Materials Literature
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Zn 0.3 Al 0.25 Pb 0.3 Li 0.098 Yb 0.1 Tm 0.002 F 2.354 amorphous fluoride film was prepared by pulsed laser deposition. Ultraviolet and blue up-conversion emissions were observed under infrared excitation at 978 nm. In comparison with the upconversion of the target, the ultraviolet emissions are enhanced greatly. The…
Abstract The crystal structure of poly(ω‐pentadecalactone) (PPDL) synthesized by enzyme‐catalyzed polymerization was determined by full‐profile refinement. A pseudo‐orthorombic monoclinic unit cell with dimensions a = 7.49(1), b = 5.034(9), and c = 20.00(4)Å (fiber axis), and α = 90.06(4)° hosts two monomeric units be…
The catalytic particle size dependence of chemical vapor deposition growth of multiwall carbon nanotubes was systematically investigated using two different molecules, C2H2 and C60, as carbon feedstock gases. In the particle size range between 25 and 500 nm, the use of C2H2 leads exclusively to growth of carbon nanotu…
Crystallographic structure of as-grown epitaxial Pb(Zr,Ti)O3 (PZT) films was investigated with regard to the Zr/Ti ratio and crystalline orientation. PZT films with (001) and (111) orientation were epitaxially grown on (100) and (111)SrTiO3 substrates respectively using radio-frequency (rf) sputtering. Four circle x-r…
Samples of silicon nanocrystals on various substrates were prepared by cluster beam deposition of silicon nanoparticles, obtained by laser-induced pyrolysis of silane in a flow reactor. Using optical ellipsometry, the optical properties (refractive index and extinction coefficient) of the as-prepared silicon nanocryst…
Thin films of 5% Co doped Cu2O were grown on single-crystal (001) MgO substrates by pulsed-laser deposition, without and with 0.5% codoping with Al, V, or Zn. Structural, electrical, and magnetic properties were studied. The films showed phase-pure character under the chosen optimum growth conditions. Spin-glass-like…
[reaction: see text] Phosphine-palladium complexes, immobilized on polystyrene, demonstrated a remarkable increase in catalytic activity and selectivity in the Heck reaction upon the introduction of a dendritic spacer between the support and phosphine. For some reactions an up to 5-fold increase in yield is observed.
Thermal stress characteristics of single damascene Cu lines passivated with tetraethyl orthosilicate oxide and methyl silsesquioxane low-k dielectrics were investigated by x-ray diffraction method and finite element analysis. Lines with different aspect ratios were studied, and the effect of line geometry was evaluate…
Enhancement of dielectric properties has been demonstrated in BaTiO3 (BTO)/SrTiO3 (STO) strained artificial lattice. Large variation of lattice distortion in the consisting BTO and STO layers was achieved by varying a stacking sequence of BTO and STO layers. From this strain manipulation, it is found that BTO and STO…
Abstract Sol‐gel surface deposition of a hydrophobic polysiloxane coating on wood was accomplished by using a mixture of a low molecular weight multifunctional alkoxysilane, methyltrimethoxysilane (MTMOS), and a high molecular weight multifunctional alkoxysilane, hexadecyltrimethoxysilane (HDTMOS). Investigation of th…
The effect of Mn substitution on ferroelectric and antiferromagnetic properties of the Bi0.9La0.1Fe1−xMnxO3 system has been studied. It is seen that, with the increase in Mn content, there is a contraction in unit cell volume. Since the cell volume contraction is isotropic, lattice distortion (c/a) remains the same an…
New biodegradable amphiphilic ABA triblock copolymers consisting of poly(ethylene oxide) (PEO) as the hydrophilic block and poly[( R )-3-hydroxy butyrate] (PHB) as the hydrophobic block were synthesized by coupling two chains of methoxy-PEO-monocarboxylic acid with a low molecular weight telechelic hydroxylated PHB (P…
Synthesis of nano- and microcrystalline sp3-bonded carbon (diamond) with cubic and hexagonal structure by extraction of silicon from silicon carbide in chlorine-containing gases has been reported recently. This process is attractive because it can produce diamond at ambient pressure and temperatures below 1000 °C. No…
The 0.675Pb(Mg1/3Nb2/3)O3–0.325PbTiO3 (PMN–32.5PT) ceramic composition (with 1 wt. % excess PbO) was fiber textured in the 〈001〉 direction by the templated grain growth process using 5 vol % oriented {001}-BaTiO3 platelet crystals as the templates. The templated ceramics annealed at 1150 °C for 5 h attained texture fr…
The color of the emission of zinc gallate (ZnGa2O4) oscillates between ultraviolet and blue by hydrogen ambient reduction and air ambient oxidation heat treatments. The photoluminescence spectra and electron paramagnetic resonance signals show that ultraviolet emission of reduced ZnGa2O4 always accompanies 680 nm emis…
Through introducing the iPP fibers into their supercooled homogeneity matrices, the homogeneity fiber/matrix composites of iPP have been prepared, and the resulting supermolecular structures of iPP matrices induced by their homogeneity fibers as a function of introduction temperature were studied by means of optical m…
Abstract In this study, the effects of batch processing conditions (foaming time and temperature) and blend composition as well as the effect of incorporating wood fiber into the blends on the crystallinity, sorption behavior of CO 2 , void fraction, and cellular morphology of microcellular foamed high‐density polyeth…
Electroplated Cu films with different plating conditions and thicknesses are characterized to study the stress and texture evolution involved in the transition of the microstructure during self-annealing. Grain growth during the process induces stress in the film in the tensile direction. Degradation of the (111) text…
Molybdenum trioxide (MoO 3 ) thin films prepared by cathodic electrodeposition on indium−tin-oxide coated glass substrates from aqueous peroxo-polymolybdate solutions have been studied as a function of sintering temperature (25−450 °C). Cyclic voltammetry, chronopotentiometry, chronoamperometry, and spectroelectrochem…
This paper presents a new approach to controlling shape memory alloy (SMA) actuators with hysteresis compensation by using a neural network feedforward controller and a sliding-mode based robust feedback controller. SMA actuators exhibit severe hysteresis, which is often responsible for position inaccuracy in a regula…