Materials Literature
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We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field E(t) using Boltzmann’s transport equation to derive the current-density. A negative differential conductivity (NDC) is predicted in quasi-static approximation i.e., ωτ 0 is equal to th…
This work deals with the influence of heat treatment on microstructure and tribological properties of specimen cast assigned as a material used for frogs in railway crossovers. Materials used nowadays in the railway industry for frogs: Hadfield cast steel (GX120Mn13) and forged pearlitic steel (R260) do not fulfil str…
The formation of FeCo alloy nanoparticles embedded in a highly ordered 3D cubic mesoporous silica matrix (SBA-16) was thoroughly studied using several techniques. In particular, the selectivity of Extended X-ray absorption fine structure and X-ray absorption near-edge structure spectroscopy at both the Fe and Co K-edg…
The influence of temperature and applied magnetic fields on photoluminescence (PL) emission and electronic energy transfer (ET) of both isolated and aggregated CdSe nanocrystals was investigated. Following 400-nm excitation, temperature-dependent, intensity-integrated and energy-resolved PL measurements were used to q…
We discuss the calcination-free liftoff photolithography of inorganic phosphor films consisting of two kinds of rare-earth-ion-doped (RE) nanoparticles dip-coated onto plastic sheets. Green and red upconversion luminescence were emitted from the RE-nanoparticles prepared from Y₂O₃ nanoparticles doped with 1 mol% Er³⁺…
The synthesis of gold nanorods is commonly performed via seed-mediated growth processes, where typically tetrachloroaurate(III) is reduced with ascorbic acid in the presence of a surfactant (CTAB). However, in most cases nanorods with average aspect ratios below 4 are obtained, and reproducible processes which lead to…
Relatively little is known about structural transformations of very small metal clusters that result from the adsorption of molecules. Here, the ligand-induced structural transformation of Ag(5)(+)(g) by 1,4-cyclohexadiene, which is capable of binding metal clusters as a bidentate ligand, is investigated using equilib…
In this paper results of the characterization by SEM and TEM of Zr-1wt% Nb-0, 05wt% Fe with 200 ppm of hydrogen are presented, as well as the results of tensile tests at 300°C and room temperature to determine the pre-irradiation yield stress and ductility. The results are compared with hydrided Zr-2,5wt% Nb with the…
The gyroid structure with its interesting and mysterious symmetry has attracted the great attention of scientists with a variety of backgrounds. Constituting the gyroid structure through a precise control of the (macro)molecular architecture and the properties of its building blocks is a challenge. In this work we rep…
A red phosphor CaAl12O19: Mn4+ was prepared utilizing the redox of metal nitrates and urea by combustion synthesis with ignition temperature of 700°C. This phosphor can be used in white LED. The shape and surface morphology of the phosphor were controlled by changing the dosage of ammonium nitrate (NH4NO3). The sample…
For a weak polyelectrolyte brush swollen in electrolyte solution, we obtain an analytical description of the change produced by curvature deformation. Expressions are given for elasticity constants and for the change in the thickness and concentration profiles of a box-like brush in equilibrium with an external reserv…
The mechanism of penetration of the jet in silicon carbide had been investigated experimentally and numerically. In contrast to of metals, the penetration of shaped-charge jet into ceramics has an anomalous character and a smaller depth of penetration. The penetration into ceramics is accompanied by a radial interacti…
The optical response of multibranched gold nanoparticles is studied by means of electron energy-loss spectroscopy (EELS) in aberration corrected STEM mode. In every case the plasmon response is constant and variations in the maxima positions were found to be dependent on the branches aspect ratio. The good spatial res…
The article consists test results of direct extrusion AZ80A & ZK60A magnesium alloys. Extrusion process was conducted in the temperature range 350 C-450 C at different extrusion speeds (ram speed 0.8 mm/s and 2.8 mm/s). In order to find optimum precipitation strengthening parameters the aging curves have been made. Ex…
A demagnetized Nd-Fe-B permanent magnet was scanned in the strong magnetic field space just above the magnetic pole containing a HTS bulk magnet which generates the magnetic field 3.4 T. The magnet sample was subsequently found to be fully magnetized in the open space of the static magnetic fields. The finite element…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation V. D. Mote, V. R. Huse, Y. Purushotham, S. S. Shah, B. N. Dole; Synthesis and characterization of…
Results are presented on synthesis and crystal growth of Gd2S3-Dy2S3 solid solution sulfides and study of their thermoelectric properties in the range of temperatures 80-400 K. Gd0.2Dy0.8S1.48 composition has the best values of thermoelectric efficiency 0.39 x 10-3/K at 400 K.
The electrochemical formation and dissolution of a lead/copper surface alloy on Cu(100) in chloride-containing electrolyte solutions were studied on the atomic scale by in situ scanning tunneling microscopy with high temporal and spatial resolution. Alloy formation, induced by a negative potential sweep, starts predom…
The kinetic study on the effect of O2 concentration in the selective catalytic reduction (SCR) of nitrogen oxide (NOx) by ammonia (NH3) was systematically carried out at temperatures below 200 °C over Fe- and Cu-loaded beta zeolites. The large difference was observed in the effect of O2 concentration over the two cata…
Spinel ferrites of composition Zn 0.6 Mn 0.4 Fe 2 O 4 and Li 0.2 Zn 0.2 Mn 0.4 Fe 2.5 O 4 were prepared by the self-combustion sol-gel method. The samples were heat-treated in different atmospheres and temperatures, producing different effects on their morphological and structural properties. The resulting products of…