Materials Literature
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Abstract A combined powder X-ray diffraction (XRD) and X-ray absorption (XAS) study of Fe(III) cation ordering within pyroaurite is described. It is concluded that there is no correlation between Fe(III) cation positions over distances of a few tens of angstroms, but that there is a very high level of local ordering,…
Water-soluble sodium poly(2-(3-thienyloxy)ethanesulfonate) and sodium poly(2-(4-methyl-3-thienyloxy)ethanesulfonate) have been synthesized. The sulfonic acid form of these new polymers has revealed a self-acid-doping reaction that leads to stable, highly conducting (0.5−5 S/cm) materials together with low absorption i…
We apply the molecular kinetic theory of wetting to the relaxation of the dynamic contact angle during the spreading of liquid droplets on solid surfaces. Experimental data have been obtained for several solid−liquid combinations and are successfully fitted using the theory. Physical parameters are extracted and inter…
The primary structure of the alpha-chain of preCol-D (molecular mass = 80 kDa), a tanned collagenous protein predominating in the distal portion of the byssal threads of the mussel Mytilus edulis, was deduced from cDNA to encode an unprecedented natural block copolymer with three major domain types: a central collagen…
Hydrothermal synthesis of barium titanate was done by both microwave heating and conventional heating. The synthesis process was evaluated by examining samples at different processing times by X-ray diffraction. For samples produced by both heating methods, the metastable cubic phase crystallized first and gradually t…
When treated with compressed CO 2, syndiotactic polystyrene (sPS) undergoes a number of solid−solid transitions that do not occur on treatment with liquid solvents. For example, planar mesophase → β, α → β, and γ → β transitions can be brought about under appropriate conditions of temperature and CO 2 pressure. In add…
Self-organization of a two-dimensional array of nanoholes which were formed by anodic oxidation of aluminum was investigated quantitatively using fast Fourier transformation (FFT) analysis of scanning electron microscopy (SEM) images. The highly ordered array of nanoholes with diameters of 26 nm was obtained by two-st…
Interaction of corrosion inhibitors with metal surfaces in acidic solutions was investigated using a nonlinear model encompassing the Langmuir adsorption isotherm. A regression equation, with a multiple correlation coefficient equal to 0.95, was derived between the efficiencies of corrosion inhibition and molecular de…
Recombinant Escherichia coli XL1-Blue harboring a high-copy-number plasmid containing the Alcaligenes eutrophus polyhydroxyalkanoate synthesis genes could efficiently synthesize poly(3-hydroxybutyrate) (PHB) in a complex medium containing yeast extract and tryptone but not in a defined medium. One of the reasons for t…
β-K 2 Bi 8 Se 13 ( I ), K 2 Sb 8 Se 13 ( II ), K 2.5 Bi 8.5 Se 14 ( III ), and K 2.5 Sb 8.5 Se 14 ( IV ) were synthesized by a molten flux method. The black needles of compound I were formed at 600 °C and crystallized in the monoclinic P 2 1 / m space group (No. 11) with a = 17.492(3) Å, b = 4.205(1) Å, c = 18.461(4)…
This work was directed at extending the use of lipase-catalyzed ring-opening polymerizations to cyclic carbonate monomers. Of the seven lipases screened for bulk trimethylene carbonate (TMC) polymerization (70 °C, 120 h), Novozym-435 from Candida antarctica gave almost quantitative monomer conversion (97%) and poly(TM…
Steady-state, CO-oxidation kinetics at 515 K have been measured on model, Pd catalysts, prepared by vapor deposition of Pd onto either zirconia, praseodymia, ceria, or a ceria-zirconia mixed oxide. A second rate process (RE2), associated with both the metal and the oxide support and observed previously on ceria-suppor…
Near-edge X-ray absorption fine structure, NEXAFS, spectroscopy was used to investigate the relaxations of polystyrene, a typical amorphous polymer, near a free surface after the imposition of a small deformation. Using synchrotron radiation, the NEXAFS dichroic ratio was determined for both the Auger and total electr…
We present in this work results from atomistic molecular dynamics simulations of a n -C 100 H 202 melt. This work represents a first effort to simulate a fully equilibrated ensemble of chains of sufficient length to follow Gaussian chains statistics and hence Rouse-like chain dynamics, employing well-validated, realis…
A method is described for the low‐temperature preparation of amorphous vanadates of general formula (R = In, Cr, Fe, Al, Y), and their electrochemical properties vs. Li are reported. A dissolution‐reprecipitation process from a mixed solution of and was used to prepare these compounds. By appropriate annealing of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDiscrete High Molecular Weight Triarylamine Dendrimers Prepared by Palladium-Catalyzed AminationJanis Louie, John F. Hartwig, and Albert J. FryView Author Information Department of Chemistry, Yale University P.O. Box 208107, New Haven, Connecticut 06520-8107 Department…
The dynamics of semi-flexible polymers and membranes is discussed. The effect of thermal undulations on both the transversal and longitudinal Mean Square Displacement (MSD) of a tagged “monomer” is studied in free polymers and membranes. The two MSDs are found to be proportional to one another, and behave as ∼t3/4 for…
GafChromic MD-55 is a fairly new, thin film dosimeter that develops a blue color (lambda max = 676 nm) when irradiated with ionizing radiation. The increase in absorbance is roughly proportional to the absorbed dose. In this study, GafChromic MD-55 was irradiated with 60Co gamma rays. A double irradiation method was u…
The sonoluminescence generated in water with pulsed 515 kHz ultrasound has been studied in the presence of different chain length (C 1 −C 5 ) aliphatic alcohols and the surfactants sodium dodecyl sulfate (SDS), dodecyltrimethylammonium chloride (DTAC), and N -dodecyl- N, N -dimethyl-3-ammonio-1-propanesulfonate (DAPS)…
Titanium dioxide, a large-bandgap semiconductor and versatile photocatalyst, has been grafted onto the pore surface of MCM-41 and FSM-16 (a mesoporous material derived from kanemite) by reacting TiCl 4 in hexanes with the as-synthesized mesostructured silicate. The products have been extensively characterized by powde…