Materials Literature
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Abstract An automatic cross‐fractionation system is presented by combining a newly developed crystallizability fractionation device based on the principle of isothermal dissolution with a commercially available GPC. The detail design, procedure, and operation variables are described. The fractions eluted from the devi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning electron microscopic and x-ray photoelectron spectroscopic examination of Tokai glassy carbon surfaces subjected to radio frequency plasmasCharles W. Miller, Dale H. Karweik, and Theodore. KuwanaCite this: Anal. Chem. 1981, 53, 14, 2319–2323Publication Date (Print):…
Si 3 N 4 compacts, containing ≅7 wt% of both BeSiN 2 and SiO 2 as densification aids, can be reproducibly sintered to relative densities >99% by a gas‐pressure sintering process. Nearly all densification takes place via liquid‐phase sintering of transformed β‐Si 3 N 4 grains at T =1800° to 2000°C. Compacts with hig…
Article The crystal structure of Benzoic Acid: a redetermination with X-rays at room temperature; a summary of neutron-diffraction work at temperatures down to 5 K was published on December 1, 1981 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 157, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures of titanacyclobutanesJ. Bosco Lee, Gregory J. Gajda, William P. Schaefer, Thomas R. Howard, Takao Ikariya, Daniel A. Straus, and Robert H. GrubbsCite this: J. Am. Chem. Soc. 1981, 103, 24, 7358–7361Publication Date (Print):December 1, 1981Publication History Publi…
Abstract A method for estimating Gibbs free energies and stabilities of clay minerals is proposed for use with computer programs aimed at calculating the chemical evolution of natural water-rock systems. This is based on (i) a model for ideal solid solutions of a large number of end-member compositions and (ii) a data…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered magnetic bimetallic chains: a novel class of one-dimensional compoundsAlain Gleizes and Michel VerdaguerCite this: J. Am. Chem. Soc. 1981, 103, 24, 7373–7374Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 Dec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTP-450-tpye dioxygen activation using hydrogen/colloidal platinum as an effective electron donorIwao Tabushi and Akira YazakiCite this: J. Am. Chem. Soc. 1981, 103, 24, 7371–7373Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published i…
Defect statecalculations have been per formed for polyacetylene and polybparaphenylene in the fraamework of the Su, schriever, and Heeger Hamiltonian. In polyacetylene, the study of the energetics of the separation of the radical(natural defect)-ion(charged defect) pair induced upon doping indicates that the two defec…
SUMMARY This report deals with the cutting of wood specimens for observation in the scanning electron microscope. Several cutting devices and types of knives are described and critically evaluated.
Trans-aconitate synthesis via citrate dehydrase was determined in crude extracts of maize (Zea mays L.) coleoptiles. Two molecular forms of this enzyme were purified by substrate-specific elution from DEAE-cellulose, ammonium sulfate precipitation, and gel filtration. Each molecular form migrates as a single band in i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer and Moessbauer spectra of axially substituted iron phthalocyaninesGuy V. Ouedraogo, Claude More, Yves Richard, and David BenlianCite this: Inorg. Chem. 1981, 20, 12, 4387–4393Publication Date (Print):December 1, 1981Publication History Published online1 May 2…
The theoretical Pourbaix diagram for the aluminum-water system does not take into account pitting corrosion, the usual form of corrosion for aluminum in chloride containing environments. To obtain a practical representation of aluminum corrosion usable in sea water, pitting potentials, protection potentials, and unifo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonochemistry and sonocatalysis of iron carbonylsKenneth S. Suslick, Paul F. Schubert, and James W. GoodaleCite this: J. Am. Chem. Soc. 1981, 103, 24, 7342–7344Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 December…
Positive temperature coefficient (PTC) resistors for use as overcurrent protectors are now available with normal conduction mode resistances of about 0.04\Omega. This resistance is significantly lower than devices made from heretofore available barium titanate ceramics. PolySwitchTM overcurrent protectors are made fro…
The enzyme 1-aminocyclopropane-1-carboxylate deaminase (ACPC deaminase) from a pseudomonad is a pyridoxal phosphate (PLP) linked catalyst which fragments the cyclopropane substrate to alpha-ketobutyrate and ammonia [Honma, M., & Shimomura, T. (1978) Agric. Biol. Chem. 42, 1825]. Enzymatic incubations in D2O yield alph…
The Fabry-Perot interferometer is being applied increasingly as a tunable filter. The theoretical limits to its performance are considered, including the effects of phase change at multilayer reflecting coatings. Various forms of construction are discussed as are several ways of tuning Fabry-Perot filters. The review…
Abstract Two types of oxygen desorption from La1−xSrxCoO3 were revealed by the appearance of a broad desorption peak(α) below ca. 800°C and a sharp one(β) around 820°C. The binding energy of O ls level for absorbed oxygen was clearly different from that for lattice oxygen. Close examination shows that α is ascribable…
Abstract Aniline Black coatings were obtained on Fe anodes by electrolyzing a basic solution of aniline in a water—methanol medium. Allylamine (an inhibitor of Fe corrosion), although not essential to the process, imparts better efficiency to it. The deposited polymers contain 15–20% azobenzene and exhibit semiconduct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVanadium-catalyzed epoxidations. 2. Highly stereoselective epoxidations of acyclic homoallylic alcohols predicted by a detailed transition-state modelEdward D. Mihelich, Karen Daniels, and David J. EickhoffCite this: J. Am. Chem. Soc. 1981, 103, 25, 7690–7692Publication Date…