Materials Literature
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Abstract A modified model for a binary fluid is analysed mathematically. The governing equations of the motion consists of a Cahn–Hilliard equation coupled with a system describing a class of non‐Newtonian incompressible fluid with p ‐structure. The existence of weak solutions for the evolution problems is shown for t…
Abstract The rheological behavior of polyurethane (PU)/ N , N ‐dimethylformamide (DMF) spinning solutions with various contents of hyperbranched polyesters was studied using a RS150L‐controlled stress rotational rheometer. The results showed that the viscosity of the spinning solutions could be greatly reduced by addi…
Abstract A TTF‐TCNQ/PVC composite electrode is proposed as a voltammetric cation and anion sensor. The electrode relies on the principle that, during redox processes involving the TCNQ 0/− couple for cations and the TTF +/0 couple for anions, electrolyte ions are included into lattice sites in the charge neutralizatio…
A new method for the production of four-component (element or compound) combinatorial thin films is presented. The combinatorial thin film consists of nine continuous four-component regions producing planes in quaternary composition space. The method allows for the coverage of large continuous regions of quaternary or…
The laser ablation synthesis of carbon nanotubes is contrasted with the arc discharge method with respect to the synthesis product. A novel combination of two laser systems of different wavelengths for the laser ablation synthesis is presented. The impact of sulfur on the synthesis process is discussed. An excerpt of…
While La 0.7 Ba 0.3 MnO 3 is a ferromagnetic metal ( T C = 340 K)with long-range ordering, Nd 0.7 Ba 0.3 MnO 3 shows a transition around 150 K with a small increase in magnetization, but remains an insulator at all temperatures. Gd 0.7 Ba 0.3 MnO 3 is non-magnetic and insulating at all temperatures. Low field dc magne…
Abstract Calcium carbonate is the predominant filler used in polyvinyl chloride compounding. Selection of fillers, as in the case with other compounding ingredients, involves consideration of available types and their effects on processing, product properties, and economics. In this article the effect of the particle…
The present state of Raman scattering from carbon nanotubes is reviewed. In the first part of the presentation, the basic concepts of Raman scattering are elucidated with particular emphasis on the resonance scattering. The classical and the quantum-mechanical descriptions are presented and the basic experimental inst…
The dynamic process of charge injection is investigated for an open conjugated polymer chain in contact with a metal electrode in the framework of a nonadiabatic approach. It is found that the injected charges form wave packets due to the strong electron-lattice interactions in the conjugated polymer. A wave packet ma…
Abstract A continuous ultrasound‐assisted process using a single screw extruder with an ultrasonic attachment was developed to prepare PP/clay nanocomposites of varying clay concentrations. The feed rate that controlled the residence time of the polymer in the ultrasonic treatment zone was varied. Die pressure and pow…
FlaA1 from the human pathogen Helicobacter pylori is an enzyme involved in saccharide biosynthesis that has been shown to be essential for pathogenicity. Here we present five crystal structures of FlaA1 in the presence of substrate, inhibitors, and bound cofactor, with resolutions ranging from 2.8 to 1.9 A. These stru…
The quasiharmonic approximation has been applied to the potential hydrogen storage material ${\mathrm{LiBH}}_{4}$ and its decomposition products. Whereas the lattice constants that minimize the DFT potential energy give good agreement with the experimentally observed values, minimizing the quasiharmonic free energy wi…
A novel energetic smoothing mechanism in the growth of complex metal-oxide thin films is reported from in situ kinetic studies of pulsed laser deposition of on , using x-ray reflectivity. Below 50% monolayer coverage, prompt insertion of energetic impinging species into small-diameter islands causes them to break up t…
The electronic and atomic structure of SrTiO 3 crystals below the antiferrodistortive phase transition observed at 105 K is calculated using the hybrid B3PW functional as implemented in the ab initio CRYSTAL-2003 computer code. Such a combination of non-local exchange and correlation permits the calculation for the fi…
Abstract Polystyrene‐grafted multiwalled carbon nanotubes (PS‐ g ‐MWNTs) with a hairy‐rod nanostructure were synthesized by the in situ free‐radical polymerization of styrene in the presence of multiwalled carbon nanotubes (MWNTs) terminated with vinyl groups. To quantitatively study the molecular weight and compositi…
The temperature dependence of the zero-field susceptibilities of 2D and 3D Ising lattices with anisotropic coupling is analyzed. Infinite 2D and 3D lattices are approximated, respectively, by ensembles of independent L x oo and L x L x oo chain clusters that are infinitely long in the strong-coupling (J) direction. Th…
A highly soluble, conjugated Zn-porphyrin polymer was synthesized and found to strongly interact with the surface of single-walled carbon nanotubes, producing a soluble polymer-nanotube complex. Successful complexation required the addition of trifluoroacetic acid to the solvent (THF). It was found that the complex re…
Abstract The present contribution reports the fabrication and characterization of ultrafine polyacrylonitrile (PAN) fibers by electrospinning and further development of the as‐spun PAN fibers into ultrafine carbon fibers. The effects of solution conditions (i.e., solution concentration, viscosity, conductivity, and su…
The Y_0.5Ca_0.5BaCo_4O_7 compound exhibits four magnetic anomalies at the temperatures 387, 281, 52, and 14 K; all anomalies show characteristics typical for spin freezing into disordered states: frequency dependent transition temperature in the AC magnetic susceptibility together with relaxation of thermoremnant magn…
In this work we studied, by means of high-resolution neutron diffraction as a function of temperature, the La1.4Sr0.8Ca0.8Mn2O7 bilayered manganite for two different annealing treatments. Out data allowed us to shown, for the first time, the absence of long-range magnetic order in this optimally doped bilayered mangan…