Academic literature on the topic 'Zirconium surface reactions'

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Journal articles on the topic "Zirconium surface reactions"

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Parmeter, John E., David C. Smith, and Matt D. Healy. "Surface reactions of tetraneopentyl zirconium on zirconium carbide thin films." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 12, no. 4 (1994): 2107–13. http://dx.doi.org/10.1116/1.579145.

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Jung, T. H., and R. V. Subramanian. "Alkali resistance enhancement of basalt fibers by hydrated zirconia films formed by the sol-gel process." Journal of Materials Research 9, no. 4 (1994): 1006–13. http://dx.doi.org/10.1557/jmr.1994.1006.

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Basalt fibers were dip-coated in zirconium-n-propoxide, unstabilized or stabilized by chelation with ethyl acetoacetate. The thermal transformations of the hydrated zirconia coatings formed were investigated by dynamic x-ray diffraction and differential thermal analysis. The changes in the surface chemical compositions of coated and uncoated fibers, following alkali immersion extending to 90 days, were characterized by EDXA and IR spectral analysis. Fiber strengths were also measured after immersion in 0.1 M NaOH for different durations. It was found that the transition of the amorphous zircon
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Kröger-Laukkanen, Minna, Marko Peussa, Markku Leskelä, and Lauri Niinistö. "Reactions of bis(cyclopentadienyl)zirconium dichloride with porous silica surface." Applied Surface Science 183, no. 3-4 (2001): 290–300. http://dx.doi.org/10.1016/s0169-4332(01)00573-6.

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Ziębowicz, Anna, Agata Sambok-Kiełbowicz, Witold Walke, et al. "Evaluation of Bacterial Adhesion to the ZrO2 Atomic Layer Deposited on the Surface of Cobalt-Chromium Dental Alloy Produced by DMLS Method." Materials 14, no. 5 (2021): 1079. http://dx.doi.org/10.3390/ma14051079.

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The main purpose of the research was to analyze the influence of surface modification of the cobalt-based alloy used in dental prosthetics by applying zirconium oxide (ZrO2) layers using the ALD (Atomic Layer Deposition) method. The samples were made using the DMLS (Direct Metal Laser Sintering) technique, and their surfaces were prepared in accordance with the principles of removable partial dentures (RPDs). A 50 nm-thick zirconium oxide coating was applied to the prepared substrates. This paper deals with the issues of prosthetic stomatopathy, which is a complex of pathological changes occur
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Suzuki, Noriyuki, Denis Y. Kondakov, and Tamotsu Takahashi. "Zirconium-catalyzed highly regioselective carbon-carbon bond formation reactions." Journal of the American Chemical Society 115, no. 18 (1993): 8485–86. http://dx.doi.org/10.1021/ja00071a083.

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Kohli, P., and G. J. Blanchard. "Probing Interfaces and Surface Reactions of Zirconium Phosphate/Phosphonate Multilayers Using31P NMR Spectrometry." Langmuir 16, no. 2 (2000): 695–701. http://dx.doi.org/10.1021/la990668v.

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Roustila, A., A. Rabehi, M. Souici, and J. Chene. "XPS and AES Study of Oxygen Interaction on the Surface of the ZrNi Intermetallic Compound." Advanced Materials Research 445 (January 2012): 709–13. http://dx.doi.org/10.4028/www.scientific.net/amr.445.709.

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ZrNi intermetallic compound is used in several application fields due to its very favorable characteristics for the storage of hydrogen. The hydrogen reactions are important, it is vital to examine the evolution of physico-chemical properties at the surface. X-ray photoelectron spectroscopy, is used to follow the evolution of electronic properties of ZrNi versus the ion sputtering in ultra high vacuum in the range 300-600°C. Morever, the evolution of species concentrations at the surface of ZrNi in the range 100-700°C is followed by means of Auger electron spectroscopy. The present results sho
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Saruhashi, Kowichiro, and Shū Kobayashi. "Remarkably Stable Chiral Zirconium Complexes for Asymmetric Mannich-Type Reactions." Journal of the American Chemical Society 128, no. 34 (2006): 11232–35. http://dx.doi.org/10.1021/ja062776r.

