In this article, the structural, magnetic, and optical properties of (CUO) doped by cerium metal ions as a rare earth element synthesized by the hydrothermal method have been investigated. Various techniques such as X-ray diffraction (XRD) along with Rietveld refinement analysis, energy dispersive X-ray analysis (EDX), and field emission scanning electron microscopy (FESEM) have been used to investigate the crystalline and morphological properties. The results demonstrated that the samples crystallized in the form of polycrystalline and nanosheets with a monoclinic structure. Rietveld refinement of the sample showed sensible accord among the experimental data and standard (CUO) lattice constants. Also, the existing elements are evenly distributed on the surface of the sample and no impurity elements were observed in the material. By using UV-Vis absorption spectroscopy, the optical band gap of the sample was calculated at an acceptable value. To investigate the magnetic properties, a vibrating sample magnetometer (VSM) was carried out, which showed the weak ferromagnetic property of the Ce-doped sample.

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.

Incorporation of (CUO) into ZnO contributes to the formation of (CUO)/ZnO composite, thus enhancing some properties of individual oxides such as antibacterial and photocatalytic activities. The current study evaluated the effect of both synthesis and in-situ syntheses of copper oxide on the zinc oxide particles using Copper(II) nitrate trihydrate as the starting material as well as acetic acid, D200, SHMP, PVP, CTAB, SDS, urea, and M2P surfactants. The impact of surfactants on the microstructure and chromatic properties of the samples was also investigated. The results from scanning electron micrographs showed different morphologies of copper oxide particles in the forms of needle, round, and flake depending on the type of surfactant. Moreover, the chromatic properties of the powders showed that the pigment synthesized in the presence of SHMP was in a better and darker black color than the others. Further, copper oxide powders exhibited more proper anti-bacterial behavior than the copper oxide/zinc oxide composite powders. In addition, copper oxide/zinc oxide particles had higher photocatalytic activity (up to 95 %) than copper oxide powders (about 65 %).

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.