Articles de revues : « NICKEL NANO-PARTICLES »

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Thanikachalam, J., P. Nagaraj et S. Karthikeyan. « Preparation and characterization of nano magnetic fluid for automotive applications ». Archives of Materials Science and Engineering 2, n^o 96 (1 avril 2019) : 49–55. http://dx.doi.org/10.5604/01.3001.0013.2384.

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Purpose: of this paper is to prepare a nano magnetic fluids with nano additives to have the combined characteristics of high yield stress and better magnetic properties for smart vehicles. This study focuses on increasing the sedimentation time of the fluid using suitable nano additive nickel along with graphene as fillers. Design/methodology/approach: Magnetic nano sized nickel particle based electro- magneto-rheological fluid was prepared and graphene nanoparticle with thickness less than 10nm was introduced as an additive to reduce its sedimentation. This added plate like graphene acts as filler which seals the interfaces of nickel particles and thereby it improves the resistance to sedimentation. Triton X 100 was added as the surfactant for the fluid to reduce the agglomeration of the particles. Findings: Morphology of pure nickel and graphene were examined using scanning electron microscopy (SEM) images. Research limitations/implications: The important limitations is that freely dispersed micron sized iron particles could settle over a period of time, in the form of cakes at the bottommost, and it is tedious to recuperate as dispersed phase. In this investigation, nano sized nickel particles were used as additive to reduce the sedimentation of micron sized iron particles so that, the mixture is homogeneous for extended period of time. In future, addition of different types composite additives in the magnetorheological fluid could be made for the better sedimentation control. Practical implications: The sedimentation problem is one of the major drawback in the smart fluids, which can be eliminated by adding nano particles. For conventional fluid, the complete sedimentation will occur in 2 hours while the improved nano magnetic fluid with additive has good resistance to settle the micron sized iron particle up to 10 hours. Originality/value: To prepare a low cost magnetorheological fluid with nano additives like nickel particles along with fillers as graphene nano particles. With this addition of nickel and inclusion of graphene, the sedimentation problem in magnetorheological fluids is significantly reduced. This magnetorheological fluids can be used in brakes and dampers of automobiles.

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Thanikachalam, J., P. Nagaraj et S. Karthikeyan. « Preparation and characterization of nano magnetic fluid for automotive applications ». Archives of Materials Science and Engineering 2, n^o 95 (1 février 2019) : 67–73. http://dx.doi.org/10.5604/01.3001.0013.1732.

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Purpose: of this paper is to prepare a nano magnetic fluids with nano additives to have the combined characteristics of high yield stress and better magnetic properties for smart vehicles. This study focuses on increasing the sedimentation time of the fluid using suitable nano additive nickel along with graphene as fillers. Design/methodology/approach: Magnetic nano sized nickel particle based electro- magneto-rheological fluid was prepared and graphene nanoparticle with thickness less than 10nm was introduced as an additive to reduce its sedimentation. This added plate like graphene acts as filler which seals the interfaces of nickel particles and thereby it improves the resistance to sedimentation. Triton X 100 was added as the surfactant for the fluid to reduce the agglomeration of the particles. Findings: Morphology of pure nickel and graphene were examined using scanning electron microscopy (SEM) images. Research limitations/implications: The important limitations is that freely dispersed micron sized iron particles could settle over a period of time, in the form of cakes at the bottommost, and it is tedious to recuperate as dispersed phase. In this investigation, nano sized nickel particles were used as additive to reduce the sedimentation of micron sized iron particles so that, the mixture is homogeneous for extended period of time. In future, addition of different types composite additives in the magnetorheological fluid could be made for the better sedimentation control. Practical implications: The sedimentation problem is one of the major drawback in the smart fluids, which can be eliminated by adding nano particles. For conventional fluid, the complete sedimentation will occur in 2 hours while the improved nano magnetic fluid with additive has good resistance to settle the micron sized iron particle up to 10 hours. Originality/value: To prepare a low cost magnetorheological fluid with nano additives like nickel particles along with fillers as graphene nano particles. With this addition of nickel and inclusion of graphene, the sedimentation problem in magnetorheological fluids is significantly reduced. This magnetorheological fluids can be used in brakes and dampers of automobiles.

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Kim, Shin Dong, Soo Jin Park et Young Seak Lee. « Nickel Decoration on Multi-Walled Carbon Nanotubes Using Multi-Step Impregnation Method ». Solid State Phenomena 135 (février 2008) : 77–80. http://dx.doi.org/10.4028/www.scientific.net/ssp.135.77.

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In this work, nano-sized nickel particles were dispersed on multi-walled carbon nanotubes using multi-step impregnation method, to use them as hydrogen storage media. The dispersion degree of nickel particles on multi-walled carbon nanotubes is inversely proportional to the nickel concentration of solution. It was observed that the low nickel concentration is efficient to decorate nickel particles into the inner space. Multi-step impregnation method of MWNTs through several times with low nickel concentration is more efficient to manufacture Ni-MWNTs having well dispersed metallic nickel particles.

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Leela-adisorn, Uraiwan, Takuya Matsunaga, Seong Min Choi, Sawao Honda et Hideo Awaji. « Alumina-Based Nanocomposites Fabricated by a Novel Soaking Method ». Key Engineering Materials 317-318 (août 2006) : 607–10. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.607.

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Nickel dispersed alumina matrix nanocomposites were fabricated using a novel soaking method. Secondary particles were introduced into the nano-pores of a porous matrix grains by a soaking method, such that γ-alumina powder was soaked in nickel nitrate solution under vacuum. During pre-calcination, nickel oxide particles were created inside of the nano-pores of γ-alumina. The alumina powders were then reduced under hydrogen atmosphere to obtain nano-sized metallic nickel embedded in γ-alumina grains. The alumina-nickel composite powders were sintered by pulse electric current sintering (PECS) technique with α-alumina seeds. The maximum strength of the alumina-nickel nanocomposites was 984 MPa after sintering at 1,450 °C with α-alumina seeds, where the specimen size was 2210 mm3. The maximum fracture toughness was 5.5 MPa·m1/2 after sintering at 1,350 °C with seeds measured by the single edge V-notched beam (SEVNB) method.

