Bibliografias temáticas / Composite materials Cu/D

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Literatura científica selecionada sobre o tema "Composite materials Cu/D"

Autor: Grafiati

Publicado: 7 de setembro de 2024

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Artigos de revistas sobre o assunto "Composite materials Cu/D"

Wang, Qing Yun, Wei Ping Shen e Ming Liang Ma. "Mean and Instantaneous Thermal Expansion of Uncoated and Ti Coated Diamond/Copper Composite Materials". Advanced Materials Research 702 (maio de 2013): 202–6. http://dx.doi.org/10.4028/www.scientific.net/amr.702.202.

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Heat sink materials not only should have higher thermal conductivity, but also have smaller difference of thermal expansion with cooled material. diamond/copper composites were made by the powder metallurgy method. Vacuum slowly vapor deposition technique was employed to deposit a titanium film on diamond particles before mixing with Cu powder in order to improve the bonding strength between Cu and diamond particles during sintering. The thermal expansion of diamond/Cu d composite was measured in the temperature range from 50 to 600 °C. The results show that the titanium film on diamond improves the interfacial bonding and reduces the coefficient of thermal expansion (CTE) of Cu/diamond composites. The CTE of diamond/Cu composites decreases with increasing diamond volume fraction as the results of mixture rule and the intense restriction effect of diamond reinforcement on the copper matrix. The residual stresses and pores in the composites affect instantaneous thermal expansion of diamond/Cu composites.

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Sundaram, Rajyashree, Atsuko Sekiguchi, Guohai Chen, Don Futaba, Takeo Yamada, Ken Kokubo e Kenji Hata. "Influence of Carbon Nanotube Attributes on Carbon Nanotube/Cu Composite Electrical Performances". C 7, n.º 4 (15 de novembro de 2021): 78. http://dx.doi.org/10.3390/c7040078.

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Carbon nanotube (CNT)/copper composites offer promise as lightweight temperature-stable electrical conductors for future electrical and electronic devices substituting copper. However, clarifying how constituent nanotube structures influence CNT/Cu electrical performances has remained a major research challenge. Here, we investigate the correlation between the CNT/Cu electrical performances and nanotube structure by preparing and characterizing composites containing nanotubes of different structural attributes. We prepared three types of composites—single-wall (SW)-CNT/Cu wires, SW-CNT/Cu pillars, and multi-wall (MW)-CNT/Cu wires. The composites were fabricated from the corresponding CNT templates by two-step Cu electrodeposition, which retains template nanotube attributes through the fabrication process. The nanotube characteristics (diameter, G/D, alignment, etc.) in each template as well as the internal structure and electrical performances of the corresponding composites were characterized. SW-CNT/Cu wires and pillars outperformed MW-CNT/Cu wires, showing ≈ 3× higher room-temperature four-probe conductivities (as high as 30–40% Cu-conductivity). SW-CNT/Cu also showed up to 4× lower temperature coefficients of resistances i.e., more temperature-stable conductivities than MW-CNT/Cu. Our results suggest that few-walled small-diameter nanotubes can contribute to superior temperature-stable CNT/Cu conductivities. Better CNT crystallinity (high G/D), fewer nanotube ends/junctions, and nanotube alignment may be additionally beneficial. We believe that these results contribute to strategies for improving CNT/Cu performances to enable the real-world application of these materials as Cu substitutes.

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Zhang, Dan-dan, e Zai-ji Zhan. "Experimental investigation of interfaces in graphene materials/copper composites from a new perspective". RSC Advances 6, n.º 57 (2016): 52219–26. http://dx.doi.org/10.1039/c6ra07606h.

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The interface microstructure between the constituent phases in graphene/Cu composites, namely graphene plane–Cu (D_p) and graphene edges–Cu (D_e), were observed for the first time from the two directions by means of transmission electron microscopy.

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Widiatmoko, Julian, Fanghui Jia e Zhengyi Jiang. "Al-Cu Composite’s Springback in Micro Deep Drawing". Journal of Engineering and Technological Sciences 55, n.º 4 (26 de outubro de 2023): 384–92. http://dx.doi.org/10.5614/j.eng.technol.sci.2023.55.4.3.

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With the recent technological trend of miniaturization in manufacturing industries, the rise of micro forming operations such as micro deep drawing (MDD) is inevitable. On the other hand, the need of more advanced materials is essential to accommodate various applications. However, a major problem are size effects that make micro scale operations challenging. One of the most important behaviors affected by size effects is the springback phenomenon, which is the tendency of a deformed material to go back to its original shape. Springback can affect dimensional accuracy, which is very important in micro products. Thus, this paper investigated the springback behavior of Al-Cu composite in MDD operations. Micro cups were fabricated from blank sheet specimens using an MDD apparatus with variation of annealing holding time. The springback values were measured and compared to each other. The results showed that different grain sizes lead to variation in the amount of springback. However, unlike in single-element materials, the amount of springback in Al-Cu composite is not only related to the thickness to grain size (t/d) ratio. Another factor, i.e., the existence of an interfacial region between layers, alters the mechanical behavior of the composite.

