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Applicability of Drugs as Sustainable Corrosion Inhibitors 药物作为可持续缓蚀剂的适用性
Pub Date : 2023-10-01 DOI: 10.5185/amlett.2023.041732
Rajni Narang, Priya Vashishth, Himanshi Bairagi, Rashmi Sehrawat, S. Shukla, Bindu Mangla
and inorganic substances are used as inhibitors. The compounds generally containing atom having lone pair of electrons such as nitrogen (N), oxygen (O), Sulphur (S) and phosphorus (P) as well as a hydrophobic moiety that will repel aqueous corrosive species away from the metal surface and a mediately with an aromatic ring, unsaturation
无机物被用作抑制剂。该化合物通常含有具有孤对电子的原子,如氮(N)、氧(O)、硫(S)和磷(P),以及疏水部分,该部分将排斥水腐蚀性物质远离金属表面,并立即带有芳环,不饱和
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引用次数: 1
Automotive Plasma Painting Process 汽车等离子喷涂工艺
Pub Date : 2023-10-01 DOI: 10.5185/amlett.2023.041734
Giulia F. da Silva, Jorge Conceição Jr., Daiane T. da Silva, E. Santos
This study investigates the deposition of hydrogenated diamond-like carbon (DLC) films on SAE 1045 alloy samples using a plasma-enhanced chemical vapor deposition (PECVD) system and evaluates their potential as automotive coatings. Copper doping was performed via a hollow copper cathode to examine its effects on the DLC films. The primary focus was to determine the structural properties, color variations, and friction resistance of the coated samples, with the goal of establishing their applicability in the automotive industry. Raman spectroscopy confirmed the successful deposition of DLC films, while energy dispersive X-ray spectroscopy (EDS) analysis demonstrated the variation in copper atom concentrations in the samples based on the sputtering duration during the doping process. The observed color changes in the DLC films correlated with the copper atom concentrations, with the interference phenomenon and refractive index differences between DLC films and copper proposed as the primary factors influencing color variations. Scratch tests were conducted to evaluate the resistance to friction and delamination of the coated materials compared to conventionally painted steel samples. The results indicated that the DLC-coated materials exhibited higher resistance, with an estimated 15% increase in delamination resistance. The enhanced resistance was hypothesized to result from the high hardness of DLC films and the potential accumulation of nanoparticles in the valleys of the sample surface, reducing irregularities.
本研究利用等离子体增强化学气相沉积(PECVD)系统研究了在SAE 1045合金样品上沉积氢化类金刚石(DLC)薄膜,并评估了其作为汽车涂料的潜力。在空心铜阴极上掺杂铜,考察其对DLC薄膜的影响。主要重点是确定涂层样品的结构特性、颜色变化和摩擦阻力,目的是确定其在汽车工业中的适用性。拉曼光谱证实了DLC薄膜的成功沉积,而能量色散x射线光谱(EDS)分析表明,在掺杂过程中,样品中的铜原子浓度随溅射时间的变化而变化。DLC薄膜的颜色变化与铜原子浓度有关,干涉现象和DLC薄膜与铜之间的折射率差异是影响颜色变化的主要因素。进行了划痕试验,以评估涂层材料与传统涂漆钢样品相比的摩擦和分层阻力。结果表明,dlc涂层材料表现出更高的电阻,估计分层电阻提高了15%。增强的电阻被认为是由于DLC薄膜的高硬度和样品表面山谷中纳米颗粒的潜在积累,减少了不规则性。
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引用次数: 0
Effect of Mangifera indica extracted CuO NPs on seed germination of Cicer arietinum and Vigna radiata: an insight on biochemical, physiological and computational studies 芒果提取物CuO NPs对西芹和紫穗草种子萌发的影响:生化、生理和计算研究
Pub Date : 2023-10-01 DOI: 10.5185/amlett.2023.041735
Ananya Kashyap, Madhubala Kumari, Suman Kumar, Samira Nazma, K. Mukherjee, D. Maity
Biosynthesized metal oxide nanoparticles are used as nano-fertilizers for sustainable agriculture as they have proven to be promising agents in increasing the germination rates and plant growth rate. Biosynthesis of copper oxide nanoparticles (CuO-NPs) was done for the first-time using extract of Mangifera indica leaves. Effects of assynthesized CuO NPs on the seed germination of two legume seeds are investigated at different concentrations (0 2.5 mg/ml). UV-Vis and EDX analysis confirm the formation of CuO NPs & FESEM images revealed spherical shape of NPs with particle size ranging from 105nm to 155nm. CuO-NPs also revealed to be highly stable in aqueous suspension with zeta potential value -21.1mV. Germination rate, root /shoot growth and protein estimated of Cicer arietinum and Vigna radiata seeds found to be highest at 2.5mg/ml and 1mg/ml concentration, respectively. Negative impact on germination rate and root/shoot growth was observed due to toxic effects when CuO-NPs were applied at higher concentration 2.5mg/ml to Vigna radiata seeds. Thus, it is concluded that optimum concentration of biosynthesized CuO-NPs can be used to enhance the growth of leguminous seeds because of their possible interaction with the proteins and their up-regulation as confirmed by bioinformatics studies and molecular docking of protein.
