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Electrophoretic Deposition of Multi‐Walled Carbon Nanotubes: The Key Role of Plasma Functionalization and Polymerization 多壁碳纳米管的电泳沉积:等离子体功能化和聚合的关键作用
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-09-12 DOI: 10.1002/ppap.202400137
Lynn Hein, Sylvain Coulombe, Renzo Cecere, Rosaire Mongrain
The electrophoretic deposition of multi‐walled carbon nanotubes (MWCNTs) has been well‐researched; however, preparatory steps lead to MWCNT coating contamination and deposits often have weak adhesion to the substrate. This work targets these two weaknesses. First, MWCNTs were functionalized by nonthermal, radiofrequency plasma, producing oxygenated MWCNTs (O‐MWCNTs), with which water‐based suspensions were prepared. Second, an ethane‐based plasma polymer was applied on the metallic substrate as an interlayer to improve coating adhesion. O‐MWCNT coatings were produced at 5–40 V for 1–60 min. Homogeneous coatings with thicknesses up to 10 µm were achieved, the composition was 90‐95 at% carbon with the balance element being oxygen, and coating adhesion without damage was confirmed for shear stresses up to 16 Pa.
多壁碳纳米管(MWCNTs)的电泳沉积已经得到了充分的研究;然而,准备步骤会导致 MWCNT 涂层污染,而且沉积物与基底的附着力通常较弱。本研究针对这两个弱点进行了研究。首先,通过非热射频等离子体对 MWCNTs 进行功能化,生成含氧 MWCNTs(O-MWCNTs),并用其制备水基悬浮液。其次,在金属基底上使用乙烷基等离子聚合物作为中间层,以提高涂层的附着力。O-MWCNT 涂层在 5-40 V 的电压下持续 1-60 分钟。获得了厚度达 10 µm 的均匀涂层,碳的成分占 90-95% ,其余元素为氧,涂层附着力在剪切应力达 16 Pa 时无损坏。
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引用次数: 0
Effect of the pH on the Formation of Gold Nanoparticles Enabled by Plasma‐Driven Solution Electrochemistry 等离子体驱动的溶液电化学对金纳米粒子形成的 pH 值影响
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-09-03 DOI: 10.1002/ppap.202400140
Jae Hyun Nam, Peter Bruggeman
Plasma‐driven solution electrochemistry offers alternatives to wet‐chemical methods for synthesizing nanomaterials. This study examines how precursor solution pH affects gold nanoparticle formation, specifically the conversion of precursor ions by solvated electrons and H2O2, and particle size. Our experiments show that –enabled autocatalytic reduction selectivity is 43%–65%, suggesting a catalytic decomposition of by gold nanoparticles. The solubility of gold monomers, increasing with decreasing pH, influences nucleation and resulting particle size, affecting the particle size distribution significantly at pH between 3 and 5. A 1‐D film reaction‐diffusion model quantitatively reproduces and explains the experimental results, demonstrating the impact of pH on different plasma‐produced species, enabling the gold ion conversion and nucleation rates, which directly impact particle size distributions.
