Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of ring-opening reactions of epoxide with aluminum and zinc porphyrins. Relation to the mechanism of ring-opening polymerizationYoshihiko Watanabe, Tomokazu Yasuda, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1992, 25, 5, 1396–1400Publication Date…
Abstract The new mineral tooeleite occurs with pyrite, arsenopyrite, scorodite, and jarosite at the U.S. Mine, Tooele Country, Utah. Analysis by electron microprobe gave Fe 2 O 3 43.56%, As 2 O 5 38.61%, SO 3 7.24%, and H 2 O by the Penfield method 9.80%. For this analysis, the suggested formula is Fe 8-2 x 3+ [(AS 1-…
The author considers the computation of the electromagnetic axial forces on the windings of a step-up-generator transformer under unbalanced MMFs of the same phase by means of a finite element code. The unbalance between the MMFs of the same phase, which might be on the order of the nominal MMF, is caused by the high…
The improved T- Omega method is employed to calculate the three-dimensional transient eddy current field in large transformers, as well as the short-circuit electromagnetic forces acting on the transformer windings. The effects of the magnetic shielding and initial angles of currents are studied, and the nonuniform di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopic studies of intercalated molybdate ions in layered metal hydroxidesJen Twu and Prabir K. DuttaCite this: Chem. Mater. 1992, 4, 2, 398–401Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https…
Abstract Photochromic behaviors of hemithioindigo (HT) derivatives in bilayer membrane matrices and related aqueous system are investigated. HT derivatives were incorporated into bilayer membrane matrices at a molar ratio to bilayer amphiphiles of 0.01. Under these conditions, HT amphiphiles having an ammonio group di…
A prototype hydride storage bed was fitted with strain gages to measure strains occurring in the stainless steel bed vessel caused by expansion of the storage powder upon uptake of hydrogen. The strain remained low in the bed as hydrogen was added, up to a bed loading of about 0.5 hydrogen to metal atom ratio. The str…
A comparison study of doxorubicin loading, release characteristics and stability within sodium and hydrogen forms of ion-exchange resin microspheres has been performed. It was demonstrated that resins in the Na+ form, although having lower drug loading capacity, showed similar release profiles to resins in the H+ form…
Abstract In recent years, grazing incidence angle attachments have been shown to be very useful in the phase identification of thin polycrystalline films. These devices are sold commercially as attachments to standard powder diffractometers. The attachment normally consists of a long soller slit assembly and a flat cr…
We develop a theoretical description of nuclear spin relaxation mediated by MRI contrast agents and transport processes in liposome systems. Such systems compartmentalize the physical space such that paramagnetic contrast agents, which enhance relaxation, are trapped in some subvolume. Due to diffusive transport acros…
The authors describe computational analyses and an experiment on thin plate deflection in a magnetic field. The authors show the governing equation for the eddy current and the deflection analyses of a thin plate, considering the coupling effect between the eddy current and the deflection under nonuniform magnetic fie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR studies of a dinickel complex in its (II,II) and (II,III) oxidation statesTheodore R. Holman, Michael P. Hendrich, and Lawrence Que Jr.Cite this: Inorg. Chem. 1992, 31, 6, 937–939Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Publishe…
The pyrolysis of organoelemental polymerss provides a powerful route to high‐ppurity, high‐performance ceramics. The various factors influencing the production of low‐oxygen‐content ceramic fibers from polymeric silazanes are examined and the possibility of controlling the composition of the fibers by varying the pyro…
The optical properties of a thin metal film are derived, with a thin film defined as having a thickness smaller than the wavelength of the radiation and the skin depth. The derivation is based on the continuity equation for the electric field and on the energy balance for the incident, reflected, transmitted, and abso…
Abstract Thirteen hemithioindigo (HT) derivatives bearing alkyl chains are newly synthesized and their photochromism and emission properties are investigated. The Z/E photoisomerisms of these compounds in organic solvents are essentially in agreement with data reported by Mostoslavskii and Izmail’skii (J. Gen. Chem. U…
Abstract Reactions of dihalogenoquinones or dihalogenoquinoxalines with thioamides gave the corresponding 1,4‐dithiines in high yields. Many of polycyclic 1,4‐dithiin derivatives can be synthesized by the reactions of dihalogenoheterocycles with thioamides, and they are useful as pigments and functional materials for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRietveld analysis of sodium tungstate hydrate NaxWO3+x/2.cntdot.yH2O, which has the hexagonal tungsten bronze structureKenneth P. Reis, E. Prince, and M. Stanley WhittinghamCite this: Chem. Mater. 1992, 4, 2, 307–312Publication Date (Print):March 1, 1992Publication History P…
Cohesive elasticity is the grade-3 theory of elasticity developed by Mindlin in 1965. It has a modulus of cohesion that gives rise to surface-tension. The concept of adhesion is introduced, and interfacial energies and energy of adhesion are defined. The interfacial energy solution may also be used to define a grain b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModulation of chain conformation of spiropyran-containing poly(L-lysine) by combined action of visible light and solventOsvaldo Pieroni, Adriano Fissi, Alessandro Viegi, Daniele Fabbri, and Francesco CiardelliCite this: J. Am. Chem. Soc. 1992, 114, 7, 2734–2736Publication Da…
We have developed a combined calorimetric/electron microscopic technique for determining several fundamental properties of polymer-dispersed liquid crystal (PDLC) films. Calorimetry allows us to determine the solubility limit of liquid crystal in the polymer matrix as well as the fraction of liquid crystal which is di…