Relevant bibliographies by topics / Cu based ZrO2

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Academic literature on the topic 'Cu based ZrO2'

Author: Grafiati
Published: 5 June 2025
Last updated: 24 June 2025

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Journal articles on the topic "Cu based ZrO2"

1

Volochko, A. T., V. A. Zelenin, E. O. Narushko, A. V. Skilandz, and G. V. Markov. "MODEL OF TRANSMISSION OF MULTILAYER COATINGS BASED ON THE Cu-ZrO2 SYSTEM IN THE OPTICAL WAVELENGTH RANGE." Doklady BGUIR, no. 6 (October 3, 2019): 87–94. http://dx.doi.org/10.35596/1729-7648-2019-124-6-87-94.

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The transmission model for optical diapason was developed for multilayer coatings consisting of alternating layers of copper and zirconium dioxide deposited on K8 glass substrates. The model is based on the laws of light interference. It was shown that the transmission in the optical range of a 60 nm thick Cu layer with a surface resistance ρ = 1 Ohm/sq is 4–5 %, and the transmission of the ZrO2/Cu/ZrO2/Cu/К8 coating obtained by dividing a 60 nm thick copper layer into two sublayers at 30 nm with the application of antireflection layers of ZrO2 on them, at ρ = 1.2 Ohm/sq it reaches 25 %. The thicknesses and the number of layers of the Cu-ZrO2 system were calculated, which ensure a transmission in the wavelength range of 400–700 nm of at least 45 %. The permissible thickness of Cu layers (≥ 20 nm) was determined, below which, due to their insular structure and partial oxidation with the formation of Cu2O, the electrical conductivity of the multilayer coating sharply decreases (ρ ≥ 100 Ohm/sq).
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Yotkeaw, Thanyaporn, Nattaya Tosangthum, Rungtip Krataitong, Monnapas Morakotjinda, Jirapat Prapai, and Ruangdaj Tongsri. "Sintered Frictional Materials Based on Cu Powders." Advanced Materials Research 747 (August 2013): 55–58. http://dx.doi.org/10.4028/www.scientific.net/amr.747.55.

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Sintered frictional materials (SFMs) were fabricated by using powder metallurgical process. Powder formulations were experimented to investigate effects of Sn, C and ZrO2 additions on mechanical and tribological properties of the sintered composites made for dry frictional materials applications. The developed SFMs consisted of non-lead friction material. Natural sand (SiO2) and ZrO2 were employed instead of lead oxide to provide frictional components. Interrelationships between chemical composition, sintering temperature, friction coefficient, wear behavior and mechanical property of the SFMs have been studied. It was found that sintering temperature affected hardness property of the SFMs. The hardness was also affected by SFM compositions. Friction coefficient increased with increasing ZrO2 content. Addition of natural sand resulted in decrease of the hardness of the SFMs. Graphite also affected hardness and friction coefficient of SFMs containing no sand. Employing prealloyed Cu-Sn powders provided SFMs with better mechanical properties compared to the SFMs made of admixed Cu and Sn powders.
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Szummer, A., M. Janik-Czachor, P. Mack, and M. Pisarek. "Electron Probe and Auger Electron Microprobe Characterization of Modified Cu-Based Amorphous Alloys." Microscopy and Microanalysis 9, no. 4 (2003): 359–67. http://dx.doi.org/10.1017/s1431927603030290.

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Changes in morphology and local chemical composition due to various methods of modification of surfaces of Cu-Zr, Cu-Hf, and Cu-Ti amorphous alloys (caused by aging in air/dry corrosion or hydrogen charging) were investigated. These modification/activation procedures transform the original amorphous ribbons of low surface area into efficient and stable catalysts, due to the segregation of a distinct amount of Cu and the development of a large specific surface area of Cu on a ZrOx or HfOx support. It was found that aging in air resulted in the formation of a bilayer of rough copper (containing small Cu particles indispensable for catalysis) on top of a rather smooth oxide underlayer (ZrOx, HfOx). Careful examination of the cross sections of the modified Cu-based ribbons revealed that, even after prolonged aging in air, only the first few microns of the surface layer was modified. Cu-Ti alloy was stable in air and did not undergo the expected modification. Hydrogenation followed by air exposure resulted in a disintegration of the ribbons into small pieces. Each piece was covered with many small Cu clusters 0.1–0.5 μm in diameter formed on an oxide underlayer. High-energy resolution Auger spectroscopy allowed identification of the underlayers (ZrO2, HfO2, or TiOx), identification of small Cu clusters, determination of the degree of surface oxidation of them, and mapping of the surface to identify the Cu-covered and “naked” heavy metal.
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Mithun, Kumar Ghosh, Kumar Sahu Sanjay, Sahoo Debasis, and Kumar Ghorai Tanmay. "Green synthesis, characterization and photocatalytic study of Cu based ZrO2 nanoparticles." Journal of Indian Chemical Society Vol. 97, No. 9b, Sept 2020 (2020): 1507–13. https://doi.org/10.5281/zenodo.5657009.

