Materials Literature
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To regulate the reactivity of dithiolene dioxomolybdenum(VI) complexes, two systems were studied: (1) chelate recognition with a diamide additive, 1,3-bis(isobutyrylamino)benzene (1); (2) a dithiolene complex with four amide substituents, (n-Pr(4)N)(2)[Mo(IV)O{S(2)C(2)(CONH(2))(2)}(2)].0.5(i-PrOH).DMF (2) (S(2)C(2)(CO…
OBJECTIVE: The main disadvantage of implanted cardiac valve bioprostheses remains primarily tissue failure due to calcification. Coating of bioprostheses with viable autologous endothelial cells may delay or even eliminate tissue calcification and subsequent cardiac dysfunction. METHODS: Glutaraldehyde-preserved Hanco…
Optical and structural properties of chemically deposited CdS films have been characterized by using spectroscopic ellipsometry and electron transmission microscopy. Three representative cases have been studied using grown metastable cubic film and two films annealed at 400 °C (30 min) with and without a CdCl 2 pretre…
The volumetric swelling ratios of three coals and their maceral concentrates in the presence of pyridine were determined by the displacement of a piston and by the measurement of swollen and unswollen particle size distributions using a laser diffraction particle size instrument. The use of particle size distributions…
Develops an understanding of the energy delivery system and determines how the scanning speed and part strength are affected by particular scanning parameters. Describes a high speed process workstation incorporating a variable beam spot size. Presents a more accurate sintering model which can be used to speed up the…
Carbon onions—concentric spherical graphite layers stacked one inside the other —are stable only during electron irradiation. If the irradiation is continued at high temperature, self‐compression is shown to occur, in which the individual layers are compressed until the onion cores finally transform into diamond cryst…
Abstract The characteristics of thermal degradation, peroxide induced degradation, and maleation of polypropylene have been modeled in a modular intermeshing twin screw extruder for a range of screw configurations and screw speeds. The models use the Akro‐co‐Twin Screw® formulation and account for starvation and fully…
Abstract Utilization of a less stoichiometric amount of aldehyde in portions and addition of water to the reaction mixture depressed the tar formation, affording much easier isolation of meso ‐tetraalkylporphyrins. The title porphyrins bearing methyl, ethyl, or n ‐propyl substituents were synthesized in isolated yield…
Ultrafine Ru particles were dispersed in micropores of activated carbon fiber (ACF). NO was efficiently and rapidly reduced to N 2 on the Ru particles through the disproportionation reaction of 3(NO) 2 = 2 NO 2 + 2 N 2 O in the micropore spaces at 303 K. The N 2 yield at 303 K was 0.8, and the half-life of the reducti…
Tetranuclear vanadium complexes with alkoxy ligands, [V(4)O(4){&mgr;,&mgr;,&mgr;(3)-(OCH(2))(3)CCH(3)}(2)(OCH(3))(6)] (1) and [V(4)O(4){&mgr;-(OCH(2))(3)CCH(3)}{&mgr;,&mgr;(3)-(OCH(2))(3)CCH(3)}{&mgr;,&mgr;,&mgr;(3)-(OCH(2))(3)CCH(3)}(OR)(3)] (R = C(2)H(5) (2), R = CH(CH(3))(2) (3), R = CH(3) (4)), were synthesized by…
Anodic coupling of 2,3,5-tris(4-pentoxy-2-thienyl)thiophene (an α,α-coupled terthiophene thiophene branched at the central thiophene ring) produces a polyconjugated polymer with a linear structure segmented by the thiophene branches. The conductivity (15 S cm - 1 ), confined in a narrow potential window (0.3 V) by cha…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionIsopiestic Investigation of the Osmotic and Activity Coefficients of Aqueous NaBr and the Solubility of NaBr·2H2O(cr) at 298.15 K: Thermodynamic Properties of the NaBr + H2O System over Wide Ranges of Temperature and PressureJoseph A. Rard and Donald G. ArcherCite th…
Highly crystallized polycrystalline films of BaWO 4 have been synthesized on tungsten metal substrates by hydrothermal-electrochemical and electrochemical methods from room temperature to 200 °C. The hydrothermal method did not produce a film because only discrete BaWO 4 particles appeared on the tungsten substrate. T…
New A-B type π-conjugated copolymers of N-alkylpyrroles and squaric acid have zwitterionic structure, analogous to squaraine dyes. These polymers are soluble in organic solvents, show solvent and pH-induced optical spectral changes, and are semiconducting.
A novel optical compensator with a negative birefringence structure is proposed to widen the viewing angle of twisted-nematic liquid-crystal displays (TN-LCDs). We describes the design concept and the simulation results to give a theoretical basis for the development of this new class of material. Computer simulation…
ESR spectra of oxochromium(V) porphyrins were obtained to investigate the electronic structure of the Cr(V)=O moiety. At room temperature, the chlorooxochromium(V) meso-tetramesitylporphyrin complex 1-Cl exhibits an isotropic ESR signal, split into nine signals due to hyperfine coupling with four equivalent( 14)N, at…
The crystal structure and absorption spectroscopy results of the Na(3)[Nd(TTHA)].2.5NaClO(4).7.617H(2)O compound are presented. The crystal structure of the complex was determined by X-ray analysis. Crystals are monoclinic, space group C2/c, with a = 38.446(8) Å, b = 10.552(2) Å, c = 25.796(5) Å, beta = 130.51(3) degr…
Treatment of (4-bromophenyl)diethoxymethylsilane with magnesium in THF gave poly[ p -(ethoxymethylsilylene)phenylene] ( 1a ) in 58% yield. Similar reactions of (4-bromophenyl)triethoxysilane and (3-bromophenyl)diethoxymethylsilane with magnesium afforded poly[ p -(diethoxysilylene)phenylene] ( 1b ) and poly[ m -(ethox…
The viability of using the reverse Monte Carlo (RMC) method for quantitative analysis of the diffuse X-ray or neutron scattering from single crystals of disordered materials is investigated. The method has been applied to a number of two- and three-dimensional model examples in which both occupational and displacement…
The human estrogen-related receptor �1 (hERR�1) is an orphan member of the steroid/thyroid hormone receptor superfamily. A cDNA encoding this protein was originally isolated on the basis of sequence similarity in its DNA-binding domain with estrogen receptor � (ER�). Previously, we reported the purification of hERR�1…