Materials Literature
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Un modele de reactions chimiques, durant la phase gazeuse, pour le silicium contenu dans les nuages interstellaires denses est developpe. Les abondances des molecules contenant du silicium sont determinees
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection of alkylperoxo and ferryl, (FeIV:O)2+, intermediates during the reaction of tert-butyl hydroperoxide with iron porphyrins in toluene solutionRamesh D. Arasasingham, Charles R. Cornman, and Alan L. BalchCite this: J. Am. Chem. Soc. 1989, 111, 20, 7800–7805Publicatio…
We investigated the structure of silk fibroin dissolved in water and in water-organic solvent mixtures by CD and small-angle x-ray scattering (SAXS). CD spectra indicated a disordered secondary structure in water and a beta-sheet conformation in aqueous organic solvents, such as methanol, dioxane, and trifluoroethanol…
The relation between the lifetimes of the triplet states of various porphyrins and their photosensitizing effects on the photodynamic therapy (PDT) of tumor has been examined. Diethylene-triamine pentaacetic acid ester of 4-[1-(2-hydroxy-ethyloxy)ethyl]-2-vinyl deuteroporphyrin-IX gallium (III) complex (Ga-DP), zinc (…
Abstract Aliphatic‐aromatic poly(amide‐imide)s with high molecular weight (η inh up to 2,91 dl/g in DMAc/5% LiCl) were synthesized by direct polycondensation reaction of imide‐containing dicarboxylic acids and aromatic diamines using triphenyl phosphite in N ‐methyl‐2‐pyrrolidone (NMP)/pyridine solution in the presenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the reduction of the nickel(II) complex of 5,10,15,20-tetraphenyl-21-thiaporphyrin to form corresponding nickel(I) complexesPiotr Chmielewski, Maria Grzeszczuk, Lechoslaw Latos-Grazynski, and Jerzy LisowskiCite this: Inorg. Chem. 1989, 28, 18, 3546–3552Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of dicyanoaurate(I) in aqueous solution: formation of nonmetallic clusters and colloidal goldShlomo Mosseri, Arnim Henglein, and Eberhard JanataCite this: J. Phys. Chem. 1989, 93, 18, 6791–6795Publication Date (Print):September 1, 1989Publication History Published…
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)…