Materials Literature
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The preparation and solid state characterization of the bifunctional radical furan-2,5-bis(1,2,3,5-dithiadiazolyl) 2,5-[(S 2 N 2 C)OC 4 H 2 (CN 2 S 2 )] and the related monofunctional radical 2-cyanofuran-5-(1,2,3,5-dithiadiazolyl) 2,5-[(S 2 N 2 C)OC 4 H 2 (CN)] are described. The crystal structure of 2,5-[(S 2 N 2 C)…
Abstract A novel process for the preparation of highly saturated nitrile rubber latex has been developed. This process directly converts NBR latex into HNBR latex in one reaction step. The key to the process is the efficient in-situ generation of diimide within the latex by the oxidation of hydrazine hydrate in the pr…
For pt.X see ibid., vol.8, no.1, p.16 (1992). The correlation of partial discharge (PD) measurements with insulation degradation and failure is addressed. The limitations inherent to such diagnostics as applied to solid insulating systems are examined. The discussion is based on simple experimental facts and the physi…
A Fortran 77 Monte Carlo source code built from the EGS4 Monte Carlo code system has been used for timing benchmark purposes on 29 different computers. This code simulates the deposition of energy from an incident electron beam in a 3-D rectilinear geometry such as one would employ to model electron and photon transpo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical characterization of ordering and disordering of block copolymer microstructureKarl Amundson, Eugene Helfand, Sanjay S. Patel, Xina Quan, and Steven D. SmithCite this: Macromolecules 1992, 25, 7, 1935–1940Publication Date (Print):March 1, 1992Publication History Publi…
In polycrystalline materials, the microscopic strain field is always highly heterogeneous during inelastic deformation, even when the macroscopic strain field is uniform. This is particularly true near potential damage and failure nucleation sites, such as voids and inclusions. Also, in the context of high-strain-rate…
High-resolution, fast optical hole-burning results are reported for the amorphous system cresyl violet in ethanol glass at 1.3 K. Holes are burned and detected using a novel technique which allows precise detection of narrow (∼0.03 cm−1 ), shallow (∼1%) holes 10 μs to 50 ms after their generation. The technique is des…
The charge distribution in negatively corona-charged Teflon FEP (fluoroethylenepropylene) films was investigated with the laser-induced pressure-pulse method. The 12.7- and 25.4-μm samples were charged to potentials up to −2500 and −4500 V, respectively, and thereafter stored at room temperature. Measurements of the c…
Abstract High-resolution electron microscopy and microanalytical studies were performed on clay and bulk soil samples developed on various igneous and metamorphic rocks from Galicia in the Coruna province in NW Spain. Two mineralogical microsystems can be distinguished showing different stages of weathering. For felds…
The electronic properties of passive films on Fe-Cr alloys were determined by the photoelectrochemical technique. Measurement of the flat band potential for the passive films on the different alloys indicated that the film is doped increasingly n-type as the Cr concentration in the base alloy is increased. This doping…
The mechanism of oxidation resistance in SiC‐coated carbon‐carbon composites containing boron‐based inhibitors has been investigated using thermodynamic calculations, thermogravimetric analysis, and electron microscopy. A model is developed based on the formation of a volatile B 2 O 2 sub‐oxide in the interior of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectra of matrix-isolated tolan: site selective one- and two-photon spectraMichael Gutmann, Murthy Gudipati, Paul Friedrich Schoenzart, and Georg HohlneicherCite this: J. Phys. Chem. 1992, 96, 6, 2433–2442Publication Date (Print):March 1, 1992Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structures of heterocyclic ladder polymers; polyphenothiazine, polyphenoxazine, and polyphenoquinoxalineSung Y. Hong, Miklos Kertesz, Yong S. Lee, and Oh Kil KimCite this: Chem. Mater. 1992, 4, 2, 378–383Publication Date (Print):March 1, 1992Publication History Pu…
This review summarizes the attempts of drug targeting in the field of magnetic resonance imaging. Although the field is young and most work is performed in nonspecific lanthanide chelates, it is obvious that target selectivity and receptor and/or antigen specificity is the most important issue if functional magnetic r…
A method is presented to deal with the propagation of X-rays or neutrons in a statistically distorted crystal in the general case where both short-range and long-range order are present: it is the generalization of a theory presented in a previous paper [Becker & Al Haddad (1990). Acta Cryst. A46, 123–129]. The main d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental study and kinetic modeling of higher hydrocarbon oxidation in a jet-stirred flow reactorCorinne Bales-Gueret, Michel Cathonnet, Jean Claude Boettner, and Francoise GaillardCite this: Energy Fuels 1992, 6, 2, 189–194Publication Date (Print):March 1, 1992Publicati…
In some binary mixtures of smectogenic and non-mesomorphic aliphatic compounds, the smectic A phase separates in the form of cylindrical structures. Our observations on some of these systems indicate that such structures are stabilised by a negative radial concentration gradient of the non-mesomorphic component. If th…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePhotochemical formation of oxochromium(IV) tetraphenylporphyrin from nitritochromium(III) tetraphenylporphyrin in benzeneMinoru Yamaji, Yoshimasa Hama, Yoshio Miyazaki, and Mikio HoshinoCite this: Inorg. Chem. 1992, 31, 5, 932–934Publication Date (Print):March 1, 1992Publication…
The successful growth of ZnS using elemental sources of Zn and S is reported. This wide band gap semiconductor is difficult to grow by molecular-beam epitaxy (MBE) using elemental sources because of the very high vapor pressure of S. As a consequence, a new type of effusion cell, designed for very low temperature oper…
A survey of the literature and experts in the field was performed on slow strain rate (SSR) testing methods for the Materials Technology Institute of the Chemical Process Industries, Inc. The goal of the survey was to determine if SSR testing methods yield useful data in predicting stress corrosion cracking susceptibi…