等离子体驱动溶液电化学为合成纳米材料提供了湿化学方法的替代方法。本研究探讨了前驱体溶液的 pH 值如何影响金纳米粒子的形成,特别是溶解电子和 H2O2 对前驱体离子的转化以及粒子大小的影响。我们的实验表明,金纳米粒子的自催化还原选择性为 43%-65%,这表明金纳米粒子可催化分解。金单体的溶解度随着 pH 值的降低而增加,这影响了成核和由此产生的颗粒大小,在 pH 值介于 3 和 5 之间时,颗粒大小分布受到很大影响。一维薄膜反应-扩散模型定量地再现和解释了实验结果,证明了 pH 值对不同等离子体生成物的影响,使金离子的转化率和成核率得以提高,这直接影响到粒度分布。
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引用次数: 0
Issue Information: Plasma Process. Polym. 9/2024 发行信息:等离子工艺。Polym.9/2024
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-09-03 DOI: 10.1002/ppap.202370044
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引用次数: 0
Outside Front Cover: Plasma Process. Polym. 9/2024 封面外页:等离子工艺Polym.9/2024
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-09-03 DOI: 10.1002/ppap.202370043
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引用次数: 0
Effects of cold atmospheric plasma‐treated medium on HaCaT and HUVEC cells in vitro 冷大气等离子处理介质对体外 HaCaT 和 HUVEC 细胞的影响
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-08-30 DOI: 10.1002/ppap.202400132
Mingyan Chen, Junjin Chen, Tian Xie, Zheng Chen, Guimin Xu
Cold atmospheric plasma (CAP) is an emerging technology that can generate various reactive oxygen and nitrogen species (RONS) at room temperature and shows promising applications for skin wound healing. The effects of plasma‐treated medium (PTM) promoting cell proliferation have been verified, but the biological mechanisms involved are not well known. This study aims to assess the proliferation effect and mechanism induced by PTM on human keratinocyte cells (HaCaT) and human umbilical vein endothelial cells (HUVEC) in vitro. The results showed that the concentrations of H2O2 and NO2 inside PTM increased in a time‐dependent manner as the atmospheric pressure plasma jet (APPJ) treatment time was prolonged. The biological outcomes were determined by cell counting kit, wound healing assay, flow cytometry, enzyme‐linked immunosorbent assay (ELISA), and western blot analysis. The cell viability and motility assays indicated that appropriate plasma conditions of short treatment time (15s‐, 30s‐ and 45s‐PTM) could promote cell proliferation, while long treatment time would inhibit cell proliferation (60s‐PTM). With an appropriate time of PTM treatment, the secretion of vascular endothelial growth factor‐α (VEGF‐α) and transforming growth factor alpha (TGF‐α) was promoted and the extracellular signal‐regulated kinase/serine‐threonine protein kinase pathways were activated, which induced HaCaT and HUVEC cell proliferation eventually. These behaviors of cells were mainly related to the enhancement of intracellular reactive oxygen species levels. These findings established a theoretical foundation for potential clinical applications of PTM in wound healing.
冷大气等离子体(CAP)是一种新兴技术,可在室温下产生各种活性氧和氮物种(RONS),在皮肤伤口愈合方面具有广阔的应用前景。等离子体处理介质(PTM)促进细胞增殖的效果已得到验证,但其中的生物学机制尚不清楚。本研究旨在评估 PTM 在体外诱导人角质细胞(HaCaT)和人脐静脉内皮细胞(HUVEC)增殖的效果和机制。结果表明,随着常压等离子体射流(APPJ)处理时间的延长,PTM 内 H2O2 和 NO2- 的浓度呈时间依赖性增加。生物学结果通过细胞计数试剂盒、伤口愈合试验、流式细胞术、酶联免疫吸附试验(ELISA)和免疫印迹分析进行测定。细胞活力和运动试验表明,适当的血浆条件下,短处理时间(15 秒、30 秒和 45 秒-PTM)可促进细胞增殖,而长处理时间(60 秒-PTM)则会抑制细胞增殖。适当的 PTM 处理时间可促进血管内皮生长因子-α(VEGF-α)和转化生长因子α(TGF-α)的分泌,激活细胞外信号调节激酶/丝氨酸-苏氨酸蛋白激酶通路,最终诱导 HaCaT 和 HUVEC 细胞增殖。细胞的这些行为主要与细胞内活性氧水平的提高有关。这些发现为 PTM 在伤口愈合中的潜在临床应用奠定了理论基础。
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引用次数: 0
Hydrogen production in microwave discharge in water with barbotage of methane at atmospheric pressure: Experiment and modeling 常压下微波放电在水中与甲烷掺混制氢:实验与建模
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-08-29 DOI: 10.1002/ppap.202400139
Т. S. Batukaev, I. V. Bilera, G. V. Krashevskaya, I. L. Epstein, Yu. A. Lebedev, A. V. Tatarinov, A. Yu. Titov
Gas chromatography was used to study the products of an atmospheric pressure microwave discharge in water with methane bubbling at incident microwave power ranging between 500 and 650 W and methane flow rate ranging between 25 and 75 mL/min. The main components of products are H2, CO, CO2, and CH4. The concentration of H2 reaches 75% with the energy consumption for hydrogen formation of 25 L/kWh. A zero‐dimensional self‐consistent nonstationary discharge model, which takes into account the process of quenching of reaction products, was developed to analyze experimental results and study mechanisms of the formation of hydrogen and carbon oxides. Taking into account the quenching of reaction products is an important and necessary part of modeling discharges in liquids.
