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 cohesive properties of some actinide metals (thorium, protoactinium and uranium), and of their oxides ThO2 and UO2, were studied by means of the linear muffin-tin orbital method in the atomic sphere approximation. This method gives accurate predictions of the stability of the close-packed structures, but it is fou…
Symmetrically configured a.c. light-emitting (SCALE) ‘5-layer’ devices having the configuration M/EB/P/EB/ITO, where M = Al, Cu or Au, EB = polyaniline (emeraldine base), P = poly(2,5-dihexadecanoxy phenylene vinylene pyridyl vinylene) or PPV-PPyV, and ITO = indium-tin oxide glass, show electroluminescent properties i…
Spectroscopic and electrochemical properties of cobalt phthalocyanine (CoPc) polymers, which are believed to have two‐ and three‐dimensional structures, have been studied and the results are reported. The spectral bands are shifted and a significant band broadening is observed as expected. The cyclic voltammetric resu…
We report measurements of the thermopower of the single-crystal manganite perovskite ${\mathrm{Nd}}_{1\ensuremath{-}x}{(\mathrm{S}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{P}\mathrm{b})}_{x}\mathrm{Mn}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ from 4.2 to 350 K at zero and finite magnetic field. The sign and…
An interfacial diffusion method was devised to reduce insulation thickness by improving the interfacial properties of XLPE cable insulation. This method is based on a proposed concept of the facilitation of oriented lamellar growth at the interface by addition of special ingredients to the semiconducting layer, which…
Poly{4,4′-(1-methylethylidene)bisphenylene 3-[4-(4-nitrophenylazo)phenyl]-3-aza-pentanedioate} (pMNAP) was synthesized through the condensation polymerization of 4,4′-isopropylidene-bis-phenol and N-[4-(4-nitrophenylazo)phenyl]imido diacetyl chloride. The polymer solution in tetrahydrofuran (THF) was spin-coated onto…
A Zn–22 wt-% Al alloy was superplastically deformed in the optimal range to obtain experimental evidence based on scanning electron and transmission electron microscopy for mesoscopic grain/interphase boundary sliding and plane interface formation that facilitates the cooperative boundary sliding process. It was seen…
The free surface of a cholesteric oligomer, examined by Atomic Force Microscopy, shows a periodic relief that is in relation to the half helical pitch. A thorough discussion of this relief and of the structure of the interfacial region which result from the interplay between the surface tension and the anchoring and d…
Abstract Two computer codes for simulating the backscattered, transmitted, and secondary‐electron signals from targets in a scanning electron microscope are described. The first code, MONSEL‐II, has a model target consisting of three parallel lines on a three‐layer substrate, while the second, MONSEL‐III, has a model…
Light-induced molecule reorientation in dye-doped liquid crystals has been applied to nonlinear spatial filtering of periodic patterns. Photoisomerization of azo-dye molecules leads to local alignment changes in the liquidcrystal molecules because of interaction among the molecules. Consequently the polarization of tr…
Electrical currents trigger oxidation or reduction reactions in conducting polymers. Changes in volume associated with these redox processes can be transformed into macroscopic movements of more than 180° by the construction of a bilayer: polypyrrole-flexible and inactive polymer (artificial muscle). The effects of th…
Factors affecting the self‐discharge rate of a nickel/metal‐hydride (Ni‐MH) battery, generally much higher than that of nickel/cadmium (Ni‐Cd) battery, are investigated, and the self‐discharge mechanism is discussed. Ammonia and amine participate in the shuttle reaction like nitrate ion in the Ni‐Cd battery, resulting…
Functional organic dyes provide a direct link between electronics and optics. The supramolecular packing of a given chromophore plays an important role in the functional properties of a material. A highly substituted, soluble quinacridone (see Figure) is presented for which the aggregation process can be directly prob…
Abstract Water‐soluble polydepsipeptides with functionalized side‐chain groups, i.e., alternating copolymers, consisting of glycolic acid (Glc) and L ‐lysine ( L ‐Lys), L ‐aspartic acid ( L ‐Asp) or L ‐glutamic acid ( L ‐Glu) residues as α‐hydroxy acid and α‐amino acid residues, respectively, were synthesized, and the…
Two kinetically distinct types of oxygen atoms can be identified during the isothermal oxidation of CO on Pt(111) even though they all sit in identical sites at the start of the reaction. This is explained by a lowering in the reaction activation barrier with oxygen islanding.
Steel samples exposed to a 5% sodium chloride (NaCl) solution containing 0.5% acetic acid (CH3COOH) saturated with hydrogen sulfide (H2S), with and without imidazole (C3H4N2) as an inhibitor, were analyzed by x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). The metal surface was cover…
A suggestion is advanced that the stable bubble clusters observed by Marston et al. [Bubble Dynamics and Interface Phenomena, edited by J. R. Blake et al. (Kluwer Academic, Dordrecht, 1994), pp. 343–353] in an ultrasonic field are due to the radiative interaction forces of the bubbles, which change from attraction to…
The crystal structure of bismuth compounds was established by Aurivillius and the general formula (Bi2O2)2+(Mn−1RnO3n+1)2− indicates that n (1 to 6) perovskite-like layers. M is a cation of 1, 2 or 3 valency and R is a smaller cation of 3, 4, 5 or 6 valency. The properties of a large number of compounds of this family…
Textile composites are known to have improved out-of-plane properties and impact resistance. However, detailed analysis of textile composites is very difficult to perform due to the geometric complexity. In the present study, a practical computational procedure based on a global/local finite element method was develop…
Dynamic observation of surface charge distribution is the main advantage of the electro-optical Pockels effect technique over the dust figure technique, the photographic Lichtenberg figure technique, and the static potential probe scanning method. This technique is demonstrated here to observe the surface charge distr…