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Martiz, Alejandro, Zoltán Károly, Eszter Bódis, et al. "In-flight Synthesis of Nanosized ZrC Particles from Various Precursors in RF Thermal Plasma." Periodica Polytechnica Chemical Engineering 65, no. 3 (2021): 331–42. http://dx.doi.org/10.3311/ppch.16574.

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Synthesis of zirconium carbide (ZrC) powder was investigated applying a non-conventional atmospheric radiofrequency (RF) thermal plasma process. In one case, zirconium dioxide (ZrO2) was reacted with solid carbon or with methane with varying molar ratio. In the other, zirconium-propoxide (NZP), containing both constituents, was thermally decomposed in the Ar plasma.
 Temperature-dependent thermodynamic analysis was performed in the 500-5500 K temperature range to estimate the formation of possible equilibrium products for each reaction stoichiometry. Broad temperature range exists for the
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Knight, Kyle S., and Robert M. Waymouth. "Zirconium-catalyzed diene and alkyl-alkene coupling reactions with magnesium reagents." Journal of the American Chemical Society 113, no. 16 (1991): 6268–70. http://dx.doi.org/10.1021/ja00016a052.

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Book chapters on the topic "Zirconium surface reactions"

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Rangel, Maria do Carmo, Amalia Luz Costa Pereira, Gustavo Marchetti, Peterson Santos Querino, and Alberto Albornoz. "Case Study." In Advanced Solid Catalysts for Renewable Energy Production. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3903-2.ch008.

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The effect of zirconium on the textural and catalytic properties of magnetite for the water gas shift reaction (WGSR) at high temperatures was studied in this chapter. The reaction is an important step in the industrial production of pure hydrogen. Samples with different amounts of zirconium (Zr/Fe (molar)= 0.1; 0.2;0.3; 0.4 and 0.5) were prepared from the decomposition of iron(III)hydroxoacetate doped with zirconium. It was found that zirconium increased the specific surface area of magnetite acting as spacer on the surface where it keeps the particles apart. Except for the zirconium-poorest solid, tetragonal zirconia was detected besides magnetite for all solids. Zirconium increased the intrinsic activity of the catalysts, stabilized the specific surface areas during reaction, and made the magnetite reduction to metallic iron more difficult. The zirconium-poorest is more active than magnetite and more resistant against deactivation by sintering and overreduction being attractive for WGSR.
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Gontier, S., and A. Tuel. "Zirconium containing mesoporous silicas: New catalysts for oxidation reactions in the liquid phase." In Studies in Surface Science and Catalysis. Elsevier, 1997. http://dx.doi.org/10.1016/s0167-2991(97)80743-4.

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Choplin, A., B. Coutant, C. Dubuisson, et al. "Heterogeneous catalysts from organometallic precursors: how to design isolated, stable and active sites. Applications to zirconium catalyzed organic reactions." In Studies in Surface Science and Catalysis. Elsevier, 1997. http://dx.doi.org/10.1016/s0167-2991(97)80924-x.

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Wang, Zhi, and Zhanjun Wu. "Fabrication, Microstructure, and Properties of Zirconium Diboride Matrix Ceramic." In MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4066-5.ch012.

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The crystal structure, synthesis, and densification of zirconium diboride (ZrB2) are summarized in detail. In this chapter, ZrB2-ZrC-SiC ceramic was synthesized by reactive hot pressing a mixture of Zr, B4C, and Si powders. The thermal shock resistance of the ZrB2-SiC-ZrC ceramic was estimated by the water-quenching method and was significantly greater than that of a ZrB2-15vol.% SiC ceramic. The isothermal oxidation of the ZrB2-SiC-ZrC ceramic was carried out in static air at constant temperatures of 1000±15, 1200±15, and 1400±15 ºC for different amounts of time at each temperature. The mechanism of strength increase for the oxidized specimen indicated that the strength increased with the reaction rate, which was related to the rate of change in volume induced by reaction, initial crack geometry, elastic modulus, and surface free energy. The formation of oxide layers resulted in (I) repair of surface flaws, (II) increase in flexural strength, (III) appearance of a compressive stress zone beneath the surface oxide layers, (IV) decrease in thermal stress, and (V) consumption of thermal stress. These five aspects were favorable to the improvement of the thermal shock resistance of the ZrB2-SiC-ZrC ceramic. The isothermal oxidation of the ZrB2-SiC-ZrC ceramic was carried out in static air at 1600±15 ºC. In the different oxidation stages, quantitative models were proposed for predicting oxidation kinetics.
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Wang, T., Y. J. Ding, J. M. Xiong, et al. "Fischer-Tropsch reaction over cobalt catalysts supported on zirconia-modified activated carbon." In Studies in Surface Science and Catalysis. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)80076-4.

