Materials Literature
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Excitons in carbon nanotubes under axial magnetic field $(B)$ have been theoretically studied in the Su-Schrieffer-Heeger model supplemented by long-range Coulomb interactions. The $B$-induced symmetry breaking leads to splitting of the degenerate exciton energy levels, which could be seen clearly in the linear optica…
Abstract A temperature sensor based on an array of carbon nanowires written by a 30 keV Ga + focused ion beam on diamond substrate has been developed. The temperature sensitivity of the electrical conductuctance between the nanowires is explained by the thermal activation of charge carriers in a heterostructure graphi…
Pressure-temperature-volume (pVT) measurements were carried out on 2-(4-hexyloxyphenyl)-5-octyl-pyrimidine, a substance exhibiting nematic and smectic A and C polymorphism. Analysis of the longitudinal relaxation times obtained recently for elevated pressures [Czub et al., Z. Naturforsch. A: Phys. Sci. 58, 333 (2003)]…
Abstract A uniaxial natural fabric of Hildegardia populifolia was used as a reinforcement for a polycarbonate‐toughened epoxy. The Hildegardia fabric was treated with a 5% sodium hydroxide solution for 1 h. The fabric was spray‐coated with a 1% silane‐based coupling agent. The variation of the chemical resistance and…
Abstract Linear oligo(ferrocenylsilane) and hyperbranched poly(ferrocenylsilane) (LOFS and HPFS) were synthesized by polycondensation of 1,1′‐dilithioferrocene (FcLi 2 ) with dimethyldichlorosilane (Me 2 SiCl 2 ) and FcLi 2 with methyltrichlorosilane (MeSiCl 3 ) in THF under different conditions, respectively. The ele…
Two unlike dislocations gliding in parallel slip planes in a channel of a persistent slip band are considered. Initially they are kept apart in straight screw positions. As the dislocations are pushed by the applied stress between two walls in the opposite directions, they bow out and attract one another forming a dip…
Leakage-current and polarization-switching properties of defect-controlled Bi 2 WO 6 single crystals have been investigated along the crystallographic a axis at 25°C. High-pressure oxygen annealing decreased leakage current, indicating that electron is a detrimental carrier of the leakage-current property. 2-mol% Mn s…
This study analyzes the plastic deformation on the atomic scale of Cu nanowires (NWs) with [Formula: see text] and [Formula: see text] orientations during uniaxial tension and compression, using a molecular dynamic simulation. The maximum local stress (MLS) method is employed to evaluate mechanical behavior during def…
Abstract We report the synthesis and characterization of new organic/inorganic hybrid materials constituted of Ni(0) and Cu(0) nanoparticles and polypyrrole (PPy). Copper and nickel nanoclusters were synthesized by a chemical reduction of aqueous metal salt solutions by sodium borohydride. PPy/Ni(0) and PPy/Cu(0) comp…
WO3 and MoO3 are important hydrogen storage and transport materials capable of accommodating large quantities of hydrogen. Upon insertion of hydrogen, their properties change dramatically, giving rise to electrochromic and photochromic transformations that have been intensively investigated. The materials are also eff…
The mechanical properties of a rare sample of kaolinite macroscopic crystals were evaluated using instrumented indentation. The crystals were also characterized by X-ray diffraction, scanning electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy before and after heat treatment at 110…
This work presents the effect of NiO on the thermal behavior and the crystallization kinetics of glasses lying near the stoichiometric cordierite composition nucleated with TiO 2 . Three glasses with NiO content varying between 1 and 5 mol% have been synthesized in Pt crucibles. Activation energies for structural rela…
The self-assembly of Ge-O polyhedra by metal-complex templates leads to initial examples of open germanate structures under mild solvothermal conditions. These materials are constructed from Ge-O cluster building blocks (Ge7X19 (X = O, OH, or F) or Ni@Ge14O24(OH)3) and span the full range of dimensionalities from 1D c…
A new sum rule has been derived for the atomic force constants from the invariance of the potential energy under the rigid body rotation of a crystal. For instance, it is found that there are actually two force constants in the nearest-neighbour approximation of a face-centred cubic (FCC) lattice, rather than three fo…
Backgrounds of studies of ferroelectric surface carrier layer are discussed in view of domain engineering, memory applications and size effects. Experimental evidence that supports the intrinsic surface carrier layer is presented and is discussed. Especially, we show the surface conduction of BaTiO 3 single crystals i…
Hexagonal mesoporous silica materials were synthesized in an acidic medium using different chain length of the quaternary ammonium surfactants as a template. The effects of chain length on the physical property, morphology of mesoporous materials, and the temperature on synthesis of materials in C n TMBr–TEOS–HNO 3 –H…
Abstract Despite the unique applications of heat shrinkable PVC sheets in food packaging industry, a few works have been carried out on the shrinkage behavior of this kind of sheets. So, in our work, investigation of the shrinkability of PVC sheets and influence of different parameters on the above‐mentioned property…
Abstract Based on first‐principles calculations, the electronic structure and the associated magnetism of carbon‐doped rutile TiO 2 have been investigated in the frame of the generalized gradient approximation (GGA). We find that the carbon substitutional oxygen ions can induce a magnetic moment of about 2.0 µ B /C, b…
Abstract Novel approach of applying the ternary polymer blend of long‐chain branched polypropylene (LCB‐PP), conventional polypropylene (PP), and hydrogenated polydicyclopentadiene (hDCPD) has been employed to tensilize biaxially oriented polypropylene (BOPP) film in the machine direction (MD) by successive sequential…
Vorbildlich verknüpft: Das gezeigte polyphile Oligothiophenderivat bildet eine komplexe Flüssigkristallphase, in der sich die π-konjugierten stabförmigen Moleküle zu wabenförmigen Netzen quadratischer Zylinder anordnen (siehe Bild). Diese Struktur könnte ein Vorbild sein für Überstrukturen und Muster in Flüssigkristal…