Electrochemical properties of various rock-shaped-CUO/graphite (G) composites and monoclinic structure CUO nanoparticles as the cathode versus a zinc plate as the anode in a 4M NaOH electrolyte were elucidated by electrochemical impedance spectroscopy (EIS) and chronopotentiometry (CP) in a two electrode configuration cell.Various values of G 9, 16 and 28 wt% were prepared and studied as cathode materials for an alkaline Zn-CUO Battery. The EIS results demonstrated that increasing the mass ratio of G caused significant decrease in charge transfer resistance (Rct) and capacitive behavior of the electrode. Also, the discharging voltage of the cells was increased due to raising the mass ratio of the graphite. Besides, electrochemical properties of the monoclinic structure CUO nanoparticles as cathode material in the alkaline battery was compared with a rock shaped CUO particles. The results showed that the discharged voltage of monoclinic CUO nanoparticles is less than another rock shaped CUO nanoparticles form.

An empirical electrical conductivity assessment of nanofluids comprising CUO nanoparticles water-based in different concentrations, particles size and various temperatures of nanofluids has been carried out in this paper. These experimentations have been done in deionized water with nanoparticles sizes such as 89, 95, 100 and 112 nm and concentrations of 0.12 g/l, 0.14 g/l, 0.16 g/l and 0.18 g/l so nanofluids obtain in temperatures such as 25oC, 35oC, 45oC and 50oC for investigation of their electrical conductivity. It is observed that, in water-based nanofluids, the electrical conductivity increases with increasing in both nanofluids temperatures and concentration respectively in the range 25-50oC and 0.12-0.18g/l. But in nanoparticles size rising in nanofluids we observe that electrical conductivity has a few increase when nanoparticles have 95nm diameters, so decrease for biggest nanoparticles such as 100 and 112nm. It seems that there is an optimum in electrical conductivity with resize of nanoparticles.

Copper oxide and nickel oxide-copper oxide (NiO-CUO) metal oxide nanoparticles were prepared by co-precipitation method in aqueous solution using sodium hydroxide as precipitating agent and Cetyl Trimethyl Ammonium Bromide (CTAB) as a surfactant. The particles were characterized by XRD, SEM, EDS and FTIR analysis. The crystallite sizes of both metal oxide particles were in the nano range calculated by Debye-Scherrer equation. The prepared metal oxide nanoparticles were employed for the fabrication of zinc-composite coating on mild steel by electroplating and their corrosion behaviour was investigated by Tafel and Electrochemical impedance spectroscopy in corrosive media of 3. 5% NaCl solution. The surface morphology of coated steel articles and also their corrosion morphology have been characterized by scanning electron microscopic (SEM) images.

In this work, CUO nanoparticles (CUO NPs) was prepared by a simple and green method using Rosmarinus officinalis extract containing phenolic constituents as both the chelating and the stabilizing agents. CUO nanoparticles/polyorthoaminophenol composite (CUO NPs/POAP) as electro-active electrodes for electrocatalytic oxidation of methanol with good uniformity are prepared by electropolymerization. Composite of CUO NPs/POAP was synthesized by cyclic voltammetry (CV) methods and electrochemical properties of film were investigated by using electrochemical techniques. New composite modified electrode shows a significantly high response for methanol oxidation. This method of synthesis of the catalyst and composite has the advantages of high yields, elimination of chemical reagent and simple methodology. Catalytic efficiency remains unaltered even after several repeated cycles.

The preparation of trans-dihydrofurans has been achieved by a one-pot condensation reaction of 4-bromophenacyl bromide, aromatic aldehydes and 5, 5-dimethyl-1, 3-cyclohexanedione using biosynthesized CUO nanoparticles under reflux conditions in ethanol. CUO nanoparticles (CUO NPs) were prepared using extract of leaves of Ajuga chamaecistus Subsp. Scoparia. The key advantages of this process are the diastereoselective synthesis, reusability of the catalyst, low catalyst loading, excellent yields, short reaction times, simple workup and environmentally benign. Fully optimized structures of trans and cis dihydrofurans were obtained by B3LYP/6-31G(d, p) method. The structures of the prepared trans-2, 3-dihydrofurans were fully characterized by 1H and 13C NMR spectra, IR spectra, and elemental analysis.

In this research, the synthesis of copper oxide nanoparticles was performed using Cu(acac)2 precursor. Copper oxide nanoparticles were synthesized by combustion method. Identification of synthesized nanomaterials was performed using PXRD (powder X-ray diffraction) technique. The physical properties of synthesized materials were also evaluated using UV-Vis (ultraviolet-Visible), FT-IR analyzes. It also examined the size and morphology of the materials through the FESEM (scanning electron microscopy field) and TEM (transient electron microscopy). The energy band gap of nanomaterials was studied, with an optical band gap of about 4. 58 eV. An electrochemical sensor was developed using nanoparticles that the sensor is capable of bisphenol A breaks down. The results of this sensor seem to be desirable and suggest that the oxidation peak potential of the bisphenol A at a surface of CUO nanoparticle modified carbon paste electrode (CUO/NPs/MCPE) appeared at 450 mV that was about 60 mV lower than the oxidation peak potential at the surface of the carbon paste electrode (CPE). At a best condition in voltammetric analysis, the oxidation peak current of bisphenol A showed linear dynamic range (in 0. 1– 400 μ M) with a detection limit of 0. 067 μ M, using square wave voltammetry (SWV) method. The CUO/NPs/MCPE was successfully applied for the analysis of bisphenol A in food samples.

Recent studies show that nanoparticles of copper and copper compounds are effective antibacterial agents. Unlike silver, copper is an essential element for human health although in excess amount it has undesirable effects. In this study, the spherical structure of CUO nanoparticles was synthesized in the large mordenite matrix with solid-state reaction method. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Transmission electron microscopy, Scanning electron microscope and BET. XRD results revealed diffraction peaks for each of the two compounds in the nanocomposite. In the FT-IR spectra, all bands in nanocomposite sample show a shift with respect to that of the matrix, indicating that the CUO is incorporated in the matrix. Transmission electron microscopy images showed small spherical nanoparticles belong to CUO nanoparticles with maximum diameter 22 nm. The zone diameters of CUO-large mordenite nanocomposite were 14 mm for Gram-negative (E. coli) and Gram-positive (S. aureus) bacteria.

In the present paper laminar flow forced convective heat transfer of CUO/water nanofluid in a triangular duct under constant wall temperature condition is investigated numerically. Sometimes, because of pressure drop limitations the need for noncircular ducts arises in many heat transfer applications. We used nanofluid instead of pure fluid because of its potential to increase heat transfer of system. In this paper, the effect of parameters such as nanoparticles diameter, nanoparticles concentration, type of nanoparticles and heat transfer comparison between nanofluid and pure fluid is studied. Comparison of convective heat transfer of nanofluid in isosceles triangular ducts with various apex angles is also presented. In this study, for the presence of nanoparticles, the dispersion model and for solving differential equations, the finite difference method is used. Numerical results indicate an enhancement of heat transfer of fluid with changing to the suspension of nanometer-sized particles in the triangular duct. Results also defined that equilateral triangular duct has a maximum heat transfer in comparison with other types of isosceles triangular duct.