Relevant bibliographies by topics / Nickel-sphere particles

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Nickel-sphere particles'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Nickel-sphere particles"

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Zhang, Yuan Guang, Hong Yu Xia, and Ying Guo Zhao. "Synthesis and Microwave-Absorbing Properties of Ni-Carbon Sphere Composites." Advanced Materials Research 399-401 (November 2011): 552–55. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.552.

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A simple solid-phase synthetic approach has been exploited for the preparation of Ni-carbon sphere composites using Ni(CH3COO)2•4H2O as nickel source, and vitamin C (L-ascorbic acid) as reductant and carbon source at 500oC for 6 h. The products were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray energy dispersive spectrometer (EDS), raman spectroscopy and microwave-absorbing measurement. The results show that the products are composed of Ni-carbon sphere particles with average diameters of 1.2 µm. Each sphere particle contains embedded Ni particles with average diameters of 83 nm. The reflection loss (RL) values of the products are lower −10 dB at 2–18 GHz, displaying broad range of microwave absorption. Their minimum RL value is about −33 dB at 4.2 GHz, which exhibit good microwave absorbing properties.
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Fahami, Abbas, Bahman Nasiri-Tabrizi, Mohsen Rostami, and Reza Ebrahimi-Kahrizsangi. "Influence of Surfactants on the Characteristics of Nickel Matrix Nanocomposite Coatings." ISRN Electrochemistry 2013 (February 3, 2013): 1–8. http://dx.doi.org/10.1155/2013/486050.

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Nickel-based nanocomposite coatings were prepared from a Watts-type electrolyte containing reinforcement’s particles (silicon carbide and graphite) to deposit onto the steel St-37 substrate. The electrochemical plating of the coatings in absence and presence of surfactants and reinforcements particles was carried out to optimize high quality coatings with appropriate mechanical and morphological features. The surfactants such as cetyltrimethylammonium bromide (CTAB), sodyumdodecyl sulfate (SDS), and saccharine affected electrodeposition plating and subsequently changed mechanical characteristics. Based on XRD results, the dominant phases in the absence of surfactants were nickel oxide (NiO), nickel, and silicon carbide (SiC), while the main phases in presence of surfactants were nickel (Ni) and SiC. The hardness of the resultant coatings was found to be from 332 to 593 (Hv) depending on the bath parameter and the reinforcements weight percentage (wt%) in the Ni matrix. Microscopic observations illustrated a cluster-like structure which consisted of some fine sphere particulates with average particle size of 65–150 nm. According to elemental mapping spectra, a homogenous distribution of nickel, silicon, and carbon particles appeared into the nickel matrix coating. Finally, the experimental outcomes demonstrated that the surfactants have significant influence on the composition of coatings, surface morphology, and mechanical properties.
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Kurniawan, Candra, Agus Tri Widodo, Dong Hyun Kim, and Dede Djuhana. "Micromagnetic Investigation of Magnetization Reversal in Sphere-Shaped Ferromagnetic Nanoparticle." Key Engineering Materials 855 (July 2020): 237–42. http://dx.doi.org/10.4028/www.scientific.net/kem.855.237.

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In this paper, the magnetization reversal of sphere-shaped ferromagnetic nanoparticles has been investigated by means of micromagnetic simulation. Some ferromagnetic particles such as Cobalt, Iron, Nickel, and Permalloy were modeled with size variation from 50 nm to 100 nm. The discretization of the ferromagnetic model was used a cell size of 2.5×2.5×2.5 nm3 considering the exchange length (lex) of the materials. The quasi-static magnetic field was induced into the nanosphere to observe the magnetization response under time dependence. It is found that the coercivity values are decreased as the sphere size increased, which was conformed the experimental results. It is also observed that the domain structure of a single particle in remanent and ground-state condition are identical. Therefore, the specific understanding of magnetization process and domain structures in ferromagnetic nanoparticles could be an important step in the development of nanopatterned magnetic memory storage.
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Sujak, Muhammad, and Dede Djuhana. "Investigation to Localized Surface Plasmon Resonance Properties of Non-Noble Metals: Fe, Ni, and Ni80Fe20." Key Engineering Materials 855 (July 2020): 243–47. http://dx.doi.org/10.4028/www.scientific.net/kem.855.243.

