Materials Literature
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In this paper we explore, by means of first-principles calculations, the influence of pressure and transition-metal $(T=\text{Fe},\text{Co})$ on the structure and lanthanum bare frequency in ${\text{LaFe}}_{4}{\text{Sb}}_{12}$ and ${\text{LaCo}}_{4}{\text{Sb}}_{12}$. The guest ion bare frequency decreases almost linea…
We investigate the van der Waals or interaction energy due to the plasmon modes in bilayer fermion and boson systems for several layer separation and coupling strength values. Interaction effects are studied within the random-phase approximation (RPA), the quasilocalized charge approximation (QLCA), and the Singwi, To…
The solubilities of isonicotinic acid in sulfuric acid + water and 4-methylpyridine + sulfuric acid + water have been determined experimentally from (293.55 to 361.45) K by a dynamic method. The experimental data were correlated with the modified Apelblat equation.
Abstract Structural evaluation of the ZnO epitaxial layers grown by plasma‐assisted molecular beam epitaxy (PAMBE) on the GaAs (111)B, c ‐plane (0001) and a ‐plane (11‐20) sapphire (α ‐Al2O3) substrates was demonstrated by using high‐resolution X‐ray diffraction (XRD). The in‐plane epitaxial relationships between the…
LaFexMnyAl12-x-yO19 hexaaluminate catalyst samples were prepared by a coprecipitation method and tested for N2O decomposition with high concentration (30%, V/V). The catalyst samples were characterized by X-ray diffraction, scanning electron microscopy, N-2 adsorption-desorption, ultraviolet-visible spectroscopy, and…
The main aim of this paper is to calculate the small but significant amount of heat lost from a graphite calorimeter absorber through connecting thermistor wires during electrical calibration. Taking into account the electro-thermal interaction between the heating thermistor and its surrounding environment, a more rea…
Fabrication techniques were developed for producing graded porosity B4C, and for producing aluminum-B4C and epoxy-B4C fuctionally graded materials. The key fabrication aspect was obtaining the graded porosity B4C. The feasibility of producing graded porosity B4C using a grading of carbon densification aid produced fro…
In isolation, both weak isomorphous/anomalous difference signals from heavy-atom derivatization and phases from partial molecular-replacement solutions for a subset of the asymmetric unit often fall short of producing interpretable electron-density maps. Phases generated from very partial molecular-replacement models…
Abstract Nonequilibrium molecular dynamics simulation data for a 12‐6 Lennard‐Jones fluid are obtained over a wide range of temperatures, densities and strain‐rates. The data, which cover 660 different state points, are used to deduce the nonequilibrium contributions to the energy and pressure of the fluid under stead…
Abstract The effects of pH value and precursors concentrations in the growth solution as well as of ultrasound irradiation on the properties of CdS:Mn nanoparticles in PVA matrix are studied. Analysis of the photoluminescence spectra indicates that the increase of the pH value in the growth solution leads to the incre…
We investigated the optical properties of ZnO nanorods on nanosilicon-on-insulator using variable temperature photoluminescence (PL) spectroscopy, and explored the contribution of exciton–phonon coupling and surface resonance effect on the emission characteristics of the nanorods. The low-temperature (<100 K) PL spect…
The thermophysical properties and phase behavior of polymer/liquid crystal systems are reviewed. These systems, often called polymer-dispersed liquid crystals (PDLCs), have a variety of applications encompassing electrically activated windows with controlled light transmission, display panels, fiber optics, and multip…
A liquid cross-linker, epoxidized linseed oil (ELO), was encapsulated in a plastic with a high glass transition temperature (poly( N -vinyl-2-pyrrolidone); PVP). The process parameters of the spray-drying employed were optimized by a Design-of-Experiments (DoE) approach. Three factors concerning both the dispersion fe…
The space-group symmetry of a crystal structure imposes a point-group symmetry on its diffraction pattern, giving rise to so-called symmetry-equivalent reflections. Instances in macromolecular crystallography are discussed in which the symmetry in reciprocal space is broken, i.e. where symmetry-related reflections are…
Nanostructured SiC and TiC have been synthesized through a novel process called as mechanically activated synthesis (MAS). The basic form of the MAS process is to mechanically activate reactants (e.g., SiO2 and C for synthesizing SiC, and TiO2 and C for synthesizing TiC) at room temperature through high energy ball mi…
The reaction of thio-phene-3-carboxaldehyde and perfluoro-benzyl-triphenyl-phospho-nium bromide in the presence of sodium hydride gave the title compound, C(12)H(5)F(5)S, in 70% yield. The thiophene and perfluorophenyl groups form a dihedral angle of 5.4 (2)°. The structure is characterized by a head-to-tail organizat…
Das planare, magnetische Isomer ist die stabilste Art von Fehlstelle im Zentrum einer Graphen-Flocke, während in Kantennähe das nichtplanare, nichtmagnetische Spiro-Isomer stabiler wird. Unter hohen Temperaturen wandern die Fehlstellen an die Peripherie der Flocke. Das Spiro-Isomer eignet sich als Strukturbaustein für…
In bcc metals, by reactions between primary dislocations of type a/2 , junctions with dislocations of type a are formed, which are glissile in {110} planes. The core structure of these dislocations in tungsten is studied within the framework of the Peierls model. When the dislocations are in or close to edge orientati…
A hot stage attached with a two‐beam interference (Pluta) microscope was used to apply a heating–cooling cycle (HCC) on low‐density polyethylene fibres (LDPE). The variation of the refractive indices (n ∥ and n ⊥) with the temperature was carried out during the heating and cooling of the LDPE fibres. The activation en…
A series of simultaneous interpenetrating polymer networks (SINs) based on pentaerythritol modified castor oil polyurethane and polystyrene were studied. Miscibility, phase continuity and phase separation are studied by dynamic mechanical thermal analysis (DMTA). The patterns of extent of the phase separation and the…