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Orii, Yuta, Masaki Kobayashi, Yuki Nagai, Kohei Atsumi, Daichi Tazaki, Satoshi Ehara e Takashiro Akitsu. "Anisotropic strain and Jahn-Teller effect of chiral complexes and metal oxides". Acta Crystallographica Section A Foundations and Advances 70, a1 (5 de agosto de 2014): C179. http://dx.doi.org/10.1107/s2053273314098209.

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For about a decade, we have systematically investigated thermally-accessible lattice strain and local pseudo Jahn-Teller distortion of [CuL2]3[M(CN)6]2·4H2O (L = (1R, 2R)-cyclohexanediamine; M = Cr, Co, and Fe). In mononuclear Cu(II) complexes, (pseudo) Jahn-Teller effect plays an important role in flexible distortion of crystal structures especially Cu(II) coordination environment. Beside Jahn-Teller distortion, we have dealt with some factors for example, metal substitution as bimetallic assemblies, chirality of ligands, and H/D isotope effect to vary intermolecular interaction and crystal packing. According to the course work using variable temperature PXRD, we have found that anisotropy of crystal strain distortion did not corporate with Jahn-Teller distortion around local coordination environment because of the discrepancy of the crystallographic axes and molecular alignment. In order to elucidate the anisotropic control of lattice strain and Jahn-Teller distortion closely, we have employed transition metal oxide with orthogonal or layered structures to prepare composite materials with the chiral metal complexes for discussion of thermally-accessible PXRD changes and IR shift due to adsorption. At first, we have employed chiral one-dimensional zig-zag Cu-Cr bimetallic assemblies and their oxides prepared by burining. Based on variable temperature XRD patterns, a linear correlation (lnK = a/T + b) of K (=d(T)-d(0)/d(T)) values, where d(T) and d(0) are spacing of lattice plane (d = nλ/(2sinθ)) at T K and 0 K (extrapolated), respectively, and its deviation from ideal correlation indicates degree of anisotropic lattice distortion of the composite materials. For example, we could observe LiMnO2, typical material of lithium ion battery, was enhanced anisotropic lattice strain along the b axis or the (011) plane added by [CuL2(H2O)2](NO3)2 complexes. Which may prevent from breaking down regular crystal structures during charge-discharge of secondary battery.

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Chow, G. M., T. Ambrose, John Q. Xiao, M. E. Twigg, S. Baral, A. M. Ervin, S. B. Qadri e C. R. Feng. "Chemical precipitation and properties of nanocrystalline FeCu alloy and composite powders". Nanostructured Materials 1, n.º 5 (setembro de 1992): 361–68. http://dx.doi.org/10.1016/0965-9773(92)90086-d.

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Stando, Grzegorz Jan, Pyry-Mikko Hannula, Bogumiła Kumanek, Mari Lundström, Haitao Liu e Dawid Janas. "(Digital Presentation) Recovery of Copper from Wastewater By Electrodeposition Onto Nanocarbon Composites". ECS Meeting Abstracts MA2022-01, n.º 9 (7 de julho de 2022): 761. http://dx.doi.org/10.1149/ma2022-019761mtgabs.

