Materials Literature
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We present a neutron scattering study over a wide range of wave vectors of the structure of the fragile glass former triphenylphosphite, with an emphasis on the recently discovered, apparently amorphous, glacial phase. Direct evidence is given by small-angle scattering data that the glacial phase has a structural orga…
Experiments and thermodynamic calculations were performed to gain a better understanding of the CVD of Ti3SiC2. The computer program SOLGASMIX-PV was used to calculate deposition diagrams for the TiCl4–SiCl4–CCl4–H2 reagent system. The effects of hydrogen to reagent concentration ratio, temperature, and pressure were…
Resistance–temperature ( R – T ) characteristics were measured directly at single‐grain boundaries in 0.1‐mol%‐niobium‐doped barium titanate bicrystals that had been fabricated from polycrystalline sinters, to determine a geometrical grain‐boundary character dependence of the positive temperature coefficient of resist…
In this study, cotton fabrics are treated at different curing temperatures with different concentrations of 1,2,3,4-butanetetracarboxylic acid (BTCA) catalyzed with sodium hy pophosphite (SHP). Strength retention and wrinkle recovery angle (WRA) are tested, and the results show that high curing temperature and high BT…
CDP-2,3-di-O-geranylgeranyl-sn-glycerol synthase (CDP-archaeol synthase) activity was discovered in the membrane fraction of the methanoarchaeon Methanothermobacter thermoautotrophicus cells. It catalyzed the formation of CDP-2,3-di-O-geranylgeranyl-sn-glycerol from CTP and 2,3-di-O-geranylgeranyl-sn-glycero-1-phospha…
Using specially “designed” electrolytes, it is possible to obtain macropores even in highly doped n-type silicon (0.020–0.060 Ωcm) without illumination. Based on predictions of the “current-burst-model” [phys. stat. sol. (a) 182, 63 (2000), this issue], HF-containing electrolytes were systematically modified with stro…
The fine structure of the exciton ground level in a spherical nanocrystal of a zincblende or a wurtzite structure semiconductor was calculated with the inclusion of short-and long-range (nonanalytical), exchange-interaction components. The band-parameter dependence of the long-range exchange-interaction contribution t…
Strain-induced grain evolution in a 304 type austenitic stainless steel has been studied in multiple compression with the loading direction being changed in each pass. The tests were carried out to total strains above 6 at 873 K (0.5 T m) at a strain rate of about 10-3 s-1. Multiple deformation promotes the rapid form…
Temperature-dependent measurements of the photoluminescence (PL) intensity, PL lifetime, and infrared photocurrent, were performed on an erbium-implanted silicon p–n junction in order to investigate the energy transfer processes between the silicon electronic system and the Er 4f energy levels. The device features exc…
Microstructural changes caused by doping α‐Al 2 O 3 with small amounts of SiO 2 and TiO 2 added singly or together were investigated. When they were sintered at 1450°C for 120 min, singly doped samples developed equiaxed microstructures, but codoped material developed an anisotropic microstructure that contained plate…
The depolymerization of poly(ethylene terephthalate) (PET) by alcoholysis reaction is an easy operation and gives prospects for the valorization of wastes. PET waste was first depolymerized by glycolysis reaction at different molar ratios of diethylene glycol (DEG), in the presence of Mn acetate as a transesterificati…
The etching of various xerogel films has been studied in high-density fluorocarbon plasmas. The xerogel etch rate is in part enhanced by the porosity. In discharges resulting in low surface polymerization, such as CF4 or oxygen-rich fluorocarbon plasmas, an additional enhancement up to 60% is observed. When the polyme…
Exposure of metallic materials to carbonaceous gases can lead to (i) carburization, i.e. internal carbide formation causing embrittlement and failure especially at high temperatures of cracking tubes for olefine production, (ii) metal dusting, a disintegration of metals to a dust of carbon and fine metal particles, oc…
The pyridoxal 5'-phosphate (PLP)-dependent enzyme 1-aminocyclopropane-1-carboxylate deaminase (ACCD) catalyzes a reaction that involves a ring opening of cyclopropanoid amino acid, yielding alpha-ketobutyrate and ammonia. Unlike other PLP-dependent enzymes, this enzyme has no alpha-hydrogen atom in the substrate. Thus…
Epitaxial growth of thiophene/phenylene co-oligomers(e.g., see Figure) on uniaxially oriented poly(p-phenylene) (PPP) is reported. The emission properties of these co-oligomer thin films are investigated and compared to those of films grown on quartz. Color-tunable emission highly polarized along the direction of orie…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Highly Selective, One-Pot Multiple-Addition Convergent Synthesis of Polycarbonate DendrimersSteve P. Rannard and Nicola J. DavisView Author Information Courtaulds Corporate Technology, Coatings and Sealants P.O. Box 111, Lockhurst Lane, Coventry, CV6 5RS, UK Cite thi…
A technique to create templates for nanofabrication using thin films of diblock copolymers is discussed and demonstrated. Advanced lithographic techniques are used to create chemically patterned surfaces that manipulate the wetting behavior of diblock copolymer films and to guide the spatial microphase separation of t…
High resolution electron backscattered diffraction analysis has been used to compare the evolution of the deformed state during severe deformation of two model materials: an Al–0.13 wt-%Mg alloy and an interstitial free steel. The alloys were deformed by equal channel angular extrusion up to a total effective strain o…
Metastable impact electron spectroscopy (MIES) and ultraviolet photoelectron spectroscopy are used in this study to investigate low-defect and defective MgO(100) thin films. Unlike low-defect films, defective films exhibit a new spectroscopic feature located ∼2 eV above the top of valence band. Exposing the defective…
This paper reports the synthesis, crystal structures, and magnetic properties of two copper(II) complexes (1, 2) of general formula Cu(tfac)2(radical)2 (tfac = trifluoroacetate; radical = (1) 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (NITPh) or (2) 2-phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazoline-1…