Materials Literature
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A thin film of tin oxide (SnO 2 ) was prepared on a plastic substrate by DC magnetron roll sputtering. The deposition thickness of SnO 2 rapidly decreased with the increase of O 2 gas flow rate, even though the refractive index remained almost constant at the level of 2.0 after the flow rate exceeded 40 sccm. The SnO…
A thin film of Sn-doped and GeTe-rich GeTe-Sb<SUB>2</SUB>Te<SUB>3</SUB> shows characteristics that make it suitable for use in rewritable dual-layer optical disks employing a violet laser. By increasing the GeTe component form Ge<SUB>2</SUB>Sb<SUB>2</SUB>Te<SUB>5</SUB> to Ge<SUB>4</SUB>Sb<SUB>2</SUB>Te<SUB>7</SUB>, an…
Resonant two-photon ionization spectroscopy has been used to study the diatomic transition-metal carbide, WC. A low-resolution scan revealed a five-member vibrational progression beginning with the 0-0 band at 17 585 cm−1. Analysis of this progression yielded a vibrational frequency of ωe′(184W12C)=752.6(4.9) cm−1 and…
The kinetics of molecular nitrogen desorption from Rh(111) single-crystal surfaces covered with atomic nitrogen were characterized by both isothermal and temperature-programmed experiments. A complex kinetic behavior was observed for this system not describable by typical Arrhenius expressions even if coverage-depende…
Amorphous Ge2Sb2Te5 films were prepared by rf sputtering from the bulk alloy. Their electrical and optical properties were analyzed using impedance and optical transmission measurements as a function of temperature. From this analysis, it is found that the glass transition temperature of the as-prepared amorphous film…
PapD is a periplasmic chaperone essential for P pilus formation in pyelonephritic strains of E. coli. It is composed of two domains, each of which contains a tryptophan residue (Trp-36 and Trp-128, in the N- and C-terminal domains, respectively). To explore the role of domain-domain interactions during folding, the pr…
We have used a nonionic inverse micelle synthesis technique to form nanoclusters of platinum and palladium. These nanoclusters can be rendered hydrophobic or hydrophilic by the appropriate choice of capping ligand. Unlike Au nanoclusters, Pt nanoclusters show great stability with thiol ligands in aqueous media. Alkane…
We describe a detailed study of the conformational properties of a very long polymer chain in the presence of small colloidal particles. The polymer chain is modeled by a random self-avoiding walk (SAW) on the cubic lattice. The properties of interest include the conformational entropy, segment distributions in the co…
A promising approach to obtain epitaxial films of oxide semiconductors was demonstrated, namely helicon-wave-excited-plasma sputtering epitaxy. Due to the surface-damage-free nature, completely a-axis-locked c(0001)-orientation ZnO epilayers were successfully grown on sapphire (0001) substrates having ultrasmooth surf…
The as-prepared and purified multiwalled carbon nanotubes (MWNTs) with a mean outer diameter of 5.1 nm were employed for hydrogen storage measurements. Compared with the as-prepared sample, the purified one has a much higher gravimetric hydrogen storage capacity. Then the purified MWNTs were cold-compacted into a cyli…
We carry out extensive molecular dynamics (MD) simulations of translation and rotation of spheroids in the suspension of spheres, for a wide range of values of the aspect ratio, κ ranging from the extreme limits of long rodlike molecules to the disc-shaped ones. While diffusion is anisotropic in short times (compared…
We have performed magnetic and transport measurements on a series of Nd0.67Sr0.33Mn1−xFexO3 polycrystalline compounds with x=0.0, 0.05, 0.10, and 0.15. For the Fe-undoped Nd0.67Sr0.33MnO3 (NSMO) materials, a magnetoresistance (MR) as high as ∼33% was observed at the metal–insulator transition temperature, Tp=273 K, in…
The reactivities of surface oxygen phases on Pd(100) toward reduction by CO were characterized using temperature-programmed desorption and reaction (TPD, TPR), isothermal kinetic measurements, low energy electron diffraction (LEED), and scanning tunneling microscopy (STM). When CO was exposed to high oxygen coverages…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLamellar Alignment of Diblock Copolymers in an Electric FieldA. V. Kyrylyuk, A. V. Zvelindovsky, G. J. A. Sevink, and J. G. E. M. FraaijeView Author Information Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands Cite this: Macromole…
We measured high spatial/depth resolution 300 K thermal conductivity κ of the Zn and O surfaces of two bulk n-type ZnO (0001) samples, grown by a vapor-phase transport method, using scanning thermal microscopy (SThM). The thermal investigation was performed in both point-by-point (∼2 μm resolution) and area-scan modes…
The crystalline orbitals of seven oxygen containing compounds with increasing degree of covalent character (MgO, MnO, ZnO, Al2O3, SiO2, AlPO4, and CaSO4) are localized according to a Wannier–Boys mixed scheme recently implemented. The resulting Wannier functions are analyzed in terms of various indices (centroids posi…
We have studied the structural and transport properties of Sb2Te3 thin films prepared by molecular beam epitaxy as a function of the Te/Sb flux ratio during deposition. Both the crystallinity and the transport properties are found to be strongly affected by nonstoichiometry. The most stoichiometric sample (prepared wi…
A methodology for the theoretical evaluation of Raman intensities for a molecule adsorbed on a metal particle aggregate, possibly in the presence of a solvent, is presented. The molecule is treated at the ab initio level, both in the evaluation of ground state electronic density and nuclear geometry, and in the evalua…
We have studied the structural properties of ZnO thin films grown on Al2O3 (00.1) single-crystal substrates by pulsed-laser deposition using either a femtosecond or a nanosecond laser. Although hexagonal ZnO films deposited on sapphire substrate were epitaxially grown in both cases, the crystalline quality was found t…
Using molecular simulations and free energy calculations based on Landau theory, we show that freezing/melting behavior of fluids of small molecules in pores of simple geometry can be understood in terms of two main parameters: the pore width H* (expressed as a multiple of the diameter of the fluid molecule) and a par…