Materials Literature
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A study of the stresses in a ferroelectric capacitor stack deposited on an oxidized silicon substrate is presented. The capacitor stack was prepared with sputtered Pt bottom and top electrodes and a ferroelectric film of composition PbZrxTi1−xO3 (PZT) with x≊0.5 which was deposited using a modified sol-gel technique.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzo Polymers for Reversible Optical Storage. 5. Orientation and Dipolar Interactions of Azobenzene Side Groups in Copolymers and Blends Containing Methyl Methacrylate Structural UnitsD. Brown, A. Natansohn, and P. RochonCite this: Macromolecules 1995, 28, 18, 6116–6123Public…
Liver cell transplantation may provide a means to replace lost or deficient liver tissue, but devices capable of delivering hepatocytes to a desirable anatomic location and guiding the development of a new tissue from these cells and the host tissue are needed. We have investigated whether sponges fabricated from poly…
Abstract Historically, the decarbonation of Mg-Al-CO 3 hydrotalcite-like compounds (HTlc) has been thought to occur between 400° and 500°C. The present work demonstrates that when HTlcs having the maximum Al content, Al/(Al + Mg) = 0.33, are heated to 500°C, 20–30% of the carbonates remain. The evolution of the remain…
PURPOSE: To quantify the rate of adverse reactions to gadopentetate dimeglumine. MATERIALS AND METHODS: Magnetic resonance (MR) imaging was performed in 15,496 patients in April-September 1992. Data were collected before and after intravenous administration of 0.1 mmol/kg gadopentetate dimeglumine. RESULTS: Adverse re…
Polyesters are currently synthesized by a step-growth mechanism from a mixture of a diol and a diacid (or a diacid derivative), or from a hydroxy-acid when available. Ring-opening polymerization (ROP) of lactones and related compounds is an alternative method for the synthesis of aliphatic polyesters. Comparison of th…
Abstract The direct condensation polymerization of lactic acid has been studied, and polylactic acid having a high molecular weight was obtained in an organic solvent without any isolation of the intermediate, dilactide. The molecular weight was raised up to 300000 through the examination of several reaction condition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Ultrafine Carbon Tubes by Using an Anodic Aluminum Oxide Film as a TemplateTakashi Kyotani, Li-fu Tsai, and Akira TomitaCite this: Chem. Mater. 1995, 7, 8, 1427–1428Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published in…
Abstract The bisphenolic dithienylethene molecules 1a and 1b were synthesized in overall yields of 45% from 4‐bromoanisole and 44% from 2.6‐di‐ tert ‐butyl‐4‐iodophenol, respectively. The corresponding extended quinones 3a and 3b were also prepared. Photochemical studies showed that compounds 1 are photochromic; the o…
Tin‐modified lead zirconate titanate ceramics, Pb (0.99) Nb 0.02 ‐[(Zr 0.55 Sn 0.45 ) 0.98 Ti y ]O 3 (PZST 45/ y /2), have been studied by hot‐stage transmission electron microscopy (TEM), dielectric spectroscopy, Sawyer‐Tower polarization ( P—E ) measurements, and electrically induced strain (ε‐ E ) techniques. The c…
Polyethyleneterephthalate (PET) is a versatile engineering plastic with excellent thermal and chemical resistance and mechanical performance. It is extensively used as fibers for apparel, films for packaging, in bottles for beverages, and also in engineering components. Because of the high melting point (ca. 255°C) an…
The expression for the mutual interaction force between two pulsating gas bubbles immersed in an incompressible and inviscid fluid is derived assuming that the distance between the bubbles is comparable to their sizes. The results of numerical calculations for air bubbles in water are presented. They show that at smal…
Abstract This paper deals with the conductivity of binary polymer composites filled with an electronically conductive material. A “dynamic cluster model” is offered to describe the conductivity of such polymer composites in the highly filled region, i.e. above the percolation threshold. The model is based on the follo…
An ‘in situ’ deposition method is presented where combination of solutions of aniline monomer and an oxidizing agent leads to the growth of uniform polyaniline (PAn) conducting thin films on submerged substrates. The PAn films can be deposited on a variety of substrates including glass and organic materials. Film thic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEarly-Time Dynamics and Reactivity of Polyoxometalate Excited States. Identification of a Short-Lived LMCT Excited State and a Reactive Long-Lived Charge-Transfer Intermediate following Picosecond Flash Excitation of [W10O32]4- in AcetonitrileDean C. Duncan, Thomas L. Netzel…
The Anderson model of local-state conduction electron mixing is applied to the p roblem of interlayer magnetic coupling in metallic multilayered structures with palladium (Pd) spacer layers. An oscillation period of $5$ spacer monolayers and the tendency towards ferromag netic bias of the interlayer magnetic coupling…
Other| August 01, 1995 Geochemical alteration of pyrochlore group minerals: Pyrochlore subgroup Gregory R. Lumpkin; Gregory R. Lumpkin Australian Nuclear Science and Technology Organization, Advanced Materials Program, Menai, NSW, Australia Search for other works by this author on: GSW Google Scholar Rodney C. Ewing R…
Mechanical properties of titanium-zirconium binary alloys were investigated in order to reveal their possible use for new biomedical materials and to collect useful data for alloy design through a hardness test, a tensile test, and optical microscopy. The hardness of the alloy containing 50% zirconium was approximatel…
We report a low-temperature loss anomaly in several oxidic perovskites such as ${\mathrm{KTaO}}_{3}$, ${\mathrm{KTaO}}_{3}$:Nb, ${\mathrm{SrTiO}}_{3}$, ${\mathrm{SrTiO}}_{3}$:Ca, ${\mathrm{PbTiO}}_{3}$:La, Cu, and ${\mathrm{BaTiO}}_{3}$:La. We show that this anomaly arises from a low-frequency dielectric relaxation. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent Polyaminocarboxylate Chelates of Terbium and Europium: The Effect of Chelate StructureMin Li and Paul R. SelvinCite this: J. Am. Chem. Soc. 1995, 117, 31, 8132–8138Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inis…