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。
Abstract— The photophysical and photochemical properties of thiophene derivatives have been studied by fluorescence and by 353 nm laser flash spectroscopy. α‐Terthienyl and its derivatives show a moderate fluorescence quantum yield (less than 0.1) in cyclohexane, ethanol, or TritonX–100 micelles. An additional thiophe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevelopment of modulated structure during solution casting of polymer blendsTakashi Inoue, Toshiaki Ougizawa, Osamu Yasuda, and Keizo MiyasakaCite this: Macromolecules 1985, 18, 1, 57–63Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Pub…
We present an X-ray study of the Peierls transition of the blue bronze K0.3MoO3, including the temperature dependence of the intensity of the first order and second order satellite reflections below Tc, a complete characterization of the structural fluctuations above Tc (both their temperature dependence and their ani…
Des particules spheroidales monodispersees de zircone et de zircone stabilisee par Y 2 O 3 , d'un diametre moyen de 0,2 μm, ont ete preparees par hydrolyse controlee d'alcoxydes de zirconium et d'yttrium. Les particules peuvent etre formees en pieces crues uniformement agglomerees qui sont frittees en ceramiques a gra…
A brief history of the literature dealing with cellulose microfibril assembly is presented, and a current summary of cellulose microfibril synthesizing complexes among eukaryotic cells is given. Terminal complexes not described before include the following: linear terminal complexes (TCs) with three rows in Eremosphae…
Polylactic acid microspheres containing doxorubicin were prepared by a solvent evaporation process and release patterns of the drug from the microspheres were examined in vitro. Microspheres with greater drug contents released more drug. The release rate of the drug after the initial burst was found to be small, so th…
Polyaniline was electrochemically doped to three electrically and spectroscopically distinctive forms; the closed valence-shell oxidized and reduced forms and the radical intermediate form.
The clinical effects of contrast agents not only result from high osmolality, but also from their own specific pharmacology, which mediates chemotoxic effects. In this review, the chemotoxic effects of the new nonionic agent, iohexol, are compared with those of standard ionic and other low osmolality contrast agents,…
Abstract Recent advances in the area of molecular diffusion in polymer‐solvent systems will be reviewed. Alfrey's classification scheme for the diffusion of solvent molecules in polymers will be used as a starting point. It will be shown that the various regions on Alfrey's diagram are distinguished by the ratio of tw…
High electrical powder conductivity (14 S cm–1 at 300 κ) and unusual temperature dependence were observed for a new tetrathiafulvalene (TTF) compound, [(TTF)2]+Cu+Cl2, which was prepared by oxidation of TTF with copper(II) chloride; the compound was characterized by e.s.r. and i.r. spectra as well as magnetic suscepti…
SAS4A is a new code system which has been designed for analyzing the initial phase of Hypothetical Core Disruptive Accidents (HCDAs) up to gross melting or failure of the subassembly walls. During such postulated accident scenarios as the Loss-of-Flow (LOF) and Transient-Overpower (TOP) events, the relocation of the f…
La sidwillite MoO3.2H2O a été rencontrée sur des échantillons de quartz filonien de Lake Como, Colorado, U.S.A. ; elle y est associée à de la pyrite assez rare et de la jordisite dont elle dérive par oxydation. Les cristaux sont monocliniques P21/n avec a = 10,618(5), b = 13,825(7), c = 10,482(5) Å, β = 91,61(4)°, V =…
A novel and simple method is described for evaluation of molecular weight – viscosity relationships for a polymer where only broad molecular weight distribution samples are available. The method demands measurement of the intrinsic viscosity and GPC chromatograms of several samples. Results of applying the procedure t…
A comparison has been made from the practical point of view between the two computer-search-match programs of Johnson/Vand (G. G. Johnson, and V. Vand. Ind. Eng. Chem. 59, 19. (1967)) and SANDMAN (W. N. Schreiner. C. Surdukowski & R. Jenkins. J. Appl. Cryst. 15, 513 (1982) ), both of which have been routinely used in…
Abstract A new stereospecific intramolecular hydride transfer, induced by an alkoxide, has been demonstrated under NCI/OH − conditions using unimolecular and collision‐induced decomposition spectra.
The Al–C bond of Al(TPP)(Et)(TPP = tetraphenylporphyrinato) is homolytically cleaved upon visible light photolysis in benzene in the presence of an excess of 2,4,6-tri-t-butylnitrosobenzene, yielding spin adducts of Al(TPP) and ethyl radicals with a quantum yield of the order of 10–3.
Laudatio.- On polymer solution thermodynamics.- Interaction between block copolymer micelles in solution.- Temperature - concentration dependence of polyvinyl acetate gels with respect to the collapse phenomenon.- Polymorphic phase transition and monomolecular spreading of synthetic phospholipids.- Adsorption-entangle…
Abstract
The suitability of 6%V Permalloy as magnetic head core materials for use in the digital tape-recording unit of an electronic computer has been investigated with respect to important requirements for the core materials such as effective permeability in a high frequency field, stress-sensitivity in magnetic permeability…
An analysis of grain boundary sliding is made based on the hypothesis that the rate-limiting process involves, overall, the climb-limited movement along grain boundaries of lattice dislocations, which originate in the grain interiors. Reasonable values are calculated for the contribution of grain boundary sliding to t…