Materials Literature
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Short-range structural disorder of the high-$\ensuremath{\kappa}$ dielectric $\mathrm{Ba}\mathrm{Ta}{\mathrm{O}}_{2}\mathrm{N}$ is revealed by the analysis of the extended x-ray-absorption fine-structure (EXAFS) spectroscopy measured at the Ta ${L}_{\mathit{III}}$ edge. Although previous neutron, x-ray, and electron d…
Abstract— Liquid‐crystal lasers exhibit narrow linewidth, large coherence area, and low threshold laser emission. Moreover, the wavelength of the laser line can be readily tuned using a variety of different external stimuli, including electric fields. These combined features make them particularly attractive as compac…
We report the direct measurements on the bulk morphology of vertically aligned multiwalled carbon nanotube (CNT) arrays using small angle neutron scattering (SANS). SANS measurements at different heights of CNT arrays corresponding to different stages of the growth reveal increasing alignment order along the thickness…
In situ x-ray diffraction was performed while annealing thin film Au∕Cu binary diffusion couples to directly observe diffusion at elevated temperatures. The temperature dependence of the interdiffusion coefficient was determined from isothermal measurements at 700, 800, and 900°C, where Cu and Au form a disordered con…
An X-band microwave waveguide coupler partially filled with a left-handed material is realized and measured. The electromagnetic wave propagates in the primary branch of the coupler which is filled with the left-handed material and is backward edge coupled into the secondary waveguide, filled with a right-handed mater…
The use of real time spectroscopic ellipsometry to study silver nanoparticle formation in a polystyrene matrix by temperature induced reduction of silver hexafluoroacetylacetonate is reported. The optical properties of the composite are modeled using Mie theory with a modified electron relaxation frequency in silver t…
A new multiscale simulation approach is introduced that couples atomistic-scale simulations using molecular dynamics (MD) with continuum-scale simulations using the recently developed material point method (MPM). In MPM, material continuum is represented by a finite collection of material points carrying all relevant…
Thin films of delafossites of α-AgGaO2 were prepared on α-Al2O3 (0001) and on Si (100) single crystal substrates by pulsed laser deposition. The films have a band gap of 4.12eV and a transparency of more than 50% in the visible region. The electrical conductivity at 300K was 3.2×10−4Scm−1. The positive sign of Seebeck…
A ferromagnetic oxide ${\mathrm{Co}}_{0.05}(\mathrm{LiNb}{)}_{0.95}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ was prepared by Co ion implantation into (104) ${\mathrm{LiNbO}}_{3}$ wafers. Co is uniformly distributed to a depth of $\ensuremath{\sim}220\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ by implanting at thr…
Abstract Capillary flows inside microchannels with patterned‐surfaces are investigated theoretically and numerically. The surface energy method is used to derive an equivalent contact angle (ECA) model for small capillary number flows. The SIMPLE algorithm using a volume of fluid (VOF) method is adopted to investigate…
Entropy changes due to magnetostructrual phase transition in Gd5SixGe4−x intermetallics have been studied based on a systematic analysis of experiment data and mean-field theory calculations. It is found that the magnetic and lattice entropy changes have the same sign. Further analysis indicates that the main entropy…
Abstract— A non‐synthetic approach to modify liquid crystals (LCs) by dispersing low concentrations of ferroelectric nanoparticles is reported. These dilute colloids are stable and appear similar to a pure LC. However, by changing the concentration and the type of ferroelectric particles, the physical properties of th…
Diatoms have been classified historically as either centric or pennate based on a number of features, cell outline foremost among them. The consensus among nearly every estimate of the diatom phylogeny is that the traditional pennate diatoms (Pennales) constitute a well‐supported clade, whereas centric diatoms do not.…
The generation of microwave plasma in liquid with vapor bubbles has been achieved and will soon be applied to high-speed chemical vapor deposition. Vapor bubbles are induced from an electrode by heating. The deposition rate of diamondlike carbon films depends on the pressure and the power of the microwave supply. Poly…
We have produced metal wire grids with 33nm periodicity, using a thin film of a self-assembling diblock copolymer as a template. These grids, supported on fused quartz wafers, function as transmission polarizers for visible and near-ultraviolet lights. Their polarization efficiency is measured to be near 50% in the vi…
The average pressure inside a sonoluminescing bubble in sulfuric acid has been determined by two independent techniques: (1) plasma diagnostics applied to Ar atom emission lines, and (2) light scattering measurements of bubble radius vs time. For dimly luminescing bubbles, both methods yield intracavity pressures appr…
Transparent MgAl2O4 spinel nanoceramics have been sintered at relatively low-temperature (500–700°C) under high pressure (2–5GPa) using a hydrostatic press with high-temperature-calcined nanopowders. The morphology, nanostructure, optical property, and density of ceramics were analyzed by scanning electron microscopy,…
The electrical characteristics of ZnO thin-film transistors with high-k (Ba,Sr)TiO3 gate dielectrics are presented. The ZnO and (Ba,Sr)TiO3 thin films were deposited on Pt, exhibiting polycrystalline characteristics. The thin-film devices demonstrated transistor behavior over the range of 0–10V with a stable threshold…
Orientation-dependent cathodoluminescence has been found in crossed nanowire arrays (see figure). ZnS crossed nanowire arrays and aligned nanoribbons are grown on micrometer-wide single-crystal ZnS ribbon substrates, which leads to bandgap lasing emission in two specific directions. The reported results present a new…
The localized surface plasmon resonance (LSPR) is a collective oscillation of the nanoparticle conduction electrons. LSPR excitation in silver and gold nanoparticles produces strong extinction and scattering spectra that in recent years have been used for important sensing and spectroscopy applications. Tuning the opt…