Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective Nucleation and Growth of an Organic Polymorph by Ledge-Directed Epitaxy on a Molecular Crystal SubstrateSalvatore J. Bonafede and Michael D. WardCite this: J. Am. Chem. Soc. 1995, 117, 30, 7853–7861Publication Date (Print):August 1, 1995Publication History Publishe…
A test method for probing oxidation embrittlement in ceramic‐matrix composites has been devised and demonstrated for three composites: SiC/magnesium aluminosilite, SiC/SiC, and SiC/Al 2 O 3 . The method identifies a “pest” temperature T p . The growth of an embrittled region from the surface, at T P , has been illustr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of .epsilon.-Caprolactone Initiated by Aluminum Isopropoxide Trimer and/or TetramerAndrzej Duda and Stanislaw PenczekCite this: Macromolecules 1995, 28, 18, 5981–5992Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published…
Active reaction sites for reduction in electrode have been characterized by addressing the origin of the cathodic polarization effects on this electrode material. Cathodic polarization (up to −1.2 V vs. Pt reference electrode) had several effects on reduction kinetics. First, the reduction rate was favorably increased…
The substrate specificities of extracellular lipases purified from Bacillus subtilis, Pseudomonas aeruginosa, Pseudomonas alcaligenes, Pseudomonas fluorescens, and Burkholderia cepacia (former Pseudomonas cepacia) and of extracellular polyhydroxyalkanoate (PHA) depolymerases purified from Comamonas sp., Pseudomonas le…
The Mg 2+ insertion into layered vanadium bronzes, , has been studied with regard to their use as positive electrodes of magnesium ion transfer batteries. In acetonitrile‐based electrolytes maximum specific charges of ∼200 Ah/kg were measured but the charge decreases rapidly with the increasing cycle number. A salt me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical and optical properties of porous nanocrystalline TiO2 filmsFei Cao, Gerko Oskam, Peter C. Searson, Jeremy M. Stipkala, Todd A. Heimer, Fereshteh Farzad, and Gerald J. MeyerCite this: J. Phys. Chem. 1995, 99, 31, 11974–11980Publication Date (Print):August 1, 1995Pu…
A new transparent conducting Zn 2 In 2 O 5 film is demonstrated. The film was prepared by rf magnetron sputtering using binary compound targets composed of In 2 O 3 and ZnO (with a Zn content (Zn/(Zn+In)) of 5-45 at%). The electrical properties were relatively independent of the substrate temperatures between room tem…
${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4.125}$ exhibits a cooperative ordering of dopant-induced holes and Ni spins below a transition temperature of 110 K. There is also an ordering of interstitial oxygens that occurs near room temperature. We present a comprehensive analysis of experimentally observed superlattice inte…
Interfacial defect theory is applied to the epitaxial ferroelectric system consisting of a tetragonal ferroelectric such as BaTiO3 or PbTiO3 grown onto a cubic (001) substrate. The interfacial defects that result from the diffusionless paraelectric to ferroelectric (PE→FE) phase transition are treated under the constr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate Constants for Charge Injection from Excited Sensitizer into SnO2, ZnO, and TiO2 Semiconductor NanocrystallitesRichard W. Fessenden and Prashant V. KamatCite this: J. Phys. Chem. 1995, 99, 34, 12902–12906Publication Date (Print):August 1, 1995Publication History Publishe…
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…