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Haque, K. M. A., et M. S. Hussain. « Synthesis of Nano-sized Nickel Particles by a Bottom-up Approach in the Presence of an Anionic Surfactant and a Cationic Polymer ». Journal of Scientific Research 2, n^o 2 (26 avril 2010) : 313–21. http://dx.doi.org/10.3329/jsr.v2i2.3261.

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Nano-sized nickel particles have been synthesized by a bottom-up approach, using hydrazine as the reducing agent in the presence of an anionic surfactant - sodium-dodecyl sulphate (SDS). The effect of adding a nonionic polymer -polyvinylpyrrolidone (PVP) with an anionic surfactant has been studied at two different temperatures; the rate of reduction increased as the reaction temperature was increased from 60 to 100°C. These nano-aggregated nickel particles were characterized by using SEM with EDX facilities and TEM. TEM characterization showed the presence of spherical Ni particles as fine as 10nm in diameter. However, the SEM images showed a very spiky morphology, very small spherical shaped objects were clearly observed within these spiky structures. The combination of SDS/PVP reaction produced nano-sized nickel particles which were much finer than the reactions where SDS was used on its own. PVP has shown some dispersion power, and was found to be capable of preventing nickel particles from gradual agglomeration. Keywords: Bottom-up; SDS; PVP; 10 nm. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI:10.3329/jsr.v2i2.3261 J. Sci. Res. 2 (2), 313-321 (2010)

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Han, Hui, Qi Heri Ma, Li Lv et Xiao Jing Wang. « Preparation and Grain Growth Kinetic of Nickel Oxide Nano-Particles ». Materials Science Forum 694 (juillet 2011) : 133–36. http://dx.doi.org/10.4028/www.scientific.net/msf.694.133.

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Nickel oxide nano-particles were prepared successfully by thermal decomposition of the β-Ni(OH)2 in this work. The precursor β-Ni(OH)2 was obtained by the chemical precipitation reaction of Ni(NO3)2 and KOH at near room temperature. The grain growth kinetic of nano-sized nickel oxide for thermal treatment process was studied by means of isothermal and isochronal annealing. The results showed the precursor β-Ni(OH)2 is spindle alike shape, which can transform entirely into cubic NiO nano-particles when calcinated at temperature higher than 280°C. The NiO nano-particles grew up with the increasing of the calcinating temperature and the prolonging of the calcinatiing time. Moreover, we found that to tune the annealing temperature is more available for size controlling than to vary the annealing time. The grain growth kinetic of NiO nano-particles is found to follow the equation D7 = 1.946×1017•t•exp(-1.466×103/RT), where the grain growth exponent and an activation energy are n=7 and Ea=146.56KJ/mol, respectively.

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Zhang, Cun Lai, et Zhong Bao Shao. « Production of Nano NiO Particle with Chemical Precipitation Method and their Characteristics ». Applied Mechanics and Materials 217-219 (novembre 2012) : 245–51. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.245.

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Nano nickel oxide (NiO) particles were synthesized by a homogeneous precipitation method using NiCl2 as starting material and CO(NH2)2 as precipitant. Proper amount of NP-10 and appropriate organic solvent were added in the preparation process as dispersant. The chemical composition and properties were characterized by means of transmission electron microscope, X-ray diffractometer, and thermo gravimetry-differential thermal analyzer. The effects of reactant ratio, reaction temperature, reaction time, surfactant concentration, organic modifier concentration, agglomeration temperature as well as other reaction conditions on the appearances, size and dispersity degree of nano particles were investigated. The experiment results show that homogenous nano NiO particles were obtained by reacting nickel oxide and urea with a weight ration of 1:5 for 6 h at 80°C, then calcining for 2 h at 300°C. Adding surfactant NP-10 and organic solvent butanol to reaction system increases the dispersity and decreases the particle size of nano nickel oxide.

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Barkule, Ram S., D. V. Kurmude, A. V. Raut, N. N. Waghule, K. M. Jadhav et D. R. Shengule. « Structural and Electrical Conductivity Studies in Nickel Ferrite Nano-Particles ». Solid State Phenomena 209 (novembre 2013) : 177–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.209.177.

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Abstract: The magnetic nano-particles of nickel ferrite were synthesized successfully by sol-gel auto-combustion method using high purity metal nitrates and citric acid as chelating agent. The as prepared powder of nickel ferrite was sintered at 5500C for 5 hr to obtain good crystalline phase and was used for further study. The X-ray diffraction technique was employed to confirm the single phase formation of nickel ferrite nano-particles. The X-ray diffraction pattern shows the Bragg’s peak which belongs to cubic spinel structure. The values of lattice constant, X-ray density, oxygen parameter and radii of tetrahedral and octahedral sites were calculated from XRD data. The average crystallite size was estimated using Scherrer’s formula and found to be 6 nm. The temperature dependence of the electrical conductivity plot shows the kink, which can be attributed to ferromagnetic-paramagnetic transition. The activation energy obtained from resistivity plots in paramagnetic region is found to be more than that in ferrimagnetic region. The conduction mechanism in these nickel ferrite nano-particles has been discussed on the basis of hopping of electrons.

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Cihlářová, Petra, Jiří Švejcar et Vàclav Sklenička. « Microstructure and Mechanical Properties of Electrodeposited Nickel and its Particle-Reinforced Nanocomposite ». Materials Science Forum 567-568 (décembre 2007) : 205–8. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.205.

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There are two types of experimental material used – pure nickel and its nano-composite reinforced with nano-sized SiO2. These materials were produced by TU Clausthal, Germany. The results have shown that the creep resistance of the nickel nano-composite reinforced with nanosized SiO2 particles is higher in comparison with non-reinforced nickel. The mechanism responsible for creep behaviour is the dislocation creep at 293 K and at elevated temperatures the dislocation creep is controlled by grain boundary sliding.