在入射微波功率介于 500 至 650 W 之间、甲烷流速介于 25 至 75 mL/min 之间的条件下,使用气相色谱法研究了常压微波放电在水中甲烷气泡中的产物。产物的主要成分是 H2、CO、CO2 和 CH4。H2 的浓度达到 75%,氢气形成的能耗为 25 升/千瓦时。为分析实验结果和研究氢气和碳氧化物的形成机理,开发了一个零维自洽非稳态放电模型,该模型考虑了反应产物的淬火过程。考虑反应产物的淬火过程是液体放电建模的重要和必要部分。
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引用次数: 0
The dynamics and transport of ozone in the gas and liquid phase generated by air surface microdischarge plasma at atmospheric pressure 大气压下空气表面微放电等离子体产生的臭氧在气相和液相中的动力学和传输
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-08-28 DOI: 10.1002/ppap.202400112
Zhiwei Wang, Chen Liu, Chunlei Feng, Cuizhen Wang, Longwei Chen, Hongbin Ding, Xiaoqian Cui
This contribution focuses on the spatial‐temporal behavior and reactive pathways of O3 produced by a surface air microdischarge in the gas and liquid phase using ultraviolet absorption spectroscopy. The findings demonstrate that mode transition from ozone to nitrogen oxide over time is observed at a constant input power higher than ~0.60 W/cm2. Due to the long‐lived characteristic and ionic wind, the perpendicular distribution of O3 is almost uniform. The maximum penetration depth is around 5 mm, and the gas–liquid mass transfer efficiency is approximately 0.4‱ at a depth of 1 mm, when the treatment time is 10 min. The mass transfer of O3 between gas and liquid phases is dominated by the liquid convention induced by ionic wind.
这篇论文利用紫外线吸收光谱学,重点研究了表面空气微放电在气相和液相中产生的臭氧的时空行为和反应途径。研究结果表明,当恒定输入功率高于 ~0.60 W/cm2 时,可观察到臭氧随时间向氧化氮的模式转变。由于臭氧的长寿命特性和离子风,O3 的垂直分布几乎是均匀的。最大穿透深度约为 5 毫米,当处理时间为 10 分钟时,1 毫米深度的气液传质效率约为 0.4‱。O3 在气相和液相之间的传质主要是由离子风引起的液体约定所主导的。
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引用次数: 0
Physical and chemical diagnostics of cold atmospheric pressure argon plasma jet 冷大气压氩等离子体射流的物理和化学诊断
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-08-28 DOI: 10.1002/ppap.202400077
Mohammad Reza Lotfi, Pouria Akbar Tehrani, Mohammadreza Khani, Elahe Razaghiha, Erfan Ghasemi, Babak Shokri
This article presents an experimental investigation of an argon plasma jet. It examines a commercial argon plasma jet device's physical, chemical, and biological impacts, comparing findings against global standards. The study focuses on electrical features ensuring safety for patients and consumers, finding all leakage current values within established standards. Chemical analysis of emitted gases shows no detectable levels of harmful compounds near treated skin. Optical emission spectroscopy reveals bioactive compounds within the plasma jet. UV radiation emission remains within safety thresholds. Hyperspectral imaging shows temporary increases in skin characteristics posttreatment, reverting to baseline over time. Overall, the study demonstrates the safety and potential of the argon plasma jet in skin treatment.
