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3709 results. per page « 1 2 3 4 5 6 7 8 9 10 11 »

Fabrication and characterization of ITO thin films on heat-resistant transparent flexible clay films.

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Fabrication and characterization of nanolayered single element nitride coating.

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Fabrication and characterization of polymethylmethacrylate (PMMA) thin film by plasma polymerization used for cell culture.

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Fabrication and characterization of porous anodic alumina films from impure aluminium foils.

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JES

Fabrication and characterization of porous bioceramic composites based on hydroxyapatite and titania.

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Fabrication and characterization of silver/nickel sulphide solar absorber coatings on stainless steel by chemical bath deposition.

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MCP Metal chalcogenide (silver/nickel sulphide) thin film absorber coatings on AISI SS 321 substrates were deposited using a chemical bath deposition technique. An aqueous solution of silver nitrate (AgNO3) and sodium thiosulphate pentahydrate (Na2S2O3·5H2O) was used as the chemical bath. A systematic study of the growth of silver/nickel sulphide thin films was carried out by varying the composition, temperature of the chemical bath in addition to the deposition time. Optimization of process parameters was carried out in order to achieve high solar selectivity. Depending on the ratio of AgNO3:Na2S2O3·5H2O used, either silver sulphide or nickel sulphide films were formed on SS 321. The silver/nickel sulphide films were characterized for their solar absorbance, thermal emissivity, phase purity and surface morphology. Thermal stability analysis and corrosion testing of the silver and nickel sulphide thin films confirmed that they were stable up to 300 °C in air and corrosion resistant, thus making them suitable for mid-temperature (<400 °C) solar heating and power generation applications without evacuation of the annular space between the absorber tube and the borosilicate cover glass tube.

Fabrication and Characterization of Thin Nano-Hydroxyapatite Coatings on Titanium.

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SURF Titanium is the most commonly used metallic material in the manufacture of orthopaedic implants, and hydroxyapatite (HA) is bioactive and biocompatible when used as bone substitutes. To improve biocompatibility and mechanical performance of prostheses, HA coating is often fabricated on titanium surfaces. Dip-coating techniques were used to fabricate HA coating of organic sol-gel of Ca(NO3)2.4H2O and PO(CH3)3 and inorganic sol of Ca(NO3)2.4H2O and (NH4)2.HPO4. Scanning electron microscopy (SEM) and grazing-incidence X-ray diffraction (XRD) have been used to characterize the morphology and the distributions of crystallite size and micro-strains of the coatings. After firing at 400 °C, the apatite structure of coatings on titanium began to appear. Warren-Averbach Fourier transfer analysis of the diffuse reflections indicated that the mean crystallite size increased and micro-strain decreased significantly with the rise in firing temperature. In the range of 400-600 °C, the effect of firing temperatures on mean crystallite size and micro-strain of both coatings was obvious. Precursor types of HA coating significantly affected the aggregating size of particles of nano-HA coatings, which were 25-40 nm for organic sol-gel and approximately 100 nm for inorganic sol. The morphology of interfaces between coating and titanium indicated thin nano-HA coatings with thickness 2 µm for organic sol-gel and 5 µm for inorganic sol were intact and homogenous. The effect of firing temperatures on aggregating size of particles of both coatings was not obvious.

Fabrication and characterization of TiB2/TiC and tungsten co-sputtered wear coatings

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Fabrication and Characterization of Vertically Aligned Carbon Nanofiber Electrodes for Biosensing Applications.

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Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg–Zn–Mn–Ca alloy.

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Fabrication and Corrosion Behaviour of Platinum-Coated Titanium Electrodes from Low Temperature Molten Salt Electrolytes.

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JAE

Fabrication and Corrosion Behaviour of Platinum-Coated Titanium Electrodes from Low Temperature Molten Salt Electrolytes.

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JAE

Fabrication and crystallization behaviors of sputtered nickel copper phosphorus films on tool steel

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SURF Electroless nickel is used as hard coating for many industrial applications. For advanced applications, it is essential to promote crystallization temp. of Ni-P deposits. Cu is introduced in Ni-P to improve thermal stability. Alternative of r.f. magnetron sputtering is applied to deposit Ni-Cu-P coatings to solve composition control. Ni-Cu-P coatings were deposited by r. f. magnetron sputtering on 420 tool steel substrates with Cu + Ni-P compound targets. Design of compound targets with Cu and Ni-P by considering surface ratio of constituents exhibits controllable composition in film. Ni-Cu-P coating can be modified by original Ni-P deposits of compound target along with Cu area ratio in compound target. All as-sputtered (70.18-82.26at.%)Ni-(17.17-1.39 at.%)Cu-(12.65-16.35 at.%)P deposits are amorphous. Hardness decreases with increasing Cu content. Nevertheless, hardness is still greater than that of substrate. After annealing, structure of amorphous Ni-Cu-P deposits will transform directly into Ni-Cu alloy and Ni3P phase. Ni-Cu-P films can be hardened by pptn. of Ni3P phase and crystallization of Ni-Cu. Introduction of Cu into Ni-Cu-P deposits increases crystallization temp. Annealing temp. associated with peak hardness in (82.26 at.%)Ni-(1.39 at. %)Cu-(16.35 at.%)P and (74. 27 at.%)Ni-(12.65 at.%)Cu-(13.08 at. %)P films is c. 365 and 380°C, resp. Thermal stability of Ni-Cu-P films is enhanced by increasing Cu content in sputtered deposits.

Fabrication and degradation behavior of micro-arc oxidized biomedical magnesium alloy wires.

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SURF A composite ceramic coating containing zirconium is prepared by micro-arc oxidation (MAO) of magnesium alloy wires in a silicate-phosphate composite electrolyte modified with zirconium salts and sodium hydroxide. The effects of the NaOH content in the electrolyte on the microstructure and corrosion resistance of the composite ceramic coating are determined and the degradation behavior is investigated in both simulated body fluid (SBF) and simulated intestinal fluid (SIF). By adding an appropriate amount of NaOH to the composite electrolyte with K2ZrF6, the arcing voltage can be reduced and the surface flatness, pore size, and surface coating thickness can be effectively regulated to improve the corrosion resistance. The composite ceramic coating composed of MgO, MgSiO3, and a small amount of ZrO2 retards surface degradation in both the SBF and SIF environments at different pH values.

Fabrication and Electrochemical Performance of Porous Nickel-Based Hybrid Electrodes from Anodized Etched Aluminum.

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JES