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 fluorescence behavior of 1,1′-dimethyl-2,2′-carbocyanine and p-N,N-dimethylamino-styryl-2-ethylpyridinium was investigated in several epoxy systems. Time-correlated single photon counting was used for all fluorescence measurements to obtain the rate constant for viscosity or mobility-dependent nonradiative process…
The kinetics of the polymerization of ε-caprolactone initiated with various Lewis acid metal alkoxides (Al, Zr and rare earths such as Y, Sm, Nd) in the presence of excess alcohol has been investigated. Whatever the metal, the activity depends strongly on the [Alcohol]/[Metal] ratio and goes through a maximum, except…
Partially phase-separated liquid-crystal/polymer dispersions display highly fibrillar domain morphologies that are dramatically different from the typical structures found in isotropic mixtures. To explain this, we numerically explore the coupling between phase ordering and phase-separation kinetics in model two-dimen…
The electron microscopy investigation of ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ shows that a complete charge disordering is induced in this phase by electron irradiation at 92 K, the disordered state remaining stable at this temperature, even in the absence of irradiation. A model is proposed for t…
Two series of alkyl-modified molecular sieves were prepared using the FSM-16 mesoporous silica. The attachment of alkyl groups to the surface, the structure of the bonded layer, and changes in the mesoporous structure of the FSM-16 material upon functionalization were studied by means of high-resolution thermogravimet…
The role of the pyridoxyl functionality on pyridoxal 5‘-phosphate (PLP)-dependent enzymatic decarboxylation of α-amino acids has been examined using ab initio calculations at electron-correlated levels of theory (MP2/6-31G(d) and B3LYP/6-31G(d)). The zwitterionic reactant intermediates involved are used to measure the…
We present the effects of applied coil power on silicon etching in a high density inductively coupled plasma etcher in both the isotropic and anisotropic regimes. The experimentally obtained response surfaces were generated while changing four etching variables for the isotropic case and eight etching variables for th…
Article BOND VALENCE SUM ANALYSIS (BVS) OF METAL LIGAND BOND LENGTHS IN SOME Zn(II), Cd(II) DITHIOCARBAMATE COMPLEXES AND THEIR ADDUCTS was published on July 1, 1999 in the journal Main Group Metal Chemistry (volume 22, issue 7).
Optical Constants in the Subgap Region and Vibrational Behaviour by Far-Infrared Spectroscopy of Wedge-Shaped Obliquely-Deposited Amorphous GeS2 Films, E Márquez, A M Bernal-Oliva, J M González-Leal, R Prieto-Alcón, J V Navarro, D Minkov
Abstract Poly(3-hexylthiophene) (P3HT) was prepared by the oxidation coupling polymerization of 3-hexylthiophene (3HT) with molecular oxygen as an oxidant in the presence of vanadyl acetylacetonate (IV) (VO(acac)2) and ferric chloride (FeCl3). The polymerization at a molar ratio of VO(acac)2 / FeCl3 / 3HT = 1 / 2 / 5…
Abstract The effect of the use of an unsaturated reactive plasticizer trimethylopropane trimethacrylate, TMPTMA, on the structure and the creep behavior of poly(vinyl chloride), PVC, plastisols has been investigated as part of a program to develop a high‐temperature creep‐resistant liner material. The crosslinking rea…
Single crystal Ag nanorods and elegant highly ordered dendriticsupramolecular nanostructures (see Figure) of Ag nanoparticles have been prepared via a novel ultraviolet photoreduction technique at room temperature using poly(vinylalcohol) (PVA) as protection agent. The concentration of both the PVA and AgNO3 play a si…
Bacteria can encounter a variety of physical conditions during their life. Bacterial cells are able to survive these (often adverse) conditions by the induction of specific or general protection mechanisms. The lactic acid bacterium Lactococcus lactis is widely used for the production of cheese. Before and during this…
An overview of the state of the art will be given. The tested, with crystalline powder filled amorphous and semiccystalline, also fiber reinforced polymeric materials are listed. Hints to the measurement technique, especially the X-ray analysis, will be mentioned. Examples of residual stresses in injection molded plat…
Abstract Electroactive composites consisting of a ferroelectric ceramic in a polymer matrix have gained much interest as compliant electromechanical or pyroelectric sensors. Of the various theoretical models developed to understand the dielectric and electroactive properties of composites, the majority are based on a…
We have studied the structure and magnetic transition with respect to the average size of the A site cations (rA) in the solid solution La0.6Ba4−xSrxMnO3. In this solution, the ratio Mn3+/Mn4+ is fixed a t 1.5. X-ray diffraction patterns show a phase transition from cubic to rhombohedra1 for 0.1≤x≤0.15. The variation…
We evaporated carbon bilateral rods containing different catalytic metals by AC arc discharge in He gas. No carbonaceous deposit was formed on either of the two electrodes, which meant that all of the evaporated carbon became soot in which single-walled nanotubes existed. It was clarified that the method is superior f…
Compression molding of sandwich components made from a novel material combination, glass/polypropylene faces and expanded polypropylene foam core, has been experimentally investigated. The aim of the study was to determine the processing window for this material concept in terms of shear, transverse tensile and flexur…
In October 1997 Manitoba Hydro experienced the flashover of a FRP hot stick during live line work at 500 kV AC. The paper describes the live line work which was being done, the weather and the condition of the hot stick. A series of tests were made to investigate factors which may have contributed to the flashover. Th…
Abstract Silanols bearing an asymmetric center on silicon, methyl(2-phenylethenyl)(3,3,3-trifluoropropyl)silanol and methyl(phenyl)(vinyl)silanol are synthesized by alkylative cleavages of cyclic siloxanes with an organolithium. Optical resolution of their enantiomers is performed by HPLC with a chiral stationary phas…