Materials Literature
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The use of deuteration in concert with uniform 15 N, 13 C-labeling has been critical for the chemical shift assignment of several proteins and protein complexes over 30 kDa. Unfortunately, deuteration reduces the number of interproton distance restraints available for structure determination, compromising the precisio…
(001)-oriented heterostructures consisting of LaAlO3 substrates, SrRuO3 bottom electrodes, and Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) (70/30) films were deposited by pulsed laser deposition from Pb-enriched ceramic targets. The epitaxial growth of all layers was confirmed by four-circle x-ray diffraction. Film growth was ca…
In this article we report experimental results on the deformation and the critical breakup conditions of a single drop in a medium under simple shear flow. The role played by both drop and matrix elasticities is quantified by using constant viscosity elastic (Boger) fluids. The experiments were conducted using two tra…
The “3 + 1” route for porphyrinoid synthesis is an excellent methodology for preparing aromatic porphyrin analogues with six-membered ring subunits. Condensation of 5-formylsalicylaldehyde with tripyrranes 15, 24, and 25 in the presence of 5% TFA-dichloromethane, followed by neutralization and oxidation with DDQ, affo…
Spin fluctuation-induced superconductivity in two-dimensional organic compounds such as \kappa-(ET)_2-X is investigated by using a simplified dimer Hubbard model with right-angled isosceles triangular lattice (transfer matrices -\tau, -\tau^\prime). The dynamical susceptiblity and the self-energy are calculated self-c…
An in-situ hot pressing/solid-liquid reaction process was developed for the synthesis of dense polycrystalline Ti3SiC2 ceramics using Ti, Si, and graphite powders as starting materials. The present work demonstrated that this process was one of the most effective and simple methods for the preparation of dense bulk Ti…
The mechanism of luminance decrease in blue emitting phosphor after annealing has been studied. It was shown experimentally that annealing in air oxidizes and substantially changes the ion to an ion. This is also deactivates the luminescent center, thus decreasing emission. Furthermore, the compound , in which the val…
We report molecular-dynamics simulations of plastic deformation of Ni nanophase samples with different grain structures, temperature, and applied stress. We analyze the mechanical and thermal activation of the elementary process contributing to plastic deformation at the grain boundaries and provide a quantitative int…
Pore size engineering of silicates has always been a critical issue in the field of mesoporous materials design. A new method for obtaining silicates with pore sizes up to 11 nm and narrow pore size distributions is described by the authors. Treating non-calcined MCM-41 silicate in aqueous emulsions of long-chain alky…
Using broad-band dielectric spectroscopy (10−2–109 Hz) the merging of the α- and β-relaxations has been investigated for a polymer, syndiotactic poly(methyl methacrylate) (PMMA), in which the dielectric losses are dominated by a strong β-relaxation. The asymmetrically shaped β-relaxation cannot be described by a Cole–…
We study the electronic states of the anisotropic triangular lattice Hubbard model at half filling, which is a simple effective model for the organic superconducting $\kappa$-BEDT-TTF compounds. We treat the effect of the Coulomb interaction by the fluctuation exchange (FLEX) method, and obtain the phase diagram of th…
High-resolution calorimetric studies have been made of the liquid crystal phase transitions for several dispersions of 70-\AA{}-diam silica spheres (aerosil) in octylcyanobiphenyl (8CB) as a function of silica density ${\ensuremath{\rho}}_{S}.$ The excess specific heat peaks associated with the nematic-isotropic $(N\e…
Polarized Raman spectra of single and polycrystalline ${R}_{1\ensuremath{-}x}{A}_{x}{\mathrm{MnO}}_{3} (R=\mathrm{L}\mathrm{a},\mathrm{P}\mathrm{r};A=\mathrm{C}\mathrm{a},\mathrm{S}\mathrm{r})$ ceramic samples were studied as a function of temperature. For the rhombohedral ${\mathrm{LaMnO}}_{3.1}$ and ${\mathrm{La}}_{…
We study theoretically the phase diagram of perovskite manganites taking into account the double degeneracy of the ${e}_{g}$ orbitals in a ${\mathrm{Mn}}^{3+}$ ion. A rich phase diagram is obtained in the mean-field theory at zero temperature as functions of $x$ (hole concentration) and ${J}_{S}$ (antiferromagnetic in…
A new class of soluble electroluminescent poly(p-phenylenevinylene)s (PPVs) is introduced here. Alkoxy-substituted 2-phenyl PPVs (see Figure for a schematic representation) are found to exhibit very good solubility in the conjugated state, good film-forming properties, high molecular weights, and excellent electrolumi…
Abstract Partial oxidation of methane in monolithic catalysts at very short contact times offers a promising route to convert natural gas into syngas (H 2 and CO), which can then be converted to higher alkanes or methanol. Detailed modeling is needed to understand their complex interaction of transport and kinetics in…
Biologically controlled mineralization features an orchestrated balance among various controlling factors such as spatial delineation, template promotion, crystal growth modification and cessation, and so on. Highly ordered calcium carbonate lamellae formed in the nacreous layers of mollusk (aragonite), the foliated c…
Powder X‐ray diffractometry (XRD) and Raman scattering measurements were used to study the structural changes of compositionally homogeneous metastable ZrO 2 solid solutions induced by ScO 1.5 doping. The crystal structures of monoclinic, tetragonal, cubic, and rhombohedral (Sc 2 Zr 7 O 17 , ß‐phase) solid‐solution ph…
A laboratory study was conducted to elucidate the influence of chemical and physical parameters on corrosion of type 1018 carbon steel (CS, UNS G10180) and 5% Cr-0.5% Mo steel in oils containing naphthenic acids (NAs) for application to crude oil refinery systems. Effects of test duration, temperature, and acid concen…
Infrared spectroscopy has been used to analyze the structural changes in samples prepared by the sol-gel method. Silica gels were prepared from alcoholic solutions of tetraethylorthosilicate (TEOS) with different H2O/TEOS molar ratios. The IR spectra of these gels, in the Si–O bond stretching region, shows that their…