المؤلفون: Jonathan E. Thomas, Katharina Stapelmann

المصدر: Plasma, Vol 7, Iss 2, Pp 386-426 (2024)

مصطلحات موضوعية: plasma control, predictive control, cold atmospheric plasma, machine learning, plasma processing, dielectric barrier discharge, Physics, QC1-999, Plasma physics. Ionized gases, QC717.6-718.8

الوصف: Cold atmospheric plasmas (CAPs) within recent years have shown great promise in the field of plasma medicine, encompassing a variety of treatments from wound healing to the treatment of cancerous tumors. For each subsequent treatment, a different application of CAPs has been postulated and attempted to best treat the target for the most effective results. These treatments have varied through the implementation of control parameters such as applied settings, electrode geometries, gas flow, and the duration of the treatment. However, with such an extensive number of variables to consider, scientists and engineers have sought a means to accurately control CAPs for the best-desired effects in medical applications. This paper seeks to investigate and characterize the historical precedent for the use of plasma control mechanisms within the field of plasma medicine. Current control strategies, plasma parameters, and control schemes will be extrapolated through recent developments and successes to gain better insight into the future of the field and the challenges that are still present in the overall implementation of such devices. Proposed approaches, such as data-driven machine learning, and the use of closed-loop feedback controls, will be showcased as the next steps toward application.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2571-6182/7/2/22Test; https://doaj.org/toc/2571-6182Test

الوصول الحر: https://doaj.org/article/a40648822d5847fdaf9d63af770bffe3Test

المؤلفون: Kenji Ishikawa, Kazunori Koga, Noriyasu Ohno

المصدر: Plasma, Vol 7, Iss 1, Pp 160-177 (2024)

مصطلحات موضوعية: plasma-driven sciences, plasma processing, plasma-wall interactions, plasma agriculture, plasma seed science, Physics, QC1-999, Plasma physics. Ionized gases, QC717.6-718.8

الوصف: Plasma-driven science is defined as the artificial control of physical plasma-driven phenomena based on complex interactions between nonequilibrium open systems. Recently, peculiar phenomena related to physical plasma have been discovered in plasma boundary regions, either naturally or artificially. Because laboratory plasma can be produced under nominal conditions around atmospheric pressure and room temperature, phenomena related to the interaction of plasma with liquid solutions and living organisms at the plasma boundaries are emerging. Currently, the relationships between these complex interactions should be solved using science-based data-driven approaches; these approaches require a reliable and comprehensive database of dynamic changes in the chemical networks of elementary reactions. Consequently, the elucidation of the mechanisms governing plasma-driven phenomena and the discovery of the latent actions behind these plasma-driven phenomena will be realized through plasma-driven science.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2571-6182/7/1/11Test; https://doaj.org/toc/2571-6182Test

الوصول الحر: https://doaj.org/article/6de1109ed7c341029c3ac38793672f65Test

المؤلفون: E. J. M. Van Heesch, T. Huiskamp, K. Yan, F. J. C. M. Beckers, H. W. M. Smulders, G. J. J. Winands, R. H. P. Lemmens, P. P. M. Blom, S. Davalos Segura, W. F. L. M. Hoeben, S. V. B. Van Paasen, J. J. Van Oorschot, A. G. A. Bonkestoter, M. L. J. Van Den Brand, M. Hennink, R. W. J. Smulders, A. J. M. Pemen, P. C. T. Van Der Laan

المصدر: Frontiers in Chemistry, Vol 12 (2024)

مصطلحات موضوعية: cold plasma, nanosecond pulses, pulsed processing, plasma processing, VOC, emission control, Chemistry, QD1-999

الوصف: A promising pollution control technology is cold plasma driven chemical processing. The plasma is a pulsed electric gas discharge inside a near atmospheric-pressure-temperature reactor. The system is energized by a continuous stream of very short high-voltage pulses. The exhaust gas to be treated flows through the reactor. The methods applied involve the development of robust cold plasma systems, industrial applications and measuring technologies. Tests of the systems were performed at many industrial sites and involved control of airborne VOC (volatile organic compound) and odor. Electrical, chemical and odor measuring data were collected with state-of-the-art methods. To explain the test data an approximate solution of global reaction kinetics of pulsed plasma chemistry was developed. It involves the Lambert function and, for convenience, a simple approximation of it. The latter shows that the amount of removal, in good approximation, is a function of a single variable. This variable is electric plasma power divided by gas flow divided by input concentration. In the results sections we show that in some cases up to 99% of volatile pollution can be removed at an acceptable energy requirement. In the final sections we look into future efficiency enhancements by implementation of (sub)nanosecond pulsed plasma and solid state high-voltage technology and by integration with catalyst technology.

