Materials Literature
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The reaction of Cr0(C6MexH6-x)2 (x = 0, 3, 6), D, with TCNE, A, results in formation of 1:1 electron-transfer salts of [CrI(C6MexH6-x)2][TCNE] (x = 0, 3, 6) composition. The x = 0 and 3 complexes have been structurally characterized. The [CrI(C6H6)2]•+ salt belongs to the centrosymmetric P21/m space group [a = 10.347…
Neutron diffraction experiments have been performed on single crystals of ${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4}$. Above 70 K the structure is orthorhombic Bmab. At 70 K a first-order transition occurs to a crystal structure that we believe to be tetragonal P${4}_{2}$/ncm. With our resolution we see no splitting of th…
Hybrid gels, defined as gels from mixtures of polymerically and colloidally derived sols, offer many opportunities for crystalline microstructure development upon heating. In this study, hybrid mullite gels are formed by mixing a colloidal boehmite—silica sol with a polymeric aluminum nitrate—tetraethoxysilane‐derived…
X-ray photoelectron spectroscopy has been used to monitor the surface chemical changes occurring on type II carbon fibers exposed to air, oxygen, and nitrogen plasmas. In all cases the plasmas caused changes in surface functionality, in terms of both C-O and C-N functionality. Prolonged exposure to the plasmas caused…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonocapped tris(dioxime) complexes of technetium(III): synthesis and structural characterization of TcX(dioxime)3B-R (X = Cl, Br; dioxime = dimethylglyoxime, cyclohexanedione dioxime; R = CH3, C4H9)Elizabeth N. Treher, Lynn C. Francesconi, Jack Z. Gougoutas, Mary F. Malley,…
A model is developed to predict the in-plane elastic properties of compos ites reinforced with 3-D angle-interlock textile preforms. Straight yarn segments and microcells are utilized in a lamination analogy to predict the in-plane elastic constants. Numerical results for angle-interlock preforms are compared to preli…
SiO 2 films deposited by the decomposition of tetraethoxysilane (TEOS) at high temperatures have superior insulating properties and excellent step coverage, but are not compatible with aluminum metallization. Earlier work on the deposition of SiO 2 from TEOS concentrated on the properties of the film and on the modeli…
It is shown that Serratia marcescens exports a hemolysin to the cell surface and secretes it to the extracellular space. Escherichia coli containing the cloned hemolysin genes shlA and shlB exported and secreted the S. marcescens hemolysin. A nonhemolytic secretion-incompetent precursor of the hemolysin, designated Sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polyoxometalate pillared layered double hydroxides via calcined precursorsKennedy Chibwe and William JonesCite this: Chem. Mater. 1989, 1, 5, 489–490Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Septe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEthylene analogs of tetrathiafulvalene and tetraselenafulvalene: new donors for organic metalsToyonari Sugimoto, Hiroshi Awaji, Iwao Sugimoto, Yohji Misaki, Tokuzo Kawase, Shigeo Yoneda, Zenichi Yoshida, Tsunetoshi Kobayashi, and Hiroyuki AnzaiCite this: Chem. Mater. 1989, 1…
At the beginning we present a review of the historical development of first observations of domain structures in ferroelectric and ferroelastic crystals with a SEM. A theory of the charging mechanism of an insulating sample bombarded by an electron beam gives an interpretation of experimental observations of ferroelec…
Abstract Previous attempts to prepare monodisperse styrene/sodium styrene sulfonate copolymer latexes by batch, seeded, and semicontinuous emulsion polymerization were unsuccessful at high concentrations of the functional comonomer. Broad, and sometimes bimodal, size distributions, and large amounts of water soluble h…
The effects of various soil properties on ammonia (NH3) volatilization from soils treated with urea were studied by measuring the NH3 evolved when 20 soils selected to obtain a wide range in properties were incubated at ‐0.034 mPa soil moisture potential and 30°C for 10 days after treatment with urea. The nitrogen (N)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConstant-composition study of dicalcium phosphate dihydrate crystal growth in the presence of poly(acrylic acids)Zahid AmjadCite this: Langmuir 1989, 5, 5, 1222–1225Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Se…
The understory diatom species of Epithemia made up nearly 55% of the diet of the freshwater limpet Ferrissia fragilis, while these same diatom species made up <20% of the epiphyton assemblage on Nuphar leaves occupied by limpets. Furthermore, the larger, upright overstory diatom species had relatively low electivity v…
The in vitro fibril assembly of calf skin collagen was examined as a function of ionic strength and temperature. In a 0.03 M NaPi, pH 7.0, buffer, fibril assembly required a minimum critical concentration of collagen. At nearly physiological ionic strengths and temperatures, the critical concentration was less than 1…
<div class="htmlview paragraph">Decreasing the level of NOx and particulate matter simultaneously from the exhaust of diesel engines has been demonstrated using newly developed catalyst compositions. Ignition temperatures below 400°C were observed in laboratory tests using catalyzed diesel particulate traps moun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of hydrolysis of iodine monochloride measured by the pulsed-accelerated-flow methodYi Lai Wang, Julius C. Nagy, and Dale W. MargerumCite this: J. Am. Chem. Soc. 1989, 111, 20, 7838–7844Publication Date (Print):September 1, 1989Publication History Published online1 M…
1,10,-Phenanthroline (Phen) has been examined as a corrosion inhibitor for mild steel in 1 N H2SO4 acid solution by weight-loss and gasometric methods. Studies have also been made in 1 N HCl solution to compare the efficiency of the inhibitor in both acids. Activation energy in the presence and in the absence of the i…
A large number of high‐temperature experiments involving binary mixtures of alumina and aluminum carbide (Al 4 C 3 ) were performed to clarify the behavior of the aluminum oxycarbide Al 2 OC. It is first shown from heat treatments on the molar composition 55Al 2 O 3 ·45 Al 4 C 3 that, in conditions of stable equilibri…