生物合成的金属氧化物纳米颗粒被用作可持续农业的纳米肥料,因为它们已被证明是提高发芽率和植物生长速度的有希望的剂。以芒果叶提取物为原料,首次进行了氧化铜纳米颗粒(CuO-NPs)的生物合成。研究了不同浓度(0 ~ 2.5 mg/ml)下合成的CuO NPs对两种豆科植物种子萌发的影响。UV-Vis和EDX分析证实了CuO NPs的形成,FESEM图像显示NPs为球形,粒径在105nm ~ 155nm之间。zno - nps在水悬浮液中具有很高的稳定性,zeta电位值为-21.1mV。在2.5mg/ml和1mg/ml浓度下,黄花苜蓿种子的发芽率、根冠生长和蛋白质含量最高。2.5mg/ml浓度的CuO-NPs对紫穗槐种子的发芽率和根冠生长均有不良影响。因此,生物信息学研究和蛋白质的分子对接证实,最佳浓度的生物合成CuO-NPs可能与蛋白质相互作用并上调,从而促进豆科植物种子的生长。
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引用次数: 0
Phenoxy-imine based Mononuclear Zn(II) Compounds: Applications as Polymerization Catalysts 基于苯氧亚胺的单核Zn(II)化合物:作为聚合催化剂的应用
Pub Date : 2023-10-01 DOI: 10.5185/amlett.2023.041733
D. Chakraborty, S. Singha Roy, Saumendra N. Sarkar
The production of aliphatic polyesters (via ROP of cyclic esters) and aliphatic polycarbonates (via ROCOP of CO2/epoxide) is an important synthetic pathway for the production of biodegradable and biocompatible polymers. The study focuses on the catalytic activity and selectivity of phenoxy-imine based zinc compounds for the ROP of cyclic esters (rac-LA and -CL) and ROCOP of carbon dioxide and CHO/PO. The monoligated and bisligated zinc compounds have the same coordination number (four) but differed from each other in the binding mode of the ligand to the metal center (tridentate for monoligated and bidentate for bisligated compounds) and thus the compounds adopt different symmetry. For the ROP of rac-LA, the monoligated zinc compounds gave isotactic-enriched PLA while the bisligated zinc compounds gave heterotactic-enriched PLA. For the ROCOP of epoxide/CO2, isotactic-enriched polycarbonates were obtained with a notable difference in catalytic activity with the variation of the number of ligands attached to the zinc center. In addition, a correlation is established between the percentage of carbonate linkage in the polycarbonate chain and the substituent attached to the phenolate core.