وصف الملف: electronic resource

العلاقة: https://www.frontiersin.org/articles/10.3389/fchem.2024.1386055/fullTest; https://doaj.org/toc/2296-2646Test

الوصول الحر: https://doaj.org/article/40e3ccd3cc2c496bbc9abd60a7657904Test

المؤلفون: Ruoyu Han, Yuchen Cao, Pengfei Li, Jing Xie, Xi Chen

المصدر: Energy Reports, Vol 9, Iss , Pp 213-220 (2023)

مصطلحات موضوعية: Aerogel, Nanomaterial preparation, Surface modification, Plasma processing, Electrical explosion, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

الوصف: Aerogels are environmentally friendly materials with high specific surface area and high adsorption. However, pure aerogels are challenging to meet the requirements of mechanical properties, thermal insulation and hydrophobicity. Therefore, the surface functionalization of aerogel materials is necessary. Electrical explosion is a controllable, convenient and low-cost plasma generation method that can be used for surface modification of nanoparticles (NPs). The electrical parameters and spatial–temporal resolved images were recorded to analyze the behaviors of SiO2 aerogel with different metal plasmas (Cu wire and W wire). By characterizing the explosive products with SEM/EDS/TEM, it was found that the Cu/W NPs produced by the electrical explosion were uniformly deposited and embedded in the SiO2 aerogel. The particle size of W NPs was larger than that of Cu NPs, with average particle sizes of 212.7 nm and 31.6 nm, respectively. The lattice structure and chemical composition of the products were analyzed by XRD and XPS. The XRD results confirmed that the newly emerged diffraction peaks correspond to specific crystal faces of Cu and W, respectively. In addition, the XPS results showed that only a tiny amount of copper existed in the form of CuO, indicating that the product modified by the electrical explosion method was purer. In order to study the applicability of electrical explosion, experiments were also designed to explore the effect of Cu NPs deposition on graphene aerogels. The results showed that it also achieved uniform doping and modification effects well. This technology could be favorable in fabricating and modifying energy-related materials that require specific functions in the future.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2352484723004225Test; https://doaj.org/toc/2352-4847Test

الوصول الحر: https://doaj.org/article/7b2e942deaa14cc8be10693128278d9bTest

المؤلفون: Villeneuve-Faure, C, Mitronika, Maria, Dan, A, P, Boudou, Laurent, Ravisy, William, Besland, M, P, Richard-Plouet, Mireille, Goullet, Antoine

المساهمون: Diélectriques Solides et Fiabilité (LAPLACE-DSF), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Institut des Matériaux de Nantes Jean Rouxel (IMN), Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - Ecole Polytechnique de l'Université de Nantes (Nantes Univ - EPUN), Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), French GDR SEEDS

المصدر: EISSN: 2632-959X ; Nano Express ; https://hal.science/hal-04549301Test ; Nano Express, 2024, 5 (1), pp.015010. ⟨10.1088/2632-959x/ad220d⟩

مصطلحات موضوعية: TiO2-SiO2 nanocomposite thin films, atomic force microscopy, low-pressure plasma processing, dielectric thin films, [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS]Physics [physics]

الوصف: International audience ; In this paper, nanocomposites (TiO 2 in SiO 2 ) are produced by an advanced hybrid aerosol-PECVD method based on direct liquid injection of a non-commercial colloidal solution in an O 2 / hexamethyldisiloxane (HMDSO) low-pressure plasma. Dielectric properties are investigated at nanoscale using techniques derived from Atomic Force Microcopy in terms of relative dielectric permittivity, charge injection and transport. Results show that a concentration in TiO 2 up to 14% by volume makes it possible to increase the relative dielectric permittivity up to 4.8 while maintaining the insulating properties of the silica matrix. For a TiO 2 concentration in the range 15%–37% by volume, the relative dielectric permittivity increases (up to 11 for 37% TiO 2 by volume) and only few agglomerated nanoparticles lowering the insulating properties are observed. For TiO 2 concentration above 40% by volume, the relative dielectric permittivity still increases but the quantity of agglomerated nanoparticles is very high, which greatly increases the charge transport dynamic and degrades the insulating properties. Finally, 37% of TiO 2 by volume in the SiO 2 matrix appears to be the best compromise, between high dielectric permittivity and low leakage current for the MIM applications aimed.

