Materials Literature
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The fractions of absorbed, backscattered, and transmitted electrons bombarding a thin solid film are calculated as functions of the film thickness both in the absence and in the presence of a substrate. The depth distribution of the absorbed electrons has also been calculated.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductive polymeric porphyrin films: application in the electrocatalytic oxidation of hydrazineJ. E. Bennett and T. MalinskiCite this: Chem. Mater. 1991, 3, 3, 490–495Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection of branching on poly(vinyl fluoride) by NMR and the effect of synthesis conditions on polymer structureDerick W. Ovenall and Ronald E. UscholdCite this: Macromolecules 1991, 24, 11, 3235–3237Publication Date (Print):May 1, 1991Publication History Published online1…
Microlens effects have been obtained in homogeneously aligned liquid crystal cells prepared using a hole-patterned electrode and a plane electrode. In the asymmetric electrode structure, an axially symmetric non-uniform electric field is produced and a radial distribution of refractive indices can be obtained by the m…
We present a method to calibrate the profile of Al mole fraction versus depth, deposited in growth of graded AlxGa1−xAs alloys in a molecular-beam epitaxy machine. A computer is used to either ramp the Al oven temperature (analog alloy), or pulse the Al beam (digital alloy), with a fractional monolayer depth resolutio…
Magnetic hysteresis is found at the first-order spin-flop transition in ${\mathrm{K}}_{2}$Fe(${\mathrm{Cl}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Br}}_{\mathit{x}}$${)}_{5}$\ensuremath{\cdot}${\mathrm{H}}_{2}$O (x=0.1, 0.2, and 0.3). From measurements of the ac susceptibility \ensuremath{\chi} and from a stud…
The purified compound, 4', 5, 6, 7-tetramethoxyflavone, is an active ingredient isolated from Eupatorium odoratum, a Thai indigenous plant that has long been used to stop bleeding. This compound was studied in vitro for the effect on blood clotting factor activities. It was found that the compound enhanced blood coagu…
Chemically vapor deposited (CVD) diamond films have been deposited on quartz substrates using a configuration in which the substrate is placed parallel to the direction of the gas flow in the deposition system. Spatially resolved Raman spectroscopy and optical microscopy of the resultant films revealed that (a) as the…
Abstract With the addition of 20 phr of BR granulate grafted with ethyl acrylate by the redox or gamma irradiation method to polyacrylic rubber compound, the properties of the rubber worsened, but remained within the range of properties characteristic for these types of rubber. The stability of rubber against swelling…
Abstract Iron(III) complexes of [FeL]BPh4·acetone containing the hexadentate ligand derived from triethylenetetramine and salicylaldehyde have been synthesized. These complexes were grown in two crystalline forms, monoclinic and the twin crystals. The crystal structure of the monoclinic form was determined at 290 K, a…
The role of scattering of the incident excitation electrons is examined by use of judiciously chosen scattering geometries that allow for the experimental separation of incident-beam effects and Auger-electron-scattering effects. The scattering of 4-keV incident electrons can result in variations greater than 25% of t…
Eine ellipsoidförmige Schale aus 30 verknüpften tetragonalen VO 5 ‐Pyramiden (Strukturbild rechts; gefüllte Kreise V, leere Kreise O), die einen verzerrten {V 4 O 4 }O 4 ‐Kubus umhüllt, liegt in der Titelverbindung vor. Dieser Cluster ist jedoch nicht nur topologisch von Interesse: Seine magnetischen Eigenschaften mac…
Abstract The permeability of annealed poly ( l ‐(trimethylsilyl)‐ l ‐propyne) was studied from the viewpoint of structural information obtained from x‐ray diffraction and density. The sample cast from benzene solution had low density (0.82 g/cm 3 ) and high permeability, whereas the annealed sample had a higher densit…
Abstract The photochromic responses of mixed WO 3 – MoO 3 thin films subjecting to UV irradiation were investigated in reducing environments, and they were compared with those of WO 3 and MoO 3 thin films. It was found that the photochromism of mixed 92% WO 8% MoO 3 thin film in ethanol vapor was significantly enhance…
Al films were vapor deposited in high vacuum onto SiO2/Si substrates at various substrate temperatures (T) and deposition rates (R) which ranged, respectively, from 24 to 250 °C and from 2 to 90 Å/s. The films were examined by scanning electron microscopy (SEM) and showed systematic variations in topography. Hillock f…
Abstract The bonding of several black-filled natural rubber vulcanizates to brass-plated steel cord was investigated using the TCAT pullout geometry. Compositions using either cobalt naphthenate or an HR bonding system (hexamethoxymethyl melamine plus RFR) had higher pullout forces than a control without these agents.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of the .pi.-bonding ability of imidazole: structure determination and characterization of catena-(H2O)2(1-CH3im)2Mg(.mu.-CN)(CN)4(1-CH3im)Fe(III).cntdot.H2O (1-CH3im = 1-methylimidazole)Craig R. Johnson, Colleen M. Jones, Sanford A. Asher, and Jaime E. AbolaCite t…
Interfacial reactions of SiC with selected high temperature metals have been studied at temperatures between 1000 and 1200 °C for various times. The metals include Nb, a strong carbide former, Ni, Co, and stainless steel. Reactions of the metals with SiC in this temperature range were extensive; various metal silicide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond time-resolved fluorescence spectroscopy of the photochromic reaction of spiropyran in Langmuir-Blodgett filmsTakahide Minami, Naoto Tamai, Tomoko Yamazaki, and Iwao YamazakiCite this: J. Phys. Chem. 1991, 95, 10, 3988–3993Publication Date (Print):May 1, 1991Public…
Abstract 19 F chemical shifts are reported for a series of alkyl‐substituted fluoronaphthalenes and related compounds that exhibit steric crowding around the fluorine atom due to the proximity of methyl groups. Comparisons of these chemical shifts with others measured in similar compounds but without the corresponding…