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Discharge Regime Transition and Salinity-Tolerant PFOA Defluorination by Nanosecond Pulsed Gas-Liquid Interface Plasma 纳秒脉冲气液界面等离子体对PFOA除氟的放电状态转换及耐盐性研究
IF 3.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-17 DOI: 10.1007/s11090-026-10686-0
Atsushi Komuro, Yoshiyuki Teramoto, Hyun-ha Kim, Taizo Sano
{"title":"Discharge Regime Transition and Salinity-Tolerant PFOA Defluorination by Nanosecond Pulsed Gas-Liquid Interface Plasma","authors":"Atsushi Komuro,&nbsp;Yoshiyuki Teramoto,&nbsp;Hyun-ha Kim,&nbsp;Taizo Sano","doi":"10.1007/s11090-026-10686-0","DOIUrl":"10.1007/s11090-026-10686-0","url":null,"abstract":"<div><p>The degradation of perfluorooctanoic acid (PFOA) in high-salinity wastewater remains a critical challenge, as conventional advanced oxidation processes suffer from severe scavenging of reactive species by coexisting ions. This study investigates how carrier gas composition and solution conductivity affect PFOA defluorination (50 mg/L) in a nanosecond pulsed gas-liquid interface plasma reactor. By systematically evaluating the effects of carrier gases (N<sub>2</sub> and O<sub>2</sub>) and solution conductivities (0.01 to 22.6 mS/cm using NaCl and Na<sub>2</sub>SO<sub>4</sub>), we describe an observed shift in the dominant macroscopic controlling variable for PFOA defluorination as solution conductivity increases. At low conductivity (~ 0.01 mS/cm), the defluorination rate is sensitive to the carrier gas composition: an N<sub>2</sub> atmosphere produced roughly twice the fluoride yield of an O<sub>2</sub> atmosphere at 240 s, consistent with a reductive contribution that may involve hydrated electrons. At high conductivity (6.2–22.6 mS/cm, NaCl or Na<sub>2</sub>SO<sub>4</sub>), the reduced liquid impedance raised the injected energy per pulse by a factor of 1.6–1.9, and the N<sub>2</sub>/O<sub>2</sub> difference largely disappeared. Defluorination data from all four gas/salt combinations converged onto a single energy-dose curve, indicating that within the parameter range studied, cumulative energy input becomes a sufficient macroscopic descriptor of the observed defluorination rate. The underlying C–F bond cleavage remains electron-driven throughout, and the effects of ionic strength, interfacial PFOA enrichment, dissolved O<sub>2</sub> reduction, and discharge morphology cannot be independently separated in the present experimental design. These results suggest that nanosecond pulsed plasma can maintain defluorination performance in high-salinity matrices where conventional AOPs are strongly inhibited by radical scavenging.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 5","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-026-10686-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281357","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}
引用次数: 0
Systematic Understanding of Temperature Fields and Electrode Phenomena in Multiphase AC Ar–N₂ Arcs 多相交流ar - n2电弧温度场和电极现象的系统认识
IF 3.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-17 DOI: 10.1007/s11090-026-10660-w
Manabu Tanaka, Takayuki Watanabe
{"title":"Systematic Understanding of Temperature Fields and Electrode Phenomena in Multiphase AC Ar–N₂ Arcs","authors":"Manabu Tanaka,&nbsp;Takayuki Watanabe","doi":"10.1007/s11090-026-10660-w","DOIUrl":"10.1007/s11090-026-10660-w","url":null,"abstract":"<div><p>Systematic understanding of multiphase AC arcs in Ar–N₂ atmospheres is presented for the first time, linking spatiotemporal temperature fluctuations with electrode phenomena. Quantitative evidence is provided for arc constriction, enhanced swing behavior, and nitrogen-radical-induced electrode erosion. Thermal pinch effects caused by nitrogen dissociation and thermal conductivity led to reduced arc area and an increase of localized regions above 13,000 K. High-speed synchronized