العلاقة: hal-04549301; https://hal.science/hal-04549301Test; https://hal.science/hal-04549301/documentTest; https://hal.science/hal-04549301/file/Villeneuve-Faure_2024_Nano_Express_5_015010.pdfTest

الإتاحة: https://doi.org/10.1088/2632-959x/ad220dTest
https://hal.science/hal-04549301Test
https://hal.science/hal-04549301/documentTest
https://hal.science/hal-04549301/file/Villeneuve-Faure_2024_Nano_Express_5_015010.pdfTest

المؤلفون: Khanit Matra, Wanattapong Aryuwong, Wichayada Meetang, Suparada Ruthairat, Chanchai Dechthummarong, Wutthichok Sangwang, Vijitra Luang-In

المصدر: IEEE Access, Vol 11, Pp 114777-114789 (2023)

مصطلحات موضوعية: Inulin, polysaccharide, depolymerization, antioxidant, plasma–liquid interactions, solution plasma processing, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

الوصف: This work proposes a novel technique for biological compound transformation by a circulating electrical breakdown in the liquid (EBL) process. The EBL reactor has been designed with a cylindrical, hourglass-shaped structure that facilitates plasma generation within a 1 mm gap between two pin electrodes at the neck of the reactor. During the EBL process, the inulin solution was flown upward and brought into direct contact with the plasma before recirculating back to the bottom of the reactor for subsequent retreatment. Consequently, it enabled a continuous and thorough inulin treatment. At this time, the influence of the supplied voltage (3.20, 3.76, and 4.32 kVpeak at 50 Hz positive half-wave) for the EBL process generation on the inulin structural transformation was investigated. The most optimal condition in the EBL process was operated at 4.32 kVpeak supplied voltage within the optimal inulin treatment duration of 20 min. Regarding the experimental results, it could be confirmed that the EBL process has the potential to depolymerize the inulin structure. One gram of inulin was dissolved in 100 mL of deionized water and treated under the EBL process for 20 min. Inulin structures were deformed from a 20- $100 \mu \text{m}$ micro spherical shapes into small flakes. Moreover, the DPPH free radical scavenging analysis showed that the antioxidant activity and the prebiotic activity of treated inulin have been improved by 311%, and 35%, respectively.

وصف الملف: electronic resource

العلاقة: https://ieeexplore.ieee.org/document/10268923Test/; https://doaj.org/toc/2169-3536Test

الوصول الحر: https://doaj.org/article/8f9099dd4d7646b3879e66523480b48eTest

المؤلفون: C Villeneuve-Faure, M Mitronika, A P Dan, L Boudou, W Ravisy, M P Besland, M Richard-Plouet, A Goullet

المصدر: Nano Express, Vol 5, Iss 1, p 015010 (2024)

مصطلحات موضوعية: TiO2–SiO2 nanocomposite thin films, atomic force microscopy, low-pressure plasma processing, dielectric thin films, Chemical technology, TP1-1185

الوصف: In this paper, nanocomposites (TiO _2 in SiO _2 ) are produced by an advanced hybrid aerosol-PECVD method based on direct liquid injection of a non-commercial colloidal solution in an O _2 / hexamethyldisiloxane (HMDSO) low-pressure plasma. Dielectric properties are investigated at nanoscale using techniques derived from Atomic Force Microcopy in terms of relative dielectric permittivity, charge injection and transport. Results show that a concentration in TiO _2 up to 14% by volume makes it possible to increase the relative dielectric permittivity up to 4.8 while maintaining the insulating properties of the silica matrix. For a TiO _2 concentration in the range 15%–37% by volume, the relative dielectric permittivity increases (up to 11 for 37% TiO _2 by volume) and only few agglomerated nanoparticles lowering the insulating properties are observed. For TiO _2 concentration above 40% by volume, the relative dielectric permittivity still increases but the quantity of agglomerated nanoparticles is very high, which greatly increases the charge transport dynamic and degrades the insulating properties. Finally, 37% of TiO _2 by volume in the SiO _2 matrix appears to be the best compromise, between high dielectric permittivity and low leakage current for the MIM applications aimed.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/2632-959XTest

الوصول الحر: https://doaj.org/article/988d8f0423cc496fb787a6b8e3a9cffcTest

المؤلفون: Ye Rin Lee, Do Yeob Kim, Jae Young Kim, Da Hye Lee, Gyu Tae Bae, Hyojun Jang, Joo Young Park, Sunghoon Jung, Eun Young Jung, Choon-Sang Park, Hyung-Kun Lee, Heung-Sik Tae

المصدر: Nanomaterials, Vol 14, Iss 1, p 40 (2023)

مصطلحات موضوعية: air–liquid discharge, organic compound decomposition, pin–liquid barrier discharge, pin–liquid discharge, plasma processing, total dissolved phosphorus, Chemistry, QD1-999