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Yao, Y. D., Y. Y. Chen, M. F. Tai, D. H. Wang et H. M. Lin. « Magnetic anisotropy effects in nano-cluster nickel particles ». Materials Science and Engineering : A 217-218 (octobre 1996) : 281–85. http://dx.doi.org/10.1016/s0921-5093(96)10326-9.

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Wielage, Bernhard, Thomas Lampke, Manuela Zacher et Dagmar Dietrich. « Electroplated Nickel Composites with Micron- to Nano-Sized Particles ». Key Engineering Materials 384 (juin 2008) : 283–309. http://dx.doi.org/10.4028/www.scientific.net/kem.384.283.

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Electroplated nickel coatings provide ductility, excellent corrosion resistance and good wear resistance, which qualifies them to meet complex demands of engineering, microtechnology and microelectronics. The co-deposition of particles is a promising alternative to deposit layers with adequate microstructure and properties avoiding the rise of residual stress. The incorporation of the sufficient quantity of particles, monodisperse distribution and downsizing to nanometre scale affect the amount of strengthening by dispersion hardening. To avoid agglomeration in the electroplating bath as well as in the layer is a challenge which has been met by simple Watts nickel electrolyte with a minimum of organic additives and adequate bath agitation comprising sonication, i.e. the exposure of the bath to high-frequency sound waves. Well-dispersed hard particles (titanium oxide and silicon carbide) were incorporated in nickel films. The focus was set on the correlation between the gained microstructure of the composites with particles from micron to nanometre scale and the electrochemical and mechanical properties. Corrosion was quantified from polarisation curves and volumetric erosion measurements. Wear resistance was evaluated by scratch energy density studies, oscillating sliding wear testing and cavitation wear testing and compared to indentation hardness results. Sonication and particle downsizing result in matrix grain refinement and dispersion hardening. Incorporation of different particles with respect to different material and size proved to meet different demands. Submicron TiO2 is best for high corrosion resistance, sonicated nickel without particle incorporation is best for high abrasion resistance, nano TiO2 is best for oscillating sliding wear resistance and submicron SiC is best for cavitation wear resistance.

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Jiang, Dong Mei, Ying Shen, Wei Jun Zhang et Tie Jun Liu. « Deposition Mechanism and Wear Resistance Nano Ni-Al₂O₃ Composite Coatings ». Applied Mechanics and Materials 281 (janvier 2013) : 409–12. http://dx.doi.org/10.4028/www.scientific.net/amm.281.409.

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Nano Ni-Al2O3 composite coatings were prepared on pure copper substrate. The surface morphology and distribution of nano-particles of coatings were observed by SEM, the components of the coatings analyzed by X-ray diffractometer, and the microhardness of coatings tested by HXD-1000 microhardness tester. The microstructure of nano Ni-Al2O3 composite coating was different from that of the electrodeposited nickel coatings. The inserted Al2O3 particle can effectively hinder the growth of crystals. The microhardness of composite coatings around the inserted particles was much higher than that of electrodeposited nickel coatings. The more the size of Al2O3 decreased, the more the microhardness and wear resistance of the composite coatings increased.

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Li, Xue Song, Long Sheng He et You Yang. « Forming Mechanism of Composite Coating with Nano-Particles and its Wear Resistance ». Applied Mechanics and Materials 281 (janvier 2013) : 500–504. http://dx.doi.org/10.4028/www.scientific.net/amm.281.500.

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Ni-SiC nano composite coatings were prepared on pure copper substrate. The surface morphology and distribution of nanometer particles of the composite coatings were observed by scanning electron microscope (SEM), micro-hardness of coatings was tested by HXD-1000 microharder. The results showed that microstructure of Ni-SiC nano composite coating is different from that of electrodeposited nickel coatings. Its electrodepositing process abided by the principal of adsorption. By adding nanometer particles, the structure of composite coatings can be effectively fined, microhardness of composite coatings is improved apparently by comparing with that of electrodeposited nickel coatings. Abrasion resistance of Ni-SiC nano composite coatings is excellent.

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Hao, Jian Jun, Yan An Bai, Chong Rui Wang et Xin Yuan Liu. « Fabrication and Characterization of Ni-TiO₂ Nanocomposite Coatings and Their Corrosion Resistance Behaviors ». Materials Science Forum 688 (juin 2011) : 217–22. http://dx.doi.org/10.4028/www.scientific.net/msf.688.217.

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Ni-TiO2 nanocomposite coatings have been successfully fabricated via a route electrodeposition from nickel Watts bath containing nano-TiO2 particles, and characterized by scanning electron microscopy (SEM),X-ray diffraction(XRD), energy dispersive X-ray spectroscopy (EDS)and electrochemical techniques. The influence of preparation parameters on the properties of the coatings were investigated. The obtained results indicated that nano-TiO2 particles were distributed uniformly in the Ni matrix. It was found that the Ni-TiO2 nanocomposite coatings exhibited more excellent corrosion resistance and microhardness in comparison with pure nickel coating.

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Han, Zhao, et Hong Min Zhu. « A Novel Method for the Preparation of Nano-Sized Nickle Powders ». Advanced Materials Research 512-515 (mai 2012) : 1849–53. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.1849.

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Nano-sized nickel powders were prepared through a wet chemical reduction, of NiCl2 by sodium in liquid ammonia at -45 °C, and a subsequent heat-treatment in vacuum at 300 °C. The prepared product was systematically characterized by X-ray diffraction (XRD), scan electron microscopy (SEM), transmission electron microscopy (TEM), and BET specific surface area measurement. The results show that the product was composed of nano-sized nickel particles, with average particle diameter of about 20 nm, and specific surface area of about 30 m2g-1. The possible formation mechanism of the nano-sized nickel powder was also discussed briefly.