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Nanomaterials and Crystal Design Laboratory, Department of Chemistry, Indira Gandhi National Tribal University, Amarkantak-484 887, Madhya Pradesh, India <em>E-mail:</em> tanmay.ghorai@igntu.ac.in/tanmayghorai66@gmail.com <em>Manuscript received online 02 July 2020, accepted 29 August 2020</em> Green synthesis has been adopted for the synthesis of Cu based ZrO<sub>2</sub> nanoparticles via the co-precipitation method. Differ&shy;ent mole percentage of copper was incorporated in zirconia and prepare various Cu<sub>2x</sub>Zr<sub>1-x</sub>O<sub>2</sub> (x = 0.05, 0.1, 0.2, 0.3, 0.4) nanoparticles. Among all the compositions Cu<sub>2x</sub>Zr<sub>1-x</sub>O<sub>2</sub> (x = 0.05) (CZ) exhibits higher photocatalytic activity compare to pure ZrO<sub>2</sub> and other compositions for degradation of naphthyl orange (NO) under visible light in the aqueous medium. Most inter&shy;esting that the mol% of Cu<sup>2+</sup> ion in the mother composition is increased, the degradation rate of NO is decreased but CZ takes only 45 min to decolourize NO completely. The comparative study was also investigated in various model dyes like methyl orange (MO), methyl red (MR), rhodamine B (RhB) including NO in presence of catalysts and oxidation of NO spectra was recorded at constant time interval. CZ nanoparticles were characterized by a host of different techniques such as X-ray dif&shy;fraction, FTIR, SEM and UV-Visible spectroscopy. The phase structure of Cu<sub>2x</sub>Zr<sub>1-x</sub>O<sub>2</sub> was cubic and crystallite sizes was found to be 17&plusmn;1 nm, which was also compatibility from grain sizes of nanoparticles 20&plusmn;1 nm (SEM analysis). The band gap of Cu<sub>2x</sub>Zr<sub>1-x</sub>O<sub>2</sub> is 5.03 eV calculated from the optical measurement.
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Liu, Y., J. Hu, Y. Zhang, and Z. Guo. "Interface microstructure of the brazed zirconia and Ti-6Al-4V using Ti-based amorphous filler." Science of Sintering 45, no. 3 (2013): 313–21. http://dx.doi.org/10.2298/sos1303313l.

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The polycrystalline ZrO2?3mol.%Y2O3 was brazed to Ti-6Al-4V using a Ti47Zr28Cu14Ni11 (at.%) amorphous ribbon at 1123 K in a high vacuum. The microstructure of the interface and evolution mechanism of the joint was investigated. The experimental result showed that the typical interfacial microstructures of the joints consisted of ZrO2/TiO+TiO2+Cu2Ti4O+Ni2Ti4O/?-Ti+(Ti,Zr)2(Cu,Ni) eutectic/(Ti,Zr)2(Cu,Ni)/acicular Widmanst?ten structure/Ti-6Al-4V alloy. The microstructure of the brazed joint was related to the solution and chemical reaction among atoms during brazing. According to the mechanical property tests the joint brazed at 1123 K for 30 min obtained the maximum shear strength 63 MPa. Both the white block intermetallic compound (Ti,Zr)2(Cu,Ni) and the coarse ?-Ti+(Ti,Zr)2(Cu,Ni) eutectic structure should be avoided forming in the brazed joint.
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Din, Israf Ud, Maizatul Shima Shaharun, Duvvuri Subbarao, and A. Naeem. "Synthesis, Characterization and Activity Pattern of Carbon Nanofibres Based Cu-ZrO2 Catalyst in the Hydrogenation of Carbon Dioxide to Methanol." Advanced Materials Research 925 (April 2014): 349–53. http://dx.doi.org/10.4028/www.scientific.net/amr.925.349.

