a r t i c l e i n f o The degree of elasticity for the impact of a particle with a rigid wall is normally characterized with the restitution parameter, R. We examine such impact behavior of Cu nanoparticles with molecular dynamics simulations, for different particle sizes (1–15 nm in radius) and impact velocities (25–200 m s − 1). The impact can be ultra-elastic (R N 1) or inelastic (R b 1). Ul...

The design of catalytic materials for NOX removal by the selective reduction with NH3 (NH3-SCR) has been a focus research in field waste gas treatment. In this work, pitch-based activated carbon fibers (ACFs) were impregnated copper nitrate and cerium nitrate, then ACFs that loaded bimetallic nanoparticles (ACF@Cu/Ce) obtained after pyrolyzation performed. Moreover, ACF@Cu/Ce furtherly treated ...

The impact of gyrotactic microorganisms in the mixed convection stagnation point flow Cu-Al2O3/water hybrid nanofluid towards an immovable plate is numerically examined. boundary layer equation coupled with energy, nanoparticle volume fraction and conservation equations for are simplified into a set ordinary differential by adopting similarity transformation. validation results good agreement p...

In this study, we have proposed a new nanoparticle-containing test paper sensor that could be used as an inexpensive, easy-to-use, portable, and highly selective sensor to detect Cu(2+) ions in aqueous solutions. This disposable paper sensor is based on ZnO@ZnS core-shell nanoparticles. The core-shell nanoparticles were synthesized using a chemical method and then they were used for coating the...

Atomic-level understanding of the structural transformations of multimetallic nanoparticles triggered by external stimuli is of vital importance to the enhancement of our capabilities to fine-tailor the key structural parameters and thereby to precisely tune the properties of the nanoparticles. Here, we show that, upon thermal annealing in a reducing atmosphere, Au@Cu2O core-shell nanoparticles...

Copper sulfide is a promising p-type inorganic semiconductor for optoelectronic devices such as solar cells, due its small band gap energy and its electrical properties. In this work nanocrystalline copper sulfide (Cu x S), with two stoichiometric ratios (x = 2, 1.8) was obtained by one-pot synthesis at 220, 230, 240 and 260 °C in an organic solvent and amorphous Cu x S was obtained in aqueous ...

Photoactive Cu-containing ZnO-ZnAl2O3 nanocomposites were synthesized by the polymer-salt method. To study structure and properties of materials, methods luminescent spectroscopy X-ray phase analysis used. It has been shown that resulting are capable photogeneration singlet oxygen under action UV blue light. The materials consist nanosized hexagonal ZnO crystals cubic ZnAl 2 O 4 doped with Cu. ...

Driven by the motivation for optimizing Cu radiolabeling efficiency of nanoparticles for in vivo positron emission tomography (PET) imaging, a new strategy has been developed. This strategy involved a complete redesign of the nanoparticle system, utilizing macromolecular precursors that were preloaded with labeling sites and programmed for supramolecular assembly into discrete, functional nanos...

Different proportions of oxide-rich PdCu/C nanoparticle catalysts were prepared by the NaBH4 reduction method, and their compositions were tuned by the molar ratios of the metal precursors. Among them, oxide-rich Pd0.9Cu0.1/C (Pd:Cu = 9:1, metal atomic ratio) exhibits the highest electrocatalytic activity for ethanol oxidation reaction (EOR) in alkaline media. X-ray photoelectron spectroscopy (...

A numerical simulation model for laminar flow of nanofluids in a pipe with constant heat flux on the wall was built to study the effect of the Reynolds number on convective heat transfer and pressure loss. The investigation was performed for hybrid nanofluids consisting of CuO-Cu nanoparticles and compared with CuO and Cu in which the nanoparticles have a spherical shape with size 50, 50, 50nm ...