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In this work, we have investigated the localized surface plasmon resonance profile of promising non-noble metals such as nickel (Ni), iron (Fe), and permalloy (Ni80Fe20) as an alternative plasmonic material. The nanoparticle formed a sphere with varying the diameter from 10 nm to 200 nm with increment 10 nm, and the medium of nanoparticles is air (1+0i). The calculation was carried out by metallic nanoparticle boundary element method package. Furthermore, our result shows that increasing diameter of particles (iron, nickel, and permalloy) would increase the efficiency of ratio scattering to absorption, and the LSPRs peak led to shift to lower energy (red-shift). The ratio of scattering to absorption indicates a strengthening of radiative damping in large particle-size which largely used in biological cell imaging. However, iron’s efficiency much lower than nickel and permalloy. For example, at the highest diameter, such 200 nm, the efficiency of iron is just over around 1.25 while nickel and permalloy well under nearly 2.0. In addition, nickel and permalloy’s LSPR happened in visible range. Our results serve a systematic understanding of the shifting spectrum pattern for prospective ferromagnetic materials
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Lin, Hong-Ming, and Thomas F. Kelly. "Solidification of alternative phases in submicron spheres of nickel-chromium." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 294–95. http://dx.doi.org/10.1017/s0424820100153440.

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Kelly et. al. have processed submicron spherical particles of iron-nickel alloys and pure elements by using electrohydrodynamic (EHD) atomization. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-5 Pa. Each droplet is a separate nucleation experiment in which the droplet diameter is readily determined. Both high cooling rates and extreme isolation of heterogeneous catalytic sites are realized in the EHD process. Thus, rapid quenching of submicron spherical particles by using EHD process in Ni-Cr alloy may provide an opportunity to produce segregation-free alternative crystal phases (ACP) with low chromium contents.In this study, Ni-10, 20 and 30 at%Cr alloys were atomized and several samples of each composition were prepared for scanning transmission electron microscopy (VG HB501 STEM) analysis. EDS spectra from about ten different sphere sizes were recorded for each sample. Table I shows the average composition and standard deviation of the EDS measurements. The results indicate that each sphere composition deviates less than two percent. The X-ray counting times of chromium peak are greater than 1000 times in each sampling.
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Gao, Xiao Rui, Li Xu Lei, Li Bian, Lian Wei Kang, Xiao Cai Meng, Wei Gu, and Qing Feng Lu. "Enhanced Electrochemical Performance of [Ni4Al(OH)10]OH by Mechanically Blending Nanometric Zinc Oxide." Advanced Materials Research 805-806 (September 2013): 1668–71. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.1668.

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Nanometric zinc oxide was prepared by the methods of precipitation and subsequent hydrothermal treatment, and used as an additive of a layered double hydroxide, [Ni4Al (OH)10]OH, to prepare the positive electrode of Nickel/metal hydride battery through mechanical blending. ZnO particles show sphere-like aggregates, and the particle size is around 100 nm in diameter. The influence on the electrochemical performance was investigated in positive electrode with different mass fraction of ZnO. The results indicate that the addition of ZnO can improve charge/discharge performances and electrochemical cyclic reversibility; also, elevate the oxygen evolution potential, decrease the double layer capacitance and the charge transfer resistance.
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MOHAIDEEN, H. MOHAMED, S. SHEIK FAREED, and B. NATARAJAN. "ROLE OF CALCINATION TEMPERATURES ON THE STRUCTURAL AND OPTICAL PROPERTIES OF NiO NANOPARTICLES." Surface Review and Letters 26, no. 08 (September 5, 2019): 1950043. http://dx.doi.org/10.1142/s0218625x19500434.

