency of carbon dioxide at different gas flow rates.
{"title":"Surface Dielectric Barrier Discharge (sDBD) for Flow Control in Plasma Conversion","authors":"Soad Mohsenimehr, Achim von Keudell","doi":"10.1007/s11090-023-10405-z","DOIUrl":"10.1007/s11090-023-10405-z","url":null,"abstract":"<div><p>Dielectric barrier discharges (DBD) are often used for gas conversion, such as carbon dioxide splitting, volatile organic compound removal or ozone generation. Due to the tiny plasma filaments in DBD discharges, efficient mixing of the gas flow with the plasma is essential. This is studied by using a surface dielectric barrier discharge (sDBD) with an electrode design similar to plasma actuators to optimize plasma-flow interaction. The flow pattern has been measured by Schlieren diagnostics and compared to a fluid dynamic simulation. Gas conversion efficiency has been tested by monitoring the conversion of 0.7% CO<span>(_2)</span> admixed to an N<span>(_2)</span> gas stream via infrared spectroscopy in the exhaust. The actuator design of the electrodes induces a significant plasma force on the fluid, which results in the formation of vortices above the electrodes, as reproduced in the simulation. It is shown that the height of the vortices created in the velocity field can characterize the mixing process, which dominates the conversion efficiency of carbon dioxide at different gas flow rates.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-023-10405-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135778910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-14DOI: 10.1007/s11090-023-10394-z
Palma Rosa Rotondo, Domenico Aceto, Caterina Rotolo, Marianna Ambrico, Giorgio Dilecce, Francesco Faretra, Rita Milvia De Miccolis Angelini, Paolo Francesco Ambrico
The application of Low-Temperature Plasmas has shown great potential as an effective and alternative tool for microbial inactivation in recent years. Nevertheless, further investigations are required to fully understand the possible factors influencing these processes. The present study aims to investigate the effectiveness of square wave modulated Volume Dielectric Barrier Discharge on the direct inhibition of conidial germination in five different fungal species, various discharge conditions, and medium composition. The five different fungal species used were Botrytis cinerea, Monilinia fructicola, Aspergillus carbonarius, Fusarium graminearum, and Alternaria alternata. On water agar, the inhibition of Botrytis cinerea was influenced by the applied voltage, which mainly reflects the uniformity of the treatment. Under the selected voltage condition, the inhibition increased with treatment duration and decreased with fungal spore complexity. B. cinerea and M. fructicola, with unicellular conidia and low melanin content, showed similar behaviour and high sensitivity to the treatment. F. graminearum and A. alternata, both having multicellular conidia, were more resistant to the plasma treatment and showed different sensitivity likely due to different content in melanin. However, after 1 min of treatment, complete inhibition of conidial germination was achieved for all the tested species. Inhibition of A. carbonarius conidia on different agarized media containing dextrose or malt extract was influenced by the complexity and composition of the medium, being potato dextrose agar that more hindered the plasma efficacy. Each medium exhibited a different electrical response studied by Electrical Impedance Spectroscopy and morphology observed by Scanning Electron Microscopy images. These differences translated into a different response to the applied electrical field, influencing plasma generation and uniformity.
{"title":"Exploring Factors Influencing the Inhibitory Effect of Volume Dielectric Barrier Discharge on Phytopathogenic Fungi","authors":"Palma Rosa Rotondo, Domenico Aceto, Caterina Rotolo, Marianna Ambrico, Giorgio Dilecce, Francesco Faretra, Rita Milvia De Miccolis Angelini, Paolo Francesco Ambrico","doi":"10.1007/s11090-023-10394-z","DOIUrl":"10.1007/s11090-023-10394-z","url":null,"abstract":"<div><p>The application of Low-Temperature Plasmas has shown great potential as an effective and alternative tool for microbial inactivation in recent years. Nevertheless, further investigations are required to fully understand the possible factors influencing these processes. The present study aims to investigate the effectiveness of square wave modulated Volume Dielectric Barrier Discharge on the direct inhibition of conidial germination in five different fungal species, various discharge conditions, and medium composition. The five different fungal species used were <i>Botrytis cinerea, Monilinia fructicola, Aspergillus carbonarius, Fusarium graminearum</i>, and <i>Alternaria alternata</i>. On water agar, the inhibition of <i>Botrytis cinerea</i> was influenced by the applied voltage, which mainly reflects the uniformity of the treatment. Under the selected voltage condition, the inhibition increased with treatment duration and decreased with fungal spore complexity. <i>B. cinerea</i> and <i>M. fructicola</i>, with unicellular conidia and low melanin content, showed similar behaviour and high sensitivity to the treatment. <i>F. graminearum</i> and <i>A. alternata</i>, both having multicellular conidia, were more resistant to the plasma treatment and showed different sensitivity likely due to different content in melanin. However, after 1 min of treatment, complete inhibition of conidial germination was achieved for all the tested species. Inhibition of <i>A. carbonarius</i> conidia on different agarized media containing dextrose or malt extract was influenced by the complexity and composition of the medium, being potato dextrose agar that more hindered the plasma efficacy. Each medium exhibited a different electrical response studied by Electrical Impedance Spectroscopy and morphology observed by Scanning Electron Microscopy images. These differences translated into a different response to the applied electrical field, influencing plasma generation and uniformity.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-023-10394-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135804386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-14DOI: 10.1007/s11090-023-10413-z
Ahmad Hamdan
{"title":"Exploring the Discharge Phenomenon at the Interface of Immiscible Liquids: Current Understanding and Potential Applications in Nanomaterial Synthesis","authors":"Ahmad Hamdan","doi":"10.1007/s11090-023-10413-z","DOIUrl":"https://doi.org/10.1007/s11090-023-10413-z","url":null,"abstract":"","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135804385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-14DOI: 10.1007/s11090-023-10401-3
Yingwen Li, Fei Gao, Yang Li, Chenyang Shen, Chang-jun Liu
There exist always some H2S in natural gas. The industrialized process for H2S removal is an energy intense process and must be applied in a large scale. An alternative process is needed. Herein, we report a removal of H2S from a model natural gas mixture with methane, ethane and propane by dielectric barrier discharge (DBD), with which the dielectric (quartz) is frosted and coated with a layer of zeolite imidazole framework-67 (ZIF-67) nanoparticles. Compared to the DBD without coating, the average electric field as well as the mean electron energy of the DBD with ZIF-67 coating are higher at the same specific energy input (SEI), leading to a high H2S conversion of 75.4% with the limited conversion of methane (less than 2%). No conversions of other low alkanes can be detected. This provides a potential way for the H2S removal from the natural gas sources in the remote or isolated region.