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The connection of carbon nanostructures such as graphene or carbon nanotubes with other materials like metals [1] or polymers [2] is often beneficial. For example, composites consisting of copper and nanocarbon materials have improved electrical [1] and mechanical [3] properties due to the synergy effect. Unfortunately, the integration between copper and nanocarbon is not an easy task because of the “cuprophobic” nature of nanocarbon [4]. Recently, many methods have been developed to accomplish this challenge. Out of all available techniques, physical (casting, spark plasma sintering or metal spinning) and electrochemical [5] gained a considerable share of attention. In particular, electrodeposition is a commonly employed strategy to deposit copper onto nanocarbon electrodes. In this method, nanocarbon surface plays the role of working electrode, onto which copper ions are reduced, thereby creating a Cu coating on the surface. This study demonstrates the recovery of copper from industrial wastewater by thin films based on carbon nanotubes (CNTs). Such a substrate was found as an ideal surface for the electrodeposition of metallic particles. Single/multi-walled CNTs, oxidized CNTs, nitrogen-doped CNTs and graphene were combined to obtain nanocarbon-nanocarbon composite electrodes, which were then used as substrates in Cu electrodeposition [6]. To establish the coating process parameters, synthetic solution of CuSO4 was first used as a source of copper ions. Then, wastewater of complex composition was employed directly for the electrodeposition process. Besides the 40 ppm of Cu, the wastewater contained other elements like salts Fe, Mg, Al, Zn and As in much greater amounts. It was discovered that such nanocomposite materials may be an excellent substrate for electrochemical recovery of Cu also from such a problematic waste, while simultaneously giving a product of high added value. Interestingly, the product was free from other metals, and only copper was detected on the nanocarbon surface. After just 1-hour of electrodeposition at -0.1V vs. SCE, a nanocarbon-based composite evenly coated with Cu was manufactured. Thorough investigation of the microstructure, and chemical composition of the nanocomposites correlated with the properties of the Cu coated materials enabled us to deduce critical parameters needed to make the Cu coating process effective [7]. [1] C. Arnaud, F. Lecouturier, D. Mesguich, N. Ferreira, G. Chevallier, C. Estournès, A. Weibel, C. Laurent, High strength - High conductivity double-walled carbon nanotube - Copper composite wires, Carbon N. Y. 96 (2016) 212–215. doi:10.1016/j.carbon.2015.09.061. [2] S.N. Beesabathuni, J.G. Stockham, J.H. Kim, H.B. Lee, J.H. Chung, A.Q. Shen, Fabrication of conducting polyaniline microspheres using droplet microfluidics, RSC Adv. 3 (2013) 24423–24429. doi:10.1039/c3ra44808h. [3] R. Jiang, X. Zhou, Q. Fang, Z. Liu, Copper-graphene bulk composites with homogeneous graphene dispersion and enhanced mechanical properties, Mater. Sci. Eng. A. 654 (2016) 124–130. doi:10.1016/j.msea.2015.12.039. [4] D. Janas, B. Liszka, Copper matrix nanocomposites based on carbon nanotubes or graphene, Mater. Chem. Front. 2 (2018) 22–35. doi:10.1039/c7qm00316a. [5] A. Singh, T. Ram Prabhu, A.R. Sanjay, V. Koti, An Overview of Processing and Properties of CU/CNT Nano Composites, Mater. Today Proc. 4 (2017) 3872–3881. doi:10.1016/J.MATPR.2017.02.286. [6] D. Janas, M. Rdest, K.K.K. Koziol, Free-standing films from chirality-controlled carbon nanotubes, Mater. Des. 121 (2017) 119–125. doi:10.1016/j.matdes.2017.02.062. [7] G. Stando, P.-M. Hannula, B. Kumanek, M. Lundström, D. Janas, Copper recovery from industrial wastewater - Synergistic electrodeposition onto nanocarbon materials, Water Resour. Ind. 26 (2021) 100156. doi:10.1016/J.WRI.2021.100156. G.S. and P.S. would like to thank the Ministry of Science and Higher Education of Poland for financial support of research (under Diamond Grant, grant agreement 0036/DIA/201948). G.S. also would like to thank European Union for thanks for financing the costs of the conference (European Social Fund, grant nr POWR.03.05.00-00-Z305) and National Agency for Academic Exchange of Poland (under the Iwanowska program, grant agreement PPN/IWA/2019/1/00017/UO/00001) for financial support during the stay at the University of Pittsburgh in the USA. G.S. and H.L. acknowledge NSF (CBET-2028826) for partial support of this work. G. S. and D.J. acknowledge the National Agency for Academic Exchange of Poland (under the Academic International Partnerships program, grant agreement PPI/APM/2018/1/00004) for supporting training in the Aalto University. G.S, B.K. and D.J. would like to thank the National Centre for Research and Development, Poland (under the Leader program, grant agreement LIDER/0001/L-8/16/NCBR/2017).

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Zaporotskova, I. V., D. P. Radchenko, L. V. Kozitov, P. A. Zaporotskov e A. V. Popkova. "Theoretical studies of a metal composite based on a monolayer of pyrolyzed polyacrylonitrile containing paired metal atoms Cu—Co, Ni—Co, Ni—Cu, Ni—Fe and an amorphizing silicon additive". Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 23, n.º 3 (10 de novembro de 2020): 196–202. http://dx.doi.org/10.17073/1609-3577-2020-3-196-202.

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An urgent problem of radio engineering and radioelectronics nowadays is the synthesis of composite materials with preset parameters that can be used as electronics engineering materials. Of special interest are MW range wide-band electromagnetic radiation absorbers. Special attention is paid to materials on the basis of ferromagnetic metals that are capable of effectively absorbing and reflecting incident waves and having a clear nanostructure. Development of nanocapsulated metals will allow controlling the parameters of newly designed materials. This is achieved with the use of polymer matrices, e.g. pyrolyzed polyacrylonitrile (PPAN). This work is a theoretical study of a PPAN monolayer model containing pairs of transition metal atoms iron, nickel and cobalt which possess ferromagnetic properties, in Fe–Co, Ni–Co and Fe–Ni combinations, with silicon amorphizing admixture. We studied the geometrical structure of the metal composite systems which are modeled as PPAN molecular clusters the centers of which are voided of six matrix material atoms, the resultant defects (the so-called pores) being filled with pairs of the metal atoms being studied. The metal containing monolayer proved to be distorted in comparison with the initially planar PPAN monolayer. We plotted single-electron spectra of the composite nanosystems and characterized their band gaps. The presence of metal atoms reduces the band gap of a metal composite as compared with pure PPAN. We determined the charges of the metals and found electron density transfer from metal atoms to their adjacent PPAN monolayer atoms. We calculated the average bond energy of the test metal composite systems and proved them to be stable. The studies involved the use of the density functional theory (DFT) method with the B3LYP functional and the 6-31G(d) basis.

