Materials Literature
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Abstract Electron microprobe analysis of the new mineral scotlandite yielded Pb 72.27, S 9.95, corresponding to PbO 77.85, SO 2 19.88, sum 97.73 wt.%. Secondary ion mass spectrometry showed the absence of Li, Be, B, C, N, and F, but the presence of very small amounts of Br. Infrared spectroscopy showed that the minera…
A method of determining the centroid of space in two-side metallized, thin polymer films is discussed. The method is a generalization of the well-known thermal pulse method and allows the determination of the mean depth without knowledge of the sample history. Results for electron-beam charged Teflon FEP films (25 μm…
Abstract The effect of particle size, type of crucible, and heating rate on the thermal curves obtained simultaneously for CuSO 4 · 5H 2 O were discussed. The dissociation steps were confirmed. Thermogravimetric techniques for determining the rate‐controlling processes and kinetic parameters were applied for the dehyd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoreversible gelation of poly(4-methyl-1-pentene) in cyclopentane and cyclohexaneGerard Charlet, Hong Phuong Nguyen, and Genevieve DelmasCite this: Macromolecules 1984, 17, 6, 1200–1208Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHypersensitivity in the 4f .fwdarw. 4f absorption spectra of neodymium(III) complexes in aqueous solutionEileen M. Stephens, Karl Schoene, and F. S. RichardsonCite this: Inorg. Chem. 1984, 23, 12, 1641–1648Publication Date (Print):June 1, 1984Publication History Published on…
The Smith–Purcell radiation from a charge moving across a penetrable grating is studied. We account for the finite permittivity and the absorption effect of the grating and find that enhancement of the radiation will occur near particular angles of observation at which the phase-matching condition for the excitation o…
Abstract The amount of cationic soluble polymer fixed by cellulose fibres, whose specific surface area is increased by beating, was determined by a colloidal titration method. A linear relationship between the polymer uptake and the surface density of carboxyl groups was obtained up to a beating degree of 54°SR. For h…
The nematic lyophase of disodium cromoglycate dissolved in water can be made chiral by adding a wide variety of amino acids whose ability to induce helicity is systematically studied. Long, bulky side chains lead to small helical twisting power (HTP), whereas increased hydrophilicity of side chains leads to larger HTP…
Structural disorder in severely ground MgCl2 is interpreted on the basis of a Bernoullian model with four parameters, specifying both the size and the statistical sequence of the layers; their choice completely dictates the intrinsic shape of all the X-ray diffraction lines. The X-ray powder spectra are reasonably wel…
Abstract Copolymers of trans ‐4‐acryloxyazobenzene ( AAB ) with (−)‐menthyl acrylate ( MtA ) have been prepared by free radical initiation; comonomer reactivity ratios have been found to be r AAB = 0.89 and r MtA = 0.53. Dependence of chiroptical properties on copolymer composition has been investigated and contributi…
Abstract An attempt was made to produce a new short‐chain alphatic polyamide nylon‐4,2. This polyoxamide can be prepared by polycondensation of tetramethylene diamine and diethyl oxalate. A high molecular weight polymer (η inh = 1.9 from 0.5% solutions in 96% sulphuric acid) has been obtained by employing a two‐step p…
An analysis is presented of the thermal stresses in brittle ceramics subjected to thermal shock by quenching into a liquid medium in which conduction is the primary mechanism of heat transfer. The magnitude of maximum stress was shown to be a function of the coefficient of thermal expansion, Young's modulus, and Poiss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParamagnetic hydride complexes of niobium(IV) and tantalum(IV)M. L. Luetkens, W. L. Elcesser, J. C. Huffman, and A. P. SattelbergerCite this: Inorg. Chem. 1984, 23, 12, 1718–1726Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inis…
Mechanical and surface properties were determined for polyester, cotton, and polyester/cotton blend knit fabrics. The polyester fabric showed a higher resistance to tensile deformation than the cotton fabric, while the blend fabrics showed an intermediate resistance in accordance with the blend level. This behavior wa…
Samples of crystalline hydroxyapatite [Ca5OH(PO4)3 HA] were prepared by precipitation from aqueous media under a variety of experimental conditions (temperature, concentration of reagents, rates of addition of the reagents, and seeding). The resultant products showed a wide range of particle sizes, i.e., specific surf…
Abstract Aromatic polyphosphonates of high molecular weights were prepared from phenylphosphonic dichloride and bisphenols having rigid ring structures by the two‐phase polycondensation in organic solvent–aqueous alkaline solution system with phase‐transfer catalyst at 0°C or below. The effects of reaction solvent and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic route to [Fe6S9(SR)2]4- clusters (R = alkyl). Their spectroscopic and magnetic properties and the solid-state structures of [Fe6S9(SCH2Ph)2]4- and [(Fe6S9(SMe)2)2Na2]6-Henry Strasdeit, Bernt Krebs, and Gerald HenkelCite this: Inorg. Chem. 1984, 23, 13, 1816–1825Pub…
Measurements on two systems (each with porosity φ=0.38) show that the ultrasonic response of fluid saturated granular composites is not easily predicted in terms of the acoustic properties of the individual constituents. In particular, systems comprised of unconsolidated glass and Plexiglas grains exhibit anomolous be…
Applying the theoretical results outlined in the first paper of this series, numerical estimates have been obtained for density fluctuation, Raman, and concentration fluctuation scattering losses in a number of materials which are under consideration as candidates for ultralow loss fiber-optic applications. The materi…
Isocitrate dehydrogenase kinase can use ATP but not other nucleoside triphosphates as a phosphate donor. It responds hyperbolically to both ATP and isocitrate dehydrogenase. The kinase is inhibited sigmoidally by low concentrations of DL-isocitrate and hyperbolically by ADP, AMP, NADPH, phosphoenolpyruvate and several…