Materials Literature
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Two new oxides, BaTeMo2O9 and BaTeW2O9, have been synthesized, by standard solid-state techniques, that have strong SHG intensities of approximately 600 x SiO2, on the order of LiNbO3. Both materials contain cations susceptible to second-order Jahn-Teller (SOJT) distortions, resulting in asymmetric coordination enviro…
We show that photovoltaic devices fabricated from blends of branched CdSe nanoparticles and a conjugated polymer give improved performance compared with devices made from nanorod/polymer blends. The improvement is consistent with improved electron transport perpendicular to the plane of the film. Solar power conversio…
We have recently demonstrated an approach based on the polyol process for the large-scale synthesis of silver nanowires with uniform diameters (see Sun, Y.; Gates, B.; Mayers, B.; Xia, Y. Nano Lett. 2002, 2, 165. Sun, Y.; Xia, Y. Adv. Mater. 2002, 14, 833. Sun, Y.; Yin, Y.; Mayers, B. T.; Herricks, T.; Xia, Y. Chem. M…
EPR studies on ${\mathrm{Gd}}^{3+}$-doped diamagnetic ${\mathrm{LaNbO}}_{4}$ and paramagnetic ${\mathrm{PrNbO}}_{4}$ crystals containing ${\mathrm{Nd}}^{3+}$ and ${\mathrm{Ce}}^{3+}$ impurity Kramers ions were carried out at the X band (9.61 GHz) in the 4--295 K temperature range. The observed asymmetry in the extrema…
Abstract Calcium carbonate scale represents a significant safety and operational problem in offshore carbonate fields operated by Saudi Aramco. Scale can form on any surface where the pressure drop is sufficient for the produced fluids to form the scale and unload entrained solids. These solids will deposit on wellhea…
Abstract Polyvinylpolysilsesquioxane (PVPS) organic–inorganic hybrid gel films comprising polyethylene and siloxane backbone linkages were prepared through two routes: trimethoxy(vinyl)silane (VTS) was first subjected to radical polymerization of the vinyl groups, followed by acid‐catalyzed hydrolytic polycondensation…
The mechanics of hydrogen-induced decohesion and subsequent void formation at the interface of an elastic inclusion embedded in a ductile matrix is studied in an effort to understand the micromechanics of hydrogen embrittlement in nickel-base alloys that fail by ductile intergranular fracture initiating at grain bound…
The crystal structure of Sb-II has been determined using angle-dispersive x-ray diffraction of synchrotron radiation. The crystal structure comprises an interpenetrating assembly of a tetragonal host sublattice with symmetry $I422$ and a tetragonal guest sublattice of symmetry $I422,$ which realize common a axes but d…
The dynamics of star polymers is investigated via extensive molecular and Brownian dynamics simulations for a large range of functionality f and packing fraction eta. The calculated isodiffusivity curves display both minima and maxima as a function of eta and minima as a function of f. Simulation results are compared…
Electronic and atomic structures of the clean, and As and Te covered Si(211) surface are studied using pseudopotential density functional method. The clean surface is found to have (2 X 1) and rebonded (1 X 1) reconstructions as stable surface structures, but no π-bonded chain reconstruction. Binding energies of As an…
We investigate the magnetothermodynamic properties of the perovskite manganite Pr0.46Sr0.54MnO3. Our data imply that the paramagnetic to antiferromagnetic transition at TN = 210 K is first order with an abrupt decrease of volume (~ 0.14 % in zero magnetic field) and is accompanied by a sharp anomaly in specific heat.…
As a guide to constitutive specification, driving forces for dislocation velocity and nucleation rates are derived for a field theory of dislocation mechanics and crystal plasticity proposed in Acharya (2001, J. Mech. Phys. Solids 49, 761–785). A condition of closure for the theory in the form of a boundary condition…
A critical power dissipation resulting from an oscillating magnetic field, Hp cos wt, can produce a magnetic breakdown field, H
Density functional theory calculations were used to investigate the mechanisms of NO−carbon and N 2 O−carbon reactions. It was the first time that the importance of surface nitrogen groups was addressed in the kinetic behaviors of the NO−carbon reaction. It was found that the off-plane nitrogen groups that are adjacen…
Electrochemical doping of HiPco nanotubes was studied in acetonitrile solution containing four different electrolytes (LiClO 4, NMe 4 BF 4, NBu 4 ClO 4, and NOct 4 ClO 4 (Me = methyl, Bu = butyl, Oct = octyl) and in two ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium hexafl…
The segmental dynamics in 1,2-polybutadiene was studied over a broad range of temperature and pressure using dielectric spectroscopy. The glass transition temperature was found to be strongly dependent on pressure (d T g /d P = 240 K/GPa). Moreover, while no appreciable change in the shape of the relaxation function w…
A novel material, amorphous nanostructured HAlO, has been synthesized by the reaction of various methylsiloxanes [e.g., (Me 2 HSi) 2 O] with the aluminum hydride H 3 Al·NMe 3 in ether or aromatic solvents under mild conditions. Its high surface area of ca. 250 m 2 /g is due to both its small particle size of approxima…
Rheological properties of a series of microbially synthesized poly(3-hydroxybutyrate- co -4-hydroxybutyrate)s, P(3HB- co -4HB)s, with different molecular weights and 4HB compositions have been systematically investigated. Capillary and oscillatory shear measurements have been carried out to characterize the flow behav…
The method of medial-reduction has been developed for the synthesis of carbon nanotubes and nanobelts. In this process, Mg was used as reductant, and Na 2 CO 3 and CCl 4 were used as carbon sources, respectively. X-ray power diffraction (XRD) patterns were used to identify the designed reaction process and carbon stru…
Zn and Pd complexes of meso-tetraphenyltetranaphthaloporphyrins (Ph(4)TNP) exhibit strong infrared absorption bands and luminesce in solutions at room temperature. S1 --> S0 fluorescence (lambda(max) = 732 nm, phi = 5.3%) is the predominant emission in the case of ZnPh(4)TNP (1). This emission is in part due to the de…