Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and bonding of indium clusters: Na7In11.8, a novel network structure containing closo-In16 and nido-In11 clustersSlavi C. Sevov and John D. CorbettCite this: Inorg. Chem. 1992, 31, 10, 1895–1901Publication Date (Print):May 1, 1992Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the reactivity of S,N-derivatives of nickel with N-donor bases. Crystal structure and magnetic properties of the cubane cluster tetrakis(.mu.-hydroxo)tetrakis(.mu.-1,3-thiazolidine-2-thionato)tetrakis(pyridine)tetranickel(II)-dipyridineLoreto Ballester, Eugenio Co…
Abstract This paper is the first in a series of related papers describing the application of a diffusion/reaction model to the loss of antioxidants from polyolefins in hot‐water applications. The model, which is derived in detail, describes the time evolution of antioxidant concentration profiles in the exposed materi…
Abstract The peak value of tan δ at the glass-transition temperature ( T g ) in the plot of tan δ versus temperature is lowered on addition of filler to a rubber. This relative lowering of tan δ at T g can be used to estimate the filler distribution in an immiscible rubber blend. In the present investigation, distribu…
A homologous series of symmetric dimeric liquid crystals has been synthesized and its phase behaviour investigated. All members of the series were found to form glassy phases above room temperature.
Abstract Changes in polymer structure and antioxidant concentration have been systematically studied as functions of temperature, hoop stress, exposure time, and location in pipe wall on pressure tested pipes of medium density polyethylene. The pressure tests have been performed with water as the internal medium and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction through a croconato bridge: synthesis, crystal structure, and magnetic properties of (.mu.-croconato)bis[{bis(2-pyridylcarbonyl)amido}copper(II)] trihydrateIsabel Castro, Jorunn Sletten, Juan Faus, Miguel Julve, Yves Journaux, Francesc Lloret, and Santia…
Abstract We develop equations for numerically evaluating random uncertainties in Auger and x‐ray photoelectron spectroscopies. First, the general statistical theorems involving the chi‐squared (χ 2 ) distribution are clearly stated. These are applied to peak synthesis to determine the standard deviation uncertainties…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of a mononuclear copper nitrosyl complexSusan M. Carrier, Christy E. Ruggiero, William B. Tolman, and Geoffrey B. JamesonCite this: J. Am. Chem. Soc. 1992, 114, 11, 4407–4408Publication Date (Print):May 1, 1992Publication History Pub…
The room temperature structure of the ferroelastic and presumably ferroelectric Aurivillius type compound Bi5(Ti3Fe)O15 (Mr = 1484.4, Dx = 8.065 Mg/m3 Z = 4) was refined by X-rays on a weakly twinned crystal prepared in a Bi2O3/B2O3 flux with TiO2/Fe2O3 in stoichiometrical proportions. The lattice constants were found…
Electrically controlled lens properties (liquid crystal microlens) can be obtained by utilizing molecular orientation effects in an axially symmetric nonuniform electric field. Excellent lens properties can be obtained using a symmetric electrode structure with hole-patterned electrodes on both substrates. Several kin…
Methods for evaluating lifetime expectations are discussed. Factors that affect the life of bearings and brushes and of wire coil insulation are identified. Thermal life of insulation and methods for accelerated testing are discussed. Examples are included to assist in the calculation of such factors as motor temperat…
Amorphous zirconia precursors were made by the precipitation of a zirconium tetrachloride solution with either slow (8 h) or rapid additions of ammonium hydroxide at a pH of 10.5. Following calcination at 500°C for 4 h, the rapidly precipitated precursor exhibited predominantly monoclinic ZrO 2 phase, while the slowly…
The coexistence of the cubic fluorite and tetragonal phases in rapidly quenched samples was studied in the ZrO 2 ‐MO 1.5 systems for M = Sc, In, Y, and rare earths (R). Spontaneous transformation from metastable cubic phase was triggered at room temperature by a mechanical force. Isolated tetragonal platelets in the c…
Rubbing is a simple but reliable method used to homogeneously align liquid crystal. It is widely used in the actual production of liquid crystal displays. However, this technology is mainly based on experience, and the relationship between rubbing strength and surface anchoring strength has not been clarified. Therefo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of the "Al13" tridecameric aluminum polycation under diverse synthesis conditionsDavid R. Parker and Paul M. BertschCite this: Environ. Sci. Technol. 1992, 26, 5, 914–921Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeriodic ab initio Hartree-Fock calculations of the low-symmetry mineral kaoliniteAnthony C. Hess and Victor R. SaundersCite this: J. Phys. Chem. 1992, 96, 11, 4367–4374Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegment level chemistry and chain conformation in the reactive adsorption of poly(methyl methacrylate) on aluminum oxide surfacesK. Konstadinidis, B. Thakkar, A. Chakraborty, L. W. Potts, R. Tannenbaum, M. Tirrell, and J. F. EvansCite this: Langmuir 1992, 8, 5, 1307–1317Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonequilibrium molecular dynamics approaches to transport properties and non-Newtonian fluid rheologyPeter T. Cummings and Denis J. EvansCite this: Ind. Eng. Chem. Res. 1992, 31, 5, 1237–1252Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Pu…
Abstract At relatively high temperatures and low frequencies the electrical properties of many polymers are dominated by ionic conductivity. In cases where the glass transition is obscured by conductivity, it can be revealed by treating the data in terms of the electric modulus. The magnitude of the activation energy…