脂肪族聚酯(通过环酯的ROP)和脂肪族聚碳酸酯(通过CO2/环氧化物的ROCOP)的生产是生产生物可降解和生物相容性聚合物的重要合成途径。研究了苯氧亚胺基锌化合物对环酯(rac-LA和 -CL)的ROCOP以及二氧化碳和CHO/PO的ROCOP的催化活性和选择性。单寡锌化合物和双偶锌化合物具有相同的配位数(4),但配体与金属中心的结合方式不同(单寡锌化合物为三齿状,双齿锌化合物为双齿状),因此化合物具有不同的对称性。对于rac-LA的ROP,单聚锌化合物得到等规富集PLA,而偶合锌化合物得到异规富集PLA。对于环氧化物/CO2的ROCOP,得到了等规富集的聚碳酸酯,其催化活性随着锌中心配体数量的变化而显著不同。此外,还建立了聚碳酸酯链中碳酸盐键的百分比与附着在酚酸核上的取代基之间的相关性。
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引用次数: 0
Emergence of R&D World Links for Decentralized Facilities and International Cooperation 分散设施和国际合作的研发世界联系的出现
Pub Date : 2023-10-01 DOI: 10.5185/amlett.2023.041731
Ashutosh Tiwari
The United Nations Sustainable Development Goals (UNSDGs) and the European Green Deal (EGD) are two examples of global sustainability initiatives that trust strongly on research and development (R&D) activities to achieve their targets. This article explores the synergies between R&D world links and decentralised labs, highlighting their capacity to foster sustainable innovations through international collaborations and the exchange of ideas. Climate efficient materials research is key element of sustainable ambition and distributed facilities offer a better chance of leading circular technology for green world. The participation from developed and developing countries in clean R&D are needed to be promoted through multi folds cooperation. The worldwide industrial R&D utilizes cluster research collaboration which should be focused on net-zero innovation for raising product technology readiness levels (TRLs). In addition, advancements in the green know-hows are helpful in deciding the direction of technology development and transition for climate neutral infrastructures. Institute of Advanced Materials, IAAM, Gammalkilsvägen 18, Ulrika 590 53, Sweden *Corresponding author E-mail: director@iaam.se Tel.: (+46) 1313-2424
联合国可持续发展目标(UNSDGs)和欧洲绿色协议(EGD)是全球可持续发展倡议的两个例子,它们强烈依赖研发活动来实现其目标。本文探讨了研发世界联系和分散实验室之间的协同作用,强调了它们通过国际合作和思想交流促进可持续创新的能力。气候高效材料研究是可持续发展目标的关键要素,分布式设施为绿色世界的循环技术提供了更好的机会。需要通过多方合作促进发达国家和发展中国家参与清洁研发。世界范围内的工业研发利用集群研究合作,应侧重于净零创新,以提高产品技术就绪水平(trl)。此外,绿色技术的进步有助于决定气候中性基础设施的技术发展和转型方向。通讯作者:E-mail: director@iaam.se联系电话:(+46)1313-2424
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引用次数: 0
Isolation & Characterization of Hydrocarbon Degrading Bacteria: A Bio-remedial Approach to Clean-up Oil Spills 烃类降解细菌的分离与表征:一种生物修复方法用于石油泄漏清理
Pub Date : 2023-10-01 DOI: 10.5185/amlett.2023.041736
Ayush Madan, Sanjeev Kumar, S. M. Waheed
the technologies are expensive and not very efficient to deal with recalcitrant pollutants. The present study deals with the bioremediation of crude oil. The study involved the collection of surface soil of the spillage/contaminated area to isolate and identify the oil-degrading bacteria. Bacteria were isolated and grown on MSM-agar medium containing crude oil as a carbon source in Petri-dishes. The isolated strain of bacteria was effective in the biodegradation of oil in 28 days. The samples were analysed using GC-FID which demonstrated efficient degradation of oil by the isolated microbe. The hydrocarbon degraders were identified as Gram-negative cocci bacteria. The isolated bacteria could serve as a cost-effective and efficient alternative for microbial degradation of hydrocarbon pollutants in soil and water in an environmentally friendly and sustainable manner.
