Materials Literature
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Aging and life models based on growth of electrical trees in insulating materials and systems subjected to electrical stress are investigated. The models consider aging to be primarily a function of either the tree length or the intensity of discharges occurring within the trees. In terms of the latter quantity, a mod…
The glass structure and physical properties are reported for the nonconventional binary bismuth cuprate glasses of compositions (CuO${)}_{\mathit{x}}$(${\mathrm{Bi}}_{2}$${\mathrm{O}}_{3}$${)}_{100\mathrm{\ensuremath{-}}\mathit{x}}$, for x=27--70 mol %, prepared by the roller-quenching technique. It has been observed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOriented Immobilization of Fab' Fragments on Silica SurfacesBin. Lu, Jiamin. Xie, Chunlin. Lu, Changru. Wu, and Yu. WeiCite this: Anal. Chem. 1995, 67, 1, 83–87Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1…
[Mixed-metal oxide]/[Nafion] hybrid films were formulated via in situ sol-gel reactions for tetrabutyl titanate/tetraethoxysilane and for aluminum tri-sec-butoxide/tetraethoxysilane alkoxide pairs. Inorganic composition profiles across film thicknesses were investigated via X-ray energy dispersive spectroscopy with an…
Perovskite-related compounds in the series A2FeMO6(A Ca, Sr, Ba; M Nb, Ta, Sb) have been prepared using the standard techniques of solid state chemistry and characterized by X-ray powder diffraction, magnetometry and Mössbauer spectroscopy. All but the 6H hexagonal compound Ba2FeSbO6 adopt cubic or pseudo-cubic crysta…
Abstract Limited information has been published on Andisols in Iceland, but such data are important for understanding the erosional and periglacial processes that are intense in Iceland. The objectives of this research were to investigate Andisols that developed in tephra and eolian materials and that are highly susce…
Composites and Blends: Composite Applications in Commercial Transport Aircraft J.T. Quinlivan, H.R. Fenbert. High Performance Materials: Improved Mechanical Properties of Polymer Films Dried from the Swollen State in Uniaxial and Biaxial States of Strain J.E. Mark. Materials for Electronics: Optic Characterization of…
We consider the behaviour of liquid droplets at the liquid/vapour interface. We discuss the feasibility of drop entry into the interface in terms of the various interfacial tension in equilibrated systems, noting the thermodynamic constraints on equilibrium tensions; we also note the important possibility of the forma…
Metallothionein is a cysteine-rich metal-binding protein whose biosynthesis is closely regulated by the level of exposure of an organism to zinc, copper, cadmium, and other metal salts. The metallothionein from Callinectes sapidus is known to bind six divalent metal ions in two separate metal-binding clusters. Heteron…
Metals can exhibit dendritic short-circuits caused by electrochemical migration in conductor-insulator structures, which may result in failures and reliability problems in microcircuits. The classical model of electrochemical migration has been well known for several decades. This process is a transport of metal ions…
The forms of polyaniline, viz. pernigraniline, emeraldine and leucoemeraldine, their mutual transformations and their roles in the chemical polymerization of aniline, are discussed. Absorption spectra of its various protonated forms and corresponding bases are reported. A simple reaction scheme is proposed to account…
The presence of molecular oxygen is a determinant in the phototoxicity of phthalocyanines, and photosensitized oxidation is the accepted chemical mechanism for photo-dynamic action. However, it is difficult to establish whether the process is initiated by a type I electron transfer, or by a type II energy transfer rea…
Volume 1: Polymorphism in polypropylene homo- and copolymers. Molecular structure of polypropylene homo- and copolymers. Crystalline structures of polypropylene homo- and copolymers. Crystallisation, melting and supermolecular structure of isotactic polypropylene. Nucleation of polypropylene. Epitaxial growth on and w…
Fine-particle, sinter-active yttria has been prepared by combustion of a redox compound, Y(N2H3COO)3·3H2O and mixtures of Y(N2H3COO)3·3H2O–NH4NO3 or NH4ClO4 as well as yttrium nitrate and hydrazine-based fuels. The fineparticle nature of the combustion-derived yttria has been investigated using powder density, particl…
Since its discovery the process of mechanical alloying has demonstrated significant potential for the synthesis of materials with novel structures and properties. In this paper recent studies of the application of mechanical alloying to solid state refining processes are reviewed. These studies show that mechanical al…
New antibiotics were isolated from the culture broth of the myxobacterium, Sorangium cellulosum, strain So ce 678. The antibiotics were active against Gram-positive bacteria and mammalian cells. They were named tartrolon A and B. Tartrolon B contains a boron atom. The boron binding region of tartrolon is identical wit…
High-energy mechanical alloying of pure CeO2 and ZrO2 at room temperature results in the formation of a single phase Ce1–xZrxO2 fluorite structured solid solution in all the examined composition ranges; the compounds are characterized by a high oxygen storage capacity and an excellent reducibility.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox Behavior and Dispersion of Supported Chromium CatalystsBert M. Weckhuysen, Leo M. De Ridder, Piet J. Grobet, and Robert A. SchoonheydtCite this: J. Phys. Chem. 1995, 99, 1, 320–326Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-Bandgap Conducting Polymers Based on Conjugated Poly(heteroarylene methines). 2. Synthesis, Structure, and PropertiesWen-Chang Chen and Samson A. JenekheCite this: Macromolecules 1995, 28, 2, 465–480Publication Date (Print):January 1, 1995Publication History Published…
A series of new mono- and bi-nuclear rhenium(I) complexes, [Re(CO)3(N–N)L]ClO4 and [{Re(CO)3(N–N)}2L′][ClO4]2[where N–N = 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen) and L = 4-phenylazopyridine (phazo), 4-styrylpyridine (stypy), 4-pyridyl-2-ethylbenzene (NB); L′= 4,4′-azopyridine (azo), 1,4-bis(4-pyridyl-2-eth…