Preparation Of CuO Nanoparticles Research Articles

Preparation of CuO Nanoparticles for Improving Base Oil Properties


 
 
 
 Abstract
 Through this research, copper oxide nanoparticles were prepared via precipitation method using copper nitrate as a starting material. The resulting nanomaterial characteristics were diagnosed using available technologies such as AFM, XRD, B.E.T. surface area, pore-volume, pore size, and FTIR.
 For modern industries, lubricants are efficient materials for reducing friction between moving surfaces. CuO nanoparticles are used as an additive that is dispersed in an oil phase. Ultrasound technique was used to disperse the nanomaterial in Stocks 60 base oil, and the effect of the ratios of the added nanomaterial on the final properties of the oil was studied. A ratio of 0.5, 1, 1.5, and 2% was used and mixed with an approbate amount of oleic acid and was dispersed using ultrasound.
 The prepared copper oxide nanoparticles had an average particle size of 31.76nm and crystallinity of 93.63%. The surface area was around 27.61 m2 / g. Diagnostic tests were carried out on the oil, as it led to an increase in the viscosity index gave high stability and good dispersion of the nanomaterial for a long time, as the viscosity index was re-examined during successive periods. The final characterization of the oil shows a good improvement in the viscosity index of 110 and the flashpoint increased to 240 ° C. By increasing the viscosity index leading to ease movement inside the tools and contact surfaces oil will overcome the severe conditions during operations.
 
 
 
 

Preparation of CuO nanoparticles via organometallic chelate for the removal of acid red 57 from aqueous solutions

Preparation of CuO nanoparticles via organometallic chelate for the removal of acid red 57 from aqueous solutions

Preparation of CuO nanoparticles using Tamarindus indica pulp extract for removal of As(III): Optimization of adsorption process by ANN-GA

Cupric oxide nanoparticles (CuONPs) were prepared using Tamarindus indica pulp extract and characterized by UV–vis, FTIR, XRD, SEM and TEM analysis. The CuONPs was utilized as a nanoadsorbent for the removal of As(III) from the water. The effect of different process parameters viz. contact time, pH, initial As(III) concentration, CuONPs dose and temperature on the adsorption capacity of CuONPs and percentage removal of As(III) was investigated. Further, the process parameters were optimized through dynamic and interactive mathematical model viz. ANN-GA. Finally, maximum adsorption capacity was found to be 1152.5μg/g which was corresponding to the 99.4% removal of As(III) at ANN-GA optimized process parameters. The thermodynamic study revealed that the adsorption was spontaneous and endothermic. Adsorption process followed pseudo-second-order kinetics model. The equilibrium data followed the Langmuir isotherm model rather than the Freundlich model which indicated monolayer adsorption of As(III) on the energetically equivalent binding sites. The regeneration studies indicated that the uptake capacity of CuONPs decreases marginally after every adsorption-desorption cycle.

Fabrication and characterization PANI/CuO hybrid films by nebulizer spray pyrolysis technique for diode applications

Polyaniline was synthesized by chemical oxidized method and preparation of CuO nanoparticles using ethanol solvents by low cost sol–gel route. The prepared composite samples are equal ratio of PANI/CuO (1:1) were dissolved in m-cresol solvent and were coated on glass substrate by nebulizer spray pyrrolysis technique at different temperature (100°C, 150°C and 200°C). The obtained films have been characterized by Fourier transform infrared (FT-IR) spectroscopy, SEM, X-ray diffraction (XRD) and I–V characteristics. XRD study confirms the crystalline nature of CuO peaks and shows the CuO interaction with PANI structure. The SEM study shows glouber and granular particles on the surface of PANI/CuO films. FTIR spectrum reveals that the intensity of peak is increased with the increasing temperature of the sample. The higher temperature goes to deviate from the non linearity i.e. they tend toward non-ohmic behavior by I–V characteristics. The maximum conductivity obtained is 1.4×10−4S/cm at 200°C. I–V characteristics of ITO/PANI/CuO/PCBM/Al device show weak rectifying behavior with non-linear nature.