这些技术昂贵,而且在处理顽固污染物方面效率不高。本文对原油的生物修复进行了研究。本研究收集溢油/污染区表层土壤,分离并鉴定原油降解菌。在以原油为碳源的msm -琼脂培养基上分离培养细菌。分离得到的菌株在28 d内生物降解油脂效果良好。用气相色谱- fid对样品进行了分析,结果表明分离的微生物对石油有有效的降解作用。烃类降解菌鉴定为革兰氏阴性球菌。分离出的细菌可以作为一种具有成本效益和效率的替代方法,以环境友好和可持续的方式降解土壤和水中的碳氢化合物污染物。
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引用次数: 0
Effects of Initial Surface Roughness and Sliding Speed Study on the Tribological Characteristics of AA6061 and CuZn37Pb2 Alloys 初始表面粗糙度和滑动速度对AA6061和CuZn37Pb2合金摩擦学特性的影响
Pub Date : 2023-07-01 DOI: 10.5185/amlett.2023.031727
Bougoffa M. Seyf Eddine, Sayhia Benchaa
The paper examines the influence of initial surface roughness and sliding speed on friction and wear behavior of AA6061 aluminum alloy and brass alloy (CuZn37Pb2) under dry contact using a CSM tribometer. Surface roughness of materials studied were measured using optical profilometer. Rough surfaces (Ra=0.37 1.33 μm) were prepared on two materials: AA6061 and CuZn37Pb2 alloy. Track width, wear rate, and wear loss values were assessed and contrasted with changes in coefficient of friction values at various starting surface roughness and sliding speeds. Experiments are conducted at sliding speed 0.15;0.24;0.35 and 0.48 m/s. wear track diameter 4;6;8;10 mm. Results show that wear loss, wear rate and track width of CuZn37Pb2 and AA6061 increase at high initial surface roughness and speed but the value of friction coefficient decreases. Various SEM analysis of the wear trace and worn surfaces for each alloy at different sliding speed were analysed and compared.
采用CSM摩擦计研究了初始表面粗糙度和滑动速度对AA6061铝合金和黄铜合金(CuZn37Pb2)干接触摩擦磨损性能的影响。用光学轮廓仪测量了所研究材料的表面粗糙度。在AA6061和CuZn37Pb2合金上制备了粗糙表面(Ra=0.37 1.33 μm)。评估了轨道宽度、磨损率和磨损损失值,并与不同启动表面粗糙度和滑动速度下摩擦系数值的变化进行了对比。分别在0.15、0.24、0.35、0.48 m/s的滑动速度下进行实验。磨损轨迹直径4;6;8;10毫米。结果表明:在高初始表面粗糙度和高速度下,CuZn37Pb2和AA6061的磨损损失、磨损率和轨迹宽度增大,摩擦系数减小;对各合金在不同滑动速度下的磨损痕迹和磨损表面的各种SEM分析进行了分析比较。
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引用次数: 0
Influence of NbC Addition in Aluminium Alloy A380 on Microstructure at Semi-Solid Processing Temperature 添加NbC对A380铝合金半固态加工温度下组织的影响
Pub Date : 2023-07-01 DOI: 10.5185/amlett.2023.031728
Bruno Arendarchuck, Luciano Lourençato, Hipolito Fals, Alexia Haagen
Semi-solid processing is a promising technique used to fabricate parts, minimize manufacturing steps post preparation, and reduce casting defects. The globular structure is the key in this process, a characteristic achieved with the partial remelting of material to temperatures between solidus and liquids. In this sense, the aim of this research is to evaluate the microstructure quality of the aluminium matrix composite (AMC) reinforced with NbC, after semi-solid treatment. Micron-sized NbC powder with 0 wt. %, 5 wt. %, 10 wt. %, and 15 wt. % was employed as reinforcement, to fabricate a composite through the stir casting method. Furthermore, was used an Al-5Ti-1B alloy grain refinement. Globularization heat treatment at 562 °C, with a holding time of the 90s, was realized. An optical microscope under conventional and polarized light and a scanning electron microscope (SEM) allows the microstructure analyses. The dendritic cell size (DCS), grain size (GS), shape factor (SF), and rheo quality index (RQI) were used to analyse the morphology and microstructure. The results show a general reduction of GS and DCS parameters with a higher amount of NbC. The AMC with NbC shows more globular microstructure when compared with non-reinforced alloy.