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Nickel oxide nanoparticles (NiO NPs) were synthesized through template free sol–gel method. Synthesized particles were calcined at 300∘C, 500∘C and 700∘C for 2[Formula: see text]h and further the particles were characterized for its thermal, functional, structural, morphological and optical properties. The peak broadening analysis was undertaken in order to calculate the variation in size and strain components of the particles with the calcinations temperature. The Debye–Scherer, Williamson–Hall and Size-strain plot methods were employed in peak broadening analysis and were compared with TEM results. All the NiO NPs crystallite size and lattice strain value were found to be in good agreement with all the models. The TEM analysis revealed that the calcinations at 700∘C NiO NPs have sphere like structure of less than 20[Formula: see text]nm particles size value. The strong peak observed at 360.5[Formula: see text]nm bandgap emission relates to the bandgap of 3.44[Formula: see text]eV which is because of the near band edge emission.
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Chernysheva, Daria, Ludmila Pudova, Yuri Popov, Nina Smirnova, Olga Maslova, Mathieu Allix, Aydar Rakhmatullin, Nikolay Leontyev, Andrey Nikolaev, and Igor Leontyev. "Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors." Nanomaterials 11, no. 1 (January 13, 2021): 187. http://dx.doi.org/10.3390/nano11010187.

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A series of NiO/C nanocomposites with NiO concentrations ranging from 10 to 90 wt% was synthesized using a simple and efficient two-step method based on non-isothermal decomposition of Nickel(II) bis(acetylacetonate). X-ray diffraction (XRD) measurements of these NiO/C nanocomposites demonstrate the presence of β-NiO. NiO/C nanocomposites are composed of spherical particles distributed over the carbon support surface. The average diameter of nickel oxide spheres increases with the NiO content and are estimated as 36, 50 and 205 nm for nanocomposites with 10, 50 and 80 wt% NiO concentrations, respectively. In turn, each NiO sphere contains several nickel oxide nanoparticles, whose average sizes are 7–8 nm. According to the tests performed using a three-electrode cell, specific capacitance (SC) of NiO/C nanocomposites increases from 200 to 400 F/g as the NiO content achieves a maximum of 60 wt% concentration, after which the SC decreases. The study of the NiO/C composite showing the highest SC in three- and two-electrode cells reveals that its SC remains almost unchanged while increasing the current density, and the sample demonstrates excellent cycling stability properties. Finally, NiO/C (60% NiO) composites are shown to be promising materials for charging quartz clocks with a power rating of 1.5 V (30 min).
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Yudha, Cornelius Satria, Soraya Ulfa Muzayanha, Hendri Widiyandari, Ferry Iskandar, Wahyudi Sutopo, and Agus Purwanto. "Synthesis of LiNi0.85Co0.14Al0.01O2 Cathode Material and its Performance in an NCA/Graphite Full-Battery." Energies 12, no. 10 (May 17, 2019): 1886. http://dx.doi.org/10.3390/en12101886.

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Nickel-rich cathode material, NCA (85:14:1), is successfully synthesized using two different, simple and economical batch methods, i.e., hydroxide co-precipitation (NCA-CP) and the hydroxides solid state reaction method (NCA-SS), followed by heat treatments. Based on the FTIR spectra, all precursor samples exhibit two functional groups of hydroxide and carbonate. The XRD patterns of NCA-CP and NCA-SS show a hexagonal layered structure (space group: R_3m), with no impurities detected. Based on the SEM images, the micro-sized particles exhibit a sphere-like shape with aggregates. The electrochemical performances of the samples were tested in a 18650-type full-cell battery using artificial graphite as the counter anode at the voltage range of 2.7–4.25 V. All samples have similar characteristics and electrochemical performances that are comparable to the commercial NCA battery, despite going through different synthesis routes. In conclusion, the overall results are considered good and have the potential to be adapted for commercialization.
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Zuber, Guy, Jason McDermott, Sonya Karanjia, Weiyi Zhao, Michael F. Schmid, and Eric Barklis. "Assembly of Retrovirus Capsid-Nucleocapsid Proteins in the Presence of Membranes or RNA." Journal of Virology 74, no. 16 (August 15, 2000): 7431–41. http://dx.doi.org/10.1128/jvi.74.16.7431-7441.2000.