CuO nanoparticles with biostabilizers for the catalytic decolorization of bromocresol green, crystal violet, methyl red dyes based on H2O2 in aqueous medium

Ecofriendly biopolymers such as polyethylene glycol (PEG), carboxy methyl cellulose (CMC), starch (STA) were used as the stabilizers in the preparation of CuO nanoparticles. The sizes of CuOnps were characterized using XRD, FESEM and HRTEM measurements. The as synthesized CuOnps were used as the catalysts for the decolorization and mineralization reactions of an azo functional group containing dye (methyl red, MR) and triphenyl methylene functional group containing dyes such as bromocresol green (BCG), crystal violet (CV). In order to compare the catalytic activities of biopolymer stabilized CuOnps, a synthetic polymer, poly N-vinyl pyrollidone (PVP) stabilized CuOnp was also used as the catalyst. Pseudo-first order conditions were maintained and the kinetic parameters such as overall pseudo-first order rate coefficients, time of decolorization of 50 % decomposition and TOC values were determined. The trend in the catalytic activity for the decolorization of azo and triphenyl methylene dyes among the CuO catalysts tried was PEG > CMC > STA > PVP. Keeping the catalyst constant, the trend in the degradation rate constants among the dyes was MR > CV > BCG. The CuOnps synthesized with biostabilizers produced smaller particles and were found to be catalytically efficient.

Preparation of CuO Nanoparticles and Their Applications in Phase Change Composites

Preparation of CuO Nanoparticles and Their Applications in Phase Change Composites

Adsorption Behavior of Toxic Metal Ions on Nano-Structured CuO Granules

In this study, copper oxide nano particles were synthesized by batchwise supercritical hydrothermal method. After preparation of CuO nano particles, they were immobilized into the porous matrix of sodium alginate. The drying process formed a very porous structure that is useful for enhancing of adsorption activity. Produced CuO particles were characterized by X-ray diffractometery (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and BET for measuring the surface area. The prepared materials were then used as adsorbent in the removal of toxic metal ions in aqueous solution. To optimize the adsorption system, the effect of various parameters such as adsorbent type and dose, temperature, pH, and time on the adsorption were studied.

Preparation of CuO nanoparticles by metal salt-base reaction in aqueous solution and their metallic bonding property

This article describes a method for preparing CuO nanoparticles in aqueous solution, and a demonstration of feasibility of metallic bonding with the use of the CuO particles. Colloid solution of CuO nanoparticles was prepared from Cu(NO3)2 aqueous solution (0.01 M) and NaOH aqueous solution (0.019 M) at 5–80 °C. Leaf-like aggregates with an average size of 567 nm composed of CuO nanoparticles were produced at 20 °C. The size of leaf-like aggregates decreased with increasing reaction temperature. Metallic copper discs could be bonded using the CuO nanoparticles under annealing at 400 °C and pressurizing at 1.2 MPa for 5 min in H2 gas. A shear strength required for separating the bonded discs was 25.4 MPa for the CuO nanoparticles prepared at 20 °C, whose aggregates were the largest among the CuO particles examined. These results indicated that the formation of leaf-like aggregates of CuO nanoparticles led to efficient metallic bonding.

Application of Statistical Design Strategies to Optimize the Preparation of Cuo Nanoparticles by Hydrothermal Technique

Synthesis of CuO nanoparticles by hydrothermal technique in presence of cetyltrimethylammonium bromide (CTAB) as surfactant was carried out by statistically designed experiments based on Box Behnken method. Reaction parameters as time, temperature and surfactant concentration have been studied to show their effect on CuO particle size and morphology. The results of experimental design indicate that the surfactant concentration, reaction time and temperature were significant in. CuO particles were characterized using XRD and SEM. These work findings showed that CuO nanoparticles were formed at 100oC. On other hand, their crystallinity was improved with rising temperature from 100 to 200oC to achieve particle size of CuO in the range of 49-92 nm.

Preparation of CuO nanoparticles by microwave irradiation

CuO nanoparticles with an average size of ca. 4 nm have been successfully prepared by microwave irradiation, using copper (II) acetate and sodium hydroxide as the starting materials and ethanol as the solvent. The CuO nanoparticles are characterized by using techniques such as X-ray powder diffraction, transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy and UV–Visible absorption spectroscopy. The as-prepared CuO nanoparticles have regular shape, narrow size distribution and high purity. The band gap is estimated to be 2.43 eV according to the results of the optical measurements of the CuO nanoparticles.