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Baiker, A., M. Kilo, M. Maciejewski, S. Menzi, and A. Wokaun. "Hydrogenation of CO2 Over Copper, Silver and Gold/Zirconia Catalysts: Comparative Study of Catalyst Properties and Reaction Pathways." In Studies in Surface Science and Catalysis. Elsevier, 1993. http://dx.doi.org/10.1016/s0167-2991(08)64449-3.

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Conference papers on the topic "Zirconium surface reactions"

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Tang, Changbing, Yongjun Jiao, Wenjie Li, Tao Qing, Yifei Miao, and Ping Chen. "Numerical Simulation of Different Sizes Missing Pellet Surface Effects on Thermal-Mechanical Behaviors in Nuclear Fuel Rods." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60116.

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Nuclear fuel rods is mainly composed of uranium dioxide pellets and zirconium alloy cladding, there is a gap between pellets and cladding, which is filled with helium. Under the reactor operation conditions, pellets produce a lot of heat by nuclear fission reactions and at the same time also produce lots of radioactive fission products. Cladding serve as the first barrier to accommodate radioactive fission product, needs to maintain its structural integrity under the reactor operation conditions. Cladding stresses can be effectively limited by controlling power increase rates. However, pellet
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Suckling, Paul, Nicola Calder, Paul Humphreys, Fraser King, and Helen Leung. "The Development and Use of T2GGM: A Gas Modelling Code for the Postclosure Safety Assessment of OPG’s Proposed L&ILW Deep Geologic Repository, Canada." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16291.

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As part of the postclosure safety assessment of Ontario Power Generation’s (OPG’s) proposed Deep Geologic Repository (DGR) for Low and Intermediate Level Waste (L&ILW) at the Bruce site, Ontario, a Gas Generation Model (GGM) has been developed and used to model the detailed generation of gas within the DGR due to corrosion and microbial degradation of the organics and metals present. The GGM is based on a kinetic description of the various microbial and corrosion processes that lead to the generation and consumption of various gases. It takes into account the mass-balance equations for eac
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John, Joseph, and Sajith Vandana. "Experimental Investigation on the Effect of Zirconium on Corrosion Resistance of Ceria Nanoparticles." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52433.

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Corrosion is the gradual deterioration of materials by chemical reaction with their environment, leading to the formation of less desirable material, which lacks in functionalities of the system. Corrosion resistant coatings have being an active subject of research since a while. Aiming at the replacement of toxic anti-corrosion pigments in organic coating industries, in the last two decades several environmentally friendly pigments have been studied, which involves passivating compounds such as molybdates, permanganates, vanadates, and tungstates. Cerium compounds are attaining more attention
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Al-Raqom, F., J. F. Klausner, D. Hahn, J. Petrasch, and S. A. Sherif. "High Temperature Fluidized Bed Reactor Kinetics With Sintering Inhibitors for Iron Oxidation." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62808.

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High purity hydrogen is produced through a thermochemical water splitting process that utilizes iron reduction-oxidation (redox) reactions. An iron powder bed is fluidized to improve heat and mass transfer thus improving the reaction kinetics. Inert additives which act as sintering inhibitors, such as silica (SiO2) and zirconia (ZrO2), are added to the iron powder, and their effectiveness in inhibiting sintering in the oxidation step is evaluated. The influence of particle size, composition, mass fraction and bed temperature on reaction kinetics is investigated. Incorporation of zirconia in th
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Venstrom, Luke J., Nicholas Petkovich, Stephen Rudisill, Andreas Stein, and Jane H. Davidson. "The Oxidation of Macroporous Cerium and Cerium-Zirconium Oxide for the Solar Thermochemical Production of Fuels." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54160.

