Materials Literature
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The availability of the parent compound, meso-hexaethylporphodimetheneiron(II), [(Et6N4)Fe] (2), of this report results from a novel synthetic methodology that makes [Et6N4Li2] (1) easily available. The major focus is on how the axial positions, which are the key reactive sites in metalloporphyrins, and the electronic…
We report a detailed study of the electronic structure of ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3},$ to our knowledge the best room temperature thermoelectric material known to date, using angle-resolved photoemission. Dispersions of the valence bands were determined. A sixfold k-space degeneracy in the valence-band maximu…
Proceeding from recently published crystal field parameters, I demonstrate that the first-order spin reorientation transition point in DyFe12−xTix depends strongly on the value of titanium content x. This leads, due to inevitable small spatial variation of composition, to significant broadening of the first-order tran…
This work is concerned with four molten monohalides with different ionic radii ratios (RbCl, NaI, AgCl, and CuCl) and ideal isotopic systems of these salts with different ionic mass ratios. The velocity autocorrelation functions of the two ionic species in each melt have been studied by both a theoretical approximatio…
Formation of an insulating ground state in the salt of $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{I}$ was studied by measuring the temperature dependence of the electronic transport properties (the anisotropy of the resistivity, th…
We present a statistical model for studying excitation upconversion and migration caused by energy transfer between ${\mathrm{Er}}^{3+}$ ions in a glass matrix. Assuming a statistically uniform distribution of ions in the matrix we propose an approach for averaging the solution of the rate equations over possible ense…
For the purpose of simulating photon-stimulated field emission by taking account of three-dimensional aspects, a specific formulation of electronic scattering is developed. This formulation relies on both the transfer-matrix and Green's-functions formalisms. It is combined with a Floquet expansion of the wave function…
This letter uses the classical theories of liquid crystal physics to derive the Young–Laplace equation of capillary hydrostatics for interfaces between viscous isotropic (I) fluids and nematic liquid crystals (NLC’s), and establishes the existence of four energy contributions to pressure jumps across these unusual ani…
The title compounds, LiKB(4)O(7) and LiRbB(4)O(7), are newly developed non-linear optical crystals containing two kinds of anionic groups, namely (B(3)O(8))(7-) and (B(5)O(10))(5-). The (B(3)O(8))(7-) groups form infinite spiral chains parallel to the [100] direction, which are interconnected by sharing O atoms with (…
Comparative study of optical properties of alkylthio-group-substituted phthalocyanine rare-earth metal sandwich complexes ([(CnS)8Pc]2M,M=Eu,Lu,Tb) is presented. Photoluminescence and photoconductivity of [(CnS)8Pc]2M complex is very weak. Two photoluminescence bands were observed at around 400–650 and 720–800 nm in c…
We present an x-ray diffraction study of the vanadium-doped blue bronze ${\mathrm{K}}_{0.3}({\mathrm{Mo}}_{0.972}{\mathrm{V}}_{0.028}){\mathrm{O}}_{3}.$ At low temperature, we have observed both an intensity asymmetry of the $\ifmmode\pm\else\textpm\fi{}{2k}_{F}$ satellite reflections relative to the pure compound, an…
Microdomain structures and phase transitions in binary blends consisting of a highly asymmetric block copolymer and a homopolymer were investigated using transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and oscillatory shear rheometry. For the study, a polystyrene- block -polyisoprene- bloc…
A novel chemical solution deposition method has been developed for the preparation of ferroelectric strontium bismuth tantalate (SBT) thin films. The chemical process is based on the synthesis of air-stable solutions. Ferroelectric SBT films, derived from these solutions, have been crystallized by rapid thermal proces…
Friction force microscopy (FFM) was used to distinguish the different surface terminations on the nanoscale on atomically flat SrTiO3(001) surfaces, obtained by a combination of ultrasonic agitation and subsequent annealing in air at 1000 °C. The surface exhibits atomically flat terraces and sharp steps whose height i…
The electric field-induced antiferroelectric (AFE) to ferroelectric (FE) phase transition in lead strontium zirconate titanate (PSZT) ceramics was studied by means of dielectric, polarization, and strain hysteresis measurements. PSZT compositions with varying strontium and Zr/Ti ratio, located in the ferroelectric, an…
The precipitation of thermo-responsive polymers from solution on heating is a well-known phenomenon. But how do such polymers behave at interfaces? By direct observation, with surface plasmon resonance, of the thermo-responsive effect of a polymer grafted to a gold surface, it was shown that the polymer undergoes a ph…
UDP-3-O-(acyl)-N-acetylglucosamine deacetylase (LpxC) catalyzes the second step in the biosynthesis of lipid A in Gram-negative bacteria. Compounds targeting this enzyme are proposed to chelate the single, essential zinc ion bound to LpxC and have been demonstrated to stop the growth of Escherichia coli. A comparison…
Charge, spin, as well as lattice instabilities are investigated in isolated or weakly coupled chains of correlated electrons at quarter filling. Our analysis is based on extended Hubbard models including nearest-neighbor repulsion and Peierls coupling to lattice degrees of freedom. While treating the electronic quantu…
Local electronic properties of metallic-semiconducting carbon nanotube heterostructures are investigated by studying the behavior of the one-electron local density of states (LDOS) along the tubes. We determine how these properties change from the metallic to the semiconducting side of a nanotube junction. We show tha…
The magnetic properties of carbon nanohorns were investigated by electron spin resonance. Two decoupled electronic systems were found. The first one, which has a spin susceptibility linearly varying with temperature, was tentatively attributed to two-dimensional graphenelike sheets. The second contribution, showing a…