Materials Literature
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Three different types of iron oxo‐hydroxo colloids with well‐defined sizes and chemistries have been synthesized by hydrolysis of Fe(III) in acidic and alkaline medium as well as by oxidative hydrolysis of Fe(II), resulting in solutions of β ‐FeOOH (30 nm), a hexanuclear complex (HN; 2 nm), and a polynuclear oxidation…
By reacting CuSatnOH (CuSatnOH = [N-(3-aminopropyl)salicylaldiminatoh]y droxocopper(I1)) with rare-earth hexafluoroacetylacetonates (hfac), complexes of general formula Ln(hfac)$uSatnOH (Ln = Gd, Dy) were obtained. The crystal structure of the dysprosium derivative was determined through X-ray diffraction at room temp…
Abstract Blends of polyethylene (PE) and polyamide (PA) were prepared by a melt mixing process. The dependence of the number average size A n of the dispersed phase on hydrodynamic conditions not only of shear rate but also temperature, inter‐facial tension, viscosity of the blends (WU's treatment), and dispersed phas…
Abstract 1,2-Bis(benzo[b]thiophen-3-yl)ethene derivatives, which possess thermally irreversible and fatigue resistant photochromic properties, were synthesized, cis-1,2-Dicyano-1,2-bis(2-methylbenzo[b]thiophen-3-yl)ethene 1a and 2,3-bis(2-methylbenzo[b]thiophen-3-yl)maleic anhydride 2a underwent reversible photocycliz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric hydroxylation, epoxidation, and sulfoxidation catalyzed by vaulted binaphthyl metalloporphyrinsJohn T. Groves and Peter ViskiCite this: J. Org. Chem. 1990, 55, 11, 3628–3634Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published…
The specular reflectivity of neutrons has been used to characterize quantitatively the microphase separated morphology of symmetric, diblock copolymers of polystyrene (PS), and polymethylmethacrylate (PMMA), as a function of the total molecular weight of the copolymer where either block is perdeuterated. It is shown t…
Effects of various substituents including chromophores on the second harmonic generation (SHG) of Cyanovinylheteroaromatics were examined. The molecular polarizability was calculated by the PPP MO method to correlate SHG responsiveness with chemical structures. 3-[(2-cyano-2-ethoxycarbonyl)ethenyl]indole 8b exhibited…
The vibronic absorption bands with zero-phonon lines at 1·40, 1·883, and 2·51 eV, the broad absorption band with a maximum near 1·4eV and the series of absorption lines near 3·1 eV, the vibronic luminescence bands with zero-phonon lines at 1·40eV and 2·56 eV, all associated with nickel-related optical centres in synth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural transformation of non-oxide chalcogenide glasses. The short-range order of lithium sulfide (Li2S)-phosphorus pentasulfide (P2S5) glasses studied by quantitative phosphorus-31, lithium-6, and lithium-7 high-resolution solid-state NMRHellmut Eckert, Zhengming Zhang,…
We review the development of a strain rate and temperature dependent plasticity model for finite deformation. In particular we address both the method of determining the parameters of the model and the engineering meaning of the parameters in terms of uniaxial stress-strain curves. The ability of the model to predict…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen quenching of electronically excited hexanuclear molybdenum and tungsten halide clustersJulie A. Jackson, Claudia. Turro, Mark D. Newsham, and Daniel G. NoceraCite this: J. Phys. Chem. 1990, 94, 11, 4500–4507Publication Date (Print):May 1, 1990Publication History Publi…
Data have been compiled on the cross sections for the collisions of electrons and photons with atomic oxygen (O). The processes considered are total scattering, elastic scattering, momentum transfer, excitations of electronic states (including fine structure levels of the ground state), ionization, and electron attach…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron microscopy study of delamination in dispersions of the perovskite-related layered phases K[Ca2Nan-3NbnO3n-1]: evidence for single-layer formationM. M. J. Treacy, S. B. Rice, Allan J. Jacobson, and J. T. LewandowskiCite this: Chem. Mater. 1990, 2, 3, 279–286Publicati…
A low resistivity and high transmittance Sn doped In2O3 (ITO) film was formed on a glass substrate by dc magnetron sputtering and lower sputtering voltage gave a lower resistivity film. At a sputtering voltage of −250 V, the resistivity obtained was 5.0×10−4Ω cm for room temperature substrate, 2.0×10−4Ω cm for 160 °C…
Genetic and protein engineering are components of a new polymer chemistry that provide the tools for producing macromolecular polyamide copolymers of diversity and precision far beyond the current capabilities of synthetic polymer chemistry. The genetic machinery allows molecular control of chemical and physical chain…
Sintering experiments at constant heating rates were employed to estimate the activation energy for sintering in alumina and in alumina containing 5 vol% zirconia or 5 vol% titania. Grain growth, which can complicate the analysis of sintering kinetics data, was suppressed by using uniformly and densely packed grain co…
The micromechanics involved in increased crack growth resistance, K R , due to the addition of TiB 2 particulate in a SiC matrix was analyzed both experimentally and theoretically. The fractography evidence, in which, the advancing crack was attracted to adjacent particulates, was attributed to the tensile region surr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater soluble hyperbranched polyphenylene: "a unimolecular micelle?"Young H. Kim and Owen W. WebsterCite this: J. Am. Chem. Soc. 1990, 112, 11, 4592–4593Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs…
The self‐assembly of intelligent supermolecular materials , for example, liquid crystalline polymers, is the subject of this communication. Employing units based on tartaric acid in the molecular recognition process (see figure) allows the effects of chirality to be investigated as the recognition which occurs at a mo…
An ultrasmall superparamagnetic iron oxide (USPIO) preparation was developed that is small enough to migrate across the capillary wall, a prerequisite in the design of targetable particulate pharmaceuticals. Seventy percent of particles were smaller than 10 nm; 26%, smaller than 5 nm. The blood half-life of USPIO in r…