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Carbon nanofibers based Cu-ZrO2 catalysts (Cu-ZrO2/CNF) were synthesized by deposition precipitation method. Carbon nanofibers of herringbone type were used as a catalyst support. Before using as catalyst support, carbon nanofibers were oxidized to (CNF-O) with 10 % (v/v) nitric acid solution. A series of catalyst with various copper loadings of 10, 15 and 20 wt% were synthesized. X-ray diffraction (XRD) study revealed that degree of crystallization of catalyst increase with increasing the concentration of copper content in the catalyst. BET studies showed higher surface area for low loading of copper. Temperature-Programmed Reduction (TPR) analyses concluded good interaction of catalyst particles with higher loading of copper. The performance of Cu-ZrO2/CNF catalysts in hydrogenation of CO2 reaction was studied in slurry-typed reactor at 443 K, 30 bar and H2: CO2 ratio of 3:1. The highest yield of methanol was achieved using the 20 wt% copper loading.
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Hussain, Sajid, Eleonora Aneggi, Daniele Goi, and Alessandro Trovarelli. "Bimetallic Cu/Fe Catalysts for Ibuprofen Mineralization." Catalysts 11, no. 11 (2021): 1383. http://dx.doi.org/10.3390/catal11111383.

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At present, the use of conventional wastewater processes is becoming increasingly challenging, mainly due to the presence of biorecalcitrant organic matter. Advanced oxidation processes such as Fenton, Fenton-like and hybrid processes have been successfully employed for the treatment of highly concentrated and toxic non-biodegradable pollutants. Here, a series of bimetallic catalysts, based on Cu/Fe supported over ZrO2, were investigated for the mineralization of ibuprofen with a heterogeneous Fenton-like reaction. The materials were prepared by incipient wetness impregnation and characterized by standard techniques. Temperature-programmed experiments highlighted the promotion of the reduction in CuO due to the synergistic effects of the coupled redox cycles of copper (Cu2+/Cu+) and iron (Fe+3/Fe+2). 5%Cu-5%Fe/ZrO2 not only displays the highest ibuprofen mineralization (83%) under optimum conditions but also exploits its activity in a wider range of pH (3–5) with extremely low metal leaching. The recycling of bimetallic catalysts reveals that only the 5%Cu-5%Fe/ZrO2 system is able to provide sustainable activity in heterogeneous Fenton process.
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Wu, Yingquan, Li Tan, Tao Zhang, et al. "Effect of Preparation Method on ZrO2-Based Catalysts Performance for Isobutanol Synthesis from Syngas." Catalysts 9, no. 9 (2019): 752. http://dx.doi.org/10.3390/catal9090752.

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Two types of amorphous ZrO2 (am-ZrO2) catalysts were prepared by different co-precipitation/reflux digestion methods (with ethylenediamine and ammonia as the precipitant respectively). Then, copper and potassium were introduced for modifying ZrO2 via an impregnation method to enhance the catalytic performance. The obtained catalysts were further characterized by means of Brunauer-Emmett-Teller surface areas (BET), X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), and In situ diffuse reflectance infrared spectroscopy (in situ DRIFTS). CO hydrogenation experiments were performed in a fixed-bed reactor for isobutanol synthesis. Great differences were observed on the distribution of alcohols over the two types of ZrO2 catalysts, which were promoted with the same content of Cu and K. The selectivity of isobutanol on K-CuZrO2 (ammonia as precipitant, A-KCZ) was three times higher than that on K-CuZrO2 (ethylenediamine as precipitant, E-KCZ). The characterization results indicated that the A-KCZ catalyst supplied more active hydroxyls (isolated hydroxyls) for anchoring and dispersing Cu. More importantly, it was found that bicarbonate species were formed, which were ascribed as important C1 species for isobutanol formation on the A-KCZ catalyst surface. These C1 intermediates had relatively stronger adsorption strength than those adsorbed on the E-KCZ catalyst, indicating that the bicarbonate species on the A-KCZ catalyst had a longer residence time for further carbon chain growth. Therefore, the selectivity of isobutanol was greatly enhanced. These findings would extend the horizontal of direct alcohols synthesis from syngas.
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9

Németh, Dóra, and Margit Eniszné Bódogh. "Thermal interactions between the Y-Ba-Cu-O based superconductors and ZrO2 substrates." Epitoanyag - Journal of Silicate Based and Composite Materials 63, no. 3-4. (2011): 48–51. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2011.8.

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Song, Mouxiao, Li Li, Xueshuang Wu, Haiqing Cai, Guiying Li, and Changwei Hu. "The Influence of the ZrO2 Crystal Phase on Cu/ZrO2-Al2O3 Catalysts in Methanol Steam Reforming." Catalysts 14, no. 8 (2024): 480. http://dx.doi.org/10.3390/catal14080480.

