Materials Literature
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Techniques have been developed to produce ohmic contacts to naturally occurring boron doped semiconducting diamond. Thin films of Mo, Mo/Au, and Mo/Ni/Au deposited on diamond produced adherent ohmic contacts after annealing at 950 °C. A thermally activated solid state reaction which produces a refractory carbide preci…
Starburst dendrimers, spherical polymers constructed from methyl acrylate and ethylenediamine, were successfully used to covalently couple synthetic porphyrins to antibody molecules. The dendrimers, as linker molecules, have great potential for increasing the specific activity of radiolabeled antibodies for tumor ther…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical characteristics of poly(3-hydroxyalkanoates) and poly(3-hydroxyalkenoates) produced by Pseudomonas oleovorans grown on aliphatic hydrocarbonsHans Preusting, Atze Nijenhuis, and Bernard WitholtCite this: Macromolecules 1990, 23, 19, 4220–4224Publication Date (Print):…
The size and surface effects on the nematic-isotropic phase transition of a liquid crystal are analyzed using a functional form of the surface energy proportional to the square of the scalar order parameter. The evaluated temperature shift agrees with the published experimental observations. This form seems confirmed…
A phenomenological theory of polar structures in chiral biaxial liquid crystals is constructed exploiting the properties of a symmetric and traceless tensor order parameter field ${\mathit{Q}}_{\mathrm{\ensuremath{\alpha}}\mathrm{\ensuremath{\beta}}}$(r) and of a polar field ${\mathit{P}}_{\mathrm{\ensuremath{\alpha}}…
Abstract Calcareous sodic soils having high sodicity and high pH often maintain high solution P concentration. The effect of high exchangeable Na, high pH, and alkali anions and carbonates on the release of inorganic P was investigated in soils representing the three major benchmark sodic soil series found in the Indo…
Electric fields can cause structural changes of the blue phases (BP) that appears in chiral liquid crystals. In BP I and BP II, electrostrictive effects cause a shift of the Bragg reflection wavelengths with little intensity change. In BP III, for systems with negative dielectric anisotropy, there is a strong increase…
Many strains of the genus Ustilago were found to be good producers of organic acids, that is, itaconic, l-itatartaric, l-2-hydroxyparaconic, and l-malic acids. Itatartaric and 2-hydroxyparaconic acids were invariably produced together with itaconic acid. From these findings and the results of the experiments with perm…
Abstract The interaction between in situ evaporated aluminum and plyvinyl alcohol (PVA) polymer at 300 K was studied by XPS. The aluminum condenses on the PVA surface by a Volmer–Weber (clustering) mechanism; it takes about a 3.7 monolayer deposition to nucleate clusters sufficiently large to exhibit core binding ener…
The existence of polar regions in Na0.5Bi0.5Tio3 and pyroelectric measurements. Both dynamics and sizes of these regions depend on temperature and time.
A systematic study of the photoluminescence (PL) of Se-doped n-type GaAs grown by metalorganic chemical vapor deposition is reported. A new method is presented to determine the electron effective mass of n+-direct-gap semiconductors from the PL spectrum. GaAs samples with electron densities from 1015 to 8×1018 cm−3 we…
Carbon disulfide has long been recognized as a potent inhibitor of nitrification, and it is the likely active component in several nitrification inhibitors suitable for field use. The effects of this compound on Nitrosomonas europaea have been investigated, and the site of action has been determined. Low concentration…
The mechanical properties of as well as microstructural changes in rapidly solidified ternary Cu–Cr based alloys were studied for various ternary additions. The flow stresses of the binary and various ternary alloys are explained in terms of Orowan strengthening mechanisms. Zirconium, magnesium, and, to a lesser exten…
Abstract We present a planar cell design for Solid Oxide Fuel Cells (SOFC) which combines the ceramic materials of a solid electrolyte (Y‐stabilized ZrO 2 ), cathode (LaSrMeO 3 with Me : Mn, Co and Cr), and anode (Ni‐Cermet) with a metallic interconnection material, the so‐called metallic bipolar plate. This metallic…
The transmittance T and reflectance R of s- and p-polarized light, incident at various angles onto thin films which contain metal and voids in an oblique columnar structure, are analyzed using suitably modified thin film equations. Columnar aluminum is treated for various column angles in uniaxial and biaxial models t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole injection and etching studies of gallium arsenide using the scanning electrochemical microscopeDaniel Mandler and Allen J. BardCite this: Langmuir 1990, 6, 9, 1489–1494Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inis…
Abstract The tensile properties of 16 blends prepared from 12 different polymers were investigated in the whole composition range. The composition dependence of Young's modulus has shown less, while that of the yield and ultimate properties exhibited more significant variations with miscibility. The quantitative evalu…
The band structures of the ferromagnetic compounds FeB, ${\mathrm{Fe}}_{2}$B, and ${\mathrm{Fe}}_{3}$B were calculated using a spin-polarized version of the first-principles self-consistent orthogonalized linear-combination-of-atomic-orbitals method. Results on the band structure, density of states (DOS), and site-, o…
We propose a theoretical interpretation of observed anomalous rheological behavior of diblock copolymers quenched into microphase-separated states having locally lamellar morphology with disorder. The proposed mechanism of the anomaly is associated with the second-sound modes occurring in a locally lamellar structure…
Abstract In many tropical soil systems, secondary minerals are coated with sesquioxides, resulting in inherently low P availability to plants due to P‐fixation mechanisms. Research was conducted to determine the influence of hydroponically grown clover ( Trifolium repens L.) residue pretreatment in reducing orthophosp…