Complex plasma, consisting of ionized gas mixed with micron-sized dust particles, exhibit unique behaviors due to the mass disparity between dust grains and other plasma components. These disparities result in non-Hamiltonian dynamics that pose significant challenges for numerical modeling. Under specific conditions, the dust grains self-organize into crystal structures, driven by ion wakefields and subject to imperfections that induce dynamic phenomena like torsions—where dust grains couple and exhibit elliptical motion within the crystal lattice.
To better understand these phenomena, we developed a near real-time interactive computer model grounded in laboratory conditions, specifically replicating the environment within a GEC RF reference cell. This model addresses the challenges of stiffness in differential equations by employing an innovative point charge approach, where each point charge is dynamically influenced by all dust grains, enhancing the model's accuracy and responsiveness. The system allows for user interaction, enabling the manipulation of parameters and near real-time observation of dust behavior. Our approach balances computational efficiency with the ability to simulate complex plasma dynamics, providing a powerful tool for the study of dusty plasma crystals.
{"title":"N-body simulation of spinning particle pairs in a complex plasma crystal","authors":"Zachary Watson , Parker Adamson , Jorge Martinez-Ortiz , Katrina Vermillion , Calvin Carmichael , Samuel Garcia-Rodriguez , Lorin Matthews , Truell Hyde , Bryant Wyatt","doi":"10.1016/j.fpp.2024.100082","DOIUrl":"10.1016/j.fpp.2024.100082","url":null,"abstract":"<div><div>Complex plasma, consisting of ionized gas mixed with micron-sized dust particles, exhibit unique behaviors due to the mass disparity between dust grains and other plasma components. These disparities result in non-Hamiltonian dynamics that pose significant challenges for numerical modeling. Under specific conditions, the dust grains self-organize into crystal structures, driven by ion wakefields and subject to imperfections that induce dynamic phenomena like torsions—where dust grains couple and exhibit elliptical motion within the crystal lattice.</div><div>To better understand these phenomena, we developed a near real-time interactive computer model grounded in laboratory conditions, specifically replicating the environment within a GEC RF reference cell. This model addresses the challenges of stiffness in differential equations by employing an innovative point charge approach, where each point charge is dynamically influenced by all dust grains, enhancing the model's accuracy and responsiveness. The system allows for user interaction, enabling the manipulation of parameters and near real-time observation of dust behavior. Our approach balances computational efficiency with the ability to simulate complex plasma dynamics, providing a powerful tool for the study of dusty plasma crystals.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"13 ","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-03DOI: 10.1016/j.fpp.2024.100078
Sarthak Das , Sarita Mohapatra , Satyananda Kar
Cold atmospheric pressure plasma jet activated liquids (CAPJALs) have attracted considerable scientific attention due to their peculiar antimicrobial characteristics. In the current context, there is a need to compare the bactericidal activity of CAPJALs and demonstrate the specific parameters necessary to obtain greater effectiveness. This in-vitro research examines the antimicrobial activity of liquids, such as deionized water (DI-W), drinking water (DW), tap water (TW), and normal saline (NS) activated by Ar cold atmospheric pressure plasma jet (CAPJ) against multidrug-resistant (MDR) E. coli and S. aureus. The computed D- value showed that CAPJALs' bacterial inactivation efficacy followed the trend – DI-W ≈ NS > DW > TW for both the isolates. To obtain greater bactericidal effectiveness, an optimum combination of liquid activation time by CAPJ and CAPJAL – bacteria interaction time was noticed. In addition, the rate at which the physicochemical parameters (pH, electrical conductivity (EC), total dissolved solids (TDS), and concentration of reactive species (H2O2, NO3-, and NO2-)) changed within the liquid varied in different ways. It was observed that the identified gas-phase species (Ar I, Ar+, N2, N2+, O I, OH•, OH+, NO+, O2+, N2O3-, NO3-, N2O2-, etc.) would contribute to modification of liquid physicochemical property by generating liquid phase reactive species (NO3-, NO2-, H+, H2O2, ONOOH, Cl2, HOCl, etc.) via reaction cascades. These reactive species in the liquid phase, together with other physicochemical characteristics, were found to play a part in the process of bacterial inactivation. This study into the underlying mechanism of CAPJ – liquid and CAPJAL – bacteria interaction would help to determine its potential use as a disinfectant in healthcare settings.
List of microorganisms
E. coli: Escherichia coli; S. aureus: Staphylococcus aureus.
{"title":"Physicochemical properties and antimicrobial efficacy of argon cold atmospheric pressure plasma jet activated liquids – a comparative study","authors":"Sarthak Das , Sarita Mohapatra , Satyananda Kar","doi":"10.1016/j.fpp.2024.100078","DOIUrl":"10.1016/j.fpp.2024.100078","url":null,"abstract":"<div><div>Cold atmospheric pressure plasma jet activated liquids (CAPJALs) have attracted considerable scientific attention due to their peculiar antimicrobial characteristics. In the current context, there is a need to compare the bactericidal activity of CAPJALs and demonstrate the specific parameters necessary to obtain greater effectiveness. This in-vitro research examines the antimicrobial activity of liquids, such as deionized water (DI-W), drinking water (DW), tap water (TW), and normal saline (NS) activated by Ar cold atmospheric pressure plasma jet (CAPJ) against multidrug-resistant (MDR) <em>E. coli</em> and <em>S. aureus</em>. The computed <em>D-</em> value showed that CAPJALs' bacterial inactivation efficacy followed the trend – DI-W ≈ NS > DW > TW for both the isolates. To obtain greater bactericidal effectiveness, an optimum combination of liquid activation time by CAPJ and CAPJAL – bacteria interaction time was noticed. In addition, the rate at which the physicochemical parameters (pH, electrical conductivity (EC), total dissolved solids (TDS), and concentration of reactive species (H<sub>2</sub>O<sub>2</sub>, NO<sub>3</sub><sup>-</sup>, and NO<sub>2</sub><sup>-</sup>)) changed within the liquid varied in different ways. It was observed that the identified gas-phase species (Ar I, Ar<sup>+</sup>, N<sub>2</sub>, N<sub>2</sub><sup>+</sup>, O I, OH•, OH<sup>+</sup>, NO<sup>+</sup>, O<sub>2</sub><sup>+</sup>, N<sub>2</sub>O<sub>3</sub><sup>-</sup>, NO<sub>3</sub><sup>-</sup>, N<sub>2</sub>O<sub>2</sub><sup>-</sup>, etc.) would contribute to modification of liquid physicochemical property by generating liquid phase reactive species (NO<sub>3</sub><sup>-</sup>, NO<sub>2</sub><sup>-</sup>, H<sup>+</sup>, H<sub>2</sub>O<sub>2</sub>, ONOOH, Cl<sub>2</sub>, HOCl, etc.) via reaction cascades. These reactive species in the liquid phase, together with other physicochemical characteristics, were found to play a part in the process of bacterial inactivation. This study into the underlying mechanism of CAPJ – liquid and CAPJAL – bacteria interaction would help to determine its potential use as a disinfectant in healthcare settings.</div></div><div><h3>List of microorganisms</h3><div><em>E. coli: Escherichia coli; S. aureus: Staphylococcus aureus</em>.</div></div>","PeriodicalId":100558,"journal":{"name":"Fundamental Plasma Physics","volume":"12 ","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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