Materials Literature
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Abstract A novel indium‐boron (In–B) amorphous alloy was prepared by chemical reduction of indi‐ um(III) ions [In 3+ ] with borohydride [BH 4 − ] in aqueous solution and was applied to the water‐medium Barbier‐type allylation reactions. A variety of allyl halides could be efficiently added to aldehydes or ketones in w…
Localized structures forming in the bistable regimes in a chain of weakly coupled split ring resonators, which are the building blocks of a nonlinear magnetic metamaterial, where electric current is generated by external electromagnetic radiation, have been studied analytically and numerically. The hysteresis of the v…
The elastic moduli and propagation velocities of elastic waves in 2D supracrystalline nanoallotropes of carbon have been calculated. It has been shown that these velocities in sp 2 nanoallotropes are close to those in graphene and exceed the propagation velocities of elastic waves in single-crystal diamond by a factor…
According to first-principles density functional calculations, we have investigated the magnetic properties of Mn-doped GaN with defects, Ga 1− x − y V G x Mn y N 1− z − t V N z O t with Mn substituted at Ga sites, nitrogen vacancies V N , gallium vacancies V G and oxygen substituted at nitrogen sites. The magnetic in…
There is no known fundamental limit to the performance of thermoelectric materials as characterized by the dimensionless figure of merit, ZT, and in fact there has been significant recent progress in improving the performance of practical materials. Here we discuss some of the issues involved in improving ZT starting…
Time-resolved photoluminescence measurements of silicon nanocrystals formed by ion implantation of silicon into silicon dioxide reveal multi-exponential luminescence decays. Three discrete time components are apparent in the rise and decay data, which we associate with different classes of nanocrystals. The values of…
Potentiodynamic polarization and linear polarization resistance electrochemical techniques were used to assess the corrosion behavior of Ni20(% wt.)Cr, NiCrAl, NiCrAlY2O3, NiCrAlCoY2O3 and Cr2C3-Ni20Cr metallic coatings in simulated body fluid environment. Hank´s solution was used for simulating body fluid environment…
Graphene-based nano-objects such as nanotrenches, nanowires, nanobelts and nanoscale superstructures have been grown by surface segregation and precipitation on carbon-doped mono- and polycrystalline nickel substrates in ultrahigh vacuum. The dominant morphologies of the nano-objects were nanowire and nanosheet. Nucle…
Cooling heterojunctions on LaAlO3 substrates or thick layers of LaAlO3 on SrTiO3 substrates below 820 K lead to a ferroelastic phase transition Pm3−m→ R3−c in LaAlO3, with extensive twinning and elastic softening. Twin boundaries add to structural disorder near the heterojunction and generate partially localized carri…
33 mol % Na 2 O · 67 mol % SiO 2 + x B 2 O 3 (GeO 2 ) glasses and melts with x = 0 and 20 mol % are studied by high-temperature Raman spectroscopy. The laws of formation of the anion structure of glasses and melts of borosilicate and germanate-silicate systems are shown to be different. The dominant anion groups in th…
We performed first-principles calculations to study the electronic and magnetic properties of Cu-doped ZnO nanowires. It is found that the isolated Cu dopant is spin polarized with a magnetic moment of 0.56μ B and prefers to substitute for the outermost surface Zn site in ZnO NW. At a higher doping concentration, the…
Electrical, optical or catalytic properties of ceria can be tuned via doping by rare earth elements. The innate properties of ceria-based materials can be further amplified by using nanostructured ceria. In this study, Sm-doped ceria (SDC) coatings were grown on the FTO glass substrate by means of cathodic deposition.…
To achieve early-stage diagnosis, a high-sensitivity assay method is needed. As a biomarker, vascular endothelial growth factor (VEGF) has played a growing role in diagnosing and treating hepatocellular carcinoma (HCC). In this work, an immunomagnetic reduction (IMR) through bio-functionalized magnetic nanoparticles a…
The triatomic and tetratomic gas molecule adsorption effects on the electrical conductivity of graphene are investigated by the tight-binding model, Green's function method, and coherent potential approximation. We find that the electrical conductivity of graphene sheet is sensitive to the adsorption of these gases.
A magnetoelectric (ME) bending-mode structure based on Metglas/Pb(Zr,Ti)O(3) fiber laminates has been studied. This bending mode had a fundamental resonance (FBR) of about 210 Hz, which was much lower than that of the longitudinal mode. Near the FBR, the ME voltage coefficient was about 400 V/cm·Oe. Magnetic sensors b…
Lithium stannate (Li2SnO3) was prepared by solution evaporation method utilising acetates of tin and lithium as starting materials. From thermogravimetric analysis, no weight loss was observed at temperatures above 800°C. The Li2SnO3 precursor was then sintered at 800°C for 5, 6, 7, 8 and 9 h, respectively. X-ray diff…
For the application of carbon nanotubes (CNT) as interconnects in integrated circuits low temperature vertically aligned growth with a high tube density is required. We found that etching and cleaning steps used in semiconductor technology can damage the catalyst or support layer, preventing low temperature aligned CN…
In this paper we study the behaviour of the order parameter of the nematic phase for all temperatures of the phase: from the neighbourhoods of the nematic crystalline phase transition region to the neighbourhoods of the nematic isotropic phase transition region. To do this, we use experimental birefringence data and t…
The temperature-concentration dependence of the electrical conductivity of glasses in the Na2SO4-NaPO3 and Na2O-P2O5 systems has been investigated. Based on the obtained experimental data (IR spectra, density, microhardness, sound velocity, and paper chromatography), it has been demonstrated that SO 4 2− ions form ter…
The electron field emission (EFE) properties of diamond films were markedly improved by Fe-coating and postannealing processes. Transmission electron microscopy examination indicated that the possible mechanism of enhancing the EFE behavior is the reaction of the Fe layer with diamond and the reprecipitation of the di…