Materials Literature
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The electrical resistivity, thermopower, and thermal conductivity have been measured for the lanthanum sesquisulfide (La2S3) of which the crystal phase is controlled by the Ti additive. In all the samples, the thermopower is negative between 300 and 1000 K. The sample with 8 wt % Ti, which consists almost of the cubic…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract For Abstract see ChemInform Abstract in Full Text.
Photoluminescence from long afterglow phosphorescent SrAl12O19:Eu2+,Dy3+ phosphor crystals have been studied for a fluorescence thermometer at a temperature lower than 200K. Broadband emissions peaking at λ=404 and 519nm are observed from the crystals at room temperature. The λ=519nm emission is strongly coupled with…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract The dehydrochlorination and the thermal decomposition of five PVC materials was studied using two techniques: a batch analytical method, combining ion chromatography and atomic absorption and continuous thermogravimetry. The temperatures studied ranged from 60°C to 120°C, over a period of almost one year (50…
The crystal structure of Sr(OH)2*8H2O has been determined at 20, 100 and 200 K from neutron diffraction data. The structure consists of double layers of H2O and OH- ions separated by Sr2+ along the c axis. The Sr2+ ions are eight-coordinated by water O atoms in a square antiprism configuration. Each H2O molecule is en…
The cruel reality of today's world forces mankind to be alert and prepared for all kinds of terrorist threats, including exposure to radiation. There is a need for cost-effective alternatives to existing commercially available real-time gamma radiation dosimeters. In this paper, numerous oxides such as NiO, CeO/sub 2/…
Abstract Conductive carbon nanowires were made on the polished surface of a single crystal CVD diamond by 30 keV Ga + ion beam focused to 20 nm. Measurements of conductance of the as‐irradiated nanowires and those annealed at temperature 1400 °C revealed the onset of the ion‐induced conductance to be of 2 × 10 15 cm –…
The photoinduced reorientation behavior of dye-doped nematic liquid crystals (LCs) was investigated. Thiophene derivatives with ester moieties were newly synthesized as the guest dye molecule. The liquid-crystalline behavior and optical properties of these compounds were evaluated, and the effect of the dye structure…
Photoluminescence (PL) and lifetimes of colloidal CdS∕CdSe∕CdS (core∕well∕shell) quantum-well (QW) nanostructures are investigated for different well thicknesses in the temperature range of 77–300K. When the temperature increases, the PL intensity decreases continuously and PL peak shifts to lower energy side. The PL…
A capillary electrophoresis (CE) method was developed for the simultaneous analysis of small chitin and chitosan oligosaccharides. For detection purposes, the oligomers were derivatized with 8-aminopyrene-1,3,6-trisulfonic acid (APTS), a well known fluorophore for oligosaccharides analysis. The detection was performed…
Selenium is a trace element found in freshwater and the marine environment. We show that it plays a major role in spicule formation in the demosponge Suberites domuncula. If added to primmorphs, an in vitro sponge cell culture system, it stimulates the formation of siliceous spicules. Using differential display of tra…
We report measurements of x-ray absorption spectra and x-ray magnetic circular dichroism (XMCD) on thin films of the ferromagnetic Heusler compound ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ge}$ at the ${L}_{2,3}$ edges of Mn and Co. While the Co spectra are similar to those of metallic Co, the Mn spectra indicate partly l…
Mono- or bi-layer metallic single-wall carbon nanotube interconnects have lateral capacitances more than four times smaller than those of copper interconnects. The resistance and time-of-flight of these monolayer nanotubes would be larger than that of copper interconnects. For short lengths, however, driver resistance…
We show that the pitfalls encountered in earlier calculations of the RKKY range function for a noninteracting one-dimensional electron gas at zero temperature can be unraveled and successfully dealt with through a proper handling of the impurity potential.
In this paper, transparent flexible substrates based on polyimides (PIs) with aluminum doped zinc oxide (AZO) thin films for organic electroluminescent devices have been prepared. PI film based on 2,2'-bis-(3,4-dicarboxyphenyl) hexafluoropropanedianhydride (6FDA) and 2,2'-bis-(trifluoromethyl)-4,4'-diaminobiphenyl (TF…
We perform molecular dynamics (MD) simulations using the extended simple-point-charge (SPC/E) model for water to study the structural relaxation through the glass transition region. We follow the same standard protocol used in differential scanning calorimetry experiments. Specifically, we cool liquid configurations a…
The mixed form of alpha/beta lactose was obtained by heating amorphous alpha-lactose at 443 K. NMR spectroscopy determined the stoichiometry of this mixed compound to be 1/1. The X-ray powder diffraction pattern was recorded at room temperature with a sensitive curved detector (CPS 120). The structure was solved by re…
A blend of poly(epsilon-caprolactone) (PCL) and poly(vinyl chloride) (PVC) with 90 wt % PCL was prepared. Two films of this blend, which were grown at 35 and 45 degrees C, showed the absence and presence of banded spherulites, respectively. A detailed examination conducted with time-of-flight secondary ion mass spectr…