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Hong, Kyo-Min, Moon Sun Kim, Yong Chul Lee et Nam Ki Kim. « The Characteristics of Nickel-Electroplating on Copper Substrate in CO₂ Supercritical Fluid ». Journal of Metastable and Nanocrystalline Materials 23 (janvier 2005) : 247–50. http://dx.doi.org/10.4028/www.scientific.net/jmnm.23.247.

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In this work, a nickel electroplating was performed on the copper substrate using nonionic surfactant in supercritical carbon dioxide to improve the dispersion characteristics of nickel nano-particles. The electric resistance of emulsion decreased rapidly from 46 to 25 Ω with an increasing pressure from 8 MPa to 16 MPa and was nearly constant at 25 Ω over 14 MPa. The conductivity of emulsion solution was highest at nonionic surfactant concentration of 0.1 vol% and the dispersion of nickel nano-particles was better than at any other concentration. CO2 concentration was controlled under 0.5 vol% to reduce electric resistance in emulsion solution. Roughness (Ra) of copper substrate without plating was 0.084 ㎛, however, that of nickel film plated for 10 min was smoothed to 0.020 ㎛ and the surface of nickel film plated was smoothed with an increasing plating time. The plating properties of nickel in CO2 supercritical fluid showed better properties than in conventional method.

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Gu, Yuan, et John Federici. « Fabrication of a Flexible Current Collector for Lithium Ion Batteries by Inkjet Printing ». Batteries 4, n^o 3 (3 septembre 2018) : 42. http://dx.doi.org/10.3390/batteries4030042.

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A novel chemical process has been developed to formulate injectable nickel ink for conductive film. This chemical method has the ability to remove the oxidation on nickel nano-particle surfaces during ink fabrication; the nickel ions, which are produced during chemical etching, will be reduced and bridged among original nano-nickel particles in the following thermal sintering process at 350 °C. X-ray diffraction results exhibit that the final nickel film has no significant composition change by this chemical method and that oxidation has been effectively removed. Scanning electron microscopy images show that this chemical process reduces nickel oxides into nickel and that the reduced nickel sticks on the original nickel particle surface acting as a “bridge” connecting each particle. So solid diffusion can be triggered easily among bridged nickel particles and sintered at relatively low temperatures. The resistivity of printed film is to 5 × 10 − 6 Ω ∙m which is 71-times that of bulk nickel. The fabricated conductive nickel thin film has been applied on lithium ion batteries as a current collector for cathode and anode and shows good corrosion resistance and stability.

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Zhu, Chuan Gao, et Feng Wu Wang. « Preparation for Nano-NiO by Electrolysis of Nickel in HOCH₂CH₂OH Solution ». Advanced Materials Research 399-401 (novembre 2011) : 593–96. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.593.

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A method to prepare nickel oxide material which has a high purity and nano-sized particle was developed. nano NiO was synthesized by sol-gel method using nickel alkoxide as precursors. The structural characterization of the obtained materials was performed by thermal analysis TG-DTA, X-ray diffraction (XRD), Laser Raman spectra and Transmission Electron Microscopy (TEM). The characterization results indicated that NiO nano-particles (size 25–35 nm) are obtained by hydrolyzing of metal alkoxide of Ni(OCH2CH2OH)2 and possess high purity.

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Kerli, Süleyman, et Ali Kemal Soğuksu. « Production of iron oxide and nickel oxide nanostructural particles, investigation of the supercapacitor and photocatalytic properties ». Zeitschrift für Kristallographie - Crystalline Materials 234, n^o 11-12 (18 décembre 2019) : 725–31. http://dx.doi.org/10.1515/zkri-2019-0043.

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AbstractIn this study, iron oxide, nickel oxide, and nickel-iron oxide nanostructured particles were produced by the hydrothermal method. X-ray diffraction (XRD) and SEM measurements were performed to investigate the physical properties of these nanostructured particles. According to the XRD results, the crystal properties of these particles were determined. From the SEM images, these particles understood to be nano-structured. The electrodes were examined for electrochemical properties by using these nanostructured particles. Electrochemical measurements of the produced electrodes were performed, and capacitance values and impedance spectra of the electrodes were determined. The specific capacitance values of the iron oxide, nickel-iron oxide, and nickel oxide nanostructured particles, respectively are 30 F/g, 55 F/g, and 67 F/g. Also, the photocatalytic activities of nanostructured particles were investigated. This examination methylene blue (MB) was used and made under a xenon lamp. In light of our findings, it was observed that high photocatalytic degradation rate. Nickel-iron oxide nanostructured particles, the degradation of MB were found to be about 87%.

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Okuda, M., I. Yamashita et H. Yoshimura. « Fabrication of Nickel and Cobalt nano-particles using apoferritin ». Seibutsu Butsuri 40, supplement (2000) : S191. http://dx.doi.org/10.2142/biophys.40.s191_3.

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El-Nashar, D. E., S. H. Mansour et E. Girgis. « Nickel and iron nano-particles in natural rubber composites ». Journal of Materials Science 41, n^o 16 (8 juin 2006) : 5359–64. http://dx.doi.org/10.1007/s10853-006-0179-4.

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Deraz, N. M. « Formation and Magnetic Properties of Metallic Nickel Nano-Particles ». International Journal of Electrochemical Science 7, n^o 5 (2012) : 4608–16. http://dx.doi.org/10.1016/s1452-3981(23)19565-4.

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Jamali, Asif Ali, Amber R. Solangi, Najma Memon, Shafi M. Nizamani, Abid Ali Khaskheli, Masood Hussain, Mohamed H. Mahmoud, Hassan Fouad et M. S. Akhtar. « Abiotic Degradation of Imidacloprid Pesticide with L-Threonine Capped Nickel Nanoparticles ». Science of Advanced Materials 13, n^o 10 (1 octobre 2021) : 2043–48. http://dx.doi.org/10.1166/sam.2021.4150.

