Copper (II) oxides

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Synthesis of Copper Oxides Nanostructures by an Overstressed Nanosecond Discharge in Atmospheric Pressure Air between Copper Electrodes

Synthesis of Copper Oxides Nanostructures by an Overstressed Nanosecond Discharge in Atmospheric Pressure Air between Copper Electrodes

Nanostructures of transition metal oxides are now widely used in various technical devices and technologies, medicine, in particular, and in modern solar cells [1-3]. In addition to various modifications of chemical methods for the synthesis of copper and zinc nanostructures, as well as their oxides, physical methods for the synthesis of similar nanostructures that also develop intensively are promising. The main directions of synthesis of such nanostructures are the use of laser plasma in vacuum or liquid conditions [4, 5]. A promising method for synthesizing nanostructures of metals and their oxides is a pulsed discharge in distilled water or ethyl alcohol between metal electrodes [6, 7]. But these methods of synthesis have a number of drawbacks-the high cost of laser and vacuum equipment and the low yield of useful materials. For powerful nanosecond discharges in a liquid, the rapid burnout of electrodes is characteristic, which leads to a change in the conditions for the synthesis of nanostructures. Therefore, it is actual to search for other electric-discharge technologies for the synthesis of nanostructures that would be based on a high-voltage diffuse discharge of nanosecond duration in

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Characteristics Of Supergene Copper Oxides Mineralization In The Binamar Area, Ardabil, Nw Iran

Characteristics Of Supergene Copper Oxides Mineralization In The Binamar Area, Ardabil, Nw Iran

Copper oxides represent an attractive exploration target because even low-grade prospects have the potential to produce low-cost copper in an environmentally friendly fashion. Derived from hypogene and/or supergene sulfides, copper oxides comprise a series of distinct assemblages that characterize a variable pH, oxidizing geochemical environment known as “the oxide zone.” Development of oxide copper minerals is a function of source-rock and host-rock mineralogy, pyrite and other sulfide abundance and distribution, fracture density and distribution, phreatic and/or vadose zone occurrence and stability, and maturity of the weathering profile.

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Optical Properties of Copper Oxides (CuO) and Titanium Oxides (TiO2) Nanoparticles

Optical Properties of Copper Oxides (CuO) and Titanium Oxides (TiO2) Nanoparticles

performance of 0.7 Said.et.al. [10] it also found the titanium oxides Nanofluids is performing better than aluminium Nanofluids and has better optical property. there has been researching showing that 10PPM of nanoparticles such as nickel is performing better than the copper nanoparticles with the same volume fraction, they have also investigated that Nickel with carbon coated at 40PPM can absorb the 100% energy than compared with the pure nickel[11].

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Optical Properties of Copper Oxides (CuO) and Titanium Oxides (TiO2) Nanoparticles

Optical Properties of Copper Oxides (CuO) and Titanium Oxides (TiO2) Nanoparticles

performance of 0.7 Said.et.al. [10] it also found the titanium oxides Nanofluids is performing better than aluminium Nanofluids and has better optical property. there has been researching showing that 10PPM of nanoparticles such as nickel is performing better than the copper nanoparticles with the same volume fraction, they have also investigated that Nickel with carbon coated at 40PPM can absorb the 100% energy than compared with the pure nickel[11].

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Hydrothermal synthesis of copper (II) and Nickel (II) nano complexes with unsymmetric tetradentate Schiff base ligand. New precursors for preparation of copper (II) and nickel (II) oxides nano-particles

Hydrothermal synthesis of copper (II) and Nickel (II) nano complexes with unsymmetric tetradentate Schiff base ligand. New precursors for preparation of copper (II) and nickel (II) oxides nano-particles

Two new nano-particles of copper (II) and nickel (II) complexes, [Cu(cd5Clsalen)] (1) and [Ni(cd5Clsalen)] (2) with unsymmetrical tetradentate Schiff base ligand cd5Clsalen={methyl-2-[N-[2-(2-hydroxy-5-choloro-2phenyl) methylidynetrilo] ethyl}amino-1-cyclopentenedithiocarboxylate, were synthesized by hydrothermal method. These compounds were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (IR), and elemental analysis. The complexes (in bulk) have a NNOS coordination sphere, with two nitrogen atoms coordinated in a cis configuration. The coordination around nickel center is essentially square- planar with a small tetrahedral distortion and the geometry around the copper center is square planar. Nano-particles of copper (II) and nickel (II) oxides have been prepared by calcination of two different copper (II) and nickel (II) complexes at 450 ºC that were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and IR spectroscopy. The average size of the particles was estimated from the Sherrer formula. This study demonstrates that the Schiff base complexes may be suitable precursors for the preparation of nanoscale materials with different and interesting morphologies.

