APPLIED ELECTROCHEMISTRY AND METAL CORROSION PROTECTION (original) (raw)
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Copper nanowire arrays surface wettability control using atomic layer deposition of TiO2
Russian Journal of Applied Chemistry, 2016
Template two step electrodeposition method and atomic layer deposition were used to synthesize copper nanowires of varied length (1.2 to 26.2 μm) and copper nanowires coated with titanium dioxide. As a result of the atomic layer deposition of TiO 2 , coated nanowires demonstrated an up to 10-fold decrease in the wetting angle, compared with uncoated nanowires. It was found the dissipation rate is substantially higher for nanowires coated by the atomic layer deposition method (100 s) as compared with the uncoated copper nanowires (400 s), which assumes the positive properties of water propagation along the surface, necessary for improving the heat transfer. It was also found that the water contact angle for uncoated nanowires and those coated with TiO 2 by the atomic layer deposition (ALD) gradually increases as the samples are kept in air. A gradual increase in wettability was also observed for smooth silicon wafers coated by ALD of TiO 2 , which were exposed to air. On the coated silicon substrates, the wetting angle gradually increased from 10° to approximately 56° in the course of four days. In addition, it was shown that copper nanowires coated with TiO 2 by the atomic layer deposition method have an excellent corrosion resistance, compared with uncoated nanowires, when brought in contact with air and water.
Depositional Characteristics of Metal Coating on Single-Crystal TiO2 Nanowires
The Journal of Physical Chemistry B, 2005
Ultralong single-crystalline TiO 2 nanowires were prepared by a simple, low-cost solvothermal process. Silver nitrate, neodymium chloride, ceric nitrate, stannic chloride hydrate, and cadmium chloride were used as metal sources and deposited by reduction on the surface of TiO 2 nanowires. The composites were subsequently characterized by transmission electron microscopy, and their coverage was compared. The nature of the coatings on the TiO 2 nanowires varies from metal to metal. A novel approach on modified one-dimensional nanostructures with metal coating was developed, which has great potential applications in catalysts, sensors, and nanoscale devices.
Fabrication of copper nanowires by electrodeposion method
The present work focuses on the synthesis of copper nanowires. Copper is one of the most important metals in modern electronic technology. We are trying to synthesize copper nanowires from the aqueous solution of copper (II) sulphate on glass filter paper. Electro chemical deposition technique based on the principle of electroplating was adopted for copper nanowire synthesis.Diameter and length of wire depends on the supply voltage, temperature, time for deposition. The studies have revealed the formation of fine, uniform arrays of mono and poly crystalline copper nanowires which show potential applications in nanodevices, chemical and biological sensors, optical and electronic devices because of their unique electrical, magnetic, optical as well as their mechanical properties.
Electrochemical Deposition of Composite Coatings in Copper Matrix with TiO2 Nanoparticles
Revue Roumaine de Chimie
Cu-nanoTiO2 composite coatings were obtained from copper sulphate bath by electroplating. The paper presents the influence of the concentration of TiO2 nanoparticles as dispersed phase in copper matrix coatings obtained by electrocodeposition at different current densities. The concentration of n-TiO2 (17nm) was between 5 and 50g/L in electroplating baths. The purpose was to increase particle content in the coating to obtained high hardness values. The present work was undertaken to elucidate the mechanism and principal factors affecting the incorporation of the solid particles into a deposit. The aim was to improve the electroplating process and to modify the coating properties such as mechanical properties. The surface morphology and composition were studied by light and scanning electron microscopy (SEM) and EDAX analysis The results have shown that nano-TiO2 particles in solution or embedded in small amount in the copper matrix has an influence on the structure and properties of...
Effect of temperature on the wettability of CuO nanowires
2016
CuO has been prepared by a thermal method in different temperature 300-600°C, the water contact angles of CuO film were measured by the contact angle goniometer; the contact angles were investigated to see the effect of temperature on the wettability of the CuO film which was found to be hydrophilic in nature. The copper before treatment is hydrophobic then, it changed to hydrophilic after the treatment in different temperature.
Scientific Reports, 2018
Oxidation can strongly influence the performance of Cu nanowires (CuNWs) by decreasing their conductivity. Here, we identify and investigate a way to prevent the oxidation process of CuNWs to maintain the high conducting performance of CuNWs as transparent electrodes. CuNWs were synthesised using an aqueous method. We prepared several temperature treatments (from 0–300 °C) to represent oxidation of CuNWs in different environments, to study the oxidation process and changes in morphology in detail. Depending on the temperature, smooth and uniform CuNWs exposed to oxidation produced rough Cu2O and CuO nanowires. We then suggest a method of protecting nanowires from oxidation, using the Mayer rod coating method to apply a layer of PEDOT:PSS to a transparent conducting film of CuNWs. The result indicates that this method of protection can protect the film, and maintain a stable, and constant resistance over of time, without effecting the excellent conductivity properties of pure CuNWs.
International Journal of Engineering Transactions C: Aspects ISSN: 2423-7167 e- ISSN:1735-9244, 2018
The excellent heat transfer properties of copper make it used in the manufacturing of various equipment of heat transfer applications. The contamination of copper in water circulation system is one of the serious industrial problems [1]. This contamination commonly results from copper corrosion reactions in boiler feed water environment. The contamination of copper could be reduced by improving copper corrosion resistance in the water. This research studies the developing of copper corrosion resistant by using anodization technique. The anodization experiments are conducted in oxalate solutions of concentrations from 0.1 to 0.5 M, at a temperature range from 24 to 0 ο C and applied potential from 7.5 to 9 V. Anodized coating was analyzed using field emission scanning microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. Characterization results referred to the formation of copper oxide anodized coating with grain size range from 25 to 68 nm. The tests of the corrosion resistance of the anodized copper samples were carried out in simulated boiler feed water. The results show the enhancement of corrosion resistance of anodized samples. The corrosion protection efficiencies for the anodized coating was increased 86.2% and 74.5% in testing solutions contains 3.5% NaCl, and 2 mg/l NH3, respectively.
Optics, 2014
Cu-nanoTiO 2 composite coatings electroplated from copper sulfate bath were obtained and characterized.The paper presents the influence of the different pH of Cu-TiO 2 coatings obtained at DC current density. The pHwere 0.5and2in electroplating bath.The surface morphology andcomposition of layers were studied by scanning electron microscopy (SEM) and EDX analysis.The influences of pH parameter on the thickness, grain size and surface morphology of coating were studied.
International Journal of Engineering (IJE) TRANSACTIONS C: Aspect, 2018
The excellent heat transfer properties of copper it is the reson behind its use in the manufacturing of various equipment of heat transfer applications. However, contamination of water by copper in water circulation systems is one of the serious industrial problems [1]. This contamination commonly results from copper corrosion reactions in boiler feed water environment. The contamination of copper could be reduced by improving copper corrosion resistance in water. This research studies the developing of copper corrosion resistant by using anodization technique. The anodization experiments are conducted in oxalate solutions of concentrations from 0.1 to 0.5 M, at a temperature range from 24 to 0 ο C and applied potential from 7.5 to 9 V. Anodized coating was analyzed using field emission scanning microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. Characterization results referred to the formation of copper oxide anodized coating with grain size range from 25 to 68 nm. The tests of the corrosion resistance of the anodized copper samples were carried out in simulated boiler feed water. The results show the enhancement of corrosion resistance of anodized samples. The corrosion protection efficiencies for the anodized coating increased 86.2% and 74.5% in testing solutions contains 3.5% NaCl, and 2 mg/l NH3, respectively.