Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface force measurements of polystyrene-block-poly(ethylene oxide) adsorbed from a nonselective solvent on micaDavid Guzonas, Daniele Boils, and Michael L. HairCite this: Macromolecules 1991, 24, 11, 3383–3387Publication Date (Print):May 1, 1991Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new configuration of 12-crown-4Edward T. Seidl and Henry F. Schaefer IIICite this: J. Phys. Chem. 1991, 95, 9, 3589–3590Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://pubs.acs.org/doi/10.1021/j100162a02…
Abstract Thermal, dielectric, and mechanical relaxation measurements on miscible blends of polybenzimidazole (PBI) and a polyetherimide (PEI, Ultem 1000) prepared by solution casting from dimethylacetamide (DMAc) reveal a number of structurally related features. Annealing below the glass transition temperature induces…
Two-component liquid crystalline (LC) mixtures containing LC diacrylates and chiral molecules with no reactive groups were made. Upon photopolymerisation of the mixtures, cholesteric networks containing up to 28% w/w chiral molecules which were not chemically attached to the networks were created. Temperature dependen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclynes. 9. Regioselective coupling of ethynylcyclopropane units: hexaspiro[2.0.2.4.2.0.2.4.2.0.2.4]triaconta-7,9,17,19,27,29-hexayneArmin De Meijere, Frank Jaekel, Arndt Simon, Horst Borrmann, Jurgen Koehler, Dan Johnels, and Lawrence T. ScottCite this: J. Am. Chem. Soc. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced porphyrin-to-quinone electron transfer across oligospirocyclic spacersSpencer Knapp, T. G. Murali Dhar, Jennifer Albaneze, Steve Gentemann, Joseph A. Potenza, Dewey Holten, and Harvey J. SchugarCite this: J. Am. Chem. Soc. 1991, 113, 10, 4010–4013Publication Dat…