Materials Literature
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The structure, electrical property, and magnetism of 7.5% V-doped ZnO powders that were hydrogenated annealed at 300, 500, and 700°C have been systematically investigated. The saturation magnetization and conductivity of the V:ZnO powders increase with hydrogenated annealing temperature (Tha), and the magnetization-te…
The thermal conductivity of molten NaCl and KCl was calculated through the Evans-Gillan nonequilibrium molecular dynamics (NEMD) algorithm and Green-Kubo equilibrium molecular dynamics (EMD) simulations. The EMD simulations were performed for a "binary" ionic mixture and the NEMD simulations assumed a pure system for…
The authors have examined the field effect behavior of nanocomposite field effect transistors containing ZnO (zinc oxide) tetrapods or nanocrystals dispersed in a polymer matrix of poly[2-methoxy,5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The electrical characteristics of ZnO tetrapods/MEH-PPV composite dev…
A set of Lindemann measures, based on positional deviations or return distances, defined with respect to mechanically stable inherent structure configurations, is applied to understand the solid-liquid phase transition in a Lennard-Jones-type system. The key quantity is shown to be the single-particle return distance-…
The authors present a simple and inexpensive method for fabricating a stable superhydrophobic engineering material surface using aluminum alloy and a suitable aqueous solution and time to control the surface roughness, which has a large water contact angle (>150°) and a large water sliding angle (>90°).…
Polycrystalline ZnO-based thin films with Li and/or Co doping have been prepared by a sol-gel spin-coating method on silicon substrates. Magnetization measurements reveal that Li-doped ZnO film shows paramagnetic behavior. However, the Co-doped ZnO thin films show obvious room-temperature ferromagnetic properties, and…
We study the critical behavior of magnetic thin films as a function of the film thickness. We use the ferromagnetic Ising model with the high-resolution multiple histogram Monte Carlo (MC) simulation. We show that though the 2D behavior remains dominant at small thicknesses, there is a systematic continuous deviation…
Dense lead telluride (PbTe) nanocomposites were prepared from PbTe nanocrystals synthesized employing an aqueous solution-phase reaction. This approach reproducibly synthesizes 100–150nm nanocrystals with a high yield of over 2g per batch. Densification using spark plasma sintering dimensionally integrated nanoscale g…
Epitaxial Ba0.5Sr0.5TiO3 thin films were prepared on Nb-doped SrTiO3 (100) substrates by the pulsed laser deposition technique and were studied by measuring the Ti 2p→3d resonant photoemission spectra in the valence-band region as a function of film thickness, both at room temperature and low temperature. The results…
We analyze the dissipation of the frequency vibrations of nano-mechanical devices. We show that the coupling between flexural modes and two-level systems leads to sub-ohmic dissipation. The inverse quality factor of the low energy vibrations depends on temperature as $Q^{-1} (T) \approx Q_0 + C T^{1/3}$, providing a q…
Graphene nanoribbon junction based electronic devices are proposed in this letter. Nonequilibrium Green’s function calculations show that nanoribbon junctions tailored from single layer graphene with different edge shapes and widths can act as metal/semiconductor junctions and quantum dots can be implemented. In virtu…
The optical transition energies (Eii) of single-walled carbon nanotubes (SWCNT) are influenced by the local environment created by solvents and adsorbed molecules. Analysis of SWCNT photoluminescence (PL) energies in various dielectric media is used to elucidate a semiempirical scaling relation for Eii shifts and nano…
The authors demonstrate a chiral photonic metamaterial with chirality provided by electromagnetic coupling between mutually twisted unconnected layers. In the visible and near-IR spectral ranges, the material exhibits polarization rotatory power of up to 2500°∕mm and shows relatively low losses and negligible circular…
The assessment of terminal ballistic performance has historically been strongly biased toward the penetration resistance of the target architecture and its component materials. However, penetration modeling alone does not provide sufficient knowledge to create new and/or improved armor ceramics materials capable of mi…
A combined analytical and experimental technique for determining explosive fragmentation ammunition safe separation distance and lethality without costly arena fragmentation tests is presented. The new methodology integrates high-strain high-strain-rate computer modelling with semi-empirical analytical fragmentation m…
The synthesis and characterization of Ga 1- x Mn x N thick layers are reported. The layers were prepared by the modified sublimation sandwich method (SSM) from GaN powder and powdered Mn sources and reacted with ammonia. Ga 1- x Mn x N layers having a current maximum size of 60 μm thickness and 10 mm × 10 mm area were…
Na−montmorillonite (Na-MMT) and its ion-exchanged derivatives (K-, Li-, Ca-MMT) were used to make nanocomposites by mixing with a low- T g styrene−acrylic latex, and these materials were used to verify the effects of counterions on nanocomposite morphology and mechanical properties. The monovalent cation clays form ex…
The adsorption of triphenyl phosphine (PPh 3 ) on colloidal silver has been investigated by means of surface-enhanced Raman spectroscopy (SERS). On the basis of surface selection rule, it is deduced from SERS results that PPh 3 adsorbs on silver surface via its P atom with three phenyl rings tilted with respect to the…
The study of thermogravimetric curves is commonly used to elucidate the likely processes involved during pyrolysis as well as determine the corresponding kinetic parameters. One of the main problems reported in the determination of such parameters is their ability to couple each other in such way that different sets o…
We have measured the time-resolved, X-ray excited optical luminescence spectra from two types of MgxZn(1-x)O core-shell, heterostructured nanowires: type I, with a small x, wurtzite core, encased in a larger x, wurtzite sheath; and type II, with a wurtzite core (x approximately 0), encased in a rock-salt sheath (x>0.6…