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Present study demonstrates the fabrication of L-threonine protected nickel nano particles (L-threonine–Ni NPs) and their application for the reduction of toxic imidacloprid pesticides in the presence of NaBH4. The synthesized nano particles were further characterized by atomic force microscopy (AFM), FT-IR, and HR-TEM. A quick and efficient method was developed for the decrease of imidacloprid into presence of synthesized nickel nanoparticles. Reduction was carried out at ambient conditions and catalyst was found to be highly effective incomplete reduction of imidacloprid within 90 s. Results also confirm the successful recovery and reusability of Ni NPs without deterioration in its performance after first application cycle. Kinetic study showed that the reduction of pesticide into presence of nickel nanoparticles initially follows pseudo-second order and then pseudo-first order at higher concentrations.

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AHN, SEUNGHYUN, HYUN KOO, SUNG-HWAN BAE, CHAN PARK, GUYOUNG CHO, IKWHANG CHANG, SUK-WON CHA et YOUNG-SUNG YOO. « EFFECT OF NICKEL CONTENTS ON THE MICROSTRUCTURE OF MESOPOROUS NICKEL OXIDE/GADOLINIUM-DOPED CERIA ». Functional Materials Letters 06, n^o 06 (27 novembre 2013) : 1350055. http://dx.doi.org/10.1142/s1793604713500550.

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The effect of NiO contents on the microstructure of mesoporous NiO - Gd 0.25 Ce 0.75 O 2-x ( NiO -GDC) composite for intermediate temperature solid oxide fuel cells (IT-SOFC) was investigated. Mesoporous NiO -GDC powders with different NiO contents were synthesized by self-assembly hydrothermal method using tri-block copolymer, Pluronic F127, as a structure directing agent. Grain growth/agglomeration behaviors of NiO particles and changes of mesoporous structure of GDC particles were characterized by microstructural analyses. NiO -GDC powders were composed of GDC nano particles with ordered mesopore inside the particles and octahedral NiO grains with truncated-edges. As the amount of NiO increases, specific area value of mesoporous NiO -GDC was decreased, and the agglomeration/growth behavior of NiO grains was accelerated.

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Abdel-Mohsen, Fawzia Fahim, et Hassan Salah Aly Emira. « Spectrally selective nano-absorber pigments ». Pigment & ; Resin Technology 44, n^o 6 (2 novembre 2015) : 347–57. http://dx.doi.org/10.1108/prt-08-2014-0065.

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Purpose – The purpose of this study was to prepare colour pigments for use as spectrally selective coatings for solar absorbers. Design/methodology/approach – Nano-particles cobalt and nickel oxides were prepared by sol–gel techniques. These oxides were prepared with its molar ratios and annealed at 200, 400, 600 and 800°C. The structure of the pigments was characterized by infrared spectrometer, differential scanning calorimetry analysis, X-ray diffraction, transmission electron microscope and scanning electron microscope. Findings – Encapsulated cobalt and nickel oxides were completely formed at 800 and 600°C, and its colour was black and dark green, respectively. The results confirmed that black and green pigments combined selectivity with colour. Optical properties such as absorption and reflection were affected by the firing temperatures on cobalt and nickel oxides–gel polymers. All synthesized pigments consisted of nano-particles. Research limitations/implications – The prepared samples used in the present work were synthesized from cobalt chloride and nickel acetate. The salts were dispersed in polyacrylamide as a precursor. Practical implications – The prepared metal oxides had good solar properties. Originality/value – Colour becomes more important for thermal solar collectors, and it has attracted interest. This might be related to a generally growing attention towards architectural integration of solar energy systems into building. Architects would prefer different colours besides black, even if lower efficiency would have to be accepted.

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Zhou, Xinyu, Yiyong Wang, Xianglin Liu, Zhipeng Liang et Hui Jin. « Electrodeposition Kinetics of Ni/Nano-Y2O3 Composite Coatings ». Metals 8, n^o 9 (27 août 2018) : 669. http://dx.doi.org/10.3390/met8090669.

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Ni/nano-Y2O3 composite films were successfully prepared by electrochemical deposition using an acid sulfamate bath. The influence of solid particles added to electrolyte on electrodeposition was investigated by electrochemical measurement methods. The linear sweep voltammetry test showed that the composite deposition took place at a greater potential than that of nickel, and the presence of nano-Y2O3 decreased cathodic polarization. Chronoamperometry studies indicated that the nucleation model of both deposits similarly approached the theoretical instantaneous nucleation mode based on the Scharifker–Hills model. The Y2O3 particles adsorbed on the cathodic surface were shown to facilitate the nucleation/growth of the nickel matrix which is consistent with the deposition kinetics parameters calculated by non-linear fitting experimental curves. The results of electrochemical impedance spectroscopy showed that the presence of Y2O3 particles in a bath is beneficial for the decrease in charge transfer resistance in the deposition. The atomic force microscopy observations of both deposits obtained in the initial electrodeposition stage confirmed that the Ni-Y2O3 composite had a higher grain number and finer mean grain size.

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D. V. Anandhi, S. Selvanandan et M. S. Shivakumar. « Amalgamation and Characterization of NiCo Ferrite by using Sol-gel Auto Combustion Technique ». ACS Journal for Science and Engineering 2, n^o 2 (1 septembre 2022) : 61–67. http://dx.doi.org/10.34293/acsjse.v2i2.39.

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The effect of Nickel doped Cobalt ferrite nano particles Ni0.2CoxFe2-x04(x=0.1, 0.2, 0.3, 0.5) Created by sol-gel auto combustion technique by using citric acid as fuel. The single phase cubic structure form confirm by the XRD. The crystalline size calculated by FWHM of (311) plane using Scherer’s formula. The typicalsize of the crystalline sample varies in the order of nano regime. The structural and lattice parameter were obtained by XRD data. The surface morphology of Nickel doped Cobalt ferrites was studied by Field Emission Scanning Electron Microscope (FESEM), and Scanning Electron Microscope (SEM) images. The spherical particles with the average grain size 25.62nm to 33.69nm range are observed by FESEM images. Compositional stoichiometry was confirmed by X-ray photo electron spectroscopy.