diagnostics combining line and continuum emissions enabled measurement of two-dimensional temperature distributions under non-axisymmetric conditions. Electrode studies revealed accelerated erosion of oxide-doped tungsten electrodes in nitrogen-rich atmospheres. Gibbs free energy analysis demonstrated that reduction of electrode oxides by N radicals raised effective work function, enhancing heating and tungsten evaporation. These findings propose a comprehensive framework that couples arc dynamics with electrode chemistry in multiphase AC arcs. The results provide new insights into arc–electrode interactions and support advanced applications of multiphase AC arcs as thermal and reactive sources.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 5","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281402","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}
引用次数: 0
From Arc to Filamentary Plasma: Airflow-Controlled Regime Transition in Atmospheric Pressure DC Gliding Arc Discharge 从电弧到丝状等离子体:常压直流滑动电弧放电中气流控制的状态转变
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-13 DOI: 10.1007/s11090-026-10685-1
Ferhat Bozduman
{"title":"From Arc to Filamentary Plasma: Airflow-Controlled Regime Transition in Atmospheric Pressure DC Gliding Arc Discharge","authors":"Ferhat Bozduman","doi":"10.1007/s11090-026-10685-1","DOIUrl":"10.1007/s11090-026-10685-1","url":null,"abstract":"<div><p>Gliding arc discharge (GAD) plasmas operated in atmospheric air exhibit complex transitions between thermal arc and non-thermal filamentary modes, which significantly affect their physicochemical properties. In this study, the effect of airflow on the plasma regime transition in atmospheric direct current (DC) gliding arc discharge was experimentally investigated. The plasma was generated using copper wire electrodes with a fixed 6 mm spacing, and the airflow rate was controlled by varying the voltage of a DC snail fan. Electrical properties were analyzed using a high-voltage probe, current measurements, and oscilloscope diagnostics, while plasma emission was studied using optical emission spectroscopy. The results reveal a clear transition from a stable arc regime at low airflow to a non-thermal filamentary regime at higher airflow rates. The optical emission spectra are dominated by a nitrogen-second positive system with strong emission at 337 nm and weaker first negative system bands around 391 nm. The electron temperature was determined using the intensity ratios of these emissions. The vibrational temperature was determined using a Boltzmann plot method based on N₂ emission bands at 337, 357, and 380 nm. Additionally, the reduced electric field (E/N) decreased with increasing airflow due to simultaneous decreases in discharge voltage and gas temperature variations. A plasma regime map relating airflow velocity and discharge voltage was constructed, revealing three distinct regions: arc, transition, and filamentous regimes. These findings demonstrate that airflow plays a crucial role in controlling the electrical properties, excitation dynamics, and discharge structure of atmospheric DC GAD plasmas.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-026-10685-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237001","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}
引用次数: 0
H2O2-mediated Redox Priming by Non-thermal Microplasma Enhances Macromolecule Delivery to HL-60 Cells via Endocytosis 非热微等离子体h2o2介导的氧化还原启动通过内吞作用增强大分子向HL-60细胞的传递
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-12 DOI: 10.1007/s11090-026-10682-4
Mahedi Hasan, Jaroslav Kristof, Md. Jahangir Alam, Farhana Begum, Rubaiya Islam, Kazuo Shimizu
