Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron octaethyltetraazaporphyrins: synthesis, characterization, coordination chemistry, and comparisons to related iron porphyrins and phthalocyaninesJeffrey P. Fitzgerald, Brian S. Haggerty, Arnold L. Rheingold, Leopold May, and Gregory A. BrewerCite this: Inorg. Chem. 1992,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriplet and singlet energy transfer in carotene-porphyrin dyads: role of the linkage bonds.Devens Gust, Thomas A. Moore, Ana L. Moore, Chelladurai Devadoss, Paul A. Liddell, Roel Hermant, Ronald A. Nieman, Lori J. Demanche, Janice M. DeGraziano, and Isabelle GouniCite this:…
Human lymphocytes were labeled with biotinylated anti-lymphocyte-directed monoclonal antibodies, to which streptavidin and subsequently biotinylated dextran-magnetite particles were coupled. This labeling resulted in a strong and selective negative contrast enhancement of lymphocyte suspensions at 2.0 T, caused predom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acids). 5. Calorimetric and morphological studies on the stereocomplex formed in acetonitrile solutionHideto Tsuji, Suong Hyu Hyon, and Yoshito IkadaCite this: Macromolecules 1992, 25, 11, 2940–2946Publication Date (Pr…
Viscosity of Simple Soda‐Silicate Glasses, 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log 10 viscosity amounting to 0.6, those of Washburn et al. , being relatively too high. If correction for this is made, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.beta.-Halogenated-pyrrole porphyrins. Molecular structures of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, and nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(pentaflu…
The spectroscopic properties, including emission spectra and lifetimes, absorption and diffuse reflectance spectra and excitation spectra, of the hexanuclear copper(I) and silver(I) clusters Cu6(mtc)6 (1), Ag6(mtc) (2), and Ag6(dtc)6 (3) (mtc = di-n-propylmonothiocarbamate, dtc = di-n-propyldithiocarbamate) are report…