Materials Literature
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The structures of the alpha, beta and gamma polymorphs of quinacridone (Pigment Violet 19) were predicted using Polymorph Predictor software in combination with X-ray powder diffraction patterns of limited quality. After generation and energy minimization of the possible structures, their powder patterns were compared…
Poly(3hydroxybutyrate) (P(3HB))/Bioglass(®) composites incorporating multiwalled carbon nanotubes (MWCNTs) have been successfully prepared by the solvent casting technique. The microstructure, electrical properties and bioactivity of the composites were characterized using scanning electron microscopy, x-ray diffracti…
As a result of repeating carbon nanotube Y junctions periodically, super honeycomb structures have recently been proposed. In this paper, the mechanical properties of these structures are investigated by using the shell model of the finite element method. The study shows that the super honeycomb structures have great…
The direct current electrical conductivity of ternary 40TeO2–(60−x)V2O5–xMoO3 glasses prepared by press-melt quenching technique was studied at temperatures between 90 and 403 K. From the conductivity–temperature relation, it was found that the small polaron hopping (SPH) model was applicable at the temperature above…
A remarkable progress towards functional ferromagnetic semiconductor materials for spintronics has been achieved in $p$-type (Ga,Mn)As. Robust hole-mediated ferromagnetism has, however, been observed also in other III-V hosts such as antimonides, GaP, or (Al,Ga)As, which opens a wide area of possibilities for optimizi…
Ferroelectric glass–ceramics, with a basic composition (1− y )(Ba 0.70 Sr 0.30 )TiO 3 ‐ y (B 2 O 3 – x SiO 2 ), were synthesized by sol–gel method. The major crystalline phase is the perovskite, which exhibited volume nucleation. The formation of the crystalline phase, particle size, morphology, kinetics, and mechanis…
Recently, a new family of piezoelectric perovskite materials based on the solid solution (1− x )BiScO 3 – x PbTiO 3 was developed. This system was found to have a Curie temperature higher than 450°C and excellent piezoelectric properties near the MPB composition. Niobium, as a donor dopant in the piezoelectric system…
Strong nonlinear absorption is observed in nanocomposite films containing PbS nanocrystals of mean size of 3.3 nm stabilized in a commercial poly(vinyl acetate) glue by a novel and simple chemical route of synthesis. A significant blueshift of the optical absorption edge indicates strong quantum confinement. The mean…
Pure anatase TiO(2) nanorods with mesopores were synthesized by a simple and low cost microwave-assisted method when tri-block copolymer was used as a structure stabilization agent and TiCl(4) as metal precursor. TEM investigation showed that larger nanorods were assembled by pearl-necklace-shaped nanorods following a…
We study the resonating valence bond theory of the Hubbard-Heisenberg model on the half-filled anisotropic triangular lattice. Varying the frustration changes the wave vector of maximum spin correlation in the Mott insulating phase. This, in turn, changes the symmetry of the superconducting state that occurs at the bo…
The photocrystallographic investigation of the light-induced excited spin-state trapping effect in the dinuclear spin-crossover compound {[Fe(bt)(NCS) 2 ] 2 (bpym)} is reported. In this system, each of the two Fe sites may be either in the high-spin (HS) or in the low-spin (LS) state, so that the molecule corresponds…
We report the production and characteristics of natural cellulose fibers obtained from the leaves and stems of switchgrass. In this paper, the composition, structure and properties of fibers obtained from the leaves and stem of switchgrass have been studied in comparison to the common natural cellulose fibers, such as…
Defected fullerenes in nanopeapods form bonds with the encapsulating single-walled carbon nanotubes when irradiated by an electron beam leading to changes in the guest (fullerene) and the host (nanotube). Intrinsic reaction coordinate (IRC) analysis based on B3LYP hybrid density functional theory shows that a C1-C59 d…
A large number (>60) of nitrogen-containing type Ia natural diamonds, and nitrogen-free type IIa natural and synthetic diamonds, have been electron irradiated and their optical absorption spectra have been analysed in detail. The analysis reveals that the concentrations of vacancies [V] and interstitials [I0 ] in type…
Abstract Spintronik ist ein multidisziplinäres Forschungsfeld zwischen Physik, Material‐ und Ingenieurwissenschaften, aber auch ein neuer Forschungsbereich der Festkörperforschung. Für die verschiedensten Anforderungen müssen unterschiedlichste Materialien gefunden werden. Die Suche nach ferromagnetischen Halbleitern…
Propionic acid tethering hemicyanine dye molecules preferentially enter the channels of silicalite-1 films with the head part first, in water in the presence of tetrabutylammonium hydroxide (this is shown schematically in the figure), giving rise to high-concentration hemicyanine-incorporating silicalite films with hi…
Crystals of a hydrazinium-based copper(I) sulfide salt, N4H9Cu7S4 (1), have been isolated by an ambient temperature solution-based process. In contrast to previously reported hydrazinium salts of main-group metal chalcogenides, which consist of isolated metal chalcogenide anions, and ACu7S4 (A = NH4+, Rb+, Tl+, K+), w…
Nickel (Ni) nanoparticle‐dispersed amorphous silica (Si–O) powders were synthesized from chemical solution precursors. The high‐temperature hydrogen adsorption property of the precursor‐derived composite powders was investigated in comparison with the amorphous Si–O and Ni at 773 K. Among the three powder samples, Ni…
Relative displacements between the atomically smooth, nested shells in multiwalled carbon nanotubes (MWNTs) can be used as a robust nanoscale motion enabling mechanism. Here, we report on a novel method suited for structuring large arrays of MWNTs into such nanobearings in a parallel fashion. By creating MWNT nanostru…
A simple numerical approach for calculating the q -dependence of the scattering intensity in small-angle X-ray or neutron scattering (SAXS/SANS) is discussed. For a user-defined scattering density on a lattice, the scattering intensity I ( q ) ( q is the modulus of the scattering vector) is calculated by three-dimensi…