Materials Literature
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A series of dendritic core-shell structural polymers with different shell densities were synthesized based on dendritic polyester Boltorn H40 and were demonstrated to form unimolecular micelles in chloroform. The encapsulation mechanism study using Congo red as a guest molecule by fluorescence and UV-vis methods showe…
Complex wurtzite ZnSe microspheres with hierarchical fractal structure and showing strong quantum-size effects can be prepared easily by a mild solvothermal reaction in a diethylenetriamine (DETA)-deionized water (DIW) binary solution. The ZnSe microspheres are made up of nanosheets, each formed by the face-to-face pa…
The fluorescent properties of a new 1,3,5-cyclohexyltricarboxamide-based low-molecular-weight hydrogelator (1) derivatized with one hydrophobic fluorophore and two hydrophilic substituents have been investigated. Gels of 1 are composed of long, nonbranched fibers of uniform diameter, as shown by cryo-transmission elec…
In the colossal magnetoresistance manganites polarons have been proposed as the charge carrier state which localizes across the metal-insulator transition. The character of the polarons is still under debate. We present an assessment of measurements which identify polarons in the metallic state of ${\mathrm{La}}_{2∕3}…
The elastic deformation behaviors of perfect $\mathrm{NiAl}$ and $\mathrm{FeAl}$ are investigated using an ab initio electronic structure total energy method. The calculated ideal shear strengths for the ${112}⟨111⟩$ and ${110}⟨111⟩$ slip show qualitatively different features between the two intermetallics. In $\mathr…
In order to determine the local structure of Mn in $\ensuremath{\delta}$-doped GaAs layers we have carried out an x-ray absorption spectroscopy experiment at the Mn-K edge in samples grown by molecular beam epitaxy with and without Be co-doping. Mn-Mn atomic correlations have not been found within $\ensuremath{\sim}5\…
Solid‐state reactions have the potential for direct preparation of ceramic powders and offer a low‐temperature and low‐cost alternative to conventional techniques for production of oxide powders. This paper describes a simple and effective mechanochemical method based on solid‐state reactions during ball milling for s…
A new lattice gas model has been developed, describing the hydrogen storage in hydride-forming materials. This model is based on the mean-field theory and Bragg-Williams approximation. To describe first-order phase transitions and two-phase coexistence regions, a binary alloy approach has been adopted. A complete set…
Starre und stabförmige helicale Polyacetylen-Moleküle ordnen sich in Gegenwart von Lösungsmitteldämpfen hierarchisch auf Graphit an. Eine Monoschicht aus flach auf der Graphitoberfläche aufliegenden Polyacetylen-Molekülen dient als Fundament für helicale Polyacetylen-Moleküle, die chirale 2D-Bündel mit bestimmter Heli…
In this work we report on a low-energy electron diffraction (LEED) study of $\mathrm{MnO}(100)$ thick films grown on $\mathrm{Ag}(100)$ in order to determine their surface geometry. The LEED results indicate a topmost layer rumple of $(4.8\ifmmode\pm\else\textpm\fi{}2.0)%$ with the oxygen ions moving towards the vacuu…
Combustion synthesis (CS) of α‐silicon nitride (Si 3 N 4 ) powders was accomplished at a nitrogen pressure lower than 3 MPa. The combination of mechanical activation and chemical stimulation was effective in enhancing the reactivity of Si powder reactants, which was responsible for the reduction of the minimum nitroge…
A comprehensive numerical model of an indirect internal reforming tubular Solid Oxide Fuel Cell (IIR-T-SOFC) has been developed. Two-dimensional axisymmetry of the velocity, temperature, and mass transfer fields was assumed in the model, but accommodating the peripheral nonuniformity of electric potential and electric…
We calculate the guided band diagram of a metallic film with a one-dimensional periodic arrangement of cut-through subwavelength slits. We find that this system supports two distinct types of guided modes propagating in a direction perpendicular to the slits when the metal obeys a plasmonic dispersion model. The first…
A simple, efficient, and novel method was developed for the direct preparation of hydrophilic, bamboo-shaped carbon nanotubes by the pyrolysis of ruthenium(III) acetylacetonate in a Swagelock cell is reported. The obtained product exhibits mostly bamboo-shaped, straight, periodic twisted, multiwalled carbon nanotubes…
Amine functionalities were introduced onto the surface of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) films by applying radio frequency ammonia plasma treatment and wet ethylenediamine treatment. The modified surfaces were characterized by X-ray photoelectron spectroscopy (XPS) for chemical composition and Ram…
Silicon nanoparticles ranging from 2 to 16 nm were synthesized by a facile wet chemical route, in which SiO amorphous powder was annealed at 1000 °C, etched in hydrofluoric acid, and surface modified by alkene. After alkyl-termination of the particle surfaces, size selective precipitation technique was applied to sepa…
Syntheses of the four mixed phenol-pyridine derivatives 1,6-bis(2-hydroxyphenyl)pyridyl boron naphthalene (1), 1,6-bis(2-hydroxy-5-methylphenyl)pyridyl boron naphthalene (2), 1,6-bis(2-hydroxyphenyl)pyridyl boron 2-methoxylbenzene (3), and 1,6-bis(2-hydroxy-5-methylphenyl)pyridyl boron 2-methoxylbenzene (4) are report…
Despite the widespread use of gamma-Al2O3, there is still considerable disagreement over the nature of its structure due to both its poor crystallinity and differing preparation techniques during experimentation. Using density-functional theory (DFT) calculations and Rietveld simulations and refinement, the structure…
Abstract A combined approach towards ductile damage and fracture is presented, in the sense that a continuous material degradation is coupled with a discrete crack description for large deformations. Material degradation is modelled by a gradient enhanced damage‐hyperelastoplasticity model. It is assumed that failure…
The atomic-scale structure of nanocrystalline Ba x Sr 1 - x TiO 3 ( x = 1, 0.5, 0) powders has been studied using high-energy X-ray diffraction, Rietveld refinement, and the atomic pair distribution function technique. The studies show that the materials are well-ordered at nanometer length distances. The three-dimens…