Materials Literature
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The thermal stability of the ethyl, isobutyl, silaneopentyl and phenyl complexes 1–4 is surprising. At room temperature they are colorless, very volatile liquids and solids and are formed in a procedure (equation (a)), which is quite general.
Abstract Various approaches to the preparation and verification of single‐molecule single crystals are discussed for polyethylene and poly (oxyethylene). Analytic tools are electron microscopy, electron diffraction, and differential scanning calorimetry. The main difficulty in producing a single‐molecule single crysta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA reinvestigation of the molecular structures of cis-mer-MoOCl2(PR3)3: do bond-stretch isomers really exist?Keum Yoon, Gerard Parkin, and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1991, 113, 4, 1437–1438Publication Date (Print):February 1, 1991Publication History Publi…
The gene encoding aspartate aminotransferase of a thermophilic Bacillus species, YM-2, has been cloned and expressed efficiently in Escherichia coli. The primary structure of the enzyme was deduced from nucleotide sequences of the gene and confirmed mostly by amino acid sequences of tryptic peptides. The gene consists…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced resonance Raman scattering from cytochromes P-450 adsorbed on citrate-reduced silver solsBernard N. Rospendowski, Kim Kelly, C. Roland Wolf, and W. Ewen SmithCite this: J. Am. Chem. Soc. 1991, 113, 4, 1217–1225Publication Date (Print):February 1, 1991Publica…
Monte Carlo simulations are performed on the rhombohedral random-tiling model of icosahedral quasicrystals. Long-range order is observed in agreement with a squared-gradient form of the coarse-grained free energy, and the two independent phason elastic constants are determined. Schematic transmission electron microgra…
We found that the stable decagonal quasicrystal of Al-Cu-Co undergoes a structural change at low temperatures. The Al 65 Cu 15 Co 20 alloy quenched from 800°C shows diffraction patterns with sharp spots placed at nearly perfect decagonal symmetry positions, but by annealing at 550°C the diffraction patterns show a rem…
A metal-binding site consisting of two histidines positioned His-X3-His in an alpha-helix has been engineered into the surface of Saccharomyces cerevisiae iso-1-cytochrome c. The synthetic metal-binding cytochrome c retains its biological activity in vivo. Its ability to bind chelated Cu(II) has been characterized by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of capped cadmium selenide clusters by EXAFSMatthew A. Marcus, W. Flood, Michael Stiegerwald, Louis Brus, and Moungi BawendiCite this: J. Phys. Chem. 1991, 95, 4, 1572–1576Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Publis…
Antiferroelectric phases of MHPOBC were studied by means of thermal analysis, electrooptic measurements and conoscopy. It was found that the phase transitions are seriously influenced by the optical purity of the material. Subphases in the transition region of SmA (paraelectric) -SmC (ferroelectric)-SmCA(antiferroelec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntercalation of 2,2'-bipyridine and complex formation in the interlayer space of montmorillonite by solid-solid reactionsMakoto Ogawa, Toshinobu Hashizume, Kazuyuki Kuroda, and Chuzo KatoCite this: Inorg. Chem. 1991, 30, 3, 584–585Publication Date (Print):February 1, 1991Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalase modeling with metalloporphyrin complexes having an oxygen ligand in a proximal position. Comparison with complexes containing a proximal nitrogenAnne Robert, Bernard Loock, Michel Momenteau, and Bernard MeunierCite this: Inorg. Chem. 1991, 30, 4, 706–711Publication…
Selective growth of boron-doped homoepitaxial diamond films was achieved using sputtered SiO/sub 2/ as a masking layer. The hole mobility of selectively grown films varied between 210 and 290 cm/sup 2//V-s for hole concentration between 1.0*10/sup 14/ and 6.9*10/sup 14/ cm/sup -3/. The technique was used to fabricate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpoxidation of styrene with aqueous hypochlorite catalyzed by a manganese(III) porphyrin bound to colloidal anion-exchange particlesHayrettin Turk and Warren T. FordCite this: J. Org. Chem. 1991, 56, 3, 1253–1260Publication Date (Print):February 1, 1991Publication History Pu…
Using calorimetry and scanning electron microscopy we have investigated the formation energetics and kinetics as well as the phase behavior of an ultraviolet-cured polymer-dispersed liquid crystal (PDLC) system. The purpose of this work was to determine those cure conditions which lead to liquid crystal microdroplet f…
Abstract The effect of crosslinking on the stress ‐ strain curves and on the crack growth rate was investigated in three point experiments for notched samples of polyethylene, polypropylene, blends of PE and polypropylene, and PE filled with silica. The crosslinking was found to affect positively the tear resistance o…
Abstract— Several porphyrin esters used as models for polystyrene‐bound porphyrins have been prepared and their excited states have been studied by laser flash photolysis, IR phosphorescence of singlet molecular oxygen, O 2 ( 1 Δ g ), and steady‐state fluorescence. The photophysical properties of the porphyrin esters…
The apical third of 60 standardized, gutta-percha cones obtained from six different manufacturers were analyzed by scanning electron microscopy. Despite the fact that the majority of the commercial gutta-percha cones showed rather uniform and smooth surfaces, some displayed morphologic variations such as gross protube…
A SEM procedure for quantifying the percentage area of transgranular fracture and surface roughness was developed to study the fracture morphologies of stable and rapid crack growths in ceramics and ceramic matrix composites. The procedure utilizes software which interprets the SEM line scanning profiles. Results obta…
One option available to the design engineer who requires a permanent joining of thermoplastic parts is to weld them together.