Materials Literature
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An improvement in the contrast ratio (CR) of transmittance characteristic of polymer dispersed liquid crystal (PDLC) was achieved by doping the polymer matrix with azo-dye and then orienting the dye molecules with the photo pumping technique. The contrast ratio was measured by the light scattering technique. We invest…
Calcium carbonate crystals were grown in a CaCl 2 –Na 2 CO 3 solution containing an amino acid. We have employed 12 different types of amino acids as additives. The concentrations of noncharged-polar amino acids and those of the acidic ones in CaCO 3 precipitates are one or two orders higher than those of all of the o…
The deactivation effects of the lowest excited states of Er3+ and Ho3+ introduced in Er-or Ho-LiYF4 (YLF) crystals, codoped with Nd ions, were observed by the activator’s fluorescence decays. In the case of Er:Nd:YLF, the I13/24→4I15/2 and I11/24→4I13/2 transitions at 1.5 and 2.7 μm, respectively, were analyzed. The I…
We investigated the control of water droplets on super-hydrophobic surfaces using a static electric field. The electric field required for droplet motion was decreased as the droplet size or the height from which the droplets were released increased. The Coulomb force of the electric charge provided to the water from…
A series of natural silica impactite samples from Chicxulub (Mexico) was investigated by Raman microprobe (RMP) analysis. The data yield evidence for high-pressure shock metamorphism in the rock. The impactite contains three polymorphs of silica: the original α -quartz, and two high-pressure varieties – coesite and di…
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…