{"title":"H2O2-mediated Redox Priming by Non-thermal Microplasma Enhances Macromolecule Delivery to HL-60 Cells via Endocytosis","authors":"Mahedi Hasan,&nbsp;Jaroslav Kristof,&nbsp;Md. Jahangir Alam,&nbsp;Farhana Begum,&nbsp;Rubaiya Islam,&nbsp;Kazuo Shimizu","doi":"10.1007/s11090-026-10682-4","DOIUrl":"10.1007/s11090-026-10682-4","url":null,"abstract":"<div><p>Efficient delivery of therapeutic macromolecules into hematopoietic suspension cells remains a bottleneck for gene- and immune-therapy workflows. Here we frame a contact-free microplasma priming approach as ReMod (Redox-guided Modulation): a reversible, cytocompatible “tune-rather-than-force” strategy that gates uptake through controlled extracellular redox inputs. A 150-kDa fluorescein isothiocyanate–dextran (FD-150) was used as a model cargo in HL-60 leukemia cells. Culture-medium RONS were tuned using N<sub>2</sub> + 0–10% O<sub>2</sub> + H<sub>2</sub>O, Ar + 0–10% O<sub>2</sub> + H<sub>2</sub>O, and Ar + 0–10% N<sub>2</sub> + H<sub>2</sub>O, all at a total flow of 4 Lmin⁻<sup>1</sup>. A brief 3-min non-thermal exposure produced a chemically tunable plasma–liquid interface and revealed a cytocompatible RONS “sweet spot” for FD-150 internalization, maximized under N<sub>2</sub> + 5% O<sub>2</sub> + H<sub>2</sub>O. Scavenger experiments, together with exogenous H<sub>2</sub>O<sub>2</sub>, indicated that extracellular H<sub>2</sub>O<sub>2</sub> is a principal effector of uptake. Time-integrated intracellular ROS showed a modest O<sub>2</sub>-dependent increase, whereas NO-related fluorescence exhibited a larger fold-increase at 1–5% O<sub>2</sub>, suggesting that NO signaling may act as a later, reinforcing component of the redox response. qRT-PCR profiling of endocytic markers was consistent with clathrin-mediated endocytosis and macropinocytosis as dominant uptake routes under ReMod priming. These findings define a practical redox-gating window for macromolecule delivery into suspension leukemia cells without electroporation and provide a basis for extending microplasma ReMod to nucleic-acid or immunotherapeutic payloads.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-026-10682-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148215003","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}
引用次数: 0
Experimental Study on the Formation of Vacuum Anodic Arc by Resistance-Triggered Pulsed Discharge 电阻触发脉冲放电形成真空阳极电弧的实验研究
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-12 DOI: 10.1007/s11090-026-10683-3
Tao Wu, Qian-Hong Zhou, Zhao-Hui Liu, Ao-Wei Liu, Jin-Yue Geng, He-Ji Huang, Xian Meng, Su-Rong Sun, Hai-Xing Wang
{"title":"Experimental Study on the Formation of Vacuum Anodic Arc by Resistance-Triggered Pulsed Discharge","authors":"Tao Wu,&nbsp;Qian-Hong Zhou,&nbsp;Zhao-Hui Liu,&nbsp;Ao-Wei Liu,&nbsp;Jin-Yue Geng,&nbsp;He-Ji Huang,&nbsp;Xian Meng,&nbsp;Su-Rong Sun,&nbsp;Hai-Xing Wang","doi":"10.1007/s11090-026-10683-3","DOIUrl":"10.1007/s11090-026-10683-3","url":null,"abstract":"<div><p>Compared with the cathodic arc of vacuum arcs, the anodic arc typically exhibits higher ion current intensity and can effectively avoid the problem of cathodic arc droplets, thus possessing unique advantages in application fields such as pulsed ion sources and thin film deposition. Based on the resistance-triggering method, through the rational combination of electrode structure (small anode - large cathode) and µs-pulse discharge parameters, a reproducible anodic arc for high-melting-point metals has been achieved. Due to differences in thermal conductivity and other properties among various metal materials, the formation time and intensity of the corresponding anodic arc vary. In the experiment, an intensified high-speed camera was used to capture the anodic arc formation processes of copper, titanium and molybdenum, while transient emission spectroscopy was employed to obtain the evolution laws of atomic and ionic line intensities during anodic arc development. The results indicate that the formation of anodic arc is related to the discharge voltage and duration of the initial