Materials Literature
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The comprehension of conduction mechanisms in single-walled carbon nanotubes is a crucial task for developing efficient nanodevices. Appealing hybrid architectures could exploit charge transport perpendicular to the main nanotube axis in order to minimize carrier path and phonon scattering effects. Such transverse tra…
The structure of the intrinsic coordination defects in amorphous $\mathrm{Si}{\mathrm{O}}_{2}$---namely, a nonbridging oxygen and a threefold-coordinated silicon---is studied using a modern ab initio method, aiming at elucidating their actual structure and possibly their contribution to mass transport. We show that th…
This work explores the effectiveness of the three-dimensional Ehrlich-Schwoebel (3D ES) barrier in the selection of textures during nanorod growth. The authors use molecular dynamics simulations to show that the 3D ES barrier, together with geometrical shadowing and the thermal dynamics of surface faceting, defines th…
Emission signal from fluorescent molecules (fluorescein-5-maleimide) in a porous silicon mirror is enhanced by tuning the pore size and reflectance spectrum of the porous silicon multilayer structure. This is achieved when the reflectance spectrum of the silicon mirror overlaps the fluorescent excitation and emission…
In this document, after a review of the accidents/incidents, are described the different interactions between hydrogen gas and the most commonly used materials including the influence of internal and external hydrogen, the phenomena occurring in all ranges of temperatures and pressures and Hydrogen Embrittlement (HE)…
Zinc oxide tetrapod powders with high luminescent characteristics have been grown by simple evaporation and direct oxidation of zinc. Their structural and optical properties have been studied by transmission electron microscopy and by cathodoluminescence. The legs of the tetrapods have a pure hexagonal structure and f…
We report a novel stepwise layer-by-layer synthesis strategy to achieve multi-component barcode nanospheres that contain magnetic nanoparticles (MNPs) as the core and quantum dots (QDs) of different emission colors in spatially separated silica layers as the shells, with QD-free silica layers as the insulation layers.…
In order to study the mechanism and parameters of hydrogen diffusion in the hexagonal (C14-type) Laves-phase $\mathrm{Zr}{\mathrm{Mn}}_{2}$, we have performed quasielastic neutron scattering measurements for $\mathrm{Zr}{\mathrm{Mn}}_{2}{\mathrm{H}}_{3}$ over the temperature range $10--390\phantom{\rule{0.3em}{0ex}}\m…
We investigated the electrical and magnetic properties of cobalt-substituted manganese-zinc soft ferrite by using the equivalent lumped elements acquired from the appropriate equivalent electrical circuit of polycrystalline ferrite. We applied the equivalent lumped circuit, combined with equivalent lumped resistances…
We demonstrate the broadband optical amplification in bismuth-doped strontium germanate glass with 808 nm and 980 nm laser diodes (LDs) as excitation sources. The net optical gain has been obtained within the wavelength region of 1272 to 1348 nm with 808 nm laser diode under 0.97 W power. The maximum gain and gain coe…
The triple-level data storage capability of the phase change memory with doublelayer chalcogenide films (Sb2Te3 and Ge2Sb2Te5) was investigated. Differences in physical properties of these two chalcogenide materials contribute to the appearance of a median resistance state. However, the stable median resistance state…
We report on experiments and theory of resonant tunneling anisotropic magnetoresistance (TAMR) in AlAs/GaAs/AlAs quantum wells (QW) contacted by a (Ga,Mn)As ferromagnetic electrode. Such resonance effects manifest themselves by bias-dependent oscillations of the TAMR signal correlated to the successive positions of he…
A facile and reproducible approach for the synthesis of magic-sized CdSe and CdTe nanocrystals is established. The as-synthesized CdSe nanocrystals exhibit strong and fixed absorption features with unusually narrow emission spectra. White-light emission can be achieved by two different routes. One is to mix colours em…
We present the design, growth, fabrication, integration and characterization of alternative hybrid white light sources based on the controlled layer-by-layer assembly of nanocrystals on UV-emitting nitride diodes for adjustable white light parameters. We hybridize CdSe/ZnS core–shell nanocrystals of different sizes (1…
This study was conducted to investigate the effect of sequential and direct detergent methods on the monosaccharide composition of acid detergent residues in three fi brous feedstuffs (lignifi ed, highly digestible and highly pectic). The result indicated that the contents of ADF and cellulose determined by the sequen…
The role played by the alpha-helix in determining the structure, the stability and the unfolding mechanism of azurin was addressed by studying a helix-depleted azurin variant produced by site-directed mutagenesis. The protein structure was investigated by CD, 1D (1)H NMR, fluorescence spectroscopy measurements and MD…
The capture of an electron by a silicon atom in a defect-free bulk of amorphous silica $(a\text{\ensuremath{-}}{\mathrm{SiO}}_{2})$ has been investigated. Ab initio constrained dynamics has been applied to evaluate the energy barrier. The computed energy barrier involved in the mechanism was found to be $0.23\phantom{…
Macromolecule-protected sub-micrometer polyhedral gold nanocrystals have been facilely prepared by heating an aqueous solution containing poly (N-vinyl-2-pyrrolidone) (PVP) and HAuCl4 without adding other reducing agents. Scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), ultraviolet-visib…
Rapid synthesis of sodium‐substituted lanthanum manganite phases is reported by the solution combustion method using oxalyl dihydrazide (ODH), as fuel. As‐synthesized compounds are amorphous in nature; crystallinity was observed on heating at 800°C for 5 min. Structural parameters were determined by the Rietveld refin…
We propose an approach to allocate and delimit a region in which the rotational losses are of most importance in the stator core of induction motors. The delimitation is based on the analysis of points at which the minimum flux density is not null. The analysis of flux paths and values of flux density over a number of…