Materials Literature
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This study describes an electrically tunable two-dimensional (2D) liquid crystal holographic polarization grating. It is a twisted nematic grating array, which is obtained by orthogonally overlaying two crossed one-dimensional (1D) polarization holograms. A 1D polarization hologram has a rotating linear polarization p…
The photodegradation behavior of three different transparent silicone elastomers, primarily used in space, was investigated experimentally. Samples were irradiated by an artificial ultraviolet (UV) light source, whose spectrum was split into five discrete wavelength bands in the range from 200 to 400 nm. The transmitt…
Periodic mesoporous organosilicates were synthesized under basic conditions using mixtures of phenyl and biphenyl silsesquioxane precursors in the presence of octadecyltrimethylammonium chloride as structure-directing agent. In addition to the hexagonally arranged mesopores, the materials derived from mixed precursors…
The electronic properties of single-wall AlGaN2 nanotubes were investigated using first-principles calculations and generalized gradient approximation. All AlGaN2 nanotubes considered are semiconductors, but their band structures depend on their chirality and size due to curvature effect and symmetry. The zigzag AlGaN…
The x-ray diffraction patterns, transmission electron microscopy images, and selected-area electron diffraction patterns for the ZnO∕Si heterostructures annealed at 900°C showed that orthorhombic ZnSiO3 nanoparticles were formed in the amorphous layer between the ZnO film and the Si substrate, resulting from the inter…
Heat treatment of wood fibers in a closed press for 4 and 8 minutes and pressed into fiberboards greatly reduces moisture regain and increases dimensional stability of the boards. Part of the hemicellulose sugars are lost during the steam treatment and furan intermediates were detected. Mannose, galactose, xylose, ara…
The potential of using nanometallic wires inside a matrix as new generation of thermal interface material led us to study the thermal diffusivity of nickel nanowires embedded inside porous alumina template. Thermal diffusivity measurements using a laser flash method showed size dependence for nickel nanowires inside n…
Variable angle spectroscopic ellipsometry (VASE) was employed to study the optical properties of As33S67−xSex (x=0, 17, 33.5, 50, and 67at.%) bulk glasses in the UV-vis-NIR (near infrared) spectral region for photon energies from 0.54to4.13eV (photon wavelengths from 2300to300nm). For data analysis, we employed Tauc–L…
Spectroscopic investigation of Er3+ doped Sc2O3 transparent ceramics was performed in order to assess its potential as a laser material for different emission wavelengths. The Judd–Ofelt intensity parameters for the f-f transitions of the C2-symmetry center of Er3+ in Sc2O3 transparent ceramics, inferred from the room…
We present density of states and electronic transport calculations of single vacancies in carbon nanotubes. We confirm that the defect reconstructs into a pentagon and a nonagon, following the removal of a single carbon atom. This leads to the formation of a dangling bond. Finally, we demonstrate that care must be tak…
The Sr-substituted Ba2NaNb5O15 (Ba2−xSrxNaNb5O15) thin films were prepared on the La0.05Sr0.95TiO3 substrates by pulsed laser deposition. When the substrate temperature was fixed at 700°C, the thin films exhibited highly c-axis orientation and smooth surface. The c-axis orientation and surface roughness do not depend…
Nanosized (Sr2FeMoO6)1−x∕(CeO2)x composites were prepared by Sr2FeMoO6 (SFMO) obtained by sol-gel and nanosized CeO2 powders. The magnetoresistance (MR) of composites is explored as a function of the molybdate/insulator composition and magnetic field. The enhancement of the low-field magnetoresistance is observed with…
Comparative studies of the microstructure, micro‐Raman spectroscopy, and dielectric properties of PbSc 0.50 Nb 0.25 Ta 0.25 O 3 (PSNT) thin films and nanoceramics were carried out over a wide range of temperature (100–520 K) and frequency (100 Hz to 1 MHz). The microstructure of PSNT films revealed an in‐plane compres…
Electromigration experiments using Cu∕low-k interconnect tree structures were carried out in order to study the effects of active atomic sinks and reservoirs on interconnect reliability. In all cases, failures occurred after a long period of void growth. Kinetic parameters were extracted from resistance versus time da…
Sandvik Sanicro 25 is an austenitic alloy with excellent high-temperature strength and corrosion resistance based on an economical composition.
The versatile preparation of the polyelectrolyte multilayered capsules functionalized with gold nanorods (AuNRs) is described. By seed-mediated growth of AuNR directly onto the capsules, stable complexation of the AuNRs onto the capsules can be achieved (see image). The resulting capsules show improved optical stabili…
The atomistic origin of the atomic vacancy or nanocavity induced hardening in hollow nanotubes and nanoporous structures has long been a puzzle. An analysis from the perspective of bond-order–length-strength correlation mechanism [C. Q. Sun, Prog. Solid State Chem. 35, 1 (2007)] has led to solutions that show that the…
UFG Cu was found to experience two stages of strain hardening processes under uniaxial tensile stress, which was similar to the Stage IV and V of CG Cu after large plastic deformation. The storage of dislocations in small grains and dynamic recovery caused by annihilation of dislocations and GB-mediated processes were…
An analytical model for size-dependent interface phonon transmission and thermal conductivity of nanolaminates is derived based on the improved acoustic mismatch theory and the Lindemann melting theory by considering the size effect of phonon velocity and the interface lattice mismatch effect. The model suggests that…
Abstract To study temperature‐induced changes in the specific enthalpy of materials, the differential scanning calorimetry technique (DSC) is a powerful experimental approach. It is well‐established in physical chemistry and materials science but less familiar in continuum mechanics. In this context, the balance equat…