Materials Literature
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Extended photonic crystal slabs with light-guiding defects have been created by a combination of laser interference lithography (LIL) and local focused ion beam (FIB) assisted deposition. Large area, highly uniform photonic crystal slabs for visible light are thus made possible. The Figure shows a freestanding Si3N4–a…
Polyetherimides are versatile melt-processable engineering resins. A series of fluoro-polyetherimides compositions based on diether-containing diamines were designed on paper and their dielectric constants (ϵ′) estimated before their synthesis. Experimentally determined ϵ′ values were compared with the estimated value…
To check if the adsorption/desorption of 2,6-dimethylpyridine (2,6-DMP) is a suitable probe for the surface acidity of oxides, and to assign a band of controversial interpretation often observed upon 2,6-DMP adsorption, the ambient temperature uptake of 2,6-DMP on several oxidic systems was carried out. SiO 2 was obse…
Abstract A 1‐D transient mathematical model was studied for a composite system consisting of a substrate (steel) and an intumescent coating exposed to radiative heating. By applying a simple heat conduction equation for the first material, a general model proposes the coating consisting of three components, which degr…
An approach for embedding high‐permittivity dielectric thin films into glass epoxy laminate packages has been developed. Lead lanthanum zirconate titanate (Pb 0.85 La 0.15 (Zr 0.52 Ti 0.48 ) 0.96 O 3 , PLZT) thin films were prepared using chemical solution deposition on nickel‐coated copper foils that were 50 μm thick…
This paper describes cDNAs of four small-size proteins that occur in the cocoon silk of Bombyxmori. Two of them (9.9 and 10.3 kDa), which have the N-terminal sequences and the spacing of a few amino acids at C-termini similar to the seroin of Galleria mellonella, are called seroin 1 and seroin 2. The corresponding gen…
Platinum and tin deposited on a calcined hydrotalcite constitute a new and highly efficient catalyst for the dehydrogenation of propane. The catalyst is superior to conventional alumina-supported systems in terms of lifetime stability, activity, and propene selectivity. The catalysts were characterized by BET, XRD, SE…
The interface between the surfaces of clay minerals and other materials (aqueous solution, organic moieties, biomolecules, etc. ) is of great importance to many geological, technological and biological processes. The examination of the structure and composition of mineral surfaces is advancing rapidly. However, the cr…
Monte Carlo methods were used to calculate heat capacities as functions of temperature for classical atomic clusters of aggregate sizes 25⩽N⩽60 that were bound by pairwise Lennard-Jones potentials. The parallel tempering method was used to overcome convergence difficulties due to quasiergodicity in the solid-liquid ph…
Carbon coatings are widely used to modify surfaces of materials and improve their tribological properties. In this work, carbon layers were formed on various types of sintered and CVD silicon carbide (SiC) using a novel technique involving a reaction with chlorine and chlorine-hydrogen gas mixtures at 1000 °C. Followi…
Ceramic foams in the system Si‐O‐C, possessing different bulk densities and morphologies, were obtained from preceramic polymers using two different direct foaming approaches. The electric properties of the foams were varied by adding suitable fillers to the precursor mixtures in amounts up to 80 wt%. The electrical c…
The structure and electronic transport properties of polymer‐derived pristine and boron‐doped silicon carbonitride ceramics have been studied, with particular emphasis on understanding the effect of annealing treatments. Structural analysis using the radial distribution function formalism showed that the local structu…
Alumina and titania supported tin dioxide catalysts presenting various Sn loadings were prepared by impregnation. The acidity and basicity of the samples were determined by adsorption of ammonia and sulfur dioxide, respectively, using adsorption microcalorimetry and X-ray photoelectron spectroscopy. The surface reacti…
A combination of the well-defined character of π-conjugated oligomers and the material properties of polymers is displayed by the supramolecular hydrogen-bonded π-conjugated architectures of the title compounds (see scheme). These compounds have been successfully used for the first time in electronic devices.
We have performed molecular dynamics simulations of amorphous Si 3 N 4 containing boron (Si‐B‐N). We have examined short‐range atomic arrangements and self‐diffusion constants of amorphous Si‐B‐N systems with various boron contents. Our simulations show that boron atoms are threefold coordinated by nitrogen atoms and…
A hydrophobic, CF3-functionalized silica aerogel has been applied to water-oil mixtures to determine oil absorbing capacity of the solid aerogel. Preliminary tests on Prudhoe Bay crude oil mixed with salt water, using the aerogel in powder form, show three regimes for absorbing based on oil to aerogel wt ratios (O/A):…
This paper demonstrates the viability of in-situ transmission electron microscopy for studying the deformation mechanisms of polymer nano-composites. In-situ straining studies are performed on carbon multiwalled nanotube (MWNT)-polystyrene composite films. The experiments show that load transfer across the nanotube-po…
The crystallographic and group theoretical analysis of the structural phase transitions in perovskite and perovskite-like crystals is reviewed. We include ABX3 perovskites and their relative crystals of ReO3 type (G0 = O1 h), elpasolites, cryolites and their relatives (G0 = O5 h), layered crystals of T1AlF4 series (G0…
The lattice thermal conductivity of a thermoelectric material can be significantly reduced at ordinary temperatures by boundary scattering but the beneficial effect on the figure of merit can sometimes be more than offset by boundary scattering of the charge carriers. Here we extend the previous theory to include both…
The oxidation behavior of three precursor‐derived ceramics—Si 4.46 BC 7.32 N 4.40 (AMF2p), Si 2.72 BC 4.51 N 2.69 (AMF3p), and Si 3.08 BC 4.39 N 2.28 (T2/1p)—was investigated at 1300° and 1500°C. Scale growth at 1500°C in air can be approximated by a parabolic rate law with rate constants of 0.0599 and 0.0593 μm 2 /h…