Materials Literature
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The structure of the title compound is made up of vanadium oxide layers, with NH + 4 cations intercalated between the layers. Each pair of VO 5 square pyramids is bridged by an edge to form a double V 2 O 8 group. The V 2 O 8 groups are connected by sharing corners to produce a twisted zigzag chain. Each VO 6 octahedr…
The effects of fabrication process and solvent on the structure of polyaniline (PANI) emeraldine base films and their intrinsic properties are examined. Freestanding films of PANI base fabricated from N,N′-dimethyl propylene urea (DMPU) and N-methyl-2-pyrrolidone (NMP) solutions, by casting and spin-coating procedures…
Poly[3,4-bis(3-methylbutylthio)thienylenevinylene], poly[3,4-bis-(S)-(2-methylbutylthio)thienylenevinylene], poly[3′,4′-bis(3-methylbutylthio)-2,2′:5′,2″-terthienylene-5,5″-vinylene], and poly{3′,4′-bis-(S)-[2-methylbutylthio]-2,2′:5′,2″-terthienylene-5,5″-vinylene} have been synthesized. The synthesis starts from the…
The title compound, normal spinel nickel chromite, NiCr 2 O 4 , undergoes a cubic to tetragonal phase transition at low temperature. The crystal structure of the tetragonal phase at 200K was determined by single-crystal X-ray diffraction data. Details of the crystal information, including anisotropic displacement para…
Camphor sulfonic acid (CSA)–doped poly(o-anisidine) (PoAN) has been found to possess the electrical conductivity of 10 S/cm. This value is rather low compared to that of (≈200 S/cm) CSA-doped polyaniline, which may arise from a limited transformation of coil-like conformation to an expanded one. Viscosity data and opt…
The application of microwave energy to the processing of carbon fiber reinforced phenylethynyl-terminated polyimide composites (PETI-5/IM7) was investigated and evaluated with a variable-frequency microwave furnace. The thermal and physical properties of the composites were measured by dynamic mechanical thermal analy…
Vibrationally resolved negative ion photoelectron spectra of B3N− at 355 and 266 nm are presented. Two intense bands are observed with adiabatic detachment energies (ADEs) of 2.923±0.008 eV and 3.063±0.008 eV and markedly different photoelectron angular distributions. Aided by electronic structure calculations, the tw…
A theoretical mixed classical/quantal model for describing the optical properties of free and matrix-embedded metal clusters, based on the time-dependent local-density approximation, is presented. As compared to the previous models involving an inner or/and an outer dielectric medium, all the dielectric effects---scre…
De Haas--van Alphen and Shubnikov--de Haas oscillations in the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ have been studied at different orientations of the m…
The piezoelectric constant e31 measurement procedure is presented for sputtered lead zirconate titanate (PZT) thin films deposited on silicon substrates. With a simple cantilever used in the direct piezoelectric effect, it is possible to measure piezoelectric coefficients of unpoled and poled films. We discuss the pol…
We report on the optical properties of the hole-doped manganites ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}.$ Transmission and reflection of thin films are measured in the infrared at temperatures from 10 to 150 K using Fourier-transform spe…
X-ray scattering experiments have been performed on a quasi-one dimensional system, Ni 1- x Pd x (chxn) 2 Br 3 . Strong diffuse scattering was observed for x > 0.7, and it was interpreted as due to spatial inhomogeneity in the valence of metal ions. This inhomogeneity takes the form of CDW in which the metal ions with…
The surface stabilizing properties of different species X $(X=\mathrm{H},\mathrm{}\mathrm{F},\mathrm{}\mathrm{C}\mathrm{l},\mathrm{}\mathrm{Br})$ on B(111) and N(111) c-BN cluster surfaces, have been investigated theoretically within the density-functional theory method. Calculated adsorption energies indicated that a…
The purpose of this study was to develop a novel synthetic stabilizer of enzyme-linked antibody in the enzyme-linked immunosorbent assay (ELISA). The water-soluble amphiphilic phospholipid polymer, poly[2-methacryloyloxyethyl phosphorylcholine (MPC)-co-styrene (St)] was synthesized, and its stabilizing functions for t…
A new two-dimensional antimony sulfide has been synthesized under hydrothermal conditions in the presence of N, N ‘-bis(3-aminopropyl)ethylenediamine and characterized by single-crystal X-ray diffraction, thermogravimetry and elemental analysis. The product [C 8 N 4 H 26 ] 0.5 [Sb 7 S 11 ] ( M r = 1294.07) crystallize…
Phase transformations and magnetic properties of overquenched Pr7Fe88B5 ribbons during annealing have been investigated. X-ray diffraction and Mössbauer measurement indicate that melt spinning at different wheel velocities caused the as-quenched ribbons to have distinctive structures. Depending on their as-quenched st…
Effects of impurities with a strong and short-range potential are studied in carbon nanotubes within a k · p scheme. The calculated conductance approaches those obtained for nanotubes with a lattice vacancy when the strength of the potential is sufficiently large. The conductance at ε=0 is analytically shown to be qua…
In this article, we describe nanometer scale characterization of piezoelectric thin films of lead-zirconate-titanate. Using the electric field from a biased conducting atomic-force microscope tip, we show that it is possible to form and subsequently image ferroelectric domains. Using the cantilever in resonant mode, w…
Optically active 2,2′-bis(2-trifluoro-4-aminophenoxy)-1,1′-binaphthyl and its corresponding racemate were prepared by a nucleophilic substitution reaction of 1,1′-bi-2-naphthol with 2-chloro-5-nitrotrifluorotoluene and subsequently by the reduction of the resulting dinitro compounds. A series of optically active and o…
We have calculated the dielectric matrix for ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{BaTiO}}_{3}$ perovskites and for Nb metal by the extended linear augmented plane wave--$\mathbf{kp}$ method. Dipole-allowed transitions from localized semicore states generate strong local fields, which shift the optical absorption band…