Materials Literature
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Abstract Transparent and homogeneous polymer hybrids were obtained from a series of random styrene/ N,N ‐dimethylacrylamide copolymers (PS n PA m ) and octa(3‐hydroxypropyldimethylsiloxy)octasilsesquioxane (Cube‐OH) by means of the sol–gel reaction of phenyltrimethoxysilane (PTMOS). The resulting ternary polymer hybri…
Structure, magnetism, and transport have been investigated for ${L}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{Co}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ $(L=\mathrm{La},$ Pr, Nd, Sm, and Eu, $x=0,$ 0.1, and 0.2), in which Ru is doped at the Co site in perovskites ${L}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{CoO}}_{3}.$…
The pressure dependences of the lattice parameters, electronic structure, and bonding properties of the layered ternary compound Ti 3 SiC 2 were investigated by performing ab initio plane-wave pseudopotential total energy calculations. The material exhibited elastic anisotropy. The lattice constants and axial ratio we…
Uniform thin films of gold nanoparticles have been fabricated on gold substrates using a layer‐by‐layer self‐assembly approach (see Figure). The optical properties of these nanoparticle films were characterized using variable‐angle spectroscopic ellipsometry, and the data modeled using a Lorentz oscillator dispersion…
Abstract The development of the poly(3‐hydroxybutyrate) (PHB) morphology in the presence of already existent poly(vinylidene fluoride) (PVDF) spherulites was studied by two‐stage solidification with two separate crystallization temperatures. PVDF formed irregular dendrites at lower temperatures and regular, banded sph…
With the use of ab initio based molecular dynamics simulations we study the structural, dynamical and electronic properties of glassy $g\ensuremath{-}{\mathrm{GeS}}_{2}$ at room temperature. From the radial distribution function we find nearest neighbor distances almost identical to the experimental values and the sta…
High energy x-ray diffraction measurements on $\mathrm{Pb}({\mathrm{Zn}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}$ (PZN) single crystals show that the system does not have a rhombohedral symmetry at room temperature as previously believed. The phase (X) in the bulk of the crystal gives Bragg peaks similar to that of…
Porous anodic alumina (PAA) films with ordered nanopore arrays have been prepared by electrochemically anodizing aluminium in oxalic acid solutions, and the role of the oxalic impurities in the optical properties of PAA films has been discussed. Photoluminescence (PL) measurements show that the PAA films obtained have…
A group of iron‐doped novel oxides of cerium, terbium, and praseodymium are reported to produce hydrogen at relatively low temperatures through a cycling two‐step reaction process without catalyst. Iron doping in the oxides not only stimulates surface activity, but also lowers the reduction temperature of water vapor…
Abstract A novel single‐source precursor, zinc bis( O ‐ethylxanthate), was employed for the CVD of ZnS‐based thin films. The coatings were deposited on SiO 2 and SiO 2 /Si(100) substrates in a N 2 atmosphere in a cold‐wall reactor in the temperature range 250–400 °C. The optical properties of the films were investigat…
Low‐pressure cold welding has been used to fabricate 200 μm diameter organic light‐emitting devices (OLEDs) (see Figure). The contacts are made by transferring a metal film from a patterned, soft elastomeric stamp onto unpatterned organic and metal layers on a substrate. The process does not adversely affect the OLED…
The Raman scattering by phonons and magnons was studied for the first time in the polycrystalline solid solutions Ni c Mg 1− c O. The experimental Raman spectrum for c = 0.9 is similar to that of NiO and consists of six well resolved bands, whose origins are the disorder-induced one-phonon scattering (bands at 400 and…
The local arrangement of atoms surrounding a substitutional ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Fe}}^{3+}$ ion in $\ensuremath{\alpha}$-${\mathrm{Al}}_{2}{\mathrm{O}}_{3}:$ ${\mathrm{Cr}}^{3+}$ (ruby) and in $\ensuremath{\alpha}$-${\mathrm{Al}}_{2}{\mathrm{O}}_{3}:(\mathrm{F}\mathrm{e}\ensuremath{-}\mathrm{T}\mathrm{i}…
Structural phase transitions in the Aurivillius phase ferroelectrics ${\mathrm{SrBi}}_{2}{\mathrm{Nb}}_{2}{\mathrm{O}}_{9}$ and ${\mathrm{Bi}}_{5}{\mathrm{Ti}}_{3}{\mathrm{FeO}}_{15},$ containing two and four perovskite layers, respectively, have been studied using powder neutron diffraction. At temperatures below the…
Three elastic phases of covalent networks, (I) floppy, (II) isostatically rigid, and (III) stressed-rigid, have now been identified in glasses at specific degrees of cross linking (or chemical composition) both in theory and experiments. Here we use size-increasing cluster combinatorics and constraint counting algorit…
The third‐order nonlinear optical property χ (3) I of a film of single‐walled carbon nanotubes was studied in the infrared region. The film combines a high χ (3) I (–0.85 × 10 –7 esu at resonant wavelength) with a rapid transmittance recovery (from differential transmission spectra, see Figure), making it suitable for…
For biomedical applications, zirconia‐toughened alumina ceramics (see Figure) would be very appropriate materials, provided that the zirconia content is kept below the percolation threshold (upper limit of 16 vol.‐% 3Y‐TZP inside an alumina matrix). That the concept of a percolation threshold is relevant when talking…
The formation of "zero" (exponentially small) resistance states (ESRS) in high mobility two-dimensional electron systems (2DES) in a static magnetic field B and subjected to strong microwave (MW) radiation has attracted great theoretical interest. These states appear to be associated with a new kind of energy gap $Δ$.…
We have studied the low-temperature behavior of the magnetization and the specific heat of the bilayered perovskite system $% La_{2-2x}Sr_{1+2x}Mn_{2}O_{7}$, for $0.30\leq x\leq 0.50$. Our analysis reveals that below 30 K the temperature dependence of the magnetization of the ferromagnetic samples, $x=0.30$, 0.32, and…
The recently reported Rutherford backscattering and particle-induced x-ray emission experiments have revealed that in low-temperature molecular beam epitaxy grown ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ a significant part of the incorporated Mn atoms occupies tetrahedral interstitial sites in th…