Materials Literature
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Electric field-induced deformation is studied in a unique hybrid-aligned nematic (HAN) cell, in which the director of a nematic liquid crystal (LC) with either positive or negative dielectric anisotropy is varied continuously, lying perpendicular to one substrate and parallel to the other. The experimental results sho…
Abstract Overall growth and dissolution rates of potash alum crystals have been measured over the size range 3 to 70 μm. The derived surface integration growth kinetics, which are found to be linear with respect to supersaturation and strongly size dependent, are evaluated in terms of the step model of crystal growth.…
Abstract The location of iron in five deferrated soil kaolinites and several reference samples has been investigated using chemical analyses, acid dissolution and electron paramagnetic resonance spectroscopy. The iron of most of the kaolinites can be divided into a 'structural iron' content, measured by the amount of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe dioxygen adduct of meso-tetraphenylporphyrinmanganese(II), a synthetic oxygen carrierBrian M. Hoffman, Charles J. Weschler, and Fred BasoloCite this: J. Am. Chem. Soc. 1976, 98, 18, 5473–5482Publication Date (Print):September 1, 1976Publication History Published online1…
We describe studies of the Pt(100) – (1×1) and Pt(100) – (5×20) surfaces with LEED, UPS, AES, and flash desorption spectroscopy. The clean Pt(100) – (1×1) surface is prepared by adsorbing CO, then reacting it off with oxygen ions in the form of CO2. The clean (1×1) surface formed is metastable, converting back to the…
Abstract Thermal behavior of glasses, as observed from the isobaric variations of volume, v , and enthalpy, H , is analyzed in terms of retardation kinetics. A phenomenological theory involving a single retardation time, τ, is developed, assuming that molecular mobility is controlled essentially by the actual free vol…
Abstract The drawing behavior of a series of linear polyethylene homopolymers with weight‐average molecular weight (M̄ w ) ranging from 67,800 to ∼3,500,000 and variable distribution (M̄ w /M̄ n = 5.1−20.9) has been studied. Sheets were prepared by two distinct routes: either by quenching the molten polymer into cold…
A review of the current understanding of nitric oxide production in hydrocarbon/air and hydrogen/air combustion processes shows that the extended Zeldovich mechanism yields accurate nitric oxide predictions for fuel/air equivalence ratios from zero to infinity for hydrogen combustion and from zero to about 1.5 for hyd…
The first part of this work concerns a thorough study of both global and local field equations that govern deformable (not necessarily linear elastic) ferrimagnets and antiferromagnets from a phenomenological viewpoint. The main tool used is a generalized version of d’Alembert’s principle, valid for both reversible an…
In previous publications the performance of a high field-high gradient magnetic filter was calculated using a particle trajectory model to obtain the capture cross section of the fibers. The configuration of the particle buildup was assumed to be constant without considering the forces on the particle after impinging…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInitiation of Polypropylene Photooxidation. 2. Potential Processes and Their Relevance to StabilityD. J. Carlsson, A. Garton, and D. M. WilesCite this: Macromolecules 1976, 9, 5, 695–701Publication Date (Print):September 1, 1976Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(vinylamine hydrochloride). Synthesis and utilization for the preparation of water-soluble polymeric dyesDaniel J. Dawson, Richard D. Gless, and Robert E. Wingard Jr.Cite this: J. Am. Chem. Soc. 1976, 98, 19, 5996–6000Publication Date (Print):September 1, 1976Publication…
Abstract Spanish montmorillonites from Frente Archidona were used to demonstrate the determination of charge density, CEC and, in mixtures, the montmorillonite content by the aikylammonium method. Special attention is directed to heterogeneous montmorillonites and the determination of the charge density distribution.…
Summary Thirty‐three samples of Ando soils were extracted by sodium pyrophosphate (O.IM; pH 10) and by dithionite‐citrate. The Al, Fe, and C contents of these two extracts offer a means of differentiating the status of humus in relation to Al and Fe in the different horizons. The humus that forms at first in the Al ho…
M H Loretto and R E Smallman London: Chapman and Hall 1976 pp ix + 134 price £5.50 (cased), £3.50 (paperback) This book, based on courses given by the authors at Birmingham University, is aimed at providing students and young experimentalists with simple explanations of transmission electron microscope techniques for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution Properties of Poly(D-β-hydroxybutyrate). 1. Biosynthesis and CharacterizationS. Akita, Y. Einaga, Y. Miyaki, and H. FujitaCite this: Macromolecules 1976, 9, 5, 774–780Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published i…
The helical rotary senses for a number of non-sterol cholesteric liquid crystals have been determined and from the results, a simple rule relating molecular structure, absolute configuration and twist sense is proposed. The rule has been used to predict correctly the helical twist senses for some new cholesterogens.
In the passive region of austenitic stainless steels alloyed with Mo, the formation of MoO42− ions can be expected in neutral halide solutions by the transpassive dissolution of Mo. It has been shown that MoO42− ions added to neutral NaCl solutions act as an effective inhibitor against pitting of austenitic stainless…
Abstract Cadmium sorption by montmorillonite from solutions in the 15 to 120 ppb range was studied in the presence of increasing concentrations of NaClO 4 , NaCl, and Na 2 SO 4 solutions. The ionic strengths ranged from 0.01 to 1.00. Increasing ionic strengths decreased the amount of Cd sorbed on the clay surfaces. Th…
Abstract An extensive study of the effects of stereoisomeric variations in aromatic polyimide structures on polyimide properties was conducted. The structural variations were incorporated into the polyimides through the use of two complete series of isomeric aromatic diamine monomers, the diaminodiphenylmethanes and t…