Materials Literature
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Abstract (NiMgAl)O x materials prepared from layered double hydroxide (LDH) precursors show a typical mesoporous structure with an average pore size of about 6 nm, excellent activity for the methane steam reforming (MSR) reaction at 650 °C, and a strong resistance against Li poisoning, suggesting the possibility for f…
Abstract Glow discharge AApp and HApp were prepared on silicon wafers and analyzed by XPS, AFM, Δ V ( ζ ‐measurements), XRR and NR. XRR and AFM measurements revealed smooth films of ≈30 nm thickness. XPS measurements in combination with XRR and NR allowed the film composition and mass densities (1.46 and 1.05 g · cm −…
Abstract We have developed a simple and efficient method for the synthesis of rigidized mono‐ and bis‐heptamethine merocyanines that contain one methine unit incorporated into a cyclopentene framework. The synthetic approach is based on C1/C5 regioselective nucleophilic addition of mono‐ and diketone lithium enolates…
Abstract Orientation correlations induced by shear flow and their relaxation were investigated using in situ small‐angle light scattering (SALS) in the thermotropic random copolyester of 60 mol% hydroxybenzoic acid (B) and 40 mol% ethylene terephthalate (ET). B‐ET displays a nematic polydomain texture, the SALS and wi…
Abstract Four poly(butylene adipate) (PBA) polyesters, the structure ranging from linear to highly branched, were synthesized and solution casted with poly(vinyl chloride) (PVC) in 20 or 40 wt % concentrations to evaluate the influence of polyester chain architecture on miscibility, surface segregation, and mechanical…
A number of recent experiments suggest that, at a given wetting speed, the dynamic contact angle formed by an advancing liquid-gas interface with a solid substrate depends on the flow field and geometry near the moving contact line. In the present work, this effect is investigated in the framework of an earlier develo…
Abstract Poly(butylene naphthalate) (PBN), poly(diethylene naphthalate) (PDEN), and poly(thiodiethylene naphthalate) (PTDEN) were synthesized and characterized in terms of chemical structure and molecular weight. The polyesters were examined by TGA, DSC, and DMTA. All the polymers showed a good thermal stability, even…
X-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) measurements have demonstrated the modification of the magnetic moment of Co in ${\mathrm{ErCo}}_{2}$ induced by applying pressure. Co $K$-edge and Er ${L}_{2}$-edge XAS and XMCD spectra recorded under applied hydrostatic pressures up to…
Using density functional theory we show that a recently synthesized silsesquioxanes (SQ) nano complex [RSiO 3/2 ] n with R = −C 5 H 5 provides a novel material for hydrogen storage. Grafting cyclopentadienyl on SQ totally changes its electronic structure and chemistry: cyclopentadienyl becomes a reactive site where a…
Abstract Thin films with a dielectric constant in the range of 1.9–4.5 have been deposited under different experimental conditions from allyltrimethylsilane (ATMS) and oxygen fed glow discharges. The thermal stability of the coatings is evaluated from thickness loss during the annealing process at 400 and 450 °C. Extr…
Changes in the Raman spectra of individual metallic single-walled carbon nantoubes (SWNTs) upon sidewall covalent bond formation have been studied. In light of the Fermi level shift dependent G-band line shape and D-band intensity in metallic tubes, the validity of commonly used D to G intensity ratio as an assessment…
The structural stability of $\mathrm{Na}\mathrm{Al}{\mathrm{H}}_{4}$, a promising hydrogen storage metal hydride system, has been investigated up to $27\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ using in situ synchrotron x-ray diffraction and Raman experiments with a diamond anvil cell. Analysis of both diffraction and…
We report the synthesis of two poly(phenylene ethynylene)s (PPEs) with alternating dialkylbenzene−perfluorobenzene repeating units. The combination of low volume fraction of solubilizing side chains and enhanced intermolecular π−π stacking renders these materials insoluble. A soluble polymer analogue was realized by u…
Purpose This paper seeks to examine the practical construction of a patented intelligent article of clothing with active thermal protection, outer shell with a variable thickness, system of thermoinsulating chambers, sensors and measuring systems, microcontroller and control system, actuator system and power supply sy…
Abstract Polystyrene samples were exposed to a nitrogen plasma for 30 s, 1, 2, and 4 min, and analyzed by angle‐resolved photoelectron spectroscopy. Oxygen and nitrogen adatom depth profiles were extracted from the elemental peak intensities using a maximum entropy method. The same method was used to extract chemicall…
Polyelectrolyte capsules were fabricated by layer-by-layer deposition of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) on glutardialdehyde fixed human erythrocytes and subsequent core dissolution using NaOCl as an oxidizing agent. SANS together with confocal laser scanning microscopy (CLSM) we…
Curing characteristics, fatigue, and hysteresis behaviour of feldspar filled SMR L vulcanizates and feldspar filled ENR 50 vulcanizates were studied. Two different types of natural rubber, SMR L and ENR 50 having 0 and 50 mol% of epoxide groups were used. The feldspar filled natural rubber vulcanizates were compared a…
We report on measurements of current-resistance effects in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ ultrathin films deposited by molecular beam epitaxy. dc transport and voltage noise spectral density analyses have been performed in the temperature range of $10--300\phantom{\rule{…
The structure of $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Zr}{\mathrm{W}}_{2}{\mathrm{O}}_{8}$ was optimized at different pressures and its elastic constants were calculated at the B3LYP density functional level of theory. Overall, the relative stiffnesses of the atomic bonds (and linkages), ranked in terms of…
A high quality Mg x Zn 1− x O thin film with up to ∼40 at% Mg incorporation was grown on a quartz substrate by the rf magnetron sputtering technique. The photoconductive type of Mg 0.4 Zn 0.6 O metal–semiconductor–metal ultraviolet detector was prepared. The ratio of the ultraviolet to visible was more than four order…