Materials Literature
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Abstract The surface orientation and detailed defect microstructure of polycrystalline diamond can be observed in a scanning electron microscope through local changes in the surface conductivity. The electron contrast in uncoated samples is straightforward to distinguish when the rms surface roughness is less than abo…
This paper deals with a method for determining the complex permeability in analysis of hysteresis motors. The method assumes that the magnetic intensity distribution is sinusoidal in the direction of rotation. Analysis of the asynchronous speed of a hysteresis motor is then performed for cylindrical coordinates, using…
Abstract Polarized Raman spectra of BaCl 2 · 2H 2 O and their assignments are reported. The Raman intensity was analysed by means of the pair approximation and the many‐body interaction among induced dipoles. It was found that the many‐body treatment is more quantitative than the pair approximation, although the agree…
Abstract Crystallinity in PVC contributes significantly to the strength and resiliency of the polymer. Two types of crystallites have been described: a primary crystallite in the virgin powder state pictured as a platelet or flat needle‐like lamellar crystallite, and a secondary, fringed micellar crystallite from melt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of the Reduction of Manganese Porphyrins: Reaction at the Periphery of the Porphyrin RingRobert J. Balahura and Richard A. KirbyCite this: Inorg. Chem. 1994, 33, 6, 1021–1025Publication Date (Print):March 1, 1994Publication History Published online1 Ma…
Abstract The photo and thermal reactivity of nitroxyl radicals derived from di‐, (oligo)meric hindered amine light stabilizers (HALS) on iso‐octane, a model compound for polyprophylene, was studied and compared to that of monomeric 2,2,6,6‐tetramethyl‐ piperi‐dine‐N‐oxyl (TEMPO). The exchange‐interaction among >NO…
Abstract 2,3‐Epoxy‐1‐propanol has been introduced into isocyanate‐terminated polyurethane to form glycidyl‐terminated polyurethane resins. A series of glycidyl‐terminated polyurethanes based on hydroxyterminated poly(oxypropylene) (poly(oxypropylene) glycol, PPG), toluene diisocyanate (TDI), and 1,4‐butanediol (BD) wa…
The phase characterisation and morphologies of forms I and II terephthalic acid are presented. The structural nature of the II ↔ I polymorphic phase transition has been explored and form II shown to be more stable at room temperature and pressure. A new mechanism is proposed for the apparent stability of multiply twin…
Abstract An amorphous and a liquid‐crystalline side‐chain polymer containing stable nitroxyl radicals are synthesized, the free radical being located either in a piperidine N ‐oxyl or a 1,3‐oxazolidine N ‐oxyl moiety. These polymers are available by reaction of precursor polymer having a formyl group in every repeatin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Characterization of Five-Coordinate Aquo(octaethylporphinato)iron(III) PerchlorateBeisong Cheng, Martin K. Safo, Robert D. Orosz, Christopher A. Reed, Peter G. Debrunner, and W. Robert ScheidtCite this: Inorg. Chem. 1994, 33, 7, 1319–1324Publication…
The effects of wet-milling barium ferrite in the presence of cationic or anionic surface active substances have been investigated by X-ray diffraction and Mossbauer spectroscopy measurements. Evidence for superparamagnetic relaxation of fine particles, both in the surfactant assisted ball-milled samples and in samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-state isomerism in crystalline (trifluoromethanesulfonato)(meso-tetraphenylporphinato)iron(III) [FeIII(TPP)(OSO2CF3)]Jorge A. Gonzalez and Lon J. WilsonCite this: Inorg. Chem. 1994, 33, 7, 1543–1553Publication Date (Print):March 1, 1994Publication History Published onli…
Anisotropic magnetic properties of two grades of 0.27 mm thick 3.25% silicon grain-oriented electrical steels are investigated using Epstein size samples cut at 10/spl deg/ intervals between the direction of rolling and its transverse. The global anisotropic variation of the steel is shown to be directly proportional…
This paper reports the naphthalene base FLC mixture which provides an almost ideal bookshelf layer structure. The formation of the bookshelf layer structure may be governed by the naphthalene base FLC's particular phase sequence and the wide temperature range of SA phase. This paper also describe the layer tilt angle…
The prediction of iron losses in magnetic steels submitted to alternating pulse voltages is studied and an efficient method is proposed. It is developed by coupling the pulse voltage form factor and the loss separation model. Prediction of iron losses becomes possible directly from the loss model corresponding to the…
The magnetic field effect is considered on the solid-melt phase transformations. Using the thermodynamic method it has been shown that an external magnetic field may observably influence the parameters of the equilibrium solid-melt phase transformations.>
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTin Porphyrins. 6. Tin-119 Chemical Shifts and Line Widths of Tin(IV) Complexes of Tetraphenyl-, Tetra-p-tolyl-, and OctaethylporphyrinDennis P. Arnold and John P. BartleyCite this: Inorg. Chem. 1994, 33, 7, 1486–1490Publication Date (Print):March 1, 1994Publication History…
Abstract Soils with bisequel morphology and classified as Typic or Plinthic Paleudults are common in the Virginia Valley and Ridge Province. Horizons in the older materials have redoximorphic features that are strongly contrasting with respect to color and distinctness of boundary. Research documenting these horizons…
We review the focusing properties of a general planesymmetric dispersive system containing a varied line-space (VLS) grating as its dispersive element. A VLS grating is one whose grooves are straight and parallel (when viewed looking down the grating normal) but unequally spaced. Aberration terms for VLS gratings are…
Summary The contrast thicknesses ( x k ) of thin carbon and platinum films have been measured in the transmission mode of a low‐voltage scanning electron microscope for apertures of 40 and 100 mrad and electron energies ( E ) between 1 and 30 keV. The measured values overlap with those previously measured for E (≥ 17k…