Materials Literature
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The effects of corona discharge treatment on polyethylene and polypropylene homopolymers have been studied. X-ray photoelectron spectroscopy was used to determine surface compositions which were related to surface free energy estimates from contact angle measurements. Changes in composition and surface free energy wer…
Negative electrodes for use in nickel‐hydride batteries were prepared from MmNi 3.6 Mn 0.4 Al 0.3 Co 0.7 ( Mm = misch metal with the composition of 24.87 % La , 52.56 % Ce , 5.57 % Pr , 16.86 % Nd , and 0.14 % Sm ) alloy being mixed with RuO 2 or Co 3 O 4 powder. Then the hydrogen evolution reactions at the electrodes…
Multilayer semiconducting (Ba, Ca)TiO 3 ceramics having positive temperature coefficient of resistivity (PTCR) were fired in reducing-reoxidizing atmospheres using Ni–Pd alloys as internal electrodes. Nickel was added to palladium electrodes to form the ohmic contact between internal electrodes and ceramics. Samples w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for Intramolecular Exchange in Organic .pi.-Conjugated Open-Shell Systems: 3-Nitrenophenyl and 4-Nitrenophenyl Units Connected by 2,5-Furandiyl, 2,5-Thiophenediyl, and 2,5-Pyrrolediyl Nonalternant Exchange LinkersChris Ling and Paul M. LahtiCite this: J. Am. Chem. Soc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Frontier Orbital Density Functional Approach to Polarizability, Hardness, Electronegativity, and Covalent Radius of Atomic SystemsTapan K. Ghanty and Swapan K. GhoshCite this: J. Am. Chem. Soc. 1994, 116, 19, 8801–8802Publication Date (Print):September 1, 1994Publication H…
The reaction of sputter deposited layers of Ti on the (001) surface of a synthetically grown single crystal type IIb boron doped diamond has been investigated using Auger electron spectroscopy with depth profiling, Rutherford backscattering spectroscopy (RBS) and Raman spectroscopy. Electrical characteristics of the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtom-Based Modeling of Elastic Constants in Amorphous PolystyreneTuija Raaska, Satu Niemela, and Franciska SundholmCite this: Macromolecules 1994, 27, 20, 5751–5757Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 Sep…
The effect of molybdenum (Mo) content on the sulfide stress cracking (SSC) resistance of low-carbon (C), low-alloy steels in hydrogen sulfide (H2S)-saturated sodium chloride (NaCl) solution was investigated by conducting a constant-load test on four steels containing 0% to 0.45% Mo. The microstructures consisted of se…
A triazole‐nitronyl‐nitroxide radical (see Figure) combining a 1,2,4‐triazole function—which plays an important role in the field of spin transition compounds—and a nitronyl nitroxide radical— a magnetic building blick used in organic magnets — is reported. Its synthesis, crystyal structure, magnetic properties and sp…
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…