high-voltage stage. Increasing the trigger resistance to the trigger anode enhances the anodic arc discharge intensity by shifting the discharge to the main anode. Additionally, increasing the electrode gap also increases the anodic arc discharge intensity. Both effects are accompanied by an increase in the discharge voltage and duration of the high-voltage stage. Langmuir triple probe measurements show that the electron temperature during anodic arc can exceed 3 eV, and the electron density at 1 cm from the jet reaches up to 2.7 × 10<sup>19</sup> m<sup>− 3</sup>. At an arc current of 150 A, the measured ion current intensity of the Cu anodic arc is 16.9 A, with an ion-to-arc current ratio of 11.5%—twice that of the Cu cathodic arc (5.6%), demonstrating that the anodic arc ion possesses higher ion current intensity.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214990","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}
引用次数: 0
Visualization and Analysis of APPJ-induced Liquid Flow in Biological Solution appj诱导生物溶液中液体流动的可视化与分析
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-09 DOI: 10.1007/s11090-026-10681-5
Tongtong He, Xin Li, Yuesheng Zheng
{"title":"Visualization and Analysis of APPJ-induced Liquid Flow in Biological Solution","authors":"Tongtong He,&nbsp;Xin Li,&nbsp;Yuesheng Zheng","doi":"10.1007/s11090-026-10681-5","DOIUrl":"10.1007/s11090-026-10681-5","url":null,"abstract":"<div><p>The influence of atmospheric pressure plasma jet (APPJ) on liquid flow in biological solution was investigated. Gelatin biomolecules were dissolved in deionized (DI) water to simulate a biological solution, and the resulting liquid flow was visualized and quantitatively analyzed during APPJ treatment. For gelatin solutions, the dominant liquid flow regime during APPJ treatment is vertical downward flow. A vortex flow regime emerges only under conditions of low gelatin concentration and high APPJ working gas flow rate; however, this vortex flow contracts and dissipates with prolonged APPJ treatment. In the case of low gelatin concentration solution, the Marangoni effect is a potential contributing factor for the downward flow regime in gelatin solutions, whereas gas shear stress and electrohydrodynamic (EHD) forces induce vortex flow formation. In vortex flow regimes, the Marangoni effect dynamically competes with the combined action of shear stress and EHD forces. Concurrently, cross-linking reactions between APPJ and gelatin increase the dynamic viscosity of the solution, accelerating kinetic energy dissipation. In the case of high gelatin concentration solution, the formation of a surface cross-linked film impedes momentum transfer across the plasma-liquid interface, and the rapid relaxation of interfacial charges resulted that the EHD effect generates a downward force, thereby establishing downward flow as the dominant mechanism.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236971","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}
引用次数: 0
Quantification of Eroded Fe Contamination in Plasma Activated Water Using Acoustic Levitation Assisted Laser-Induced Breakdown Spectroscopy by a Novel Method - Multi-Line Calibration Curve 利用声悬浮辅助激光诱导击穿光谱法定量等离子体活化水中腐蚀铁污染——多线校准曲线
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-04 DOI: 10.1007/s11090-026-10680-6
Jairo C. Peralta, Pankaj Pareek, Ivan A. Urbina, Sanath J. Shetty, Matej Veis, Mario Janda, Pavel Veis
