Materials Literature
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We demonstrate that performing a replacement reaction on single crystalline Ag nanospheres of approximately 10 nm in diameter in an organic solvent produces hollow Au nanocrystals with an octahedral shape. Different from those Au shells made by starting with Ag particles about 1 order of magnitude larger, which largel…
All-nanoparticle thin-film coatings that exhibit antireflection, antifogging (superhydrophilicity), and self-cleaning properties have been prepared via layer-by-layer deposition of TiO(2) and SiO(2) nanoparticles. The porosity and chemical composition of the coatings were determined using a simple method that is based…
Abstract We demonstrate the controlled preparation of Er‐ and Eu‐doped GaP‐oxide porous composites. The fabrication procedure entails the use of porous semiconductor templates and the impregnation of rare earth ions from a rare earth salt solution in alcohol and thermal treatment. The composites exhibit strong green a…
A simple numerical model for the impact excitation of erbium ions by hot carriers in reverse-biased erbium-doped silicon light-emitting diodes (LEDs) is proposed. The model involves the difference in Er 3+ excitation efficiencies by hot electrons and holes. Comparative analysis of the Er 3+ excitation efficiencies in…
This research relates to the characterization of the temporal evolution of the leakage current (LC) during ice accumulation, measured on three energized different ice-covered insulator types including two porcelain station insulators and one line insulator string. Each insulator was submitted to a wet-grown ice accumu…
Recently, a lattice gas model was presented and successfully applied to simulate the absorption/desorption isotherms of various hydride-forming materials. The simulation results are expressed by parameters corresponding to several energy contributions, e.g., interaction energies. However, the use of a model system is…
This paper presents results of partial discharge tests that have been carried out on high voltage instrument transformers. The goal is to develop diagnostic tools that, starting from partial discharge measurements, can provide indications on the degradation state of the paper/oil transformer insulation systems. Prelim…
Reactive blending is used as a tool for the synthesis of graft copolymers of poly(methyl methacrylate) and polyamide-6 (PMMA- g -PA). The grafting reaction occurs between the amino end group of PA and glutaric anhydride units randomly distributed along the PMMA backbone. The anhydride units are formed by thermal treat…
Katalytische Entgiftung: Eisen- und Mangancorrole zählen zu den effizientesten Katalysatoren für die Zersetzung von Peroxynitrit. Die Katalyserate des Eisenkomplexes ist höher als diejenige analoger Porphyrine, und mit dem Mangankomplex läuft eine Disproportionierung ab, deren Katalysezyklus abgebildet ist.
The influence of confinement, due to flat parallel structureless walls, on phase separation in colloid-polymer mixtures, is investigated by means of grand-canonical Monte Carlo simulations. Ultrathin films, with thicknesses between D=3-10 colloid diameters, are studied. The Asakura-Oosawa model [J. Chem. Phys. 22, 125…
A direct electrochemical refrigeration cycle (DERC) uses the entropy change of an electrochemical reaction to produce cooling. The cycle is Carnot limited. The electricity recycled in the DERC is much larger than the energy input to the system. Therefore, the system is sensitive to small inefficiencies in the internal…
In some SMA-actuated systems the stress of the SMA element changes as a result of the motion of the actuator. Such complex thermomechanical loadings, for example, take place in rotary SMA actuators. For this and similar SMA actuators, the phase transformation temperatures, that define the actuation of the SMAs, vary d…
Abstract While wood plastic composites have gained an increasingly large share of the market for decks and other outdoor structures, there are many questions about the long-term potential for biodeterioration of these materials. While the plastic does appear to retard moisture uptake, thereby slowing the rate of degra…
By means of adiabatic scanning calorimetry, we have studied the effect of the nonmesogenic solutes cyclohexane (CH) and biphenyl (BP) on the nematic-smectic-A phase transition in the liquid crystal octylcyanobiphenyl (8CB). For all concentrations of BP studied, the transition remains second-order. For 8CB+CH, however,…
Electrochemical behaviors of selected Dawson-type polytungstates including 2-K10[P2W15Mo2O61box] where the symbol [box] designates a vacant site, alpha2-K7[Fe(OH2)P2W15Mo2O61], alpha2-K8[Cu(OH2)P2W15Mo2O61], alpha1- and alpha2-K8[Cu(OH2)P2W17O61], alpha2-K8[Cu(OH2)P2W13Mo4O61], and alpha2-K8[Cu(OH2)P2W12Mo5O61] were i…
We explore the electromagnetic characterization of a planar artificial magnetic metamaterial. Because the composite structure is two- rather than three-dimensional, it does not form a medium with assignable bulk properties, such as the electric permittivity and magnetic permeability. However, we find that it is possib…
It is shown that in systems with electronic half-closed-shell configurations of degenerate orbitals, e(2) and t(3) (which have totally symmetric charge distribution), ground state distortions from high-symmetry geometries may occur due to a strong pseudo Jahn-Teller effect (PJTE) in the excited states, resulting also…
Monodisperse Co, Fe, and FeCo nanoparticles are prepared via thermal decomposition of metal carbonyls in the presence of aluminium alkyls, yielding air-stable magnetic metal nanoparticles after surface passivation. The particles are characterized by electron microscopy (SEM, TEM, ESI), electron spectroscopy (MIES, UPS…
Uniform ellipsoidal ZnO particles have been synthesized in an aqueous solution in the presence of triethonalamine (TEA) mediated by sonication at the temperature below 80 degrees C. Scanning electron microscopy observations reveal that the ellipsoidal particles are highly uniform with a hexagonal cross-section. The mo…
This paper reports a novel two-step one-pot all-electrochemical method for the preparation of interpenetrating conducting-polymer (polyaniline, PANI) semiconducting oxide (V 2 O 5 ) nanocomposites. In the method, a spongy interconnected PANI network is first deposited on a titanium metal substrate. The electrodeposite…