Materials Literature
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Two magnetic molecular clusters containing almost coplanar rings of iron (III) ions with spin S=5/2 have been investigated by $^{1}\mathrm{H}$ NMR and relaxation measurements. The first system, which will be referred to as Fe6, is a molecule of general formula [${\mathrm{NaFe}}_{6}$(${\mathrm{OCH}}_{3}$${)}_{12}$(${\m…
Abstract An epoxy based polymer with nonlinear optical azo chromophores was designed to contain anionic groups to induce water solubility and self assembly. Using this polyanion with a polycation, multilayers were prepared on a glass substrate by alternating adsorption from dilute aqueous solutions. The azo chromophor…
Ultrathin films of a symmetrical polystyrene- block -poly(2-vinylpyridine) diblock copolymer with a degree of polymerization of 600 were prepared by spin coating from a nonselective solvent, i.e., CHCl 3, on mica. The concentration of the casting solutions was chosen to be too low to allow homogeneous coverage of the…
Abstract— Microstructure and mechanical properties of HP (Hot Pressed), HP/GP (Gas Pressed), and HP/HIP (Hot Isostatic Pressed)—Si 3 N 4 are studied using scanning electron microscopy, bending tests and the indentation fracture method. The grain diameter distribution is analyzed to clarify the relationship between mic…
The impact sensitivity of liquid nitroglycerin, 50% initiation level, was observed to be near 1.8 kg∗cm or 3.3 × 103 j/m2. The impact sensitivity of solid nitroglycerin, 50% initiation level, was observed by extrapolation to be near 200 kg∗cm or 4.4 × 105 j/m2. The impact sensitivity of a mixture of solid and liquid N…
A new manganite (${\mathrm{La}}_{0.7}$${\mathrm{Sn}}_{0.3}$${)}_{2}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ has been discovered that exhibits colossal magnetoresistance (CMR) near the Curie temperature and semiconductor-metal transition temperatures similar to that of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$…
The 119Sn magic angle spinning NMR spectra of the three tin sulfides SnS, SnS2 and Sn2S3 are discussed with respect to results from x-ray structure analysis. The distortion from an octahedral environment of tin in SnS and Sn(II) in Sn2S3 is reflected in the large chemical shift anisotropy. The denser coordination sphe…
Abstract ZnO films have been prepared by alternate supply of zinc acetate and H2O. A rate of film growth is nearly equal to an ideal rate expected for atomic layer epitaxy when both zinc acetate and H2O are sufficiently supplied. The morphology of ZnO films is affected by amount of zinc acetate and H2O per cycles.
ABSTRACT Diatom material from South Africa and Swaziland was examined with light and scanning electron microscopy. Five new taxa are proposed: Gomphonema crocodilei, G. quasicrocodilei, G. venusta, G. latistigmata, and G. cholnokyi. Gomphonema venusta has been previously misidentified as Gomphonema clevei Fricke and G…
Revised nomenclature, a new key to the species, improved classification, diagnostic characteristics, geographic distribution and habitat of Periploca L. and its fourteen species are presented. Cyprinia Browicz is reduced to synonymy with Periploca.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNovel Photocoupling Reaction in Two-Component Crystals of Tetracyanobenzene with Benzyl CyanideYoshikatsu Ito, Sotaro Endo, and Shigeru OhbaView Author Information Department of Synthetic Chemistry & Biological Chemistry Faculty of Engineering Kyoto University, Kyoto 6…
States that duplex (austenitic/ferritic) stainless steels offer properties of interest and a cost‐effective material selection solution for plant and equipment in the pulp and paper industry. Reviews characteristics of duplex steels leading to successful long‐term applications of 22 Cr duplex and a copper containing 2…
We report on an unexpected domain of high Coulombic efficiency for electrochemical oxidation of aluminum in aqueous polysulfide solutions at high current density for the process: Al + 3OH - → Al(OH) 3 + 3e - . This high-efficiency domain, of importance to battery processes, includes aluminum oxidation in a wide range…
In most electrochemical capacitor applications it is necessary to series a set of capacitors (cells) to obtain a single capacitor capable of operating at a desired voltage. Performance modeling of these devices has proven difficult because of their nonideal behavior and the need to series a large number of equivalent…
Because of thermocapillary flow or other mechanisms, particles move in temperature and concentration gradients. In a system undergoing a first-order phase transition via nucleation and growth, such gradients are caused by particles themselves. This leads to a long-range interaction in which particles will attract or r…
The characteristics of flash-deposited and thin-film thermoelectric generators are described. The overall Seebeck coefficient for a single couple in the generator ( forming the n-type thermoelement and forming the p-type element) is . This value approaches the figures presented for these materials in bulk form. The re…
Magnesium hydroxide sulfate [2MgSO 4 .Mg(OH) 2 ; MHS] is tetragonal with a = 7.454 (1), c = 12.885 (2) Å, V = 716.0 Å 3 , space group P 4 3 2 1 2, Z = 4 and D x 2.774 g cm −3 . The structure (single-crystal X-ray, R = 0.025, wR = 0.023) comprises spiral (43) single chains of corner-shared Mg(2) octahedra cross-linked…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTAnalysis of Synthetic Polymers and RubbersP. B. Smith, A. J. Pasztor, M. L. McKelvy, D. M. Meunier, S. W. Froelicher, and F. C.-Y. WangView Author Information Analytical Sciences Laboratory, Dow Chemical U.S.A., 1897 Building, Midland, Michigan 48667 Cite this: Anal. Chem. 19…
The molecular weight distribution and the long-chain branching distribution of low-density polyethylene are predicted as a function of the synthesis conditions from a kinetic model for an autoclave reactor. The model includes initiations, propagation, termination by combination and disproportionation, and chain transf…
Iron, copper, and nickel electrodes were examined as possible metal/metal(II) chloride cathodes for the room temperature sodium/metal chloride battery in a molten salt composed of sodium chloride (NaCl), aluminum chloride , and 1‐methyl‐3‐ethylimidazolium chloride (MEIC). The iron electrode was investigated in basic,…