Materials Literature
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Organic photochromic compounds await major commercial exploitation. The main characteristics of these materials are outlined and their applications are discussed. These include: optical data recording, optical data processing, optical waveguide components, inks for security applications, displays, variable density fil…
The domain wall stabilization caused by anisotropy induced during annealing has been studied in amorphous ribbons. It was found from domain observation that the regions where there existed domain walls during annealing tend to become nuclei of reverse domains as well as pinning sites of domain walls. The increased wal…
In the study of transient or steady-state eddy current effects, a general diffusion equation derived from Maxwell's equations is solved by a classical finite element method for the spatial problem with time discretization. The moving part of the system is taken into account by a mesh distortion where the mesh points a…
The phase diagram of the system U‐Mo‐O in the region UO 2 ‐MoO 2 ‐O was investigated by X‐ray phase analysis and electromotive force measurements. The isothermal section at 1000 K is presented. The free energy of formation of UMoO 5 was determined from the oxygen potential measurement by a ZrO 2 .CaO solid electrolyte…
Abstract A simple method for the synthesis of α,ω‐bis(vinylbenzyl) aromatic poly(ether‐sulfone)s ( 2 ) and their transformation into α,ω‐bis(ethynylbenzyl) aromatic poly(ether‐sulfone)s ( 4 ) is presented. This method involves a fast and quantitative Williamson etherification of the α,ω‐bis(hydroxyphenyl)polysulfone w…
A brief survey of the status of work in the higher induction and frequency ranges is given and recent papers on the measurement of rotational losses are reviewed. The determination of the magnetic losses in alternating fields is considered, in partucular regarding the performance of those magnetic circuits most widely…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalogs of the [Fe4S4]+ sites of reduced ferredoxins: single-step synthesis of the clusters [Fe4S4(SR)4]3- and examples of compressed tetragonal core structuresKarl S. Hagen, Alan D. Watson, and R. H. HolmCite this: Inorg. Chem. 1984, 23, 19, 2984–2990Publication Date (Print…
Abstract A comparative study of α- and γ-functiona1 sulfur-containing silane coupling agents in the silica-filled SBR cured by the conventional sulfur system showed that the influence of the silanes on the vulcanization kinetics and their coupling effectiveness depends on the structure and positioning of the rubber-re…
Abstract The lubrication mechanism in PVC was studied using calcium stearate and paraffin wax lubricants. Based on the results of the differential thermal analyses, percent haze, microscopy, metal release, Brabender fusion, and extrusion studies we have developed a new theory of PVC lubrication based on molecular stru…
Plates of chemically-vapor-deposited nonoxide ceramics (Si/sub 3/N/sub 4/, SiC, and B/sub 4/C) up to 3 mm thick with high purity and density were prepared at high deposition rates (>1 mm/h). High-resolution electron microscopy of these materials reveals that there exist no glassy layers or secondary phases at any grai…
Abstract A series of eight novel rubber-brass adhesion promoter systems are introduced and discussed. They can be divided in four categories, viz. , homogeneous inorganic polyborosilicates of cobalt or nickel; inorganic cobalt or nickel ions adsorbed on an inert substrate, e.g. , silica or alumina; metal-organic cobal…
A cube with twelve Au atoms on the sides and eight S atoms at the corners constitutes the structure of the novel thioaurate(I) ion [Au12S8]4⊖. It is obtained quantitatively as the yellow [Ph4As] salt on addition of Ph4AsCl to an aqueous solution of Au2S and Na2S. Very few examples of thioaurates(I) are known.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerric isoporphyrins from hydroperoxide oxidation of (tetraphenylporphinato)iron(III) complexesAvram Gold, W. Ivey, G. E. Toney, and R. SangaiahCite this: Inorg. Chem. 1984, 23, 19, 2932–2935Publication Date (Print):September 1, 1984Publication History Published online1 May…
Abstract The CO 2 permeation coefficient and the difficient were measured using the permeation time‐lag method for films of atactic polystyrene and high‐density polyethylene, each as a function of uniaxial draw ratio. The reduction of permeability with draw ratio is observed for polystyrene and for polyethylene. In th…
Abstract A bench‐top process for the extraction of cottonseed flakes with aqueous ethanol has been developed. The process consists of cottonseed meat flaking, drying and extraction with boiling, aqueous ethanol (95% by volume) at atmospheric pressure. The resulting miscella is chilled, producing free oil, emulsified o…
PrCo5permanent magnets have been produced with energy products ranging up to 26 MGOe and which are magnetically and chemically stable. These magnets typically have remanence of ∼ 10.5 kG and a coercive force of 4 to 5 kOe. The maximum energy product achieved is only about 60% of that theoretically possible, 39 MGOe. T…
Abstract Helical polyolefins (polypropylene (PP) and poly(1‐butene)) (PB‐1) possess crystallographic faces in which the side‐groups form well aligned rows. These structural features are shown, through a number of examples, to interact with linear polymers (polyethylene (PE) and polyamides) and nucleating agents. These…
The surface flashover of a Macor glass-ceramic conical insulator in ultrahigh vacuum is investigated using direct current (dc), alternating current (ac at 60 Hz), standard lightning impulse (1.2/50 μs), and combinations of dc+1.2/50 μs and dc+ac. The dc and the 1.2/50-μs flashover voltages are found to be at about the…
The remanence, Br, of sintered 2:17 RE-TM permanent magnets depends on saturation magnetization, Ms, particle alignment, and packing density. Methods to estimate upper bounds for Msand energy product, (BH)max, as a function of composition are presented. As Bris limited by processing variables, (BH)maxis limited by int…
The limited transparency of high N (13.3 at.%) glasses in the system Si‐Y‐AI‐O‐N was found to be due to Si precipitates that resulted from thermal decomposition during melting. Thermodynamic analysis supported experimental findings that decomposition in N 2 at 200 kPa resulted from oxide‐nitride reactions and not from…