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Wang, Wen-Min, Lu Zhang, Wen-Long Wang, Jin-Yi Huang, Qian-Yuan Wu e Jerry J. Wu. "Photocatalytic Degradation of 1,4-Dioxane by Heterostructured Bi2O3/Cu-MOF Composites". Catalysts 13, n.º 8 (15 de agosto de 2023): 1211. http://dx.doi.org/10.3390/catal13081211.

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Photocatalysts exhibiting high activity for the degradation of 1,4-dioxane (1,4-D) have been a subject of intense focus due to their high toxicity and challenging degradability. Bismuth oxide (Bi2O3) is recognized as an ideal photocatalyst; however, there have been limited studies on its effectiveness in 1,4-D degradation. It is crucial to address the issue of low photocatalytic efficiency attributed to the instability and easy recombination of photogenerated electrons and holes in Bi2O3 upon photoexcitation. In this study, Cu-MOF and oxygen vacancy were utilized to improve the 1,4-D photocatalytic degradation efficiency of Bi2O3 by preparing Bi2O3, Bi2O3/Cu-MOF, Bi2O3−x, and Bi2O3−x/Cu-MOF. The results revealed that the incorporation of Cu-MOF induced a larger specific surface area, a well-developed pore structure, and a smaller particle size in Bi2O3, facilitating enhanced visible light utilization and an improved photoelectron transfer rate, leading to the highest photocatalytic activity observed in Bi2O3/Cu-MOF. In addition, oxygen vacancies were found to negatively affect the photocatalytic activity of Bi2O3, mainly due to the transformation of the β-Bi2O3 crystalline phase into α-Bi2O3 caused by oxygen vacancies. Further, the synergistic effect of MOF and oxygen vacancies did not positively affect the photocatalytic activity of Bi2O3. Therefore, the construction of heterojunctions using Cu-MOF can significantly enhance the efficiency of degradation of 1,4-D, and Bi2O3/Cu-MOF appears to be a promising photocatalyst for 1,4-D degradation. This study opens new avenues for the design and optimization of advanced photocatalytic materials with improved efficiency for the treatment of recalcitrant organic pollutants.

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Ali, Amira H., Asmaa S. Hassan, Ashour M. Ahmed, Ahmed A. Abdel-Khaliek, Sawsan Abd El Khalik, Safaa M. Abass, Mohamed Shaban, Fatimah Mohammed Alzahrani e Mohamed Rabia. "Preparation and Characterization of Nanostructured Inorganic Copper Zinc Tin Sulfide-Delafossite Nano/Micro Composite as a Novel Photodetector with High Efficiency". Photonics 9, n.º 12 (14 de dezembro de 2022): 979. http://dx.doi.org/10.3390/photonics9120979.

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A novel photodetector, based on Cu2ZnSnS4, CZTS, is deposited on Cu/CuFeO2 for wavelength and light power intensity detection. The preparation of CuFeO2 is carried out by the direct combustion of Cu foil wetted with Fe(NO3)2 solution. The preparation of CZTS is carried out using the hydrothermal method, then it is dropped on CuFeO2 using the drop casting method at 70 °C. Various analyses are used to look at the chemical, morphological, and optical aspects of the Cu/CuFeO2/CZTS, such as UV–vis, SEM, TEM, selected-area electron diffraction, and XRD, in which all characteristic peaks are confirmed for the prepared materials. The Cu/CuFeO2/CZTS thin film’s SEM image has a homogeneous morphology, with particles that are around 350 nm in size, demonstrating a significant improvement in morphology over Cu/CuFeO2/CZTS thin film. The TEM analysis verified the nanostructured morphology of Cu/CuFeO2/CZTS. From XRD analysis of Cu/CuFeO2/CZTS, the high intensity of the generated peaks indexed to hexagonal (2H) CuFeO2 and kesterite CZTS crystal structures revealed a compact highly crystal material. From optical analysis, CZTS, Cu/CuFeO2, and Cu/CuFeO2/CZTS thin films recoded band gaps of 1.49, 1.75, and 1.23 eV, respectively. According to the band gap measurements, the optical absorption of the Cu/CuFeO2/CZTS photodetector has clearly increased. The Cu/CuFeO2/CZTS as photodetector has a detectivity (D) and responsivity (R) of 1.7 × 1010 Jones and 127 mAW−1, respectively. Moreover, the external quantum efficiency (EQE) is 41.5% at 25 mW·cm−2 and 390 nm. Hence, the prepared Cu/CuFeO2/CZTS photodetector has a very high photoelectrical response, making it very promising as a broadband photodetector.

