Materials Literature
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The equilibrium thermal expansivity (β T ) and oxygen-vacancy chemical expansivity (β C ) of polycrystalline La 1 - x Sr x CoO 3 - δ (LSC; x = 0.2, 0.4, and 0.7) have been measured at 600 °C < T < 900 °C and 10 - 4 atm < P O 2 < 0.21 atm using controlled-atmosphere dilatometry. These measurements show only a moderate…
At the interface: The supramolecular organization of nanometer-scale objects is of great interest in the field of applied nanotechnology. Liquid–liquid interfaces can provide an alternative to current methods for the formation of highly ordered structures through the self-assembly of nanoparticles, nanocrystals, and e…
In a spin: The mixed-valent {MnIII20−xMnIIx} cage complexes (x=2–6) have structures corresponding to a fragment of a cubic close-packed lattice (see picture, Mn large sphere, O small sphere). Magnetic studies show for the cage with x=2 that the ground state has a spin (S) of 19±1 in low field, which increases to about…
In this paper we demonstrate that the sonication-driven exfoliation of aggregates and bundles of single-wall carbon nanotubes (SWNTs) in an aqueous surfactant solution can be easily monitored by UV-vis spectroscopy. The different stages of the exfoliation process were directly visualized by cryogenic temperature trans…
The encapsulation of enzymes and other proteins into inorganic host materials has attracted considerable attention over the past few years. This research has demonstrated that biomolecules immobilized in inorganic matrixes retain their functional characteristics to a large extent. These new materials are of interest f…
Controlled self-organization of nanoparticles can lead to new materials. The colloidal crystallization of non-spherical nanocrystals is a reaction channel in many crystallization reactions. With additives, self-organization can be stopped at an intermediary step-a mesocrystal-in which the primary units can still be id…
The incommensurate palmierite-like structure of beta-K5Yb(MoO4)4, potassium ytterbium tetramolydate, has been refined in the (3 + 1)-dimensional monoclinic superspace group X2/m(0rho0)00, with X = [0 0 0 0; (1/2) (1/2) 0 0; 0 0 (1/2) (1/2); (1/2) (1/2) (1/2) (1/2)] and the unit-cell parameters a = 10.4054 (16), b = 6.…
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…