Materials Literature
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Sol-gel derived ferroelectric thin films of lead zirconate titanate have been annealed through the rapid thermal annealing (RTA) technique to investigate the effect of various annealing temperature-time combinations. Crystallization of the film into the perovskite phase required 10 s at 600 °C and a mere 1 s at 700 °C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of incompletely-condensed silsesquioxanes with pentamethylantimony: a new synthesis of metallasilsesquioxanes with important implications for the chemistry of silica surfacesFrank J. Feher, Theodore A. Budzichowski, Kamyar Rahimian, and Joseph W. ZillerCite this: J…
Abstract The oxidized states of double‐stranded, planar (1,4‐phenylene)‐type ladder polymers are characterized by means of UV/VIS/NIR NIR: Near infrared. spectroscopy and cyclic voltammetry. The oxidation with antimony pentachloride or iron trichloride proceeds as a two‐step process; first, radical cationic (polaronic…
The effect of intergrain exchange and magnetostatic interactions on remanence and coercivity is calculated numerically for an isotropic Nd-Fe-B model magnet composed of 8000 grains. The intergrain exchange interaction affects the magnetizing process markedly when the grain size L is small, but the magnetostatic intera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOlefin epoxidation and alkane hydroxylation catalyzed by robust sulfonated manganese and iron porphyrins supported on cationic ion-exchange resinsSandro Campestrini and Bernard MeunierCite this: Inorg. Chem. 1992, 31, 11, 1999–2006Publication Date (Print):May 1, 1992Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly of dinuclear helical and non-helical complexes with copper(I)Stephane Ruettimann, Claude Piguet, Gerald Bernardinelli, Bernard Bocquet, and Alan F. WilliamsCite this: J. Am. Chem. Soc. 1992, 114, 11, 4230–4237Publication Date (Print):May 1, 1992Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral micellar porphyrin fibers with 2-aminoglycosamide head groupsJuergen Hinrich Fuhrhop, Corinna Demoulin, Christoph Boettcher, Juergen Koening, and Ulrich SiggelCite this: J. Am. Chem. Soc. 1992, 114, 11, 4159–4165Publication Date (Print):May 1, 1992Publication History…
Abstract New aromatic polyimides containing triphenylamine unit were prepared by two different methods, i.e., a conventional two‐step method starting from 4,4′‐diaminotriphenylamine and aromatic tetracarboxylic dianhydrides and the one‐step thioanhydride method starting from the aromatic diamine and aromatic tetracarb…
Article On Ferromagnetic Ordering and Lattice Diffusion - A Simple Model / Uber ferromagnetische Ordnung und Gitterdiffusion Ein einfaches Modell was published on May 1, 1992 in the journal International Journal of Materials Research (volume 83, issue 5).
A thermochemical etching procedure, comprising a short chemical etch followed by a low‐temperature thermal anneal (typically 10 min at ≲70% of the sintering temperature), has proved successful for the preparation of alumina, aluminum nitride, and nickel zinc ferrite ceramics for micro‐structural studies. Good‐quality…
Abstract Chemical recycling of a polyurethane elastomer and a flexible foam based on methylenebis(phenyl isocyanate) (MDI) and a polyetherpolyol was performed by ammonolytic cleavage of urethane and urea bonds under supercritical conditions. Resulting products were the polyols, the amines corresponding to the isocyana…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper coordination chemistry of novel octadentate, tetranucleating, bis(diazine) ligands. Structural and magnetic properties of tetranuclear complexes involving a rectangular array of copper(II) centersSantokh S. Tandon, Sanat K. Mandal, Laurence K. Thompson, and Rosemary C…
The use of empirical and deterministic models for predicting damage functions for localized corrosion are reviewed and compared. In general, empirical models are successful because the distribution functions employed display great mathematical flexibility. However, they require a very significant database to achieve r…
Abstract Silica, alumina, silica‐aluminas and zeolites were screened as catalysts for polyolefins degradation. The degradations were carried out at temperatures from 200°C till to 600°C under vacuum. The degradation products were analyzed using gas chromatography‐mass spectrometry (GC‐MS). The comparison between these…
A new class of structurally complex materials whose constituent molecules are composed of three rod-like units, each attached to a central disc-like unit via a flexible spacer have been synthesized and their phase behaviour investigated. They are found to exhibit a rich and unusual liquid-crystalline polymorphism.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the alternating copolymerization of vinyl ethers with chlorotrifluoroethyleneB. Boutevin, F. Cersosimo, and B. YoussefCite this: Macromolecules 1992, 25, 11, 2842–2846Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published iniss…
Microstructure, phase stability, and mechanical properties of CeO 2 ‐partially‐stabilized zirconia (12 mol% Ce‐TZP) containing 10 wt% Al 2 O 3 and 1.5 wt% MnO were studied in relation to the base Ce‐TZP and the Ce‐TZP/Al 2 O 3 composite without MnO. The MnO reacted with both CeO 2 and Al 2 O 3 to form a new phase of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of segmental interaction by small-angle x-ray scattering based on the random-phase approximation for asymmetric, polydisperse triblock copolymersShinichi Sakurai, Keiji Mori, Atsuo Okawara, Kohtaro Kimishima, and Takeji HashimotoCite this: Macromolecules 1992, 25,…
Two test specimens of skin were cut from the lateral aspect of each hind limb of 9 rats. Specimens were contiguous, thereby providing matched pairs. One specimen was immediately placed in liquid nitrogen for 5 minutes, then stored at -70 C and tested within 3 to 4 weeks. Within 5 minutes of harvest, the second specime…
Summary Two test specimens of skin were cut from the lateral aspect of each hind limb of 9 rats. Specimens were contiguous, thereby providing matched pairs. One specimen was immediately placed in liquid nitrogen for 5 minutes, then stored at −70 C and tested within 3 to 4 weeks. Within 5 minutes of harvest, the second…