Materials Literature
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Visible light emission from porous silicon can be stimulated by applying a positive bias to a formic acid/sodium formate liquid junction cell. The emission lasts for 45 min at +2.75 V applied potential (<5 mA/cm2, power conversion efficiency ≳10−2%) and is reliably generated from n- or p-type porous silicon. An…
The influence of size on the dielectric behaviour of ferroelectrics is discussed using phenomenological Landau theory. Three types of free-standing geometry are used in our calculations-film, cylinder and sphere. For films, there is a size-driven phase transition (i.e. a transition from a ferroelectric state to a para…
We find that the reduction of the switchable polarization in BaTiO3 crystals via repeated polarization reversals (fatigue) is accompanied by the trapping of electronic charge and atomic scale distortions in the perovskite oxygen octahedron. The distortions are proposed to involve oxygen vacancies.
The quantum Hall effect is investigated in the organic conductor (TMTSF${)}_{2}$P${\mathrm{F}}_{6}$ (TMTSF is tetramethyltetraselenafulvalene) under hydrostatic pressure. Under a pressure of $p\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}9$ kbar, the sequence of the quantum Hall numbers $L\phantom{\rule{0ex}{0ex…
The elastic shear modulus of monodisperse emulsions is shown to exhibit a universal dependence on droplet volume fraction $\ensuremath{\varphi}$ when scaled by the Laplace pressure of the droplets, increasing as $\ensuremath{\varphi}(\ensuremath{\varphi}\ensuremath{-}{\ensuremath{\varphi}}_{c})$, where ${\ensuremath{\…
Polymer blends were prepared based on three different types of LDPE (A.B.C) and polystyrene without or with compatibilizer (KRATON G-1652) and with the addition of a pigment Iriodin, for the improvement of the optical properties. The Brabender torque and the tensile properties of the polymer blends were determined, pa…
A polyfluorotriarylmethane polymer was prepared by the reaction of 3,5-diflurophenol (3,5-DFPh) with pentaflurobenzaldehyde (PFBA). The polymer obtained was characterized by NMR, FT-IR, UVVis, MS and Gel permeation Chromatography (GPC). It was found that phenolic ring in the polymer was connected at meta-position by m…
The initial structural analysis of the ternary complex of procarboxypeptidase A from hemihedrally twinned crystals diffracting up to 2.8 A is described. Detection of twinning by different techniques is presented, including biochemical and intensity statistics approaches. The structure was initially solved using Patter…
Two brominated flame-retardant additives, Great Lakes CD-75P (hexabro-mocyc lododecane) and Great Lakes PDBS (a polymer of dibromostyrene ), are introduced into acrylonitrile/vinyl acetate (AN/VA) fibers, and their effects on the fibers' thermal and mechanical properties, morphology, and flammability are investigated.…
Heavy charged particles travel in essentially straight lines in matter, while electrons travel in tortuous paths. Frequent multiple elastic Coulomb scattering by atomic nuclei is often cited as the reason for this electron behavior. Heavy charged particles also undergo multiple Coulomb scattering. However, because the…
Radioactive liquid waste from nuclear materials production processes wi11 be vitrified in the Defense Waste Process Facility (DWPF) melter. The melter borescope outer housing, fabricated from N06690, was severely degraded by the combined effects of corrosion and oxidation after only five months of non radioactive oper…
Abstract The phase behavior of ternary blends was analyzed on the basis of the lattice approach. Both compatibilization and incompatibilization effects are predicted to occur depending on the relative magnitudes and the sign of the interaction parameters of the binary subsystems. Thermodynamic, structural and kinetic…
The impact resistance of aluminum–aluminum joint bonded with FM-73 (American Cyanamid) structural adhesive was studied using laser-induced shock waves. The adhesive joint failed in a ductile mode, showing shock absorbtion ability through plastic deformation. All stages of the impact damage were identified from thresho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the Layered Intercalate TaS2{Co(Cp)2}0.25: A Powder X-ray, Neutron Diffraction, and Solid-State NMR StudyJ. S. O. Evans and D. O'HareCite this: Chem. Mater. 1995, 7, 9, 1668–1674Publication Date (Print):September 1, 1995Publication History Published online1 May…
Sodium thiophosphinyl cyanamide Na[Ph2P(S)NCN] reacts with aryl-and alkylammonium chlorides [RNH3]Cl under mild conditions to the corresponding aryl- or alkylammonium thiophosphinyl cyanamides, which rearrange to N-aryl(alkyl)-N′-thiophosphinyl guanidines in a Wöhler's type reaction.
The first examples of PEG linkers containing the highly fluorescent dansyl group have been synthesized. Quantum yields of these PEG fluorescent linkers (PFL) were determined and utilized in calculating the PEG number of various protein conjugates. The method was also shown to be applicable to lower molecular weight dr…
Ductile irons containing additions of up to 0·44% Vand 0·48%Co have been prepared and tested in the as cast state and after aferritising heat treatment. In the heat treated condition the microstructure of the alloyed irons consists of graphite nodules in aferrite matrix that contains afine dispersion (20–80 nm in dia.…
Farmers and scientists joined forces in the late 1980s to develop milkweed as an alternative crop and source offiber. Efforts continue to develop milkweed floss fiber as an insulative fill material. A major barrier to increased utilization is its tendency to form mats during laundering or drycleaning. This research so…
Abstract The path length distribution function (PLDF) for backscattered electrons was calculated within the four‐flow approximation. The problem was solved by using the invariant‐embedding approach. It was shown that the PLDF is very sensitive to the variation of the parameter describing the elastic scattering cross‐s…
Abstract Mn x Zn (1− x ) CO 3 solid-solutions were prepared at 5°C by precipitation from metal-bearing bicarbonate solutions. The solids were identified by X-ray powder diffraction and infrared spectroscopy. Zn 2+ ions substitute extensively for Mn 2+ ions in the crystal lattice of anhydrous rhombohedral carbonates. T…