本文介绍了对氩等离子体喷射的实验研究。它研究了商用氩等离子体喷射装置的物理、化学和生物影响,并将研究结果与全球标准进行了比较。研究的重点是确保患者和消费者安全的电气特性,发现所有泄漏电流值均符合既定标准。对发射气体的化学分析显示,在治疗过的皮肤附近检测不到有害化合物。光学发射光谱显示等离子射流中含有生物活性化合物。紫外线辐射仍在安全阈值范围内。高光谱成像显示,治疗后皮肤特征会暂时增加,但随着时间的推移会恢复到基线水平。总之,这项研究证明了氩等离子体射流在皮肤治疗中的安全性和潜力。
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引用次数: 0
Generation and migration of CO in CO2 DBD glow plasma under Martian pressure 火星压力下 CO2 DBD 辉光等离子体中 CO 的生成和迁移
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-08-27 DOI: 10.1002/ppap.202400085
Qiang Fu, Zifan Ye, Honglin Guo, Zhixin Duan, Jialun Luo, Zhengshi Chang
Dielectric barrier discharge (DBD) plasma is a potential tool in the field of in situ CO2 conversion with the low‐pressure environment of Mars. CO is an important intermediate product in the conversion process of CO2. Understanding the pathways and dynamics that govern the generation of CO in CO2 plasmas establishes the foundation for effective regulation. In this work, parallel‐plate DBD structure was employed in our experiment and one‐dimensional fluid simulation model. The findings indicate that CO primarily originates at the boundary of the cathode potential fall region, and it subsequently migrates toward the surface of instantaneous cathode where it accumulates. The thickness of CO‐enriched region is approximately 0.8 mm. During this process, CO migration speed reaches about 2000 m/s. It is worth noting that surface reactions at the instantaneous cathode and anode surfaces contribute only 0.24% to CO generation, in contrast to the predominant influence of impact dissociation reaction between CO2 and electrons (e + CO2 → 2e + CO + O+) at 53.21%, and two‐body decomposition reaction between O+ and CO2 (O+ + CO2 → O +2 + CO) at 35.88%. Finally, the primary factors influencing the migration of CO from production sites to enrichment regions are determined to be particle collisions and momentum exchange between ions and CO, followed by electro‐hydro dynamics force, while dielectrophoresis forces have minimal effect.
介质阻挡放电(DBD)等离子体是在火星低压环境下进行二氧化碳就地转化的一种潜在工具。二氧化碳是二氧化碳转化过程中的重要中间产物。了解二氧化碳等离子体中产生二氧化碳的途径和动态,为有效调节奠定了基础。在这项工作中,我们在实验和一维流体模拟模型中采用了平行板 DBD 结构。研究结果表明,CO 主要起源于阴极电位下降区的边界,随后向瞬时阴极表面迁移,并在该处聚集。CO 富集区的厚度约为 0.8 毫米。在此过程中,CO 的迁移速度约为 2000 米/秒。值得注意的是,瞬时阴极和阳极表面的表面反应对 CO 生成的贡献率仅为 0.24%,相比之下,CO2 与电子之间的撞击解离反应(e + CO2 → 2e + CO + O+)和 O+ 与 CO2 之间的双体分解反应(O+ + CO2 → O +2 + CO)对 CO 生成的贡献率分别为 53.21%和 35.88%。最后,确定影响 CO 从产地向富集区迁移的主要因素是粒子碰撞和离子与 CO 之间的动量交换,其次是电-水动力学力,而介电泳力的影响微乎其微。
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引用次数: 0
Organic reactions in plasma–liquid systems for environmental applications 等离子体-液体系统中的有机反应在环境中的应用
IF 3.5 3区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2024-08-23 DOI: 10.1002/ppap.202400149
Yury Gorbanev, Anton Nikiforov, Igor Fedirchyk, Annemie Bogaerts
Plasma–liquid systems are best recognised in biomedicine, where the generation of plasma‐treated water and complex organic‐containing solutions affords biological effects. However, plasma interactions with liquids are more diverse. In this review, we look from the chemical point of view at the three fields of plasma–liquid interaction in which plasma is used to convert organic substrates. In wastewater treatment, plasma decomposes organic substances: the selectivity towards specific products is less crucial than process energy costs. In the conversion of organic liquids for sustainable energy purposes, the carbon and hydrogen selectivity to syngas are important, but these are still destructive reactions yielding small molecules. Finally, we provide a comprehensive plasma application list for synthetic organic chemistry and discuss their mechanisms and limitations.
等离子体-液体系统在生物医学中最为常见,等离子体处理过的水和含有复杂有机物的溶液会产生生物效应。然而,等离子体与液体的相互作用则更加多样化。在本综述中,我们将从化学角度探讨等离子体与液体相互作用的三个领域,在这三个领域中,等离子体被用来转化有机基质。在废水处理中,等离子体分解有机物:对特定产品的选择性比工艺能源成本更重要。在将有机液体转化为可持续能源的过程中,碳和氢对合成气的选择性非常重要,但这些仍然是产生小分子的破坏性反应。最后,我们提供了一份全面的有机合成化学等离子体应用清单,并讨论了它们的机理和局限性。
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引用次数: 0
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Plasma Processes and Polymers
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