Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT([2.2]Paracyclophane)gallium(I) tetrabromogallate(III): its synthesis and novel structural featuresHubert. Schmidbaur, Wolfgang. Bublak, Brigitte. Huber, and Gerhard. MuellerCite this: Organometallics 1986, 5, 8, 1647–1651Publication Date (Print):August 1, 1986Publication Hi…
Abstract The effect of alumina admixtures on the ionic conductivity of TlCl is studied. In agreement with the model of “Heterogeneous Doping” a change of the intrinsic anionic conduction (Cl ‐vacancies) into a Tl + ‐conduction (Tl + ‐vacancies) is induced at lower temperatures (≦ 300 K). The experimental conductivity…
We report detailed optical absorption spectra for Mn2+ in CaF2. The spectra from unirradiated samples, reported here for the first time, enable the 495-nm luminescence emission to be clearly assigned to a transition from the first excited 4T1g (4G) level to the 6A1g (6S) ground state. On the basis of the absorption cu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUpper excited-state emission of a covalently linked porphyrin dimerYoukoh Kaizu, Hideaki Maekawa, and Hiroshi KobayashiCite this: J. Phys. Chem. 1986, 90, 18, 4234–4238Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 Au…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of the [H6-nNi34(CO)38C4]n- (n = 6,5) and [Ni35(CO)39C4]6- clusters: molecular models for carbidized metal crystallitesAlessandro. Ceriotti, Anna. Fait, Giuliano. Longoni, Giampietro. Piro, Luigi. Resconi, Francesco. Demartin, Mario.…
Using a small-angle x-ray scattering technique, we have determined the sizes of side chain mesomorphic polymers diluted in a low-molecular-weight liquid crystal, respectively, parallel ( R ∥ ) and perpendicular ( R ⊥ ) to the director of the nematic medium ( n 0 ). We found a significant difference between the two val…
Abstract Differences in the temperature and pressure dependences of the relaxation times of a slow diffusional process and the α structural relaxation pose an interesting problem. This feature, observed by dynamic light scattering in amorphous poly(phenylmethyl siloxane), is related to another basic feature of lack of…
Abstract This paper presents new experimental data on the viscosity of ferrite‐filled polymers at high levels of loading. The choice of matrix and the choice of filler and filler loading has direct relevance to commercially important systems of magnetic plastics and rubbers. The effect of shear rate, concentration, an…
Abstract The heat capacity at constant pressure of liquid PEEK, poly(oxy‐1,4‐phenylene‐oxy‐1,4‐phenylene‐carbonyl‐1,4‐phenylene), has been measured by scanning calorimetry from 420 to 680 K, and that of PC, poly(4,4′‐isopropylidenediphenylene carbonate), from 325 to 610 K. These new data were combined with data‐bank d…
Auger electron spectroscopy and low‐energy ion scattering were used to assess surface composition of yttrium‐doped polycrystalline and single‐crystal α‐aluminas which were heated under vacuum to temperatures above 1500°C. Extensive surface and intergranular precipitation of yttrium aluminum garnet was observed in a co…
Al-Mn quasicrystals having icosahedral structure were prepared by melt-quenching, and the magnetic and electrical properties of both quenched and annealed specimens were investigated. The magnitude of the localised magnetic moments of Mn deduced from the Curie constant was qualitatively explained on the basis of the P…
Apparatus for collecting X-ray diffraction data from protein crystals at pressures up to 0.2 GPa is described. The modified techniques required for crystal mounting, determination of crystal orientation in the beryllium pressure cell, and centering in the X-ray beam are described. Special attention is required for int…
A search for specific proteins involved in newt limb regeneration, using monoclonal antibodies against forelimb blastemas, led to the detection of an antigen in the regenerate epithelium. Fluorescent-antibody-labeled cells first appeared just prior to blastema outgrowth. From bud through early digit stages this antibo…
A series of seven Y–Si–Al–(O,N) glasses with constant Y: Si: Al ratio and increasing substitution of nitrogen for oxygen has been investigated by 29Si NMR (MAS) spectroscopy. The spectra obtained are indicative of (i) nitrogen entering the glass network, and (ii) the coexistence of a variety of structural units. The d…
A monoclonal antibody (CC-212), obtained in a fusion experiment in which basal bodies from quail oviduct were used as immunogen, has been shown to label the apical pole of ciliated cells and to react with a 200-kD protein. This monoclonal antibody was demonstrated to be an anti-myosin from smooth muscle or from nonmus…
We report high-resolution x-ray scattering measurements of the critical fluctuations in mixtures of hexylphenyl cyanobenzoyloxy benzoate (${\mathrm{DB}}_{6}$) and terephtal-bis-butylaniline (TBBA). The phase sequence exhibited on cooling pure ${\mathrm{DB}}_{6}$ (or mixtures with a low concentration of TBBA), is nemat…
Abstract The yield of a nonpremixed series‐parallel reaction at complete conversion was measured in a turbulent, tubular‐flow reactor with single and multijet feeds. The yield of the intermediate decreased as mixing was slowed relative to the chemical kinetics, either by decreasing the Reynolds number, or by using a l…
Pyridoxal kinase has been purified 9000-fold from sheep brain. The purification procedure involves ammonium sulphate fractionation, DEAE-cellulose chromatography, affinity chromatography and Sephadex G-100 gel filtration. The final chromatography step yields a homogeneous preparation of high specific activity with a p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelical twist and spontaneous polarization direction in ferroelectric smectic liquid crystals. 2J. W. Goodby and E. ChinCite this: J. Am. Chem. Soc. 1986, 108, 16, 4736–4742Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue…
This paper summarizes the stress and fracture analyses of a three‐layer ceramic composite which is a fundamental building block for the monolithic solid oxide fuel tell currently being developed at Argonne National Laboratory. A small difference in the coefficients of thermal expansion of different layers can result i…