Materials Literature
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The static electric dipole polarizabilities of Nb2–Nb27 have been measured via a molecular beam deflection method. The clusters display per-atom polarizabilities that vary between 5.4±0.3 Å3 per atom (Nb10) to 37.7±0.3 Å3 (Nb13). The factor of ∼7 variation observed in the per-atom polarizabilities is the largest obser…
An isolation technology for radio frequency (rf) applications based on unoxidized porous Si (PS) is demonstrated. This study examines all the important issues pertinent to incorporating PS with Si very-large-scale integration (VLSI) technology, where PS is used as a semi-insulating material. Specifically, the issues o…
The structure and properties of self-trapped excitons (STE), were investigated using density functional theory (DFT) and wave function-based [UHF, UMP2, CAS-SCF, and CCSD(T)] electronic structure methods. The DFT results were compared to those obtained using the different wave function-based electronic structure metho…
Multiwalled carbon nanotubes (CNT) were functionalized by oxidation with potassium permanganate using a phase transfer catalyst in mild conditions. SU-8 reacted with functional groups, such as –OH and –COOH, of the functionalized carbon nanotubes by opening epoxide groups with the help of surfactants. Ultrasonic irrad…
Optical properties of cobalt-doped zinc aluminosilicate transparent glass ceramics in the visible – near-infrared (IR) spectral range have been studied. It was shown that the absorption and luminescence properties of these glass ceramics are defined mainly by tetrahedrally coordinated Co2+ ions located in ZnAl2O4 gahn…
Effects of substrate temperature (Ts) on nanostructure and band structure of sputtered Co3O4 thin films were investigated. The lattice constant of Co3O4 sputtered at room temperature was longer than the reported bulk Co3O4 value. It decreased with increasing Ts and approached the reported value. Average grain size of…
We propose a method to determine the indium concentrations x and y in the InyAl1−yAs/InxGa1−xAs metamorphic structures. This approach is based on the combination of two experimental techniques: (i) reciprocal space mapping (RSM) to determine the average In composition in the InAlAs layers and (ii) transmission electro…
An artificial gene encoding the amino acid repeat sequence (AEAEAKAKAEAEAKAK) 9 was constructed and expressed in E. coli . affording a 17 236 Da His-tagged fusion protein, poly-EAK9. Circular dichroism and FTIR results suggest that poly-EAK9 adopts an extended β-strand conformation in an antiparallel β-sheet supramole…
Sol-gel derived polycrystalline La-doped PbTiO3 films are investigated by scanning force microscopy (SFM) in a piezoelectric contact mode. The SFM signal proportional to the effective piezoelectric coefficient, deff, is measured inside individual domains as a function of the mechanical force exerted by the SFM tip on…
Collective excitations have been observed in liquid aluminum oxide at high temperatures by combining a containerless sample environment with inelastic x-ray scattering. The excitation spectra show a well-defined triplet peak structure at lower wave vectors Q (1 to 6 nanometers-1) and a single quasi-elastic peak at hig…
In this article we report the thermodynamic investigations on the Ericsson cycle with application on RNi2 (R=Nd, Gd, Tb, Dy, Ho, and Er) series. Besides the Zeeman and exchange interactions, these compounds present an important contribution from crystalline electrical field interaction. The Ericsson coefficient of per…
Abstract Acrylic acid was grafted to ozone‐treated poly(3‐hydroxybutyric acid) (PHB) and poly(3‐hydroxybutyric acid‐ co ‐3‐hydroxyvaleric acid) (PHBV) membranes. The resulting membranes were further grafted with chitosan (CS) or chitooligosaccharide (COS) via esterification. These CS‐ or COS‐grafted membranes showed a…
We analyze the stability of particles at liquid–fluid interfaces as a function of their shape and orientation with respect to the interface plane. To do this we apply the generalized Young’s equation, including the line and surface tensions, to the specific shapes of prolate and oblate particles. We show that particle…
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.