Materials Literature
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Semiconducting chalcogenide glasses, AI x Te 100-x with the atomic percentage of aluminium (x) varying between 15 and 25, have been prepared by the vacuum sealed-melt quenching technique. The I-V characteristics of these samples have been measured at four different temperatures using a custom-built PC-based system. Al…
A new hydrogen sensor utilizing plasma‐enhanced chemical vapor deposited diamond in conjunction with palladium (Pd) metal has been developed. The device is fabricated in a layered Pd/undoped diamond/p‐doped diamond Schottky diode configuration. Hydrogen sensing characteristics of the device have been examined in terms…
A continuum model is used to simulate transient convective transport phenomena numerically during solidification of a Pb-19 percent Sn alloy in an experimental test cell. Solidification occurs in an axisymmetric, annular mold of stainless steel, cooled along its outer vertical wall. Results show that, during early sta…
The aggregation of polystyrene latices sterically stabilized by poly(N-isopropylacrylamide) has been studied using dynamic light scattering. The time dependence of the aggregate growth could be monitored under appropriate experimental conditions. The measured fractal dimension was found to increase with an increase in…
Moriya's perturbation theory is applied to the distorted ${\mathrm{NiO}}_{2}$ and ${\mathrm{CuO}}_{2}$ planes, and the effective spin Hamiltonians are derived. Spin-wave theory is explored for the Hamiltonians, and the spin-wave excitations are studied for nickelates and cuprates with low-temperature orthorhombic and…
The clay minerals in the < 2 µm, and finer, size fractions of several horizons from each of five Australian soils of different types and from different locations have been analysed by X-ray diffraction, infrared spectroscopy, transmission electron microscopy and X-ray fluorescence. Samples from each profile con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe First Examples of Alkali Metal/Cu/Ce/Chalcogenides: The Layered Heterometallic Compounds KCuCe2S6 and K2Cu2CeS4Anthony C. Sutorik, Joyce Albritton-Thomas, Carl R. Kannewurf, and Mercouri G. KanatzidisCite this: J. Am. Chem. Soc. 1994, 116, 17, 7706–7713Publication Date (…
The compaction and heat‐treatment behavior of nanosize γ‐Al 2 O 3 powder (average diameter = 20 nm) was studied. A diamond anvil high‐pressure cell was used to compact the powder at pressures up to 3 GPa, both in air at room temperature and under liquid nitrogen, followed by pressureless heat treatment at 800°C. For a…
Under normal white light illumination and oblique observation, liquid crystal coating (LCC) color-change response to shear depends on both shear stress magnitude as well as the direction of the applied shear relative to the observer's line of sight. These color-change responses were quantified by subjecting a LCC to a…
Poly-3-hydroxybutyrate (PHB), a biopolymer of important commercial applications, is found in a wide range of Gram-negative and Gram-positive bacteria and cyanobacteria. The present study has resulted in the identification of PHB in the luminescent marine bacteria, Vibrio harveyi, in spite of it being previously classi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Convenient Synthesis of 2-Alkyl-5,10,15,20-tetraphenylporphyrins: Reaction of Metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with Grignard and Organolithium ReagentsMaxwell J. Crossley, Margaret M. Harding, and Charles W. TanseyCite this: J. Org. Chem. 1994, 59, 16, 4433…
Ionomers are an interesting class of high polymers that have been widely studied over the last few decades. They are now being utilized, or considered, for various industrial applications. Ionomers are ion-containing polymers, usually with an ion content up to 10 to 15 mol% . The presence of ionic groups and their int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Structures of Hexamine Cross-Linked Novolac Blends. 1. Blends with Poly(methyl methacrylate)Xiaoqing Zhang and David H. SolomonCite this: Macromolecules 1994, 27, 18, 4919–4926Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Publishe…
The binding of different inhibitors to glucoamylase G2 from Aspergillus niger and its temperature and pH dependencies have been studied by titration calorimetry. The enzyme binds the inhibitors 1-deoxynojirimycin and the pseudo-tetrasaccharide acarbose with association constants of 3 x 10(4) and 9 x 10(11) M-1, respec…
Abstract Two orientations of white micas with subordinate chlorite have been observed in a fine-grained (50 Å to 2 μ m) matrix of a Silurian lower anchizonal mudrock from central Wales: one parallel to bedding and one parallel to cleavage that is approximately 30°-50° to bedding. Bedding-parallel micas consist of smal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTspin-Crossover Behavior in the Fe(tap)2(NCS)2.cntdot.nCH3CN System (tap = 1,4,5,8-Tetraazaphenanthrene; n = 1, 1/2). Crystal Structures and Magnetic Properties of Both SolvatesJose Antonio Real, M. Carmen Munoz, Enrique Andres, Thierry Granier, and Bernard GalloisCite this:…
Abstract The functional aluminum alkoxide, Et 2 AlO(CH 2 ) 2 O‐C(O)C(CH 3 )CH 2 , is a very effective initiator for the ( D , L )‐lactide (LA) polymerization in toluene at 707deg;C. The coordination‐insertion type of polymerization is living and exclusively yields linear P ( D , L )‐lactide macromonomers of a pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the Structures of the Five-Coordinate Cobalt(II)Pyridine, Five-Coordinate Cobalt(III) Methyl, and Six-Coordinate Cobalt(III) Methyl Pyridine Complexes of OctaethylporphyrinJack S. Summers, Jeffrey L. Petersen, and Alan M. StolzenbergCite this: J. Am. Chem. Soc.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTC2H4 Insertion into PtII-SiH3 and PtII-H Bonds. An ab Initio MO/MP4 StudyShigeyoshi Sakaki, Masahiro Ogawa, Yasuo Musashi, and Toru AraiCite this: J. Am. Chem. Soc. 1994, 116, 16, 7258–7265Publication Date (Print):August 1, 1994Publication History Published online1 May 2002P…
The cumulative and comparative effects of chronological and actinic changes to the skin were studied in an elderly population. Two adjacent sites with different degrees of exposure to the sun were examined to distinguish the contribution of each factor, by means of noninvasive measurements. The following parameters we…