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Copper-based catalysts are widely used in methanol steam reforming to produce hydrogen. In this paper, the supportive effect of the crystal phase of ZrO2 on Cu-based catalysts in methanol steam reforming is discussed. Monoclinic(m-), Tetragonal(t-) and mixed ZrO2 phases were prepared, and structure–activity relationships were investigated with XRD, H2-TPR, BET, HR-TEM and XPS. It was found that the catalyst with a 81.4% monoclinic ZrO2 crystal phase exhibited the highest methanol conversion (88.5%) and the highest hydrogen production rate (104.6 μmol/gcat·s) at 275 °C as it displayed the best reducing properties and more oxygen vacancies on the catalyst surface. Oxygen vacancies can produce more Cu1+ + Cu0, which is the active species for methanol steam reforming on the catalyst surface, and therefore affect catalytic activity.
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Dissertations / Theses on the topic "Cu based ZrO2"

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Vukojević, Sascha [Verfasser]. "Copper colloids and nanoparticular Cu/ZrO2-based catalysts for methanol synthesis / von Sascha Vukojević." 2009. http://d-nb.info/999118366/34.

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Book chapters on the topic "Cu based ZrO2"

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Soloviev, Sergiy O., Pavlo I. Kyriienko, Olga V. Larina, Nataliia V. Hudzenko, Vitaly P. Boiko, and Vladimir K. Grishchenko. "Development of the new generation catalysts for the process of bioethanol conversion into 1,3-butadiene for further synthesis of reactive oligomers as the binding agents for high-energy compositions." In NEW FUNCTIONAL SUBSTANCES AND MATERIALS FOR CHEMICAL ENGINEERING. PH “Akademperiodyka”, 2021. http://dx.doi.org/10.15407/akademperiodyka.444.268.

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The influence of composition of ZnO(Cu)/MgO-SiO2 and ZnO(Cu)/ZrO2-SiO2 catalysts on their catalytic performance in the 1,3-butadiene production process from rectified ethanol and ethanol-aqueous mixtures has been studied. The ZnO/MgO-SiO2 catalyst that contains equivalent amounts of MgO and SiO2, is characterized by the highest activity and selectivity for 1,3-butadiene among ZnO/MgO-SiO2 systems, due to the optimal ratio of acid and basic surface sites. It is shown that highly active MgO-SiO2-based catalysts can be obtained by wet-kneading of magnesium oxide/hydroxide and freshly precipitated silicate material, due to which it is possible to obtain a high concentration of LAS in interface of the components. Catalysts ZnO/ZrO2-SiO2 prepared by wet-kneading of ZnO nanoparticles and ZrO2-SiO2 has shown higher activity and selectivity in the conversion of ethanol-water mixtures into 1,3-butadiene compared to those prepared by impregnation. It has been shown that the radical polymerization of the C4 fraction obtained by the catalytic conversion of ethanol/ethanol-aqueous mixtures makes it possible to obtain functionalized liquid rubbers that can be used as binders in the creation of high-energy compositions for various purposes.
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Iriondo, A., M. B. Guemez, J. Requies, et al. "Butyraldehyde production by butanol oxidation over Ru and Cu catalysts supported on ZrO2, TiO2 and CeO2." In Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium, Louvain-la-Neuve, Belgium, July 11-15, 2010. Elsevier, 2010. http://dx.doi.org/10.1016/s0167-2991(10)75083-7.

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Aissat, Aissa, Stéphane Siffert, and Dominique Courcot. "Preparation of Alkali-M/ZrO2 (M = Co or Cu) for VOCs oxidation in the presence of NOx or carbonaceous particles." In Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium, Louvain-la-Neuve, Belgium, July 11-15, 2010. Elsevier, 2010. http://dx.doi.org/10.1016/s0167-2991(10)75151-x.

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Conference papers on the topic "Cu based ZrO2"

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Long, Shi-Bing, Qi Liu, Hang-Bing Lv, et al. "Resistive switching mechanism of Cu doped ZrO2-based RRAM." In 2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT). IEEE, 2010. http://dx.doi.org/10.1109/icsict.2010.5667589.

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Nai, S. M. L., J. Wei, and M. Gupta. "Effect of Nano-Size Oxide Based Reinforcement on the Tensile Properties of Sn-Ag-Cu Solder." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66904.

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In the present study, using powder metallurgy route, varying volume fraction of ZrO2 stabilized with 8 mol.% of Y2O3 particulates were incorporated into Sn-3.5Ag-0.7Cu solder to develop nanocomposite solders. The samples were extruded and characterized in terms of microstructural and tensile properties. With the addition of nano length scale reinforcement, the results revealed an improvement in 0.2% yield strength (upto ∼ 39%) and ultimate tensile strength (upto ∼ 43%), when compared with that of monolithic Sn-Ag-Cu solder. An attempt is made in this study to interrelate the tensile behavior of Sn-Ag-Cu with the presence of nano-size reinforcement.
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