Morphology of polymers
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Matrix isolation ESR and theoretical investigations of 11B14N11B and 10B14N11B: laser vaporization generation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix isolation ESR and theoretical investigations of 11B14N11B and 10B14N11B: laser vaporization generationLon B. Knight Jr., Devon W. Hill, T. J. Kirk, and C. A. ArringtonCite this: J. Phys. Chem. 1992, 96, 2, 555–561Publication Date (Print):January 1, 1992Publication His…
Sintering and Dielectric Properties of BaTiO<sub>3</sub>-Ni Composite Ceramics
BaTiO3-Ni mixed powders were sintered at 1300°C in Ar or air, and the sintering behavior and dielectric properties were investigated. The bulk density of sintered bodies was 95-99% of theoretical. BaTiO3-Ni composites were produced in Ar. When coarse Ni powder (4-7μm) and ultrafine BaTiO3 powder (0.02μm) were used, a…
Structure Determination of the ζ<SUB>2</SUB>′ Martensite and the Mechanism of β<SUB>2</SUB>→ζ<SUB>2</SUB>′ Transformation in a Au-49.5 at%Cd Alloy
The crystal structure of the ζ2′ Au-49.5 at%Cd martensite, which has been controversial for 50 years, has been determined by using single crystal data collected by four-circle diffractometer with Mo Kα radiation. The space group is P3, trigonal, which has no center of symmetry. This result is in disagreement with that…
Growth of mineral crystals in turkey tendon collagen fibers
Bone and several other vertebrate mineralized tissues are formed by the organized growth of crystals of carbonated apatite within a matrix of type 1 collagen fibers. The development of this process in isolated fibrils of young turkey leg tendons has been studied by transmission electron microscopy. Collagen banding, p…
DNA intercalation and photosensitization by cationic meso substituted porphyrins
Several cationic porphyrins are known to bind to DNA by intercalative and outside binding modes. This study identifies the cis and trans isomers of bis(N-methyl-4-phridiniumyl)diphenyl porphyrin as DNA intercalators based on evidence from a DNA topoisomerase I assay. Moreover, both isomers are shown to be potent photo…
Liquid crystalline aromatic polyesters derived from 2,5-thiophene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystalline aromatic polyesters derived from 2,5-thiopheneRubing Cai, Jack Preston, and Edward T. SamulskiCite this: Macromolecules 1992, 25, 2, 563–568Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 19…
Regeneration of Pericardial Tissue on Absorbable Polymer Patches Implanted into the Pericardial Sac: An Immunohistochemical, Ultrastructural and Biochemical Study in the Sheep
A new absorbable polymer prepared from polyhydroxybutyrate (PHB) was inserted as a pericardial patch in sheep to serve as a temporary scaffold for regeneration of pericardial tissue. Postoperative adhesions were rare or absent. The present study focuses on characterization of the regenerated surface cells. The luminal…
Metal–support interaction in Pd/CeO 2 catalysts: Fourier-transform infrared studies of the effects of the reduction temperature and metal loading. Part 1.—Catalysts prepared by the microemulsion technique
The effect of the temperature of reduction by H2 of Pd/CeO2 catalysts on the accessibility of the metal to carbon monoxide adsorption has been estimated from a study of the integrated intensity of the ν(CO) absorption bands. No adsorption occurred when the reduction temperature was higher than 673 K; the behaviour of…
Organic sulfur chemistry : biochemical aspects
Biochemical Aspects of Microbial Oxidation of Inorganic Sulfur Compounds (Susumu Takakuwa). Sulfur Ligand in Metalloproteins and Metalloenzymes (Norikazu Ueyama and Akira Nakamura). Biochemical Reactions Involving Thioesters (Kenji Ogino and Hisashi Fujihara). Biochemistry of Disulfide (Yong Hae Kim). Oxygenation and…
Crystal structure and electrical properties of κ‐((S,S)‐DMBEDT–TTF)2ClO4
The existence of superconductivity in chiral molecular systems is suggested by studies of the title compound. The work, which is an important extension of studies of recently organic superconductors based on unsymmetrical molecules, shows that a sudden, but incomplete loss of resistivity (by a factor of 500) takes pla…
Feature article. Organic-intercalated halogenochromates(II): low-dimensional magnets
Ferromagnetism in non-metallic solids is quite a rare property. In solids containing molecular building blocks it is even rarer. One strategy for preparing ionic ferromagnets is to combine a low-dimensional continuous lattice containing transition-metal ions with organic molecular ions. In this article we review the s…
Interaction between α-Alumina Surface and Polyacrylic Acid
Properties of α-alumina surface, dissociated fraction of polyacrylic acid, and the interaction between alumina surface and polyacrylic acid were investigated in aqueous suspensions in the pH range of 2.2 to 10.5. The isoelectric point of the colloidal α-alumina particles was pH 7.7, and the surface was charged positiv…
Partial discharge. X. PD in gas-insulated substations-measurement and practical considerations
For pt.IX see ibid., vol.7, no.6, p.5 et seq. (1991). An overview of engineering practice related to partial discharge (PD) measurements in gas-insulated substations (GISs) is provided. The following questions are addressed: why measure PD in GIS?; in which phases of the life cycle should PD be measured?; what PD meas…
An imaging plate system for high-pressure powder diffraction: The data processing side
The use of an imaging plate as a two-dimensional (2-D) detector removes many of the difficulties that arise in performing angle-dispersive powder diffraction at high pressures in a diamond-anvil cell. Due to the 2-D nature of the imaging plate, a substantial part of each Debye Scherrer ring is intercepted and recorded…
The first example of a tridentate azamacrocyclic metallomesogen
The introduction of a metal into a mesogenic molecule can result in a complex with interesting electrical and magnetic properties. By reacting the non‐mesogenic cyclic amine shown in the figure with Ni(NO 3 ) 2 · 6H 2 O in absolute THF the first member of a new class of columnar liquid‐crystalline metal complexes with…
Effect of Thermal Cycling on the Martensitic Transformation in an Fe–24Mn–6Si Shape Memory Alloy
The effect of γ\ ightleftarrowsε cyclic transformation on the subsequent γ→ε martensitic transformation has been studied in an Fe-24%Mn-6%Si shape memory alloy in order to obtain fundamental information on the role of Si in the shape memory effect. The γ→ε martensitic transformation is markedly enhanced by the thermal…
Mixtures of rigid and flexible nematogenic polymers
We consider three systems containing rigid and/or flexible main-chain nematogenic polymers: mixtures of a rigid and a flexible polymer, mixtures of two different rigid polymers, and a system of diblocks of rigid and flexible pieces. The flexible components are modeled as chains with freely rotating bonds, while the ri…
Novel colloidal polyaniline–silica composites
We have prepared novel colloidal polyaniline–silica composites by chemically polymerising aniline in the presence of small silica particles of 38 ± 7 nm diameter; these composites have been characterised by various techniques including thermogravimetry micoanalyses, scaning, electron microscopy, photon correlation spe…
Miscibility and phase separation in poly(methyl methacrylate)/poly(vinyl chloride) blends: study of thermodynamics by thermal analysis
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and phase separation in poly(methyl methacrylate)/poly(vinyl chloride) blends: study of thermodynamics by thermal analysisSunny Shen and John M. TorkelsonCite this: Macromolecules 1992, 25, 2, 721–728Publication Date (Print):January 1, 1992Publication History Pub…