Materials Literature
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In tubular nanocomposites prepared from carbon nanotubes and polyaniline, carbon nanotubes can improve the structural ordering, compactness, delocalization of charges and carrier mobility. Such properties are very much critical in the case of organic semiconducting materials for electronics applications. In this paper…
We have investigated the electrochemical behavior, and chemical and photosensitized reduction of two dendrimers based on a 1,3,5-trisubstituted benzenoid core, which contain 9 and 21 4,4'-bipyridinium (usually called viologen) units, respectively, in their branches and are terminated with tetraarylmethane groups. For…
The electronic structure of ferroelectric Sr 0.5 Ba 0.5 Nb 2 O 6 thin film has been studied by soft-X-ray emission spectroscopy (SXES). In the valence band region, O 2 p and Nb 4 d partial densities of states are observed in the O 1 s and Nb 4 p SXES spectra. The energy position of the Nb 4 d state overlaps with that…
Abstract A mathematical model that describes the effect of conversion and polymerization temperature on the porosity of suspension poly(vinyl chloride) is proposed. The model considers that the packing of the primary particles that develop in the polymerizing drop begins at a conversion at which the particles become m…
Black single crystals of Ta(4)Se(9)I(8) are obtained in a high yield by heating Ta, Se, and I(2) at 300 degrees C in 1:2.2:1.0 molar ratio. In the structure, the tantalum atoms form a square, with four Se(2) ligands bridging the Ta-Ta edges and one capping the square. Each Ta atom has two terminal iodine atoms. The co…
Abstract A self‐made low‐frequency vibration‐assisted injection‐molding (VAIM) device was adopted to explore the relationship between mechanical property and morphology for high‐density polyethylene injected moldings. The main processing variables for the VAIM are vibration frequency and vibration pressure amplitude,…
First-principles calculations based on density functional theory are used to determine the structural, lattice dynamical, elastic, and thermodynamical properties of magnetic ${\mathrm{CuFeS}}_{2}$. The theoretical results are compared with available experimental data and are used as a basis to critically discuss exist…
This article describes a simple and versatile approach to the covalent attachment of ultrathin polypropylene films on silicon wafers. The immobilization was accomplished by way of the C–H insertion reaction of perfluorophenyl nitrenes generated by thermolysis or photolysis of perfluorophenyl azides. Covalently immobil…
This work presents a first-principles study of parallel and crossed junctions of single-wall carbon nanotubes (SWNT). The crossed junctions are modeled by two-dimensional grids of zigzag SWNTs. The atomic and electronic structure, stability, and energetics of the junctions are studied for different magnitudes of conta…
The domain contributions in the piezoelectric converse effect and the direct effect were compared for soft- and hard-PZTs (lead ziroconate and lead titanate solid solitions) by measuring piezoelectric constant d 33 as a function of frequency. The d 33 of the converse effect was determined from the electric-field induc…
The scattering profiles of gold nanoparticles prepared by means of two different methods were measured by the small-angle X-ray scattering, the profiles were found to be well reproduced by Γ-distribution function. This result suggests that the two methods yield nanoparticles with different average diameters and differ…
We demonstrated a fast-switching liquid crystal display with bent polymer fibrils templated from a nematic host with a bend structure. The morphology of the bent polymer fibrils, formed by photopolymerizing a small amount of reactive monomer in a liquid crystal host, depends on monomer concentration, condition of phot…
We present new quasi-elastic neutron scattering experiments and simulation analysis for studying the hydration water dynamics of N -acetyl-leucine-methylamide (NALMA) solutions as a function of concentration and temperature. The experiments show non-Arrhenius translational dynamics over the temperature range of −3 to…
Abstract Water sorption was studied at 20 °C on films composed of different natural polymers. Three polysaccharides were investigated: chitosan, cellulose, and alginate. The major differences between these polymers, from a structural point of view, lay in the substitution of an OH group by an NH 2 function for chitosa…
We synthesized special-pair/electron-acceptor systems consisting of a complementary slipped cofacial dimer of imidazolyl-substituted zinc porphyrin, bearing pyromellitdiimide as the electron acceptor. In the case of the dimer, the first and second oxidation potentials were split into a total of four peaks in the diffe…
We report on a polarization-sensitive optical gain in a blue-emitting Si/SiO(2) nanocrystalline system having a high degree of emission polarization memory. This system can show a positive optical gain or optical loss depending on the polarization state of the pump and emitted light. Under optical gain conditions, the…
This paper presents results on the selective ablation of individual single-walled carbon nanotubes by use of intense picosecond laser pulses. Linearly polarized pulses ablate only those tubes that are oriented substantially along the polarization direction. When applied to random submonolayer networks of tubes on soli…
Germanium quantum dots embedded in a SiO 2 matrix fabricated by selective oxidation of SiGe-on-insulator structure were examined by high-resolution transmission electron microscopy, cathodoluminescence spectroscopy, and spectroscopic ellipsometry. The dot size and crystallite morphology were strongly dependent on ther…
Using generalized-gradient-corrected full-potential density-functional calculations we have studied the magneto-optical properties of double perovskites ${A}_{2}B{B}^{\ensuremath{'}}{\mathrm{O}}_{6}$, $A=\mathrm{Ca}$, Sr, and Ba; $B=\mathrm{Fe}$; and ${B}^{\ensuremath{'}}=\mathrm{Mo}$, W, and Re. ${\mathrm{Sr}}_{2}\ma…
The local dynamics of water and its effect on the segmental mobility in the amorphous phase of polyamide 6,6 have been investigated. At 300 K and below, where the polymer segments undergo no significant motion (displacements below 2 Å, no reorientation) in the time scale of the simulation, water molecules exhibit most…