Repeated Removal of Thin Layers of Silicon by Anodic Oxidation
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Hydroxamic acid polymers. II. Design of a polymeric chelating agent for iron
Abstract The iron chelating ability of hydroxamic acid polymers was studied as a function of the atomic chain spacing separating neighboring hydroxamic acid units. Two polymers were prepared, one having the hydroxamic acid group separated by 11 atoms and the other by three atoms. The iron binding of these polymers was…
Localized electron states in the arsenic chalcogenides
In order to explain experimental observations on amorphous arsenic chalcogenides, it has recently been proposed that these compounds contain a high density of dangling bonds with rather special properties. However, chemical considerations raise doubts as to the plausibility of this model, which also does not readily a…
Crack Healing and Strength Recovery in UO 2
The kinetics of the final stages of crack healing and strength recovery are formulated from a simple mechanistic point of view. Experimental verification is obtained from literature data and from healing data on notched UO 2 bars with small cracks introduced by local thermal shock at the notch. The analysis indicates…
Semiporous Reinforcing Fillers for Composite Resins: I. Preparation of Provisional Glass Formulations
A conceptual means of obtaining improved bonding between filler particles and the polymeric binders of composites is presented. It involves preparing glass particles that separate into two interconnected vitreous phases when heated to an appropriate temperature, and then etching these to produce a porous surface layer…
Effect of Promoters on the Permeation of electrolytic hydrogen through steel
Abstract Measurements of the permeation rate of electrolytic hydrogen through steel membranes have shown that compounds of P, As, Sb, S, Se, and Te enhance the entry of hydrogen into the steel only under conditions resulting in the formation of hydrides of hydrides of these elements. It may be presumed that the hydrid…
Scanning auger electron microscopy at 30 nm resolution
Auger electron images and analysis have been obtained with a spatial resolution of 30 nm, using an ultra-high vacuum field emission scanning electron microscope fitted with a cylindrical mirror analyser. This represents a large improvement over currently available instruments, and has important implications for micros…
On the thermal degradation of poly(vinyl chloride). IV. Initiation sites of dehydrochlorination
Abstract A set of poly(vinyl chloride) samples were investigated with respect to their thermal stability. The dehydrochlorination rates were measured in nitrogen at 190°C by use of a very accurate, conductometric method. For all polymers studied, a significant molecular weight increase was observed after 0.4% conversi…
Electronic structure of transition metal thiocarbonyl complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of transition metal thiocarbonyl complexesDennis L. Lichtenberger and Richard F. FenskeCite this: Inorg. Chem. 1976, 15, 9, 2015–2022Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published inissue 1 September 197…
Cardiac Myosin from Pig Heart Ventricle. Purification and Enzymatic Properties
A method is described for the preparation of high purity myosin from the left ventricle of pig heart. The purified myosin was free from nucleic acid, actin, tropomyosin, troponin, the 150,000 molecular weight protein and other contaminants. Analyses of subunits in the purified myosin were carried out on 3.5% acrylamid…
An Instrument for the Rapid Automatic Measurement of Fiber Fineness Distribution
The design principles, construction, and operation of an instrument designed for the rapid measurement of the distribution of fiber fineness of wool are described. The instrument is based on an electro-optical measurement of the amount of light scattered from a directed beam by fiber snippets. The snippets are transpo…
Synthesis and Properties of Organocobalt(III)octaethylporphyrins
Abstract The syntheses of alkylcobalt(III)octaethylporphyrins(OEP) via nucleophilic attack of the Co(I) complex to unsaturated compounds are reported. Olefins with an electron-withdrawing group and acetylenes react with Co(I)(OEP), whereas olefins with an electron-donating group such as propylene and cyclohexene are u…
Magnetic properties of amorphous Fe-Si thin films
Magnetic properties of Fe1−xSix sputtered films were investigated in the range 0⩽x⩽0.43. The films were found to be amorphous for the compositions x⩾0.20. The magnetic moment change upon crystallization depends on x. The magnetostriction seems to be a predominant factor in determing the hysteresis loops. The films in…
A theoretical analysis of the factors determining the conformations and stabilities of oxy- and thiocarbanions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA theoretical analysis of the factors determining the conformations and stabilities of oxy- and thiocarbanionsNicolaos D. Epiotis, Ronald L. Yates, Fernando Bernardi, and Saul WolfeCite this: J. Am. Chem. Soc. 1976, 98, 18, 5435–5439Publication Date (Print):September 1, 1976…
High-efficiency blazed grating couplers
High-efficiency blazed grating couplers have been successfully realized by using an ion etching technique. We observed that a guided wave was radiated as the leaky wave which appears selectively either above or below the grating depending on the direction of the propagation of the guided wave. The coupling efficiency…
Grain-boundary diffusion in thin films: I. The isolated grain boundary
Diffusion through grain boundaries in thin films is analyzed using a model with a single high-diffusivity plane perpendicular to the film. One surface of the film is maintained at unit concentration of the diffusing species, and a zero-flux boundary condition is applied at the other surface. It is shown that the regio…
Magnetic ordering and domain-wall relaxation in zinc-ferrous ferrites
The magnetic data and permeability spectra of the ${\mathrm{Zn}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{O}}_{4}$ system have been obtained for $x=0, 0.2, 0.4, 0.6, \mathrm{and} 0.8$. The observations indicate existence of a Yafet-Kittel type of magnetic ordering in the mixed ferrites. The permeability spectra hav…
Luminescence quenching of the tris(2,2'-bipyridine)ruthenium(II) and tris(1,10-phenanthroline)ruthenium(II) cations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence quenching of the tris(2,2'-bipyridine)ruthenium(II) and tris(1,10-phenanthroline)ruthenium(II) cationsJ. N. Demas and J. W. AddingtonCite this: J. Am. Chem. Soc. 1976, 98, 19, 5800–5806Publication Date (Print):September 1, 1976Publication History Published onlin…
Packing Analysis of Carbohydrates and Polysaccharides. 7. Crystal Structure of Cellulose IIII and Its Relationship to Other Cellulose Polymorphs
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPacking Analysis of Carbohydrates and Polysaccharides. 7. Crystal Structure of Cellulose IIII and Its Relationship to Other Cellulose PolymorphsAnatole Sarko, Jeffrey Southwick, and Jisuke HayashiCite this: Macromolecules 1976, 9, 5, 857–863Publication Date (Print):September…
Oxidation of Si 3 N 4 in the Range 1300 ° to 1500 ° C
The isothermal oxidation behavior of commercial hot‐pressed Si 3 N 4 was evaluated for temperatures from 1300° to 1500°C. Multiphase scales were formed, consisting mainly of α‐cristobalite and enstatite. A large increase in reaction rate above 1450°C is believed to be caused by melting in the scale and the consequent…