Materials Literature
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Abstract The effect of variation of structural factors on the spin-exchange interaction between copper(II) centers in dialkoxo-bridged dinuclear copper complexes were studied by the ab initio MO method with UHF formalism. The calculations were performed on di-μ-methoxotetraamminedicopper(II). The J-values were obtaine…
NiO films have been grown on high‐purity Ni and Ni 0.1 weight percent (w/o) Cr alloy, at 700°C and 0.21 bar, by sequential oxidation in 16 O 2 and 18 O 2 . The distributions of oxygen, Ni, and Cr isotopes in the films were analyzed using SIMS. For both materials, the rate controlling transport process was found to be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelation between geometry and charge transfer in low-dimensional organic saltsTimothy C. Umland, Sharon Allie, Tom Kuhlmann, and Philip CoppensCite this: J. Phys. Chem. 1988, 92, 22, 6456–6460Publication Date (Print):November 1, 1988Publication History Published online1 May…
In this paper, we derive a general expression for the excitation probability corresponding to the collection of inelastically scattered electrons in a scanning transmission electronic microscopy configuration. We prove that, if all inelastically scattered electrons are collected, then the fraction of electrons that wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing-opening polymerization of 3(S)-[(benzyloxycarbonyl)methyl]-1,4-dioxane-2,5-dione: a new route to a poly(.alpha.-hydroxy acid) with pendant carboxyl groupsYohiharu Kimura, Kenji Shirotani, Hideki Yamane, and Toshio KitaoCite this: Macromolecules 1988, 21, 11, 3338–3340Pu…
This paper is a review of dielectric aging and a discussion of the possible mechanisms that may be responsible for the time dependent decrease in complex dielectric constant. The discussion is divided into three material systems: barium titanate, PZT and relaxors. Aging is considered as it affects the real portion of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAustraline, a Novel Pyrrolizidine Alkaloid Glucosidase Inhibitor from Castanospermum australeRussell J. Molyneux, Mabry Benson, Rosalind Y. Wong, Joseph E. Tropea, and Alan D. ElbeinCite this: J. Nat. Prod. 1988, 51, 6, 1198–1206Publication Date (Print):November 1, 1988Publi…
The multislice method, pioneered by Cowley and Moodie, has recently been adapted to simulate annular dark-field scanning transmission electron-microscope (ADF STEM) images. This paper presents a series of calculations using this new approach with experimental parameters appropriate for a VG-HB501 STEM to investigate t…
A rapid analytical technique has been developed for obtaining the reduced density function, G(r), from polycrystalline and amorphous thin films, using post-specimen scanning and an energy loss spectrometer on a transmission electron microscope. The technique gives on-line analysis of nearest-neighbour distances to an…
The electro-optical dynamics, hysteresis effects, and microscopic structure of polymer-dispersed films of nematic liquid crystal are probed in order to gain insight into the operation of this new class of liquid crystal light valves. In tracking the rise and decay response times of these devices, it appears that there…
Poly(ether ester) block copolymers based on polyethylene oxide (PEO) and polylactic acid (PLA) segments were synthesized and characterized, with the aim of developing a new family of bioadsorbable polymers. The materials developed were tailored to meet various mechanical and degradation requirements, and overcome the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-oxygen multiple bond lengths: a statistical studyJames M. MayerCite this: Inorg. Chem. 1988, 27, 22, 3899–3903Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988https://pubs.acs.org/doi/10.1021/ic0029…
Abstract The morphology of compatibilized polyolef in/polyamide blends was found to be significantly dependent on the concentration of an ionomer compatibilizer (polyethylene‐methacrylic acid‐isobutyl acrylate terpolymer) in the blend. For a dispersed phase content of 10% by weight, a maximum reduction in phase size w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrodeposition of platinum microparticles into polyaniline films with electrocatalytic applicationsKent M. Kost, Duane E. Bartak, Beth. Kazee, and Theodore. KuwanaCite this: Anal. Chem. 1988, 60, 21, 2379–2384Publication Date (Print):November 1, 1988Publication History Pu…
A systematic study of the dependence of the band gap, the linear optical susceptibility, the polarizability α, and the second hyperpolarizability γ, on the number of repeat unit is conducted for the thiophene series from monomer to hexamer. The linear optical susceptibilities for oligomers have been determined from th…
Abstract The rapid growth in the use of multiphase polymer systems (blends and composites) is undoubtedly related to the availability of methods of controlling the physical and chemical interactions at the interface. Compounds acting as interfacial agents are commonly known as “compatibilizers” in blends, or “coupling…
Numerical simulations of mercury injection using three-dimensional resistor networks demonstrate that the electrical resistance decreases in stepwise fashion with increasing occupation probability near the resistance percolation threshold. The power-law nature of the resistance-step distribution and the value of the e…
A remarkable absorption spectral change has been observed in ethylene propylene elastomer (EPR) films containing elongated poly(3-alkylthiophene). This change is explained in terms of the formation of new torsioned bonds between thiophene rings on the main polymer chains. This interpretation is also consistent with th…
Thiolase (acetyl-coenzyme A [CoA] acetyltransferase, E.C. 2.3.1.19) from Clostridium acetobutylicum ATCC 824 has been purified 70-fold to homogeneity. Unlike the thiolase in Clostridium pasteurianum, this thiolase has high relative activity throughout the physiological range of internal pH of 5.5 to 7.0, indicating th…
We present a new scattering matrix formalism for the modeling of electromagnetic wave propagation in stratified media. It is computationally efficient and stable and is well suited to the layer geometry that is characteristic of stratified materials. It is applied successfully to the modeling of total attenuated refle…