Materials Literature
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Rotational magnetization of grain oriented SiFe sheets involves three mechanisms: anisotropy, hysteresis and eddy currents. Apart from describing the respective physical background, the paper is focused on a separation of mechanisms. It discusses dependencies between field quantities which in the dynamic case are comp…
Sidechain liquid-crystalline polymers were prepared by the derivatization of three poly(4-hydroxystyrene) fractions of different molecular weights (Mw = 1.0 × 104, 2.2 × 104 and 3.0 × 104). 4-Cyanoazobenzene and 4-cyanobiphenyl were incorporated as mesogenic groups with ether-linked methylene spacers of varying length…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Orbital Displacement Analysis of Interactions in the Solid State. Application to the Study of Host-Guest Interactions in the Hofmann ClathratesEliseo Ruiz, Santiago Alvarez, Roald Hoffmann, and Joel BernsteinCite this: J. Am. Chem. Soc. 1994, 116, 18, 8207–8221Public…
As a result of experimental and theoretical progress over the last decade, our understanding of water treeing is approaching the molecular level at which the fundamental chemical nature of the phenomenon will be revealed. Further effort is required to complete the picture. The analytical techniques employed to date in…
Metal‐containing liquid crystals are a rapidly expanding field. Approavhes to the design and synthesis of high coordination number complexes with liquid crystal properties, such as the mesomorphic ferrocenes in the for example orthometallated imines, are discussed. magnified image
Abstract Dehydration and rehydration of a phlogopitic Mg-vermiculite were studied by thermo-analysis (TG, DSC) and in situ X-ray powder diffractometry. A detailed analysis of the relation between temperature and state of hydration of the vermiculite was rendered possible by use of slow heating rates in combination wit…
In this study, the corrosion and surface properties of four commercially available nickel-chromium dental casting alloys, were evaluated using electrochemical corrision testing and Auger electron microscopy. The corrosion tests were conducted under cell culture conditions of 5% CO 2 humidified atmosphere at 37 degrees…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Photochemistry of a New Photolabile Derivative of GABA-Neurotransmitter Release and Receptor Activation in the Microsecond Time RegionKyle R. Gee, Raymond Wieboldt, and George P. HessCite this: J. Am. Chem. Soc. 1994, 116, 18, 8366–8367Publication Date (Print):…
Stress corrosion crack growth by slip-dissolution was considered from the standpoint of electrolyte resistance and/or dissolved metal ion concentration in the crack, using a trapezoidal model crack geometry. The ohmic potential (IR) drop and dissolved metal ion concentration in a crack with a pre-existing active path…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Step Growth Hydrophobically-Modified Ethoxylated Urethane Associative ThickenersJ. Philip Kaczmarski and J. Edward GlassCite this: Langmuir 1994, 10, 9, 3035–3042Publication Date (Print):September 1, 1994Publication History Published online1…
The inclusion complex of catechin with cyclodextrins (CDxs) is examined by the use of 1H NMR, UV, and circular dichroism spectroscopies. The UV measurements demonstrate the existence of additional absorbing species of catechin in the presence of β-CDx. The 1H NMR provides evidence for the formation of inclusional comp…
An earlier idealized theory of fiber contact by Komori and Makishima is modified on the same geometric-probabilistic basis by taking account of steric hindrances be tween fibers. A new characteristic fiber length called the persistent length is introduced to define the basic fiber segments that can be treated as indep…
Electrochromic tungsten trioxide thin films were prepared by a photochemical vapor deposition. The source material was tungsten carbonyl. A 6 W low pressure mercury lamp was used as a light source. Amorphous tungsten trioxide thin films were obtained at a substrate temperature of 200°C. The UV radiation enhances the o…
Fabrication of ferroelectric Bi 4 Ti 3 O 12 thin films was carried out by dipping pyrolysis of metal naphthenates. Single-phase Bi 4 Ti 3 O 12 thin films with c -axis orientation perpendicular to the substrate surface were fabricated on Pt plates. They exhibited good ferroelectric properties: coercive field of 7.7 kV/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzaaluminatranes Exhibiting Unusual Coordination Geometries for AluminumJiri Pinkas, Tieli Wang, Robert A. Jacobson, and John G. VerkadeCite this: Inorg. Chem. 1994, 33, 19, 4202–4210Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Publ…
Abstract Ammonium-rich illite was identified in shales from the meta-anthracite coalfields of Zemplinicum (the Western Carpathians) together with K-illite and Na-illite using X-ray diffraction (XRD), infrared absorption and chemical analyses. The NH 4 -abundance in illite was quantified by the position of the 005 XRD…
2,9,16,23-Tetra-p-n-butylbenzyloxy-, 2,9,16,23-tetradiphenylmethoxy-, 2,9,16,23-tetramethoxymethoxy-, and 1,8,15,22-tetra-p-n-butylbenzyloxyphthalocyanines were synthesized from the appropriate phthalonitriles. Metal-free phthalocyanines were converted to their zinc derivatives. Cleavage from the appropriate precursor…
Abstract Ammonium polyphosphate is shown to be an effective flame retardant for homopolymeric and selected fibre‐forming copolymers of acrylonitrile. Compared with other phosphates and phosphorus‐containing species, it significantly increases both limiting oxygen index and char levels. The mechanism of retardancy is s…
Dielectric and light scattering measurements are performed in lanthanum modified lead zirconate titanate (PLZT) (6–8)/65/35 hot-pressed ceramics in order to refine the phase diagram. A relaxor-ferroelectric phase transition takes place in PLZT (6–7)/65/35 at temperature lower than the temperature of the dispersive die…
Abstract The properties of sphingomyelin obtained from bovine milk were investigated. In particular, the properties of liposomes and emulsions prepared from the spingomyelin, as well as the liquid crystalline behavior, were investigated and compared to those of related phosphatidylcholine systems. Like sphingomyelins…