Materials Literature
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It is shown that the properties of the upper critical fields in organic superconductors can be understood in terms of pure type II superconductivity. The experimental observation of high critical fields violating Clogston's criterion could give support in favour of triplet-paired superconductivity.
Several new series with the general formula [graphic] in which R2 is a lateral unbranched or branched chain of up to considerable length, were prepared. The compounds exhibit nematic properties. With the aid of molecular statistical theories and other arguments, we discuss the conformations of the lateral substituents…
Cynometallates display molecular sieving properties, which can be predicted on the basis of their specific structure; very effective separations of C6 isomers and of CO2–CH4 mixtures are reported.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipotassium bis([8]annulene)ytterbate(II) and -calcate(II)Steven A. Kinsley, Andrew Streitwieser Jr., and Allan ZalkinCite this: Organometallics 1985, 4, 1, 52–57Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue 1 January…
Tetra-2,3-pyridinoporphyrazines (29H,31H-tetrapyrido[2,3-b : 2′,3′-g : 2″,3″-l : 2‴,3‴-q]porphyrazine)(1) and the corresponding water-soluble NN′N″N‴-tetramethylated quaternized tetracationic forms (2) with different central metal atoms were prepared and their photoredox activities investigated. The synthesis of (2; M…
The synthesis of a discogen based on a phthalocyanine on a phthalocyanine subunit is described; the discogen shows C2v symmetry and possesses a high permanent electric on dipole moment within the plane of the aromatic macrocyclie, leading to a new type of discotic mesophase.
A major investigation of the oxygen-deficient perovskite phase SrFeO3–y(0.15 < y < 0.25) has been carried out using 57Fe Mössbauer spectroscopy, X-ray powder diffraction, and magnetic susceptibility measurements. The Mössbauer spectra have been recorded for a variety of samples at many temperatures in the range 4.2–90…
A new material design method of laminated fibrous composite plates with required flexural stiffness is proposed. The selection of kinds of fibers and matrices and the determination of fiber orientation angles can be done directly from the imposed conditions on flexural stiffness of laminated plates. The laminated comp…
A phenomenological model for frustrated smectics with competition for order at incommensurate wavevectors k1 and k2 is used to study phase diagrams and x-ray scattering intensity within mean field theory. It is shown that in addition to the nematic (N) and monolayer (SA1) phases, the phase diagram may involve two dist…
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…