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Nanostructured Copper Oxides: Production and Applications

Nanostructured Copper Oxides: Production and Applications

Size and morphology of copper oxide particles have a strong effect on the optical, semiconducting, and piezoelectric properties of the material. To investigate for those effects and for possible applications, nanostructured copper oxides have been synthesised in several shapes such as nanobelts [25], nanorods [26], nanowires [27], and nanoribbons [28]. Several techniques, ranging from reverse micelles microemulsions [29], electrochemical and sonochemical deposition [30, 31], chemical vapour deposition [32], alcoho-thermal and hydrothermal synthesis [33, 34], thermal decomposition [35] and high-temperature synthesis [36] are available to produce such non-equilibrium morphologies. Self-assembly (e.g. reverse micelle microemulsions) driven e.g. by surface tension, capillary effects, electric and magnetic forces, and hydrophobic interactions, is an effective strategy for forming a wide variety of motifs, otherwise impossible to form under equilibrium conditions [34, 37, 38]. However, precise control over nanocrystalline CuO synthesis remains a big challenge.

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The use of Copper Oxides Supported Onto Biogenic Silica from the Leaves of Dendrocalamus Asper for Degradation of Congo Red

The use of Copper Oxides Supported Onto Biogenic Silica from the Leaves of Dendrocalamus Asper for Degradation of Congo Red

by UV or visible lights on semiconductors. The semiconductors generate electron-hole pairs, which may react with the surface hydroxyl groups, and oxygen molecules absorbed on the surface of the catalyst, thus yielding hydroxyl radical and the superoxide radical ion, respectively. Another possible mechanism involves the direct reaction between the photo-generated holes and the organic pollutant. In this case, the radical derived from the pollutant molecule reacts with both the OH-radicals and dissolved oxygen. 12–14 Copper oxides are being

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Photoelectrochemical Properties of Nanostructured Copper Oxides Formed Sonoelectrochemically

Photoelectrochemical Properties of Nanostructured Copper Oxides Formed Sonoelectrochemically

The chemical effects of the use of ultrasound coupled with chemical methods arise primarily from the acoustic cavitation phenomena which involve the formation, growing and implosive collapse of bubbles into a liquid media [2, 9, 11, 13, 25]. The implosive collapse of the bubble near the solid surface generates a strong current towards the solid surface, increasing the mass flow on the nanotubular surface. The quality of the nanotubes generated through the use of ultrasound would present a better quality because the mass transfer is uniform during the formation process [19]. This phenomenon had been used for the preparation of various inorganic nanomaterials as metals, chalcogenides, nanocomposites and metallic oxides among others [9, 13, 25, 27].

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Electrochemical Characterization of a Commercial Au-Ag-Cu Alloy in an Acidic Medium

Electrochemical Characterization of a Commercial Au-Ag-Cu Alloy in an Acidic Medium

The voltammograms obtained by the cyclic voltammetry method show potentials at which current waves occur successively corresponding to the number and the quantity of the phases present in the alloy, which can be used for characterisation of the investigated alloys. All voltammograms for gold and gold containing alloys exhibit anodic waves corresponding to the formation of the first OH monolayer, low and high valence gold oxides or their hydrated forms. A well-defined cathodic wave can be observed indicating gold oxide reduction. In addition, the voltammograms for the gold-copper alloys exhibit the current waves corresponding to the formation of copper oxides in the anodic region and their reduction in the cathodic region. The voltammograms for the gold-silver alloy also contain the current waves indicating oxidation of silver in the anodic region and its reduction in the cathodic region. The electrodes were obtained metallurgically. This paper presents investigation results of the possibility of using cyclic voltammetry to determine the composition of an commercial gold alloy declared as 14-carat gold [58.5 % Au + the most common alloying elements Ag and Cu, in the proportion 1:1] as well as a verification of pure gold declaration.

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Observation of Copper Corrosion Oxide Products Reduction in Metallic Samples by Means of Digital Image Correlation

Observation of Copper Corrosion Oxide Products Reduction in Metallic Samples by Means of Digital Image Correlation

The use of digital image correlation for optical monitoring of corrosion processes occurring in a metallic sample is here proposed. The formation and reduction of corrosion products (oxides) over the surface of an old copper coin immersed in an electrolytic basic mixture is analyzed through a standard electrochemical characterization and, simultaneously, registered by means of a simple optical experimental setup which corresponding sequential images are registered, stored and digitally processed utilizing a digital image correlation method. This method may be helpful for controlling electrochemical reduction of corrosion products processes, and could be also applied in antique objects cleaning and restoration.

