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abstract sensitive and precise voltammetric methods for the determination of trace amounts of furaldehydes, mainly as furfural (f) and 5-hydroxymethyl-2-furaldehyde (hmf), in waste waters and other matrices is described. determination of total furaldehyde at < ?g g-1 levels in alkaline buffered aqueous media was individually investigated. by the use of ordinary swv and adsorptive square wave ...
The results of full study X-ray photoelectron spectra (XPS) spin-liquid candidate CuAl 2 O 4 including the measurements high-energy resolved core level (Cu $$2p$$ , Al $$3p$$ $$1s$$ ), Cu LMM Auger and valence band are presented. comparison obtained with reference samples specially performed density functional theory calculations has confirmed a finite site-disorder in where about 30% 2+ ions o...
In this work electrodeposited Ni-Cu/Cu metallic multilayered films with different thicknesses of Ni and Cu were prepared on (100) polycrystalline Cu substrates. The nanostructure of the multilayers was studied using XRD. The existence of satellite peaks in the XRD patterns showed that the multilayered films have superlattice structures. The difference between the intensity of ML(200) and ML(11...
abstract part one: the electrode oxidation potentials of a series of eighteen n-hydroxy compounds in aqueous solution were calculated based on a proper thermodynamic cycle. the dft method at the level of b3lyp-6-31g(d,p) was used to calculate the gas-phase free energy differences ,and the polarizable continuum model (pcm) was applied to describe the solvent and its interaction with n-hydroxy ...
Orientation-selective DEER (Double Electron-Electron Resonance) measurements were conducted on a series of rigid and flexible molecules containing Cu(ii) ions. A system with two rigidly held Cu(ii) ions was afforded by the protein homo-dimer of copper amine oxidase from Arthrobacter globiformis. This system provided experimental DEER data between two Cu(ii) ions with a well-defined distance and...
The effects of particle composition on heterogeneous catalysis were studied using dendrimer-encapsulated nanoparticles (DENs) as precursors to supported Pt-Cu catalysts. Bimetallic Pt-Cu DENs with varying Pt/Cu ratios were prepared in an anaerobic aqueous solution and deposited onto a high-purity commercial alumina support. The dendrimer template was then thermally removed to yield supported na...
background the altered levels of some essential trace elements and antioxidant minerals have been observed in diabetic patients. objectives the aim of the present study was to compare the concentrations of essential trace elements, copper (cu), zinc (zn), and iron (fe) in the serum of patients who have type 2 diabetes mellitus (t2dm) with those of their non-diabetic first-degree relatives (fdr)...
Tribological behavior of Cu-MoS2 and Ag-MoS2 nanocomposite lubricant was studied. Cu nanoparticles produced by electrical explosion of copper wires and Ag nanoparticles prepared by electrospark erosion were employed as metal cladding modifiers of MoS2 nanolamellar particles. The tribological tests showed Cu-MoS2 and Ag-MoS2 nanocomposite lubricants changed the friction coefficient of the initia...
Speciation of copper in the electrokinetic treatments of an industrial sludge was studied by in situ extended X-ray absorption fine structural (EXAFS) and X-ray absorption near-edge structural (XANES) spectroscopies in the present work. The least-square fits (LSF) of the XANES spectra indicated that the main copper species in the sludge were Cu(NO)(3) (82%) and adsorbed copper (Cu/SiO(2)) (17%)...
ni-co/cu multilayers have been grown by electrodeposition method from a single electrolyte (based on ni(so4).6h2o, co(so4).7h2o, cu(so4) and h3bo3) using galvanostatic control on titanium sublayers. the x-ray diffraction (xrd) patterns confirmed the multilayered structure with the nanometer thicknesses. also, electron diffraction x-ray (edx) analysis confirmed the purity of deposited samples. ...
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