Materials Literature
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We report that Fe sheathed LaFeAsO 0.9 F 0.1 wires with Ti as a buffer were fabricated by the powder-in-tube (PIT) method for the first time. Compared to the common two-step vacuum quartz tube synthesis method, the PIT method is more convenient and safe for synthesizing the novel iron-based layered superconductors. St…
The breakdown mechanism of compressed SF 6 in gas insulation is known to be controlled by stepped leader propagation. This process is reasonably well understood for strongly non-uniform insulation gaps ('point-to-plane') and in the absence of pre-breakdown discharge activity ('corona stabilization'). Open questions st…
Abstract The growth of ZnO nanorods by electrodeposition from oxygenated aqueous mixture of zinc chloride and potassium chloride is studied experimentally as a function of the deposition time, zinc concentration and the substrate. These parameters influence markedly the characteristics of the deposits (rod density, as…
Abstract A series of samples with different content of multi‐walled carbon nanotubes (0.5‐7.5 wt%) in polycarbonate was investigated by electrical conductivity measurements. During isothermal annealing of the as‐produced samples in the melt state an increase of the conductivity with time was observed. A similar conduc…
Progressive accumulation of stress-induced martensite during cyclic loading of NiTi shape memory alloys results in both structural and functional fatigue. We present experimental data demonstrating that periodic annealing of the fatigued samples above the austenite finish temperature (‘healing’) retransforms the resid…
La 3+ and V 5+ co-doped Bi 0.85 La 0.15 Fe 1− x V x O 3 (BLFV x , x = 0–0.1) ceramics were prepared by a rapid liquid sintering technique. The effects of the V 5+ -doping content on the structure and electrical properties of BLFV x ceramics were investigated. In the range of the V 5+ content x from 0 to 0.03, BLFV x c…
In this paper, we demonstrate postprocessing techniques to adjust the threshold voltage ($V_{t}$) and on–off ratio ($I_{{ON}}/I_{{OFF}}$) of multiple-tube carbon nanotube field effect transistors (CNFETs). These postprocessing techniques open up an additional degree of freedom to further tune individual CNFETs in addi…
We use neutron scattering to study the structural distortion and antiferromagnetic (AFM) order in ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ as the system is doped with fluorine (F) to induce superconductivity. In the undoped state, LaFeAsO exhibits a structural distortion, changing the symmetry from tetragon…
We introduce and demonstrate a compact, nonmechanical beam steering device based on liquid Crystal (LC) Polarization Gratings (PGs). Directional control of collimated light is essential for free-space optical communications, remote sensing, and related technologies. However, current beam steering methods often require…
A two dimensional design of an ultra-thin, wide-angle perfect absorber for infrared light is proposed. The geometry of the structure is simple enough to be realized with present fabrication techniques, yet it is shown numerically to exhibit nearly 100% absorption at the resonant wavelength that is tunable by adjusting…
Utilizing the peritectic reaction and the miscibility gap featured in the pseudo-binary phase diagram of Mg2Si and Mg2Sn, we fabricated environmentally friendly Mg2(Si, Sn) thermoelectric (TE) composites in which the Mg2Si-rich bulk grains were in situ coated by Mg2Sn-rich thin layers. The Mg2Sn-rich grain boundary ph…
This is a study for the comparison of existing test methods for measuring the density of natural fibres to be used as reinforcement in biocomposite materials. Normally, any such method is evaluated by referring to its accuracy, cost, speed of test result (i.e. how quick a method is to give the result), and whether it…
We present a novel approach to construct hollow polymeric microcontainers that can be remotely addressed using a low-power near-infrared laser to release encapsulated materials. Microshells possessing walls with aggregates of gold nanoparticles are found to release encapsulated materials upon near-IR irradiation, whil…
We have designed new nanoprobes applicable for both positron emission tomography (PET) and optical fluorescence in vivo imaging. Fluorine-18, which is commonly used for clinical imaging, has been coupled to phospholipid quantum dot (QD) micelles. This probe was injected in mice and we demonstrated that its dynamic qua…
Polymer electrolytes were obtained by the casting technique from a solution containing chitosan, hydrochloric acid, and plasticizer such as glycerol, ethylene glycol, and sorbitol. The transparent membranes with good ionic conductivity properties were characterized by impedance and UV-vis spectroscopies, thermal analy…
ZnO nanocombs and nanorods with different morphologies have been successfully synthesized through a simple metal vapour deposition route at 600–750 °C using pure zinc powder or zinc and graphite powders as source materials. The structures and morphologies of the products were characterized in detail by using x-ray dif…
A new cationic polyfluorene derivative with 20 mol % 2,1,3-benzothiadiazole (BT) content was synthesized via Suzuki cross-coupling polymerization. The high charge density and cationic oligo(ethylene oxide) side chains endue the polymer with a good water solubility (∼12 mg/mL), leading to a low inherent BT emission bac…
We study the frictional drag in high mobility, strongly interacting GaAs bilayer hole systems in the vicinity of the filling factor $ν=1$ quantum Hall state (QHS), at the same fillings where the bilayer resistivity displays a reentrant insulating phase. Our measurements reveal a very large longitudinal drag resistivit…
We report on a study of Gilbert damping due to particle-hole pair excitations in conducting ferromagnets. We focus on a toy two-band model and on a four-band spherical model which provides an approximate description of ferromagnetic (Ga,Mn)As. These models are sufficiently simple that disorder-ladder-sum vertex correc…
A Pearson Effective Potential model for including quantization effects in the simulation of nanoscale nMOSFETs has been developed. This model, based on a realistic description of the function representing the non zero-size of the electron wave packet, has been used in a Monte-Carlo simulator for bulk, single gate SOI…