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Chen, Zhouhao, Zhipeng Ma, Jianjun Song, Lixin Wang et Guangjie Shao. « A novel approach for the preparation of Ni–CeO2 composite cathodes with enhanced electrocatalytic activity ». RSC Advances 6, n^o 65 (2016) : 60806–14. http://dx.doi.org/10.1039/c6ra14667h.

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Gadhari, Prasanna, et Prasanta Sahoo. « Electroless Nickel-Phosphorus Composite Coatings ». International Journal of Manufacturing, Materials, and Mechanical Engineering 6, n^o 1 (janvier 2016) : 14–50. http://dx.doi.org/10.4018/ijmmme.2016010102.

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Electroless nickel composite coatings possess excellent mechanical and tribological properties such as, hardness, wear and corrosion resistance. Composite coatings can easily be coated not only on electrically conductive materials but also on non-conductive materials like as fabrics, plastics, rubber, etc. This review emphasizes on the development of electroless nickel composite coatings by incorporating different types of hard/soft particles (micro/nano size) in the electroless Ni-P matrix to improve the mechanical and tribological properties of the coatings. The preparation of electroless bath for nickel-phosphorus composite coating, methods to incorporate hard and/or soft particles in the bath, factors affecting the particle incorporation in the coating and its effect on coating structure, hardness, wear resistance, friction behavior, corrosion resistance, and mechanical properties are discussed thoroughly.

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K M A, Haque, Hussain M S, Alam S. S et Islam S. M. S. « Effect of Temperature on the Synthesis of Nano-Nickel Particles ». Nanoscience and Nanotechnology 2, n^o 4 (31 août 2012) : 104–8. http://dx.doi.org/10.5923/j.nn.20120204.03.

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Hussain, M. S., et K. M. A. Haque. « Synthesis of nano-aggregated nickel particles by a chemical process ». Materials Technology 25, n^o 5 (novembre 2010) : 289–91. http://dx.doi.org/10.1179/175355510x12692596613729.

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Kurt, Halil Ibrahim, Engin Ergul, Necip Fazil Yilmaz et Murat Oduncuoglu. « Surface functionalization of nano MgO particles with nickel and cobalt ». Materials Research Express 6, n^o 8 (17 juin 2019) : 0850f1. http://dx.doi.org/10.1088/2053-1591/ab278f.

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Wada, Yuji, Hiromitsu Kuramoto, Takao Sakata, Hirotaro Mori, Takayuki Sumida, Takayuki Kitamura et Shozo Yanagida. « Preparation of Nano-sized Nickel Metal Particles by Microwave Irradiation ». Chemistry Letters 28, n^o 7 (juillet 1999) : 607–8. http://dx.doi.org/10.1246/cl.1999.607.

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Deraz, N. M., et A. Alarifi. « Processing and Evaluation of Alumina Doped Nickel Ferrite Nano-Particles ». International Journal of Electrochemical Science 7, n^o 5 (2012) : 4585–95. http://dx.doi.org/10.1016/s1452-3981(23)19563-0.

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Singh, Meenu, Yeshvandra Verma et Suresh VS Rana. « Potential toxicity of nickel nano and microparticles on the reproductive system of female rats : A comparative time-dependent study ». Toxicology and Industrial Health 38, n^o 4 (30 mars 2022) : 234–47. http://dx.doi.org/10.1177/07482337221074762.

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Increased application of engineered nanoparticles in different sectors viz. agriculture, commerce, industry, and medicine has raised serious public health issues. Nanoparticles of nickel have been increasingly used as catalysts, conductive pastes, adhesives, nanowires, and nanofilters. Human and animal exposure to these particles may cause toxicity in different organs/systems. Studies made in the past had demonstrated their toxicity in liver, kidney, and lungs. However, their reproductive effects remain poorly understood. Therefore, the present study on reproductive toxicity of nickel nanoparticles (<30 nm) was executed in female Wistar rats. A comparison of results obtained in nickel microparticle-treated rats was also made. Rats were administered nano and microparticles through gavage at a dosage of 5 mg/kg body weight each for two exposure periods; that is, 15 and 30 days. Ovaries removed from these rats were analyzed to study the effects of nickel bioaccumulation on synthesis of steroid hormones, lipid peroxidation, apoptosis, and oxidative stress. Structural changes were monitored through histopathological and ultrastructural observations. The present study showed exposure time-dependent differences in the toxicity of nickel nano and microparticles in the ovary of rats. Nano nickel was cumulative in the ovaries. It affected steroidogenesis. Further, increased generation of reactive oxygen species and enhanced oxidative stress may have contributed to cytotoxicity. It was concluded that exposure to nano nickel might induce irreversible damage in the ovaries of rat.

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Yang, Hua, Shi Yun Dong et Bin Shi Xu. « Microstructure and Properties of Brush Electroplated Nano-SiC-Al₂O₃/Ni Composite Coating ». Key Engineering Materials 373-374 (mars 2008) : 285–88. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.285.

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This paper investigated the effect of nano-SiC particle on microstructure and properties of brush electroplated nano-Al2O3/Ni composite coating. Three kinds of coatings, such as pure nickel coating, nano-Al2O3/Ni composite coating and nano-SiC-Al2O3/Ni composite coating, were fabricated on 1045 steel substrate. Before deposited, Zeta potential of nano-particles in the solution was examined. The results show Zeta potential of the nanoparticles in the nano-Al2O3/Ni electrolyte is negative, but that of the nanoparticles in nano-SiC-Al2O3/Ni electrolyte is positive when the pH value of electrolyte is about 7.5. Energy dispersive spectroscopy (EDS) results show Al element content in the nano-Al2O3/Ni coating is 5.65%, while the content of Al and Si elements in nano-SiC-Al2O3/Ni coating is 5.63% and 4.86% respectively. It confirms that nano-SiC particle co-deposited in the composite coating while nano-Al2O3 particle content keeps constant. The microhardness of nano-SiC-Al2O3/Ni coating exhibits the highest, while the pure nickel coating is the lowest. And surface morphology of nano-SiC-Al2O3/Ni coating is the most smooth and compact among the three coatings. The wear test results reveal that wear resistance of nano-SiC-Al2O3/Ni coating is 1.7 times of that of nano-Al2O3/Ni coating, and 2.3 times of that of pure nickel coating. The above results show the nano-SiC particle services a strengthening effect on the combination performance of nano-SiC-Al2O3/Ni coating.