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Mais fontes

Teses / dissertações sobre o assunto "Composite materials Cu/D"

Kraiem, Nada. "Impression 3D de matériaux composites à base de diamant pour des applications de gestion thermique". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0129.

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Avec la tendance à la miniaturisation croissante des équipements électriques et à l'augmentation constante de la densité de puissance dans les dispositifs à base de semiconducteurs, la gestion efficace de la chaleur est devenue un enjeu majeur pour les chercheurs. En effet, cette évolution technologique impose des contraintes de plus en plus strictes en termes de dissipation thermique, nécessitant des solutions innovantes pour garantir une meilleure durabilité et fiabilité des composants. Dans ce contexte, l'utilisation de matériaux composites offrant une conductivité thermique élevée et un coefficient de dilatation thermique faible par rapport aux métaux purs est devenue essentielle pour résoudre les problèmes de surchauffe des composants électroniques. L'intégration de matériaux avancés tels que le diamant (D), avec ses propriétés exceptionnelles de conductivité thermique et de dureté, constitue une option privilégiée pour renforcer les matrices métalliques. Toutefois, son incorporation dans les matériaux composites nécessite la création d'une interface D-métal bien définie, à la fois pour éviter la formation de porosité et assurer un transfert efficace des propriétés thermiques. La fabrication additive de matériaux 3D par fusion laser émerge comme une solution prometteuse, non seulement pour la facilité de mise en œuvre de ces composites, mais aussi pour la création de structures complexes dédiées à la dissipation de chaleur. Ces structures jouent un rôle crucial dans l'optimisation de la surface d'échange thermique par convection avec l'air environnant, permettant ainsi une dissipation efficace de la chaleur générée par les dispositifs électroniques modernes.Dans cette étude, l`impression 3D du cuivre (Cu) a été réalisée grâce à l`ajout d`une quantité optimale d’aluminium. Cette approche a permis d'améliorer considérablement la densification de matériaux à base de cuivre, malgré les défis posés par sa forte réflectivité. Par la suite, l'investigation approfondie et l'optimisation de l`impression 3D laser de l'alliage AlSi10Mg, avant et après l'incorporation de D, ont été réalisées. Enfin, une étape cruciale de post-traitement a été optimisée consistant à polir des matériaux composites Al/D par ablation laser.Ce travail a été réalisé dans le cadre d'une collaboration internationale entre l'Université du Nebraska, Lincoln aux États-Unis d'Amérique, et l'Université de Bordeaux en France
With the trend towards miniaturization of electrical equipment and the constant increase in power density in semiconductor devices, efficient heat management has become a major concern for researchers. Indeed, this technological evolution imposes increasingly strict constraints in terms of thermal dissipation, necessitating innovative solutions to ensure better durability and reliability of components. In this context, the use of composite materials offering high thermal conductivity and low coefficient of thermal expansion compared to pure metals has become essential to address overheating issues in electronic components. The utilization of advanced materials such as diamond (D), with exceptional thermal conductivity and hardness properties, stands out as a preferred choice for reinforcing metal matrices. However, its incorporation into composite materials requires the creation of a well-defined D-metal interface, both to avoid porosity formation and to ensure efficient transfer of thermal properties. Additive manufacturing of 3D materials by laser fusion is emerging as a promising solution, not only for the ease of implementation of these composites, but also for the creation of complex structures dedicated to heat dissipation. These structures play a crucial role in optimizing the heat exchange surface by convection with the surrounding air, thus allowing efficient dissipation of heat generated by modern electronic devices.In this study, 3D printing of copper (Cu) was achieved through the addition of an optimal amount of aluminum. This approach significantly improved the densification of copper-based materials, despite the challenges posed by its high reflectivity. Subsequently, in-depth investigation and optimization of laser 3D printing of the AlSi10Mg alloy, before and after the incorporation of D, were carried out. Finally, a crucial post-processing step was optimized, consisting of polishing Al/D composite materials using laser ablation.This work was carried out as part of an international collaboration between the University of Nebraska, Lincoln in the United States of America, and the University of Bordeaux in France

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Guazzone, Federico. "Engineering of substrate surface for the synthesis of ultra-thin composite Pd and Pd-Cu membranes for H₂ separation". Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-011006-123013/.

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Kaforey, Monica L. "Solid state thermal gradient processing of Y₁Ba₂Cu₃O₇âx/Ag superconducting composite ribbons". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28038.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
Vita. Title as it appears in the Feb. 1994 MIT Graduate List: Solid state temperature gradient processing of Y₁Ba₂Cu₃O₇âx/Ag superconducting composite ribbons.
Includes bibliographical references (leaves 197-202).
by Monical L. Kaforey.
Ph.D.

