Materials Literature
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In this paper we study numerically and experimentally the possibility of using metallic photonic crystals (PC's) of different geometries (log-piles, direct and inverse opals) as visible light sources. It is found that by tuning geometrical parameters of a direct opal PC one can achieve substantial reduction of the emi…
Abstract The magnetic compensation and magnetostriction properties in Fe‐doped CoCr2O4 samples have been investigated. Structural and magnetic measurements imply that the doped Fe3+ ions initially occupy the B1 (Cr) sites when x < 0.1, and then mainly take the A (Co) sites. This behaviour results in a role conversion…
We have studied the dependence of metal oxide properties in molecular dynamics (MD) simulations on the polarizability of oxygen ions. We present studies of both liquid and crystalline structures of silica (SiO(2)), magnesia (MgO) and alumina (Al(2)O(3)). For each of the three oxides, two separately optimized sets of f…
The phase behaviour of colloidal dispersions is interesting for fundamental reasons and for technological applications such as photonic crystals and electronic paper. Sedimentation, which in everyday life is relevant from blood analysis to the shelf life of paint, is a means to determine phase boundaries by observing…
The effect of the film thickness and temperature on structural phase transformations in infinite films of bcc zirconium with (001) crystallographic orientation is studied by the molecular dynamics method with a many-body potential of interatomic interaction obtained within the embedded atom model. It is shown that the…
One of the solutions enabling performance progress, which can overcome the downsizing limit in silicon technology, is the integration of different functional optoelectronic devices within a single chip. Silicon with its indirect band gap has poor optical properties, which is its main drawback. Therefore, a different m…
We show that thermally evaporated lead (Pb) preserves the electronic properties of organic monolayers on Si and the surface passivation of the Si surface itself. The obtained current-voltage characteristics are in accordance with results from the well-established hanging mercury drop method and preserve both the molec…
When speed is of the essence: After photoisomerization to its metastable cis form, an azo dye must undergo fast thermal isomerization back to the trans form to be suitable for real-time information transmission. The azopyrimidine shown has a relaxation time (τ) of just 40 ns under physiological conditions, as well as…
The synthesis and characterization of a highly porous triptycene-derived covalent organic framework (TDCOF-5) and its performance in small gas storage are reported. TDCOF-5 crystallizes into a 2D mesoporous network that contains accessible boron sites, exhibits high surface area (SALang = 3832 m2 g−1), and high gas up…
We review transport experiments on graphene quantum dots and narrow graphene constrictions. In a quantum dot, electrons are confined in all lateral dimensions, offering the possibility for detailed investigation and controlled manipulation of individual quantum systems. The recently isolated two-dimensional carbon all…
Soluble and porous: Soluble conjugated microporous polymers (SCMPs) can be prepared by synthesizing discrete hyperbranched molecules. The materials can be cast from solution as thin films (see picture), suggesting a range of processing options that are not available for insoluble CMP networks. Soluble, conjugated dend…
A hexanuclear dysprosium(III) compound constructed by two Dy3 triangles in an edge-to-edge arrangement perfectly retains a nonmagnetic ground state and single-molecular-magnet behavior. Such an arrangement and the strong couplings over a μ4-O2− ion stabilize a similar arrangement of toroidal moments in the ground stat…
A novel itaconic acid (IA) based epoxy resin with curable double bonds (EIA) was synthesized by the esterification reaction between IA and epichlorohydrin (ECH). Its chemical structure was confirmed in detail by FT-IR, 1H-NMR and ESI-ION TRAP MS before being cured by methyl hexahydrophthalic anhydride (MHHPA). In orde…
Ab initio calculations have been performed to study the geometry and electronic structure of boron (B) and nitrogen (N) doped graphene sheets. The effect of doping has been investigated by varying the concentrations of dopants from 2% (one atom of the dopant in 50 host atoms) to 12% (six dopant atoms in 50 atoms host…
Time-resolved fluorescence measurements of graphene oxide in water show multiexponential decay kinetics ranging from 1 ps to 2 ns. Electron-hole recombination from the bottom of the conduction band and nearby localized states to wide-range valance band is suggested as origin of the fluorescence. Excitation wavelength…
In this review, we discuss the phenomenon of complementary macropore incorporation into mesoporous and/or microporous solids in order to enhance their catalytic performance in fuels and chemicals synthesis.
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This paper describes the effects and the accelerated ageing of polymer, ceramic and glas insulators under artificial tropical climate. A comparison of the surface leakage current of the polymer insulator with a ceramic and a glass insulator can be known if operated in tropical climatic environment.The methods used wer…
Surface plasmon resonance, ellipsometry, and the quartz crystal microbalance are surface-sensitive techniques that provide valuable information of optical and mechanical properties of interfaces. They all are considered to be macroscopic techniques in the sense that they supply global parameters-such as refractive ind…
According to Faraday’s law, when a conductor cuts magnetic eld lines, a voltage is induced across theconductor.Thesynchronousgeneratorusesthisphenomenontoproduceathree-phasevoltage. AsimpleschematicofthegeneratorisshowninFigure8.1andamoredetailedanalysisofthe machineisgiveninChapter12.Thegeneratorconsistsofanouterfra…