{"title":"Quantification of Eroded Fe Contamination in Plasma Activated Water Using Acoustic Levitation Assisted Laser-Induced Breakdown Spectroscopy by a Novel Method - Multi-Line Calibration Curve","authors":"Jairo C. Peralta,&nbsp;Pankaj Pareek,&nbsp;Ivan A. Urbina,&nbsp;Sanath J. Shetty,&nbsp;Matej Veis,&nbsp;Mario Janda,&nbsp;Pavel Veis","doi":"10.1007/s11090-026-10680-6","DOIUrl":"10.1007/s11090-026-10680-6","url":null,"abstract":"<div><p>This work reports two different methods of quantifying iron (Fe) in plasma-activated water (PAW) using laser-induced breakdown spectroscopy assisted by acoustic levitation (LIBS-AL). The first method uses external calibration curves (CC) constructed from five different aqueous solutions Fe(NO₃)₃ · 9 H₂O standards with 4, 10, 20, 50, 100 ppm (mg/L). Three Fe II emission lines (238.23, 263.12, 275.58 nm) were chosen to verify the reproducibility and the response of the LIBS-AL technique in a PAW water sample with Fe debris. The limits of detection (LoD) were evaluated down to 1.8 ppm with R² ≥ 0.989. In the second case, multiple emission lines were used in a novel method which was based on a Boltzmann Plot (BP) and the center of mass (for all Fe concentrations) of all BPs were used to create a CC with LoD down to 6.8 ppm. The analysis of PAW prepared by transient spark discharge with electrospray yields Fe concentrations of 23.7 ± 3.0 ppm and 21.7 ± 1.5 ppm from the conventional and the multi-line CC method respectively. This is the first demonstration of LIBS-AL for Fe quantification in PAW. Compared to prior liquid-LIBS, the present approach simplifies sample preparation, avoids nebulizers, substrate contributions, and achieves comparable sensitivity in microliter volumes.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-026-10680-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172385","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}
引用次数: 0
Correction to: Separation of Plasma Agents Generated by Multi-Hollow Surface Dielectric Barrier Discharge and their Effects on Biological Samples 修正:多空心表面介质阻挡放电等离子体分离及其对生物样品的影响
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-04 DOI: 10.1007/s11090-026-10667-3
Martin Kuťka, Eliška Gálová, Sára Pišteková, Michal Stano, Veronika Medvecká, Stanislav Kyzek, Anna Zahoranová
{"title":"Correction to: Separation of Plasma Agents Generated by Multi-Hollow Surface Dielectric Barrier Discharge and their Effects on Biological Samples","authors":"Martin Kuťka,&nbsp;Eliška Gálová,&nbsp;Sára Pišteková,&nbsp;Michal Stano,&nbsp;Veronika Medvecká,&nbsp;Stanislav Kyzek,&nbsp;Anna Zahoranová","doi":"10.1007/s11090-026-10667-3","DOIUrl":"10.1007/s11090-026-10667-3","url":null,"abstract":"","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-026-10667-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172386","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}
引用次数: 0
Novel Thermal Plasma Methods for Scalable Synthesis of ZrC/SiC Ceramics via Carbothermic Reduction of Zircon-Bearing Minerals 含锆矿物碳热还原可扩展合成ZrC/SiC陶瓷的新型热等离子体方法
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-03 DOI: 10.1007/s11090-026-10676-2
L. Kumaresan, S. Christan Sam, G. Harish, J. Venkatesan, S. G. K. Manikandan, K. Jayasankar
{"title":"Novel Thermal Plasma Methods for Scalable Synthesis of ZrC/SiC Ceramics via Carbothermic Reduction of Zircon-Bearing Minerals","authors":"L. Kumaresan,&nbsp;S. Christan Sam,&nbsp;G. Harish,&nbsp;J. Venkatesan,&nbsp;S. G. K. Manikandan,&nbsp;K. Jayasankar","doi":"10.1007/s11090-026-10676-2","DOIUrl":"10.1007/s11090-026-10676-2","url":null,"abstract":"<div><p>Ultra-high-temperature ceramics play a crucial role in high-temperature applications, offering exceptional thermal stability, hardness, and strength. In this study, ZrC/SiC ceramic composites were directly synthesized from a natural zircon-bearing mineral via a thermal plasma arc-discharge-assisted carbothermic process. The formation of ZrC/SiC composites was investigated under varying milling durations and molar ratios of carbon. A mixture of milled ZrSiO<sub>4</sub> and carbon was processed in an argon and methane gas atmosphere at a plasma power of 15 kW. The results indicate that a ZrSiO<sub>4</sub>/C molar ratio of 1:7 in an argon atmosphere and 1:4 in a methane atmosphere significantly influenced the formation of