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Wenger, Wolfgang. "Investigations into 3-D reinforcements for composite materials". Thesis, University of Ulster, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358671.

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Meier, Dominik [Verfasser], e Leonhard M. [Akademischer Betreuer] Reindl. "Millimeter-wave tomographic imaging of composite materials". Freiburg : Universität, 2021. http://d-nb.info/1233197053/34.

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Tilliander, Ulrika. "Synthesis of nano sized Cu and Cu-W alloy by hydrogen reduction". Licentiate thesis, KTH, Materials Science and Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-353.

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The major part of the present work, deals with the reduction kinetics of Cu₂O powder and a Cu₂O-WO₃ powder mixture by hydrogen gas, studied by ThermoGravimetric Analysis (TGA). The reduction experiments were carried out both isothermally and non-isothermally on thin powder beds over different temperature intervals. During the experiments, the reductant gas flow rate was kept just above the starvation rate for the reaction to ensure that chemical reaction was the rate-controlling step. The activation energy for the reactions was evaluated from isothermal as well as non-isothermal reduction experiments.

In the case of the reduction of Cu₂O, the impact of the stability of the copper oxide on the activation energy for hydrogen reduction under identical experimental conditions is discussed. A closer investigation of additions of Ni or NiO to Cu₂O did not have a perceptible effect on the kinetics of reduction.

In the case of the reduction of the Cu₂O-WO₃mixture, the reaction mechanism was found to be affected in the temperature range 923-973 K, which is attributed to the reaction/transformation in the starting oxide mixture. At lower temperatures, Cu₂O was found to be preferentially reduced in the early stages, followed by the reduction of the tungsten oxide. At higher temperatures, the reduction kinetics was strongly affected by the formation of a complex oxide from the starting materials. It was found that the Cu₂O-WO₃mixture underwent a reaction/transformation which could explain the observed kinetic behavior.

The composition and microstructures of both the starting material and the reaction products were analyzed by X-ray diffraction (XRD) as well as by microprobe analysis. vi Kinetic studies of reduction indicated that, the mechanism changes significantly at 923 K and the product formed had unusual properties. The structural studies performed by XRD indicated that, at 923 K, Cu dissolved in W forming a metastable solid solution, in amorphous/nanocrystalline state. The samples produced at higher as well as lower temperatures, on the other hand, showed the presence two phases, pure W and pure Cu. The SEM results were in conformity with the XRD analysis and confirmed the formation of W/Cu alloy. TEM analysis results confirmed the above observations and showed that the particle sizes was about 20 nm.

The structure of the W/Cu alloy produced in the present work was compared with those for pure copper produced from Cu2O produced by hydrogen reduction under similar conditions. It indicated that the presence of W hinders the coalescence of Cu particles and the alloy retains its nano-grain structure. The present results open up an interesting process route towards the production of intermetallic phases and composite materials under optimized conditions.

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Guazzone, Federico. "Engineering of Substrate Surface for the synthesis of Ultra-Thin Composite Pd and Pd-Cu Membranes for H2 Separation". Digital WPI, 2006. https://digitalcommons.wpi.edu/etd-dissertations/442.

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This work describes a novel technique to prepare ultra-thin composite Pd-porous metal membranes for H2 separation. This novel technique consists of the gradual smoothing of the Porous Metal (PM) support's surface with several layers of pre-activated alumina particles of different sizes. The deposition of coarse, fine and ultra-fine alumina particles resulted in the narrowing of the PM' surface pore size distribution. The excellent surface smoothness achieved after the grading of the PM 's surface support allowed for the preparation of gas tight Pd layers as thin as 5.6?m. The Pd layers were extremely uniform due to the presence of the grade layer and strongly attached to the support. Composite Pd membranes prepared on graded supports showed H2 permeance as high as 50 m3/(m2 h bar0.5) at 500ºC and ideal selectivities (H2/He) as high as 27000. Moreover, the H2 permeance and ideal selectivity were stable over 1100 hours at 500ºC in H2 atmosphere. Composite Pd-Cu membranes showed H2 permeance as high as 30 m3/(m2 h bar0.5) at 450ºC and ideal selectivities (H2/He) as high as 900. The H2 permeance and ideal selectivity of Pd-Cu membranes were stable over 500 hours at 450ºC in H2 atmosphere. The outstanding long-term H2 permeance and ideal selectivity stability of all composite Pd and Pd-Cu membranes represented a breakthrough in composite Pd membrane synthesis. The thermal stresses arising from the mismatch in the coefficient of thermal expansion between the Pd film and the support were determined by means of x-ray diffraction. The results indicated that the release of stresses began to occur at temperatures close to 400ºC. Also, the release of stresses took place with a visible sintering of Pd clusters within the thin Pd film. The stresses due to the absorption of H2 were also studied and modeled. It was estimated that the maximum compressive stress under which these composite Pd membranes were characterized was equal to 260 MPa.