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The H2 and CO productivity and reactivity of three-dimensionally ordered macroporous (3DOM) cerium and cerium-zirconium oxide upon H2O and CO2 oxidation at 1073K is presented in comparison to the productivity and reactivity of non-ordered porous and low porosity cerium oxide. The production of H2 and CO2 constitutes the second step of the two-step solar thermochemical H2O and CO2 splitting cycles. The 3DOM cerium oxide, with a specific surface area of 25 m2 g−1, increases the average H2 and CO production rates over the non-ordered porous cerium oxide with a specific surface area of 112 m2 g−1:
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Huang, Hong, Tim Holme, and Fritz B. Prinz. "Increased Cathodic Kinetics in IT-SOFCs by Inserting Highly-Conductive Nanocrystalline Materials." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65123.

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One of the crucial factors for improving intermediate-temperature SOFC performance relies on reduction of the activation loss originating from limited electrode reaction kinetics. We investigated the properties and functions of nanocrystalline interlayer via quantum simulation (QS) and electrochemical impedance analyses. Electrode impedances were found to decrease several-fold as a result of introducing a nanocrystalline interlayer and this positive impact was the most significant when the interlayer was a highly ionic-conductive nanocrystalline material. Both exchange current density and maxi
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Qin, Zhou, Li Jiwei, Dang Yu, and Ding Yang. "Research on Nickel-Plated Hydrogen-Absorption Device in Fuel Rod and Performance Testing." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67112.

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The hydrogen may be introduced into the fuel rod during the process of production and manufacture. During the operation in reactor, the irradiated fuel pellets also produce radioactive isotopes of hydrogen and tritium. Under the operating condition in pile, the hydrogen in fuel rod will enter the zirconium alloy cladding tube forming hydride, lead to the hydrogen brittleness of cladding tube, and severe cases can lead to the cladding tube broken. The radioactive tritium inside fuel rod has high activity, and it possibly goes through the cladding tube by diffusion penetration into the reactor c
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Shi, Yixiang, Won Yong Lee, and Ahmed F. Ghoniem. "Elementary Reaction Models for CO Electrochemical Oxidation on an Ni/YSZ Patterned Anode." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33205.

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Analysis of recent experimental impedance spectra and polarization curves of nickel/yttria-stabilized zirconia (Ni/YSZ) patterned anode of a solid oxide fuel cell (SOFC) are used to determine the limiting steps in CO electrochemical oxidation kinetics. A comprehensive 1D model is proposed for the prediction of the steady-state polarization curve of a patterned anode SOFC. The model incorporates gas species adsorption/desorption with surface diffusion and one of two possible charge transfer reaction steps: O charge transfer reaction [O2−(YSZ)+(Ni)+↔(YSZ)+O(Ni)+2e−], or CO charge transfer reacti
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Izzo, John R., Kyle N. Grew, and Wilson K. S. Chiu. "Effect of Excess Moisture on an Oxygen Reduction Reaction Mechanism in the Yttria Stabilized Zirconia and Strontium-Doped Lanthanum Manganite SOFC Composite Cathode." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85124.

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Air-Independent solid oxide fuel cell (SOFC) systems are primarily used in naval applications. In this study a decomposed hydrogen peroxide (H2O2) stream is used as the oxidant. The fully decomposed diluted H2O2 oxidant stream contains 20% O2 and 80% H2O, and this water content is the basis for the studies performed. A computational model has been developed that couples local gas and charge transport with a detailed oxygen reduction mechanism and considers surface coverages in the presence of excess moisture. The model is used to study the detailed reaction mechanism and the performance of the
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Mohan, Prabhakar, Travis Patterson, and Yongho Sohn. "Electrophoretic Deposition of Environmental Barrier Overlay Coatings for Yttria-Stabilized Zirconia Thermal Barrier Coatings." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59839.

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Thermal barrier coatings (TBCs) are increasingly susceptible to environmental degradation due to molten deposits of fuel impurities and air ingested sand. At elevated temperature, these deposits adhere, melt and degrade the TBCs via repeated freeze-thaw action and, to a certain extent, direct chemical reaction with TBC constituents. In order to protect TBCs from such melt ingression, a thin, dense and continuous environmental barrier overlay coating can be applied on the surface of TBCs. In this study, dense, continuous and crack-free overlay coatings of YSZ, Al2O3 and MgO were fabricated by e
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