Materials Literature
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The effect of gamma-radiation on the surface chemical properties of polystyrene was studied by ESCA and FT-IR. Gamma-radiation produces surface >C=O and C-O containing functional groups only, and also causes oxidation to depths >10 nm as detected by ESCA. FT-IR spectra showed that below the top few molecular lay…
Abstract Structure, morphology, and chemical composition of illite/smectite (I/S) containing 30–50% smectite layers (% S) from Kinnekulle bentonites, Sweden, of diagenetic origin were examined using X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Interlayer arrangements of I/S changed from r…
ABSTRACT Changes in cell size and silica content were examined in response to aluminum additions in cultures of the acidophilic diatom Asterionella ralfsii var. americana Körn at pH 6.0. The effects of Al were examined over a range of steady‐state growth rates using silica‐limited semicontinuous cultures (Si:P = 8.0).…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEXAFS study of the carbon monoxide adsorption-induced morphology change in ruthenium clusters supported on aluminaTakanori. Mizushima, Kazuyuki. Tohji, Yasuo. Udagawa, and Akifumi. UenoCite this: J. Phys. Chem. 1990, 94, 12, 4980–4985Publication Date (Print):June 1, 1990Publ…
Previous measurements of refractive index vs wavelength for cubic zirconia were extended to include the variation of index with Y(2)O(3) stabilizer concentration. It was found that a three-term Sellmeier formula fits the index data for each concentration to within ~1 x 10(-4) and that the Sellmeier constants have a no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and magnetic properties of binuclear iron(III) complexes with oxalate, 2,5-dihydroxy-1,4-benzoquinone dianion, and squarate as bridging ligands. Crystal structure of (.mu.-1,3-squarato)bis[(N,N'-ethylenebis(salicylideneaminato))(methanol)iron(III)]Francesc Lloret,…
Abstract Six clays from volcanic ash soils at different stages of weathering differ in their relative halloysite content with respect to kaolinite and several surface properties, namely CEC, and exchange selectivity for K + . These three parameters are related to each other in that they all decrease with increasing so…
The first-order phase transition between paraelectric SmA and antiferroelectric SmC A * phases has been observed for the first time in ( S )-4-(1-trifluoromethylheptyloxycarbonyl)phenyl 4-(5-dodecyloxypyrimidin-2-yl)benzoate (TFMHPDOPB). Three pieces of evidence for the first-order phase transition are shown by means…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanion-supported metal carbonyls: synthesis and characterization of {[(OC)2Rh]5(Nb2W4O19)2}3-, {[(OC)2Rh]3(Nb2W4O19)2}5-, {[(OC)2Ir]2H(Nb2W4O19)2}5-, and [(OC)2Ir(P3O9)]2-W. G. Klemperer and D. J. MainCite this: Inorg. Chem. 1990, 29, 12, 2355–2360Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and characterization of binuclear manganese(III,IV) and -(IV,IV) complexes with ligands related to tris(2-pyridylmethyl)amineAderemi R. Oki, Joergen Glerup, and Derek J. HodgsonCite this: Inorg. Chem. 1990, 29, 13, 2435–2441Publication Date (Print):June 1, 1990Publ…
Although the technique of subureteral injection has been widely accepted as an alternative to reimplantation in the treatment of vesicoureteral reflux, the choice of the material to be used is controversial. We have used glutaraldehyde cross-linked bovine collagen to correct vesicoureteral reflux within the context of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetranuclear manganese-oxo complex with a 2.7-.ANG. manganese.cntdot..cntdot..cntdot.manganese separation and intramolecular water.cntdot..cntdot..cntdot.(.mu.-oxygen) hydrogen-bonded contacts: [Mn4O2(TPHPN)2(H2O)2(CF3SO3)2](CF3SO3)3. Possible mode for binding of water at th…
The paper examines the influence of joint geometry on the ability to transfer out-of-plane loads for a hull bulkhead joint in small boats. The hull bulkhead assemblies have been designed on the basis of sandwich beam and laminated plate theories. An analytical solution has also been developed to predict the failure lo…
The effect of fiber diameter, trigger geometry and section geometry on the crush response of pultruded glass fiber reinforced plastic tubes, made with either polyester or vinyl ester resin, was determined at crush rates from 2.1 x 10- 4 m/s to — 15 m/s. The rate dependence of the specific energy for the polyester resi…
Optical multislit spectra of globular clusters in two giant elliptical galaxies in the Virgo Cluster indicate average metal abundances of one- sixth and one-tenth solar composition for M49 and M87, respectively. These estimates are based on the strength of Mg lines. Taken together with observations of globular cluster…
SUMMARY The mechanism of sulphate (SO 4 ) adsorption was investigated using two highly‐weathered soils with contrasting surface‐charge characteristics (one with a net negative charge and the other with a net positive charge). The addition of SO 4 caused a release of OH and increased the adsorption of cations, in keepi…
Fourteen 14-mer peptides corresponding to a consensus sequence of metal-binding loops from proteins of the calmodulin family were synthesized. The effect of varying both the position in the binding loop, and the type of aromatic side chains as energy donors for enhancement of terbium luminescence, was studied. It was…
Abstract The response of advanced composites to low‐velocity projectile loading was investigated. The impact failure mechanisms of composites containing various fibers with different strength and ductility were studied by a combination of static indentation testing, instrumented falling dart impact testing, acoustic e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZinc(II) complexes and aluminum(III) porphyrin complexes catalyze the epoxidation of olefins by iodosylbenzeneWonwoo Nam and Joan Selverstone ValentineCite this: J. Am. Chem. Soc. 1990, 112, 12, 4977–4979Publication Date (Print):June 1, 1990Publication History Published onli…
Abstract: In order to study Al-Fe substitution, Fe-kaolinites were synthesized at 200°C from glasses (Si/(Al + Fe) = 1) with varying Fe content. XRD and IR spectroscopy showed that kaolinites with increasing Fe contents could be synthesized, and Mössbauer spectroscopy indicated that the iron is strictly ferric. Chemic…