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Kuttner, Christian [Verfasser]. "Macromolecular Interphases and Interfaces in Composite Materials / Christian Kuttner". München : Verlag Dr. Hut, 2014. http://d-nb.info/1063222036/34.

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Quelennec, Xavier. "Nanostructuration d'un composite Cu-Fe par déformation intense : vers un mélange forcé à l'échelle atomique". Phd thesis, Université de Rouen, 2008. http://tel.archives-ouvertes.fr/tel-00648688.

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Les techniques d'élaboration par déformation plastique intense permettent d'obtenir des matériaux nanostructurés à l'état massif. La grande quantité de défauts (dislocations, lacunes,...) peut donner lieur à des transformations de phases hors équilibre. L'objectif de ce travail à été de produire par HPT (high pressure torsion) une solution solide hors équilibre à partir du système modèle Cu-Fe et de comprendre les mécanismes physiques à l'origine de sa formation. Le matériau initial est un nanocomposite filamentaire Cu-cfc/Fe-α. Des tranches de ce composite ont été déformées par HPT pour une large gamme de taux de déformation. Le matériau obtenu a été caractérisé par DRX, spectroscopie Mössbauer, MET et sonde atomique tomographique. Les filaments de ferrite sont dans une premier temps amincis jusqu'à environ 5nm. Le mélange forcé commence alors par diffusion de Fe dans Cu-cfc pour enfin aboutir à une solution solide homogène de Fe dans Cu-cfc. A la vue des données, les dislocations et le cisaillement répété des interfaces ne peuvent pas expliquer la formation du mélange forcé. Celle-ci est attribuée à la diffusion accélérée par les lacunes en excès.

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Morgan, Margaret. "Geometric modelling of 3-D woven reinforcements in composite materials". Thesis, University of Ulster, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423442.

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Livros sobre o assunto "Composite materials Cu/D"

Wenger, Wolfgang. Investigations into 3-D reinforcements for composite materials. [s.l: The Author], 1993.

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Moore, Thomas J. Tensile strength of simulated and welded butt joints in W-Cu-composite sheet. Cleveland, Ohio: Lewis Research Center, 1994.

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Center, Langley Research, ed. Fatigue resistance of unnotched and post-impact (+ ø30ʻ́/0ʻ́) 3-D braided composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1994.

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Center, Langley Research, ed. Fatigue resistance of unnotched and post-impact (+̲30/0) 3-D braided composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1994.

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Poe, Clarence C. Mechanics of textile composites conference: Proceedings of a conference sponsored by the National Aeronautics and Space Administration, Washington, D. C., and held in Hampton, Virginia, December 6-8, 1994. Hampton, Va: Langley Research Center, 1995.

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International Meeting on Modern Ceramics Technologies (12th 2010 Montecatini Terme, Italy). Ceramics and composites in extreme environments & for chemical and electrochemical applications: 12th international ceramics congress, part D. Stafa-Zuerich: Trans Tech Pubs. ltd. on behalf of Techna Group, 2011.

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Thomas, Hahn H., ASTM Committee D-30 on High Modulus Fibers and Their Composites., ASTM Committee E-24 on Fracture Testing. e Symposium on Composite Materials: Fatigue and Fracture., eds. Composite materials: Fatigue and fracture : a symposium sponsored by ASTM Committee D-30 on High Modulus Fibers and Their Composites, Dallas, TX, 24-25 Oct. 1984. Philadelphia, PA: ASTM, 1986.

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L, Kessler Sandra, e ASTM Committee D-20 on Plastics., eds. Instrumented impact testing of plastics and composite materials: A symposium sponsored by ASTM Committee D-20 on Plastics, Houston, TX, 11-12 March 1985. Philadelphia, PA: ASTM, 1987.

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Miravete, Antonio. 3-D Textile Reinforcements In Composite Materials. CRC, 1999.

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Miravete, Antonio, ed. 3-D Textile Reinforcements In Composite Materials. CRC Press, 1999. http://dx.doi.org/10.1201/9781439823262.

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Capítulos de livros sobre o assunto "Composite materials Cu/D"

Gay, Daniel. "Quasi-Orthotropic Homogenized Laminates or D-D Laminates". In Composite Materials, 309–54. 4^a ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003195788-18.

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Shohji, Ikuo, Susumu Arai, Naoki Kano, Noboru Otomo e Masahisa Uenishi. "Development of Cu Brazing Sheet with Cu-P Composite Plating". In Key Engineering Materials, 2025–28. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.2025.

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Jiang, Guosheng, Liyong Diao e Ken Kuang. "Improved Manufacturing Process of Cu/Mo70-Cu/Cu Composite Heat Sinks for Electronic Packaging Applications". In Advanced Thermal Management Materials, 99–107. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-1963-1_7.