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Awaji, Hideo, Takuya Matsunaga et Seong Min Choi. « Nanocomposites – Toughened Ceramics ». Key Engineering Materials 336-338 (avril 2007) : 2242–46. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.2242.

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In order to improve fracture toughness of ceramics, an intrinsically small frontal process zone (FPZ) size must be expanded. An intra-type nano-structure, where nano-particles are embedded within matrix grains, yields dislocations around the dispersed particles due to residual stresses. These dislocations become sessile dislocations at room temperature, operate as origins of small stress concentration in the matrix, and create nano-cracks in the FPZ. To produce the intra-type nano-structure, we developed a soaking method. This method makes it possible to produce nano-sized metallic particles dispersed within ceramic powders. In this research, alumina-nickel nanocomposite powder was obtained using the soaking method. The powder mixed with α-alumina as a seed was sintered using a pulse electric current sintering technique. The sintered nanocomposites are then annealed to disperse dislocations around the nanoparticles into alumina grains. Results showed that the maximum fracture toughness was 7.6 MPam1/2, which was two times higher than that of alumina.

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Cheng, Jialiang, Huey H. Hng, Hsiao Y. Ng, Pei C. Soon et Yiew W. Lee. « Improved thermal properties of Al powders coated with submicron-sized hollow nickel particles ». Journal of Materials Research 24, n^o 10 (octobre 2009) : 3220–25. http://dx.doi.org/10.1557/jmr.2009.0389.

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This work investigates the coating of nano- to submicron-sized hollow nickel particles onto Al powders to optimize the thermal and combustion properties of Al-based energetic materials. Different wt% of hollow nickel particles coated onto Al particles was synthesized using an autocatalytic aqueous reduction method. X-ray diffraction results showed distinct crystalline Al and Ni phases indicating that a pure coating process was achieved. Homogeneous coating of hollow nickel particles onto individual Al particles was also reflected from the scanning electron microscope images. All the samples showed significant improvements in terms of their ignition and kinetics of combustion as compared to untreated Al. The most promising candidate produced was the 30wt%Ni–Al sample whereby the %complete combustion of Al exhibited the largest improvement. The hollow Ni-coated Al samples were also found to perform better than their physically mixed Ni–Al powder samples, as there is more intimate contact between the two components to hasten the overall combustion kinetics.

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Zhang, Qiaoran, Abdelhafid Zehri, Jiawen Liu, Wei Ke, Shirong Huang, Martí Gutierrez Latorre, Nan Wang et al. « Mechanical property and reliability of bimodal nano-silver paste with Ag-coated SiC particles ». Soldering & ; Surface Mount Technology 31, n^o 4 (2 septembre 2019) : 193–202. http://dx.doi.org/10.1108/ssmt-05-2018-0014.

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Purpose This study aims to develop a bimodal nano-silver paste with improved mechanical property and reliability. Silicon carbide (SiC) particles coated with Ag were introduced in nano-silver paste to improve bonding strength between SiC and Ag particles and enhance high-temperature stability of bimodal nano-silver paste. The effect of sintering parameters such as sintering temperature, sintering time and the proportion of SiC particles on mechanical property and reliability of sintered bimodal nano-silver structure were investigated. Design/methodology/approach Sandwich structures consist of dummy chips and copper substrates with nickel and silver coating bonded by nano-silver paste were designed for shear testing. Shear strength testing was conducted to study the influence of SiC particles proportions on the mechanical property of sintered nano-silver joints. The reliability of the bimodal nano-silver paste was evaluated experimentally by means of shear test for samples subjected to thermal aging test at 150°C and humidity and temperature testing at 85°C and 85 per cent RH, respectively. Findings Shear strength was enhanced obviously with the increase of sintering temperature and sintering time. The maximum shear strength was achieved for nano-silver paste sintered at 260°C for 10 min. There was a negative correlation between the proportion of SiC particles and shear strength. After thermal aging testing and humidity and temperature testing for 240 h, the shear strength decreased a little. High-temperature stability and high-hydrothermal stability were improved by the addition of SiC particles. Originality/value Submicron-scale SiC particles coated with Ag were used as alternative materials to replace part of nano-silver particles to prepare bimodal nano-silver paste due to its high thermal conductivity and excellent mechanical property.

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Dimitrakopoulos, Georgios, Ahmed F. Ghoniem et Bilge Yildiz. « In situ catalyst exsolution on perovskite oxides for the production of CO and synthesis gas in ceramic membrane reactors ». Sustainable Energy & ; Fuels 3, n^o 9 (2019) : 2347–55. http://dx.doi.org/10.1039/c9se00249a.

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In situ exsolution of nickel nano-particles on both sides of ceramic membrane reactors to accelerate the co-production of CO and synthesis gas through CO₂ splitting and CH₄ partial oxidation, respectively.

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Uhm, Young Rang, et Chang Kyu Rhee. « Synthesis and Magnetic Properties of Ni and Carbon Coated Ni by Levitational Gas Condensation (LGC) ». Journal of Nanomaterials 2013 (2013) : 1–6. http://dx.doi.org/10.1155/2013/427489.

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The nickel (Ni), and carbon coated nickel (Ni@C) nanoparticles were synthesized by levitaional gas condensation (LGC) methods using a micron powder feeding (MPF) system. Both metal and carbon coated metal nano powders include a magnetic ordered phase. The synthesis by LGC yields spherical particles with a large coercivity. The abnormal initial magnetization curve for Ni indicates a non-collinear magnetic structure between the core and surface layer of the particles. The carbon coated particles had a core structure diameter at and below 10 nm and were covered by 2-3 nm thin carbon layers. The hysteresis loop of the as-prepared Ni@Cs materials with unsaturated magnetization shows a superparamagnetic state at room temperature.