الوصف: To generate a stable and effective air–liquid discharge in an open atmosphere, we investigated the effect of the dielectric barrier on the discharge between the pin electrode and liquid surface in an atmospheric-pressure plasma reactor. The atmospheric-pressure plasma reactor used in this study was based on a pin–plate discharge structure, and a metal wire was used as a pin-type power electrode. A plate-type ground electrode was placed above and below the vessel to compare the pin–liquid discharge and pin–liquid barrier discharge (PLBD). The results indicated that the PLBD configuration utilizing the bottom of the vessel as a dielectric barrier outperformed the pin–liquid setup in terms of the discharge stability and that the concentration of reactive species was different in the two plasma modes. PLBD can be used as a digestion technique for determining the phosphorus concentration in natural water sources. The method for decomposing phosphorus compounds by employing PLBD exhibited excellent decomposition performance, similar to the performance of thermochemical digestion—an established conventional method for phosphorus detection in water. The PLBD structure can replace the conventional chemical-agent-based digestion method for determining the total dissolved phosphorus concentration using the ascorbic acid reduction method.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2079-4991/14/1/40Test; https://doaj.org/toc/2079-4991Test

الوصول الحر: https://doaj.org/article/0b2878613d07438c8bcbc6b87fc61f80Test

المؤلفون: Minsu Choi, Youngseok Lee, Yebin You, Chulhee Cho, Wonnyoung Jeong, Inho Seong, Byeongyeop Choi, Sijun Kim, Youbin Seol, Shinjae You, Geun Young Yeom

المصدر: Materials, Vol 16, Iss 16, p 5624 (2023)

مصطلحات موضوعية: plasma processing, greenhouse effect, greenhouse gas, global warming potential, alternative precursors, C4F8, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85

الوصف: This paper proposes the use of environmentally friendly alternatives, C6F6 and C4H2F6, as perfluorocarbon (PFC) and hydrofluorocarbon (HFC) precursors, respectively, for SiO2 plasma etching, instead of conventional precursors C4F8 and CHF3. The study employs scanning electron microscopy for etch profile analysis and quadrupole mass spectrometry for plasma diagnosis. Ion bombardment energy at the etching conditions is determined through self-bias voltage measurements, while densities of radical species are obtained using quadrupole mass spectroscopy. The obtained results compare the etch performance, including etch rate and selectivity, between C4F8 and C6F6, as well as between CHF3 and C4H2F6. Furthermore, greenhouse gas (GHG) emissions are evaluated using a million metric ton of carbon dioxide equivalent, indicating significantly lower emissions when replacing conventional precursors with the proposed alternatives. The results suggest that a significant GHG emissions reduction can be achieved from the investigated alternatives without a deterioration in SiO2 etching characteristics. This research contributes to the development of alternative precursors for reducing global warming impacts.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/1996-1944/16/16/5624Test; https://doaj.org/toc/1996-1944Test

الوصول الحر: https://doaj.org/article/eb7cc9d5599c426b9a57e264a096c7f0Test

المؤلفون: Sharma, Sarveshwar, Sirse, Nishant, Turner, Miles M., Kuley, Animesh

مصطلحات موضوعية: Computer simulation, Electronic engineering, Plasma processing, Plasmas

الوصف: Understanding electron and ion heating phenomenon in capacitively coupled radio-frequency plasma discharges is vital for many plasma processing applications. In this article, using particle-in-cell simulation technique we investigate the collisionless argon discharge excited by temporally asymmetric sawtooth-like waveform. In particular, a systematic study of the electric field nonlinearity and field reversal phenomenon by varying the number of harmonics and its effect on electron and ion heating is performed. The simulation results predict higher harmonics generation and multiple field reversal regions formation with an increasing number of harmonics along with the local charge separation and significant displacement current outside sheath region. The field reversal strength is greater during the expanding phase of the sheath edge in comparison to its collapsing phase causing significant ion cooling. The observed behavior is associated with the electron fluid compression/rarefaction and electron inertia during expanding and collapsing phase respectively.

وصف الملف: application/pdf

العلاقة: https://doras.dcu.ie/29976Test/; https://sciencedirect.com/science/article/abs/pii/S0375960124000410Test; https://doi.org/10.48550/arXiv.2309.08310Test; https://doras.dcu.ie/29976/1/Manuscript%20V8_SS_final.pdfTest; Sharma, Sarveshwar, Sirse, Nishant, Turner, Miles M. orcid logoorcid:0000-0001-9713-6198 and Kuley, Animesh (2023) A harmonic study of electric field nonlinearity and field reversal in collisionless capacitive discharges driven by sawtooth-like waveforms. Physics Letters A, 498 . p. 129346.

الإتاحة: https://doi.org/10.48550/arXiv.2309.08310Test
https://doras.dcu.ie/29976/1/Manuscript%20V8_SS_final.pdfTest