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Effect of Different Binders on the Electrochemical Performance of Metal Oxide Anode for Lithium Ion Batteries

Effect of Different Binders on the Electrochemical Performance of Metal Oxide Anode for Lithium Ion Batteries

Figure 3a–d displays the charge-discharge curves of CuO at 0.2 C and the voltage range of 0.01 to 3.0 V using SBR+CMC binder at the ratio of 70:10:20, 75:10:15, 80:10:10, and 90:5:5, respectively. The viscosity of SBR was too small to be used as single binder so CMC was added to increase viscosity. As shown in Fig. 3, when using SBR+CMC as binder, all the discharge cap- acities of CuO anodes were much higher than that using PVDF binder. In addition, the cycling stability of CuO anode was improved when using SBR+CMC as binder, especially when the formula was that the slurry consist of 80 wt% CuO materials, 10 wt% acetylene black, and 10 wt% SBR+CMC (as 5 wt% SBR and 5 wt% CMC) as show in Fig. 3e. The CuO anode had the best cycling stability and the highest discharge capacity of 461.3 mAh g −1 after 50 cycles and the capacity retention ratio of CuO was about 86.85% that was better than our previous research of 66% [11]. So when making transi- tion metal oxides anodes of LIBs, SBR+CMC binder has bigger cohesion of active materials with the copper foil that was more suitable than PVDF binder. Similar result was reported by Yingjin Wei [6] at 2015; ZnFe 2 O 4 anode

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Cu/CeₓZr₁₋ₓO₂ catalysts for solid oxide fuel cell anodes

Cu/CeₓZr₁₋ₓO₂ catalysts for solid oxide fuel cell anodes

X-ray diffraction (XRD) was used to confirm the crystal structure of the oxides and investigate materials for unwanted large collections of copper species in the calcined powders. The machine used to collect the patterns was a Stoe STADI-P powder diffractometer which used a copper anode, producing monochromated x-rays at a wavelength of 1.5406 Å. Samples to be investigated were mounted on a sandwich of mylar discs greased with Vaseline. Readings were made by step-scanning with a step size of 0.1 o and a step counting time of 5 sec. The instrument contained a collimator, which is a device used to filter the X-rays so improving the resolution of the pattern obtained. The problem with excluding some of the X-rays is that the pattern obtained is less intense so such a device can only be used on a machine with a strong initial signal. The collimator had the effect of adding two peaks at 2 = 22 and 24 o which should therefore be discounted from the final pattern.

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Synthesis and catalytic activity of copper and iron oxide based catalysts in carbon dioxide methanation

Synthesis and catalytic activity of copper and iron oxide based catalysts in carbon dioxide methanation

sensitive towards chemical attack whilst reaction due to presence of hydrogen sulphide or mercaptan and reactivated these catalyst only using harsh chemicals. In order to reduce the cost, researchers need to seek out alternatives such as using other cheaper metal oxides or a combination of metal oxides that still produces similar and comparable results to the noble metal catalyst. To the best of our knowledge, no research clearly focused on combination of metal oxides (trimetallic catalyst) as catalyst based on transition metals with the aim for CO 2 conversion to CH 4 at low

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Antibacterial activity of Metal Based Nanoparticles–A Comparative view

Antibacterial activity of Metal Based Nanoparticles–A Comparative view

containing compounds such as et al., 2008). Complex action mechanisms of metals decrease the probability of bacteria . Owing to their high antibacterial properties, nanoparticles of silver, oxides of zinc, titanium, copper, and iron are the most commonly used nanoparticles in antimicrobial studies. Furthermore, these nanoparticles have been used to deliver other antimicrobial drugs to the site of pathological ). Bactericidal effect of metal nanoparticles has been attributed to their small size and high surface to interact closely with microbial ). The presence of nanoparticles in suspension would ensure continuous release of ions into the nutrient

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Rapid Sonochemical Synthesis and Characterisation of Copper Oxide Nanoparticles from Schweizer's Reagent

Rapid Sonochemical Synthesis and Characterisation of Copper Oxide Nanoparticles from Schweizer's Reagent

In the present paper, we report the synthesis of copper oxide nanostructures via a sonochemical technique that uses ultrasound irradiation as the driving mechanism in the process for Schweizer's reagent using ammonia as a base. The copper oxide nanostructures formed were subsequently investigated using advanced characterisation techniques such as X-ray diffraction (XRD) analysis to confirm the presence and type of copper oxides present, scanning electron microscopy (SEM) to determine particle size and morphology and UV- visible spectroscopy and Fourier Transform Infrared Spectroscopy (FT-IR) were used to monitor the formation of the nanostructures.