ZrC/SiC composites. The crystal structure, morphology, and elemental composition of the synthesized samples were analyzed using various characterization techniques. The plasma-prepared ZrC/SiC ceramic composite exhibited low thermal conductivity, higher hardness, and compressive strength. Additionally, thermodynamic free energy minimization analysis was employed to investigate the reaction mechanisms, phase formation, and stability of the ZrC/SiC composite at a 1:7 molar ratio. These insights provide a deeper understanding of the synthesis process and pave the way for further optimization of UHTC manufacturing.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172439","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}
引用次数: 0
Distribution of Products and Selective Regulation of DRM in Atmospheric Pressure Microsecond Pulsed Plasma 大气压微秒脉冲等离子体中DRM的产物分布及选择性调控
IF 2.5 3区 物理与天体物理
Plasma Chemistry and Plasma Processing Pub Date : 2026-06-03 DOI: 10.1007/s11090-026-10679-z
Wei Wang, Si-Si Li, Zhi Zheng, De-Zheng Yang, Yue Liu
{"title":"Distribution of Products and Selective Regulation of DRM in Atmospheric Pressure Microsecond Pulsed Plasma","authors":"Wei Wang,&nbsp;Si-Si Li,&nbsp;Zhi Zheng,&nbsp;De-Zheng Yang,&nbsp;Yue Liu","doi":"10.1007/s11090-026-10679-z","DOIUrl":"10.1007/s11090-026-10679-z","url":null,"abstract":"<div><p>The study proposes a plasma-assisted dry reforming of methane (DRM) technology driven by a microsecond pulsed power supply, achieving high CO<sub>2</sub> conversion and high product yield under atmospheric pressure and producing multiple species, including H<sub>2</sub>, CO, C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>4</sub> and C<sub>2</sub>H<sub>6</sub>. The work focuses on elucidating how key operation parameters such as the CH<sub>4</sub>/CO<sub>2</sub> ratio, total flow rate, pulse peak voltage, and pulse repetition frequency regulate product distribution and selectivity. Furthermore, optical emission spectroscopy is utilized to analyze the formation pathways of critical reactive species and to elucidate the underlying plasma reaction mechanisms during the discharge process. Research has demonstrated that the gas composition is a pivotal parameter for regulating the H<sub>2</sub>/CO molar ratio and the product distribution. As the CH<sub>4</sub>/CO<sub>2</sub> ratio decreases from 3 to 1/3, the H<sub>2</sub>/CO molar ratio in the resulting syngas drops significantly from 6.76 to 0.22, spanning a wide range that can meet the requirements of various industrial applications. In circumstances where the concentration of CO<sub>2</sub> is marginally elevated, the system exhibits a syngas ratio that approaches unity. The selectivity of CO reaches 57.48%. The enhancement of both the pulse peak voltage and the pulse repetition frequency has been demonstrated to increase the energy input. Furthermore, the rise in frequency has been shown to strengthen the CO formation pathway, thereby achieving an energy efficiency of 66.67 mmol/kJ. The experimental results demonstrate that the conversion rates of CH<sub>4</sub> and CO<sub>2</sub> reach 47.11% and 42.49%, respectively. The production rates of H<sub>2</sub> and CO reach 589.23 mmol/h and 465.02 mmol/h, respectively, while the maximum production rate of C<sub>2</sub>H<sub>2</sub> is 49.47 mmol/h. In summary, the optimization of operating parameters effectively regulates product distribution, improves energy utilization efficiency, and provides theoretical support for efficient syngas generation.</p></div>","PeriodicalId":734,"journal":{"name":"Plasma Chemistry and Plasma Processing","volume":"46 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11090-026-10679-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172441","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}
引用次数: 0
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