半固态加工技术是一种很有前途的技术,用于制造零件,减少制备后的制造步骤,减少铸件缺陷。球状结构是这一过程的关键,这一特性是通过将材料部分重熔到固体和液体之间的温度而实现的。因此,本研究的目的是评价半固态处理后NbC增强铝基复合材料(AMC)的显微组织质量。采用0 wt. %、5 wt. %、10 wt. %和15 wt. %的微米级NbC粉末作为增强剂,通过搅拌铸造法制备复合材料。进一步,采用了Al-5Ti-1B合金细化晶粒。在562℃下进行了球化热处理,保温时间为90℃。光学显微镜下的常规和偏振光和扫描电子显微镜(SEM)允许微观结构分析。采用树突状细胞尺寸(DCS)、晶粒尺寸(GS)、形状因子(SF)和流变质量指数(RQI)分析其形貌和微观结构。结果表明,随着NbC用量的增加,GS和DCS参数普遍降低。与非增强合金相比,含NbC的AMC表现出更多的球状组织。
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引用次数: 0
Antioxidant and Anti-inflammatory Activities of Polysaccharides from the Coat of Fermented and Unfermented Sugar Apple (Annona squamosa L.) Seed 发酵和未发酵苹果皮多糖的抗氧化和抗炎活性种子
Pub Date : 2023-07-01 DOI: 10.5185/amlett.2023.031729
Christianah Dare, O. Oyedapo
also shown the value of natural antioxidants in defending the body against free radicals and lowering the
也显示了天然抗氧化剂在保护身体免受自由基侵害和降低
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引用次数: 0
Laser-induced Micro-explosion: A Micro-zone Explosive Simulator for the Characterization of Explosives 激光诱导微爆炸:用于炸药表征的微区爆炸模拟器
Pub Date : 2023-07-01 DOI: 10.5185/amlett.2023.031726
Xianshuang Wang, Ruibin Liu
The determination of detonation performance and sensitivity is an important research content of explosive testing technology. However, the traditional test method usually requires a large amount of samples due to the limitation of the critical diameter and other detonation conditions. Therefore, it will inevitably bring great test risk, high test cost and measurement uncertainty. In this case, it is urgent to develop new testing technology with small dosage and high precision. Recently, a micro-zone explosive simulator for the characterization of explosives is proposed by Wang and Liu et.al. According to their work, laserinduced micro-explosion is produced by micrograms of explosives irritated by pulsed laser, has been proved to be closely related to macroscopic detonation. Therefore, it can be used as a micro-zone explosive simulator for the characterization of explosives. The aim of this letter is to shed new light on the determination of detonation performance and sensitivity and highlighted the importance of close integration of experimental, statistical, and theoretical efforts.
爆轰性能和灵敏度的测定是炸药试验技术的重要研究内容。然而,传统的测试方法由于受到临界直径等爆轰条件的限制,通常需要大量的样品。因此,必然带来较大的测试风险、较高的测试成本和测量的不确定性。在这种情况下,开发小剂量、高精度的新型检测技术迫在眉睫。最近,Wang和Liu等人提出了一种用于炸药表征的微区爆炸模拟器。根据他们的工作,激光诱发微爆炸是由微克级炸药在脉冲激光的刺激下产生的,已被证明与宏观爆轰密切相关。因此,它可以作为炸药表征的微区爆炸模拟器。这封信的目的是阐明爆轰性能和灵敏度的确定,并强调实验、统计和理论工作密切结合的重要性。
{"title":"Laser-induced Micro-explosion: A Micro-zone Explosive Simulator for the Characterization of Explosives","authors":"Xianshuang Wang, Ruibin Liu","doi":"10.5185/amlett.2023.031726","DOIUrl":"https://doi.org/10.5185/amlett.2023.031726","url":null,"abstract":"The determination of detonation performance and sensitivity is an important research content of explosive testing technology. However, the traditional test method usually requires a large amount of samples due to the limitation of the critical diameter and other detonation conditions. Therefore, it will inevitably bring great test risk, high test cost and measurement uncertainty. In this case, it is urgent to develop new testing technology with small dosage and high precision. Recently, a micro-zone explosive simulator for the characterization of explosives is proposed by Wang and Liu et.al. According to their work, laserinduced micro-explosion is produced by micrograms of explosives irritated by pulsed laser, has been proved to be closely related to macroscopic detonation. Therefore, it can be used as a micro-zone explosive simulator for the characterization of explosives. The aim of this letter is to shed new light on the determination of detonation performance and sensitivity and highlighted the importance of close integration of experimental, statistical, and theoretical efforts.","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74750440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Advanced Materials Letters
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