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Lin, Hong Ming, Giin Shan Chen e Pee Yew Lee. "Microstructure and Properties of Vacuum Hot-Pressing SiC/ Ti-Cu-Ni-Sn Bulk Metallic Glass Composites". In Composite Materials V, 26–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-451-0.26.

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Fan, Zhi Kang, e Peng Xiao. "Morphology of Chromium in Cu- 2.0%~4.2%Cr Alloys". In Advances in Composite Materials and Structures, 277–80. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.277.

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Jain, Tanvi, Hridyesh Kumar e Pradip Kumar Dutta. "D-Glucosamine and N-Acetyl D-Glucosamine: Their Potential Use as Regenerative Medicine". In Springer Series on Polymer and Composite Materials, 279–95. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2511-9_11.

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Wang, Xin Hong, Zeng Da Zou, Min Zhang, Si Li Song e Shi Yao Qu. "Bonding Strength and Microstructure of Cermet/Cu-Based Alloy Composite Brazed Coatings". In Key Engineering Materials, 154–59. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-978-4.154.

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Rajanna, T. R., Amar Singh e K. Joseph Shibu. "Qualification of 3-D Printed AlSi10Mg Part for Military Airborne Applications". In Composite Materials for Extreme Loading, 171–86. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4138-1_13.

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Xiao, Peng, e Zhi Kang Fan. "Effects of Chromium Particle on Elevated Temperature Tensile Strength of Cu-Cr Alloy". In Advances in Composite Materials and Structures, 273–76. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.273.

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Han, Guihong, Pengfei Tang, Hongyang Wu, Jun Ma, Xiaomeng Yang e Yongsheng Zhang. "Adsorption Behavior of Cu(II) to Silica-Humics Composite Aerogels". In The Minerals, Metals & Materials Series, 91–96. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05749-7_10.

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Trabalhos de conferências sobre o assunto "Composite materials Cu/D"

Sinha, Arpita, Jadran A. Mihailovic, James E. Morris, Hua Lu e Chris Bailey. "Modeling thermal conductivity and CTE for CNT-Cu composites for 3-D TSV application". In 2010 IEEE Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2010. http://dx.doi.org/10.1109/nmdc.2010.5652157.

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Sundaram, Rajyashree, Guohai Chen, Takeo Yamada, Don Futaba, Kenji Hata, Ken Kokubo e Atsuko Sekiguchi. "Lightweight Cu/Carbon Nanotube Composite Electric Conductors". In 2020 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2020. http://dx.doi.org/10.7567/ssdm.2020.k-9-03.

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Goldie, James H., Michael J. Gerver, John Oleksy, Gregory P. Carman e Terrisa A. Duenas. "Composite Terfenol-D sonar transducers". In 1999 Symposium on Smart Structures and Materials, editado por Manfred R. Wuttig. SPIE, 1999. http://dx.doi.org/10.1117/12.352797.

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Yungang Li, Limin Liu e Jie Li. "The progress of W-Cu composite materials preparation technique". In Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930584.

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Moskvichev, E. N. "Fabrication of NiAl strengthened Cu-Al based composite". In PROCEEDINGS OF THE II INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS, SYSTEMS AND TECHNOLOGIES: (CAMSTech-II 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0092748.

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Bharathi, K. Divya, M. R. Rahman, Sunita Choudhary e S. B. Arya. "Development and characterization of Cu/MWCNT composite prepared by electrodeposition technique". In ADVANCES IN MECHANICAL DESIGN, MATERIALS AND MANUFACTURE: Proceeding of the Second International Conference on Design, Materials and Manufacture (ICDEM 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0010560.

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Zhang, Yinghui, Linghui He, Haixia Tian e Kai Peng. "Influences of Carbon Nanotubes on Performance of W-Cu Composite Materials". In 2015 International Conference on Advanced Material Engineering. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814696029_0051.

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Watanabe, Naoyuki, e Yasuyo Tanzawa. "Delamination analysis of 3-D orthogonal interlocked fabric composite". In 37th Structure, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1418.

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Shi, Yu, Yi Wang, Gaoming Wang, Wei Li, Tao Yu e Chunhua Lu. "Thermal properties of nano-SiO2 optimized aluminate cementitious composite Cu powders". In 2015 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icmmcce-15.2015.476.

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Ramli, M. I. I., M. A. A. Mohd Salleh, M. M. Al Bakri Abdullah, R. M. Said, A. V. Sandu e N. Saud. "Microstructural and phase analysis of Sn-Cu-Ni-XSiC composite solder". In ADVANCED MATERIALS ENGINEERING AND TECHNOLOGY V: International Conference on Advanced Material Engineering and Technology 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4981848.

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Relatórios de organizações sobre o assunto "Composite materials Cu/D"

Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova e Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, janeiro de 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.

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