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Sharef, Enas M., et Jamal M. A. Ali. « The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement ». Al-Khwarizmi Engineering Journal 15, n^o 1 (1 mars 2019) : 109–16. http://dx.doi.org/10.22153/kej.2019.06.003.

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The Nano materials play a very important role in the heat transfer enhancement. An experimental investigation has been done to understand the behaviors of nano and micro materials on critical heat flux. Pool boiling experiments have used for several concentrations of nano and micro particles on a 0.4 mm diameter nickel chrome (Ni-Cr) wire heater which is heated electrically at atmospheric pressure. Zinc oxide(ZnO) and silica(SiO2) were used as a nano and micro fluids with concentrations (0.01,0.05,0.1,0.3,0.5,1 g/L), a marked enhancement in CHF have been shown in the results for nano and micro fluids for different concentrations compared to distilled water. The deposition of the nano particles on the heater surface was the reason behind the enhancement of the wettability of the surface which will increase the CHF, this nano particles deposition will form a porous layer and the mechanism of the formation of this layers is that as vapor bubbles grow, the evaporating liquid in the micro layer leaves behind Nano particles which then will be concentrated at the base of the bubble to form this pours layer. The higher wettability can produce CHF enhancement, the enhancement ratio of Nano fluid is observed to be higher than that of micro fluid, the optimum enhancement ratios of nano fluid is (1 g/l) which observed to be 9.2 % for ZnO and 8.7% for Sio2, and also (1 g/l) for micro fluid which observed to be 8.1%for ZnO and 7.4%for SiO2.

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Allahkaram, S. R., S. Salmi et E. Tohidlou. « AN INVESTIGATION ON EFFECTS OF TiO2 NANO-PARTICLES INCORPORATED IN ELECTROLESS NiP COATINGS' PROPERTIES ». International Journal of Modern Physics : Conference Series 05 (janvier 2012) : 833–40. http://dx.doi.org/10.1142/s2010194512002814.

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Electroless composite coatings have been vastly used in various industries during last decades due to their good properties, such as corrosion and wear resistance, hardness and uniform thickness. In this paper, co-deposition of TiO 2 nano-particles with Nickel-Phosphorus electroless coatings on API-5L-X65 steel substrates was investigated. Surface morphology and composition of coatings were studied via SEM and EDX, respectively. XRD analyses showed that these coatings had amorphous structure with TiO 2 crystalline particles. TiO 2 nano-particles increased microhardness of coatings. Corrosion resistance of these coatings was tested using linear polarization in 0.5M sulfuric acid electrolyte. Results showed that NiP - TiO 2 electroless composite coatings increased corrosion resistance of substrates.

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Chen, Hai Feng, et Ting Yan. « Preparation and Photocatalytic Properties of Nano Ni/TiO₂ Composite in Alginate ». Key Engineering Materials 531-532 (décembre 2012) : 539–42. http://dx.doi.org/10.4028/www.scientific.net/kem.531-532.539.

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New nano nickel-doped titanium dioxide composites had been produced by a conducting sol-gel method. The alginate gel was used as a template to prevent the conglomeration of the inorganic materials. In this experiment, nickel nitrate, tetrabutyl titanate and sodium alginate were used as main materials to prepare different amount nickel-doped TiO2 particles. The amount of Ni was studied from 0 to 9 mol.-% (where mol.-% refers to the Ni/TiO2 molar ratio), and the Ni/TiO2 composites were characterized by XRD, FT-IR, TG-DTA, and we carried out doping amount, catalyst amount and illumination time influence on photocatalytic performance of nano Ni/TiO2 composite in aqueous methyl orange. The activity of TiO2 gradually increased with the increasing of doping amount, and there was highest catalytic efficiency when Ni = 9 % mol.

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Chengyu, Tan, Cui Hang, Hu Wei, Liu Yu et Zheng Ziqiao. « Influence of Nano-Al2O3 Particles on Nickel Electrocrystallization at Initial Stage ». Rare Metal Materials and Engineering 39, n^o 1 (janvier 2010) : 10–16. http://dx.doi.org/10.1016/s1875-5372(10)60073-2.

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Gu, Yi, Changqing Xia, Jia Li, Wenhua Wu et Anru Wu. « Study of ultra-fine ceramic coatings containing nano-size nickel particles ». Surface and Coatings Technology 200, n^o 7 (décembre 2005) : 2504–9. http://dx.doi.org/10.1016/j.surfcoat.2005.03.047.

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Johnson, Timothy M., David T. Fullwood et George Hansen. « Strain monitoring of carbon fiber composite via embedded nickel nano-particles ». Composites Part B : Engineering 43, n^o 3 (avril 2012) : 1155–63. http://dx.doi.org/10.1016/j.compositesb.2011.09.014.

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K.A.Ahamed, S., Vasant Naidu, S. Amalorpava Mary et S. Vijay Anand. « Magnetic Property Study of Nickel Cerium Doped Zinc Ferrite Nano Particles ». International Journal of Computer Applications 40, n^o 4 (29 février 2012) : 7–12. http://dx.doi.org/10.5120/5030-7180.

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Miyamoto, H., S. Takehara, T. Uenoya, H. Fujiwara et T. Goto. « Nanocrystalline nickel dispersed with nano-size WO3 particles synthesized by electrodeposition ». Journal of Materials Science 47, n^o 12 (15 mars 2012) : 4798–804. http://dx.doi.org/10.1007/s10853-012-6322-5.

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Abdel Rahim, M. A., H. B. Hassan et R. M. Abdel Hameed. « Graphite Electrodes Modified with Platinum-Nickel Nano-Particles for Methanol Oxidation ». Fuel Cells 7, n^o 4 (août 2007) : 298–305. http://dx.doi.org/10.1002/fuce.200600046.

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