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ABSTRACT Retrovirus Gag precursor (PrGag) proteins direct the assembly of roughly spherical immature virus particles, while after proteolytic processing events, the Gag capsid (CA) and nucleocapsid (NC) domains condense on viral RNAs to form mature retrovirus core structures. To investigate the process of retroviral morphogenesis, we examined the properties of histidine-tagged (His-tagged) Moloney murine leukemia (M-MuLV) capsid plus nucleocapsid (CANC) (His-MoCANC) proteins in vitro. The His-MoCANC proteins bound RNA, possessed nucleic acid-annealing activities, and assembled into strand, circle (or sphere), and tube forms in the presence of RNA. Image analysis of electron micrographs revealed that tubes were formed by cage-like lattices of CANC proteins surrounding at least two different types of protein-free cage holes. By virtue of a His tag association with nickel-chelating lipids, His-MoCANC proteins also assembled into planar sheets on lipid monolayers, mimicking the membrane-associated immature PrGag protein forms. Membrane-bound His-MoCANC proteins organized into two-dimensional (2D) cage-like lattices that were closely related to the tube forms, and in the presence of both nickel-chelating lipids and RNAs, 2D lattice forms appeared similar to lattices assembled in the absence of RNA. Our observations are consistent with a M-MuLV morphogenesis model in which proteolytic processing of membrane-bound Gag proteins permits CA and NC domains to rearrange from an immature spherical structure to a condensed mature form while maintaining local protein-protein contacts.
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Dissertations / Theses on the topic "Nickel-sphere particles"

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Holcman, Vladimír. "Dielektrická relaxační spektroskopie kompozitních soustav." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-233414.

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The subject of this doctoral thesis is the study of dielectric properties of a binary composite made up of a polymer matrix and metallic filler. Properties of such composites have been extensively examined in the past and they turned out to depend on temperature, frequency and in particular on filler concentration. The objective of this work was first to experimentally establish and second to describe quantitatively the effect of the size of metallic particles on the properties of the composite concerned, yet at the same filler concentration. This study was carried out on the model system ethylene-vinylacetate copolymer – nickel. The acquisition of experimental results required extensive measurements in a wide frequency and temperature interval, as well as a manufacture and preparation of a large set of samples with different concentrations and Ni filler sizes. Measurements were in part carried out at the Centre for Electronic Correlations and Magnetism, Institute of Experimental Physics V of the University of Augsburg (Germany) and, after the installation of a new cryogenic system, at the Department of Physics at FEEC, BUT Brno. Measurements were performed on a number of meters (Alpha-Analyzer of Novocontrol, HP4284A and HP4285A of Hewlett Packard and E4991A of Agilent) in the frequency range 1 Hz – 1 MHz and in the temperature interval 10 K – 300 K. The nickel concentration in systems studied varied from 0 % to 75 % and nickel particles were of a spherical shape with diameters between 35 and 115 m. The measurement results have shown that in the above frequency and temperature window just a single relaxation and a single conductivity mechanism occur. It was also proved that the frequency dependence of complex permittivity is for different Ni particle sizes at the same concentration different. These results have been quantified and a simple mathematical formula based on the Lichtenecker mixture rule has been proposed for their description. The physical origin of the effect of particle size at the same total nickel concentration is sought in different surface areas of internal interfaces between nickel and polymer in the composite
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Book chapters on the topic "Nickel-sphere particles"

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"Experimental Study of Lubricating Property at Grinding Wheel/Workpiece Interface Under NMQL Grinding." In Enhanced Heat Transfer Mechanism of Nanofluid MQL Cooling Grinding, 275–97. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1546-4.ch012.

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Nanofluid is the suspension formed by lubricating oil and nanoparticles with particles sizes of 1~100 nm, and common nanoparticles include metal nanoparticles (Cu, Ag, etc.), oxide nanoparticles (Al2O3, SiO2, ZrO2, etc.), carbides (CNT, diamond), and MoS2 nanoparticles, etc. Different nanoparticles exhibit various physicochemical properties (e.g., structure and shape), which can influence their tribological characteristics. In this work, six nanofluids, namely, MoS2, SiO2, diamond, carbon nanotubes (CNTs), Al2O3, and ZrO2, were used as minimum quantity lubrication grinding fluids to select the kind of nanoparticles with optimum lubrication performance in grinding nickel alloy GH4169. Experimental results concluded the following: 1) Nanoparticles with spherical or sphere-like molecular structure and nanofluids with high viscosity demonstrate superior lubrication performances. 2) The polishing effect of nanodiamond particles enhances their surface morphology. 3) The lubricating property of the six nanofluids is described in the following order: ZrO2 < CNTs < ND < MoS2 < SiO2 < Al2O3.
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