Materials Literature
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Abstract We have performed ab‐initio self‐consistent calculations using the full potential linear augmented plane wave method to investigate the structural and the electronic properties of the boron bismuth III–V compound BBi. Our calculations provide the first available information about the structural and electronic…
Charge-transfer salts of branched-alkyl biferrocenes, (1',1' ''-R2-1,1' '-biferrocene)[Ni(mnt)2] (1a, R = isopropyl; 2a, R = dineopentyl) and (1',1' ''-R2-1,1' '-biferrocene)2[Co(mnt)2]2 (1b, R = isopropyl; 2b, R = dineopentyl), were prepared. Their valence states were investigated using X-ray crystallography and Möss…
Interaction over a distance: Long-range antiferromagnetic interactions between distant copper(II) and silver(II) ions are observed only for triply and singly linked diporphyrins with at least one β–β bond, which underscores the critical importance of this direct bond for antiferromagnetic coupling. These results can b…
The converse electromechanical response in an organic Schottky contact follows a power law dependence S∝Vα of the mechanical strain S versus the applied voltage V, with an exponent α=1.5, in between linear piezoelectricity and quadratic electrostriction. The experimental result is discussed within the frame of a model…
Spin im Quadrat: Bei einem cyanidverbrückten molekularen Quadrat (siehe Bild) wurde ein thermisch induzierter zweistufiger Spin-Crossover beobachtet. Moleküle mit mehr als einem Spin-Crossover-Zentrum eignen sich als Baueinheiten für molekulare Schalter mit mehreren Zuständen.
Abstract Thermoluminescence (TL) characteristics and dosimetric properties of Ba 2 Ca(BO 3 ) 2 phosphor doped with Tb 3+ exposed to gamma‐ray irradiation are reported for the first time. Firstly, the influence of different rare earth dopants, i.e. Dy 3+ , Tb 3+ and Tm 3+ , on TL of Ba 2 Ca(BO 3 ) 2 phosphor is discuss…
The oxygen pressure dependence of magnetic anisotropy in pulse laser deposited manganese ferrite (MnFe2O4) films was investigated. Magnetic anisotropy fields (Ha) are shown to exceed 5kOe when films were processed at oxygen pressures below 5mTorr. Further, it is shown that the magnetically preferred direction of Ha ca…
We have synthesized, using the Gilch polymerization method, a new series of high-brightness, soluble copolymers (POSS-PPV- co -MEHPPV) of poly( p -phenylenevinylene) (PPV) containing side-chain-tethered polyhedral oligomeric silsesquioxane (POSS) pendent units and poly(2-methoxy-5-[2-ethylhexyloxy]-1,4-phenylenevinyle…
The photoinduced charge separation efficiency in porphyrin/TiO2 bilayers has been determined using the time-resolved microwave conductivity (TRMC) technique. Porphyrins investigated are unsubstituted meso-tetraphenylporphyrin (TPP) and meso-tetra(4-ethylphenyl)porphyrin (TEPP). TEPP/TiO2 bilayers exhibit a charge sepa…
Schon wenige isolierte Au3+-Ionen (0.02 pro nm2) auf einer ZrO2-Oberfläche genügen, um hohe katalytische Aktivitäten bei der selektiven Hydrierung von 1,3-Butadien zu erzielen. Katalytischer Umsatz und massebezogene Aktivität von metallischen Goldnanopartikeln werden um eine bzw. zwei Größenordnungen übertroffen. Zur…
The effect on solar cell performance of planar converters containing quantum dots (QDs) as wavelength-shifting entities on top of multicrystalline silicon cells was investigated by means of model studies with varying incident spectra. These included global, direct, and diffuse spectra with Air Mass (AM) values ranging…
The major ampullate fiber of both Nephila clavipes and Argiope aurantia is composed of two different proteins, MaSp1 and MaSp2. Each of these proteins has a highly conserved pattern of silk-associated amino acid motifs. The GPGXX motif is the only source of proline and is unique to MaSp2. On the basis of the percent o…
Colloidal, monodisperse CdSe nanocrystals were homogeneously dispersed in an ionic liquid and investigated by means of cyclic voltammetry. Almost all known defect states in semiconductor nanocrystal were quantitatively measured with this nonoptical method (including nonradiative defect states). Variation of the illumi…
High-temperature hydrolysis of Zn(II) and Mn(II) alkoxides in a high boiling point solvent in the presence of surfactants was used to prepare surfactant-coated Zn(1-x)Mn(x)O nanocrystals with average size of 5.5 nm and x = 0.04 +/- 0.03. The magnetic properties of the nanocrystals were measured both for isolated parti…
Systems of highly degenerate ordered or frozen state may exhibit inverse melting (reversible crystallization upon heating) or inverse freezing (reversible glass transition upon heating). This phenomenon is reviewed, and a list of experimental demonstrations and theoretical models is presented. A simple spin model for…
We redraw, using state-of-the-art methods for free-energy calculations, the phase diagrams of two reference models for the liquid state: the Gaussian and inverse-power-law repulsive potentials. Notwithstanding the different behaviors of the two potentials for vanishing interparticle distances, their thermodynamic prop…
Direct diffraction evidence for structurally frustrated relaxor ferroelectric behavior in the form of one-dimensionally correlated, off-center displacements of Ti ions within the $\mathrm{Ti}{\mathrm{O}}_{6}$ octahedra of $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$ (CCTO) has been obtained. When c…
Abstract Die Vorteile heterogener Single‐Site‐Katalysatoren (single‐site heterogeneous catalysts, SSHCs) sind vielfältig. Sie ermöglichen es – sowohl experimentell als auch mit Computermethoden – den Mechanismus und die Kinetik eines katalytischen Umsatzes zu bestimmen, und sie machen die Energetik von Intermediaten e…
The field emission properties of individual multiwalled carbon nanotubes have been measured simultaneously in correlation to the emitter images and their real work functions at tips by the in situ transmission electron microscopy method. The field emission of a single nanotube still follows the Fowler-Nordheim law. Th…
The chemical sensitivity of electronic transport in carbon nanotubes under the physisorption of molecular species is investigated using a tight-binding scheme, parametrized by first-principles calculations. Such a computational method enables tackling of the complex electronic properties of chemically grafted conducti…