Materials Literature
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The decomposition of a duplex stainless steel during aging at 600°C has been investigated using analytical transmission electron microscopy with the intention of elucidating the nucleation sites of the new phases arising from ferrite decomposition. The first transformation product to be formed is M23C6. This carbide,…
Three-dimensional electron diffraction intensity data from form (III) of isotactic poly(1-butene) have been collected by tilting solution- and epitaxially grown thin microcrystals. The orthorhombic space group is P2 1 2 1 2 1 with cell constants a= 12.38, b= 8.88 and c= 7.56 A, the latter being the chain repeat. The c…
We study adsorption-desorption kinetics of polymer chains at a solid surface. Protiopolystyrene, adsorbed from dilute cyclohexane to a single solid surface of oxidized silicon, was displaced by deuteriopolystyrene. A single time constant, tau(off), described displacement for a significant time (1-3 h), followed by a p…
Protic acid doping of organic materials can be used to form conductive materials, see Figure. In an attempt to identify the mechanism of charge transfer in materials formed in this way, this first evidence is presented for the occurrence of radicals in the TTF + TTFH⊕ system (TTF us tetrathiafulvalene). magnified image
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Purification of .beta.-Amyloid (1-43) via Soluble, Amide Backbone Protected IntermediatesM. Quibell, W. G. Turnell, and T. JohnsonCite this: J. Org. Chem. 1994, 59, 7, 1745–1750Publication Date (Print):April 1, 1994Publication History Published online1 May 20…
The electrochemistry of Ti(II) in and the electrodeposition of metastable aluminum‐titanium alloys containing up to 28 atom percent Ti are reported. Ti(II)/Ti(III) was studied by chronoamperometry, chronopotentiometry, cyclic voltammetry, and convolution voltammetry during the electrochemical dissolution of titanium.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Approach to Decomposition of Nitric Oxide Using Sorbent/Catalyst without Reducing Gas: Use of Heteropoly CompoundsRalph T. Yang and Ning ChenCite this: Ind. Eng. Chem. Res. 1994, 33, 4, 825–831Publication Date (Print):April 1, 1994Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyanilines Doped with Phosphonic Acids: Their Preparation and CharacterizationH. S. O. Chan, S. C. Ng, and P. K. H. HoCite this: Macromolecules 1994, 27, 8, 2159–2164Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 Apr…
In a previous paper, we reported identification of the 5' part of hprA of Methylobacterium extorquens AM1, which encodes the serine cycle enzyme hydroxypyruvate reductase (L. V. Chistoserdova and M. E. Lidstrom, J. Bacteriol. 174:71-77, 1992). Here we present the complete sequence of hprA and partial sequence of genes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Conjugated Polymers: Preparation, Spectroscopic, and Charge-Transport Properties of a New Soluble Polythiophene Derivative: Poly(3',4'-dibutyl-2,2':5',2''-terthiophene)Chenggang Wang, Michael E. Benz, Eugene LeGoff, Jon L. Schindler, Joyce Allbritton-Thomas, Carl…
The in situ breaking stresses of pulled‐out fibers on the fracture surface of a fiber‐reinforced composite can be determined ex post facto from a measurement of the fracture mirrors on the surfaces of the fibers. Here, the relationship between the resultant distribution of breaking stresses and the true in situ fiber…
A very smooth amorphous molybdenum oxide thin film can be fabricated easily by a spin‐coating technique using a solution of peroxo‐polymolybdic acid, which is formed by the direct reaction of metallic molybdenum with hydrogen peroxide. Amorphous resulting from heating such a film at 80–150°C exhibited reversible elect…
Interest in molecular magnets has so far mainly been confined to scientific aspects, but their potential technological applications are wide ranging. Here their use in lightweight transformers and generators, magnetic shielding, and magnetic and magneto‐optic recording media are discussed. The Figure shows a powder sa…
The role of steric crowding of peripheral substituents in causing nonplanar distortions of the porphyrin macrocycle has been investigated in a series of nickel(II) meso-nitrooctaethylporphyrins as models for protein-induced nonplanar distortions of metal-tetrapyrrole cofactors. UV-visible absorption spectra, resonance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRoles of Surface Oxygen Groups on Poly(acrylonitrile)-Based Active Carbon Fibers in SO2 AdsorptionSeiki Kisamori, Isao Mochida, and Hiroshi FujitsuCite this: Langmuir 1994, 10, 4, 1241–1245Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Pu…
Preclinical experiments with liposome-encapsulated anthracyclines indicate that this form of delivery may be effective in decreasing the cardiotoxic effect of these drugs. The tumor drug levels and the antitumor efficacy of anthracyclines in a number of mouse models are significantly enhanced by delivery in long-circu…
Bananas, Musa (AAA group, Cavendish subgroup) ‘Giant Cavendish’, were ripened in a biotron at 25°C with ethylene during 4 days. Changes in mechanical properties of pulp were detected by a stress‐relaxation technique. The decrease in T 0 , the parameter for minimum stress‐relaxation time, began between day 0.5 and 1, w…
Abstract Diffuse reflectance spectra of kaolins have been recorded in samples from different environments. They show the systematic presence of Fe-oxides, even in bleached kaolins, with no contribution from the Fe 3+ ions substituted in kaolinite. Second derivative spectra of various Fe-phases (hematite, goethite, lep…
Effects of strong electron correlation on the electron-lattice interaction are studied by means of the exact diagonalization method for a finite-size cluster system. A simple two-component tight-binding Hamiltonian with the intrasite and intersite Coulomb repulsions is adopted. Upon changing the correlation energy (U)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Morphology and Phase Identifications in Poly(aryl ether ketone)s and Their Copolymers. 1. Polymorphism in PEKKRong-Ming Ho, Stephen Z. D. Cheng, Benjamin S. Hsiao, and Kenncorwin H. GardnerCite this: Macromolecules 1994, 27, 8, 2136–2140Publication Date (Print):April…