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Di­aqua­bis­(benzyl­oxyacetato)copper(II)

Di­aqua­bis­(benzyl­oxyacetato)copper(II)

Cu II ion, located on an inversion center, is hexacoordinated by four O atoms from two benzyloxyacetate ligands [Cu—O = 1.9420 (14) and 2.2922 (14) A ˚ ] and two water molecules [Cu— O = 2.0157 (15) A ˚ ] in a distorted octahedral geometry. In the crystal structure, intermolecular O—H O hydrogen bonds link the molecules into layers parallel to the bc plane.

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Anti-Fungal Activities of Thiosemicarbazones And Their Copper (II) Complexes

Anti-Fungal Activities of Thiosemicarbazones And Their Copper (II) Complexes

Thiosemicarbazones and their metal complexes have numerous biological applications. Most of the studies reported the biological activities of thiosemicarbazones and their metal complexes. But not much reports have been existing about the anti-fungal properties of thiosemicarbazones. In this present study we reported the anti-fungal properties of nine newly synthesized thiosemicarbazones and their copper (II) complexes. For this purpose, we examined the anti-fungal activity of thiosemicarbazones and their copper (II) complexes on Candida albicans and Candida trophicalis. All the thiosemicarbazones and their metal complexes has taken in four different concentrations. All the results obtained are presented in table and analyzed with the help of graphs.

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Copper(II) chloro­fumarate trihydrate

Copper(II) chloro­fumarate trihydrate

Experimental . A suitable single-crystal was carefully selected under a polarizing microscope and mounted in a glass capillary. The scattering intensities were collected on an imaging plate diffractometer (IPDS II, Stoe & Cie) equipped with a fine focus sealed tube X-ray source (Mo Kα, λ = 0.71073 Å) operating at 50 kV and 40 mA. Intensity data for the title compound were collected at 170 K by ω-scans in 180 frames (0 < ω < 180°; φ = O°, 0 < ω < 180°; φ = 90°, Δω = 2°, exposure time of 4 min) in the 2 Θ range 2.9 to 64.8°. Structure solution and refinement were carried out using the programs SIR92 (Altomare et al., 1993) and SHELXL97 (Sheldrick, 1997). The methylene H atom was placed in idealized position and constrained to ride on their parent atom, with C—H distances of 0.930 Å and U iso (H) values of

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Synthesis, Magnetic, Spectral and Biological Studies of Copper(II) Complexes of 4-Benzoyl-3-Methyl-1-Phenyl-2-Pyrazolin-5-One N(4)-Substituted Thiosemicarbazones

Synthesis, Magnetic, Spectral and Biological Studies of Copper(II) Complexes of 4-Benzoyl-3-Methyl-1-Phenyl-2-Pyrazolin-5-One N(4)-Substituted Thiosemicarbazones

The magnetic moment values for the mononuclear copper(II) complexes are close to spin-only value for one unpaired spin ( ∼ 1.7 B.M.) at room temperature. As magnetic susceptibilities of the complexes were not determined below room temperature, nothing can be said about the presence or absence of magnetic exchange. Dark green acetate complexes display a subnormal magnetic moment values (∼ 1.2 B.M.) at room temperature which suggests that the compounds have dimeric structures in which magnetic exchange takes place probably by means of overlap of the d x 2- y 2 orbitals and the spin exchange interactions between copper(II) ions may be explained on the basis of bridging by acetate ligand. A sulfur-bridged dimeric structure seems unlikely since sulfur-bridging leads to very strong antimagnetic interaction resulting in complete diamagnetism in copper(II) complexes.

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Synthesis, structural visualization, spectroscopic, and thermal studies of charge transfer Cu(II), Ni(II) and Zn(II) bromides-carbamide complexes at elevated temperature

Synthesis, structural visualization, spectroscopic, and thermal studies of charge transfer Cu(II), Ni(II) and Zn(II) bromides-carbamide complexes at elevated temperature

ESR and x-ray powder diffraction spectroscopy as well as thermal analysis TG/DTG/DSC. The Cu 2 (OH) 3 Br, [Ni 2 (NCO) 2 (H 2 O) 2 (Br) 2 ], and ZnCO 3 .xH 2 O compounds were achieved by a novel synthetic route through with a low cost precursor like carbamide. The infrared spectra of the results indicate absence of the individual bands of carbamide, but exhibited of the distinguished bands of hydroxyl, isocyanate, NCO, and ionic carbonate, CO 3 2– for Cu(II), Ni(II) and Zn(II)

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