Materials Literature
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Mit einer Superaustausch-Wechselwirkung über das freie Elektronenpaar des zentralen Stickstoffatoms von 1 läßt sich die Existenz eines Dublett-Grundzustands erklären. Zwei Spins der Aminoxyl-Radikalzentren koppeln antiferromagnetisch, und ein Spin bleibt unverändert. Dieser Vorschlag wird durch ESR-spektroskopische un…
The inverse scattering approach presented here enables the calculation of estimates of top and bottom line width values, sidewall angle, corner rounding, the heights from top-down SEM images or line scans. It also represents a significant step in solving the accuracy problem that plagues CD SEM measurements today. A c…
Ein fünffach koordiniertes Chloridion ist wahrscheinlich das Templat bei der Selbstorganisation eines fünfzehnkernigen Europium(III)-Komplexes. Dieser Cluster (siehe Bild) wurde durch Umsetzung von Europium(III)-perchlorat mit Tyrosin bei pH≈6 hergestellt. Die Einkristall-Röntgenstrukturanalyse zeigt eine neue Struktu…
A superexchange interaction through the lone pair of electrons on the central nitrogen atom in 1 is invoked to explain the existence of a doublet ground state; two spins on the aminoxyl radical centers couple antiferromagnetically, and one spin remains intact. This proposal is supported by EPR spectroscopic and magnet…
We report the synthesis of dense and uniform arrays of well-aligned carbon nanotubes on titanium substrates over large areas, in which all the tubes are simultaneously and completely filled with single crystals of titanium carbide. The carbon nanotubes were synthesized by thermal chemical vapor deposition of ethylene…
Pronounced dendritic effects are shown by the title compound 1 in the recognition of Cl− and Br−—this is shown by the comparison with a mononuclear compound with one dendrimer arm and a trinuclear compound with a tripodal dendrimer branch. Thus, 1 differs distinctly from 24-ferrocene dendrimers of comparable topology.
The first modified analogue of the AII3[BIII(CN)6]2⋅x H2O type of Prussian-Blue, the title compound, has a three-dimensional network structure extended by CrIII-CN-MnII linkages, which is based on a defective cubane unit comprising three Cr and four Mn ions (see structure), and shows ferrimagnetic ordering below 69 K.
Scatterometry is a one of the few types of metrology that has true in-situ potential for deep submicron CD and profile analysis. To date, commercial prototypes have been used to establish scatterometry based on single wavelength, multiple incident angle inspection. We extend this idea by deploying specular spectroscop…
Thermoreversible gels of poly(vinyl alcohol)/Congo red in aqueous solutions have been studied by dynamic light scattering. Below ${T}_{gel}(\ensuremath{\approx}43\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$, a speckle pattern appeared, while it disappeared for $T>{T}_{gel}$. This indicates that nonergodicity obs…
We have grown epitaxial La2/3Sr1/3MnO3 (LSMO) and La2/3Ba1/3MnO3 (LBMO) thin films as well as La2/3Ba1/3MnO3/SrTiO3 heterostructures by pulsed-laser deposition. The microstructure of the films was analyzed by x-ray diffraction and transmission electron microscopy. A significant effect of strain due to lattice mismatch…
Thermally induced threefold infrared-to-visible upconversion emission enhancement in Er3+/Yb3+-codoped Ga2S3:La2O3 chalcogenide glasses excited at 1.064 μm is reported. The times three upconversion efficiency enhancement was achieved by heating the sample in the temperature range of 23–155 °C, and is assigned to the t…
Epitaxial thin films of ordered double-perovskite Sr2FeMoO6−y are deposited on (001) SrTiO3 substrates by pulsed-laser deposition using a two step growth process. Selection of growth conditions is found to lead to either highly conductive metallic thin films (residual resistivity of about 1 μΩ cm) or semiconducting fi…
Nanodiamond powder was annealed at each of the following temperatures: 300, 600, 800, 1000, and 1150 °C, for an hour in flowing argon ambient. The variations of x-ray diffraction patterns and Raman spectra of the powder with different annealing temperatures were studied. While being annealed at temperatures higher tha…
The effect of an external electric field F on the excitonic photoluminescence (PL) spectra of a symmetric coupled double quantum well (DQW) is investigated both theoretically and experimentally. We show that the variational method in a two-particle electron-hole wave function approximation gives a good agreement with…
Eine schnelle Bestimmung von Bindungsaktivität direkt aus Mischungen potentieller Liganden ist mit der hier beschriebenen NMR-Methode möglich, bei der der Sättigungstransfer auf kurzzeitig an ein Protein gebundene Moleküle genutzt wird. Zusätzlich läßt sich das Bindungsepitop sehr einfach ermitteln. Hohe Empfindlichke…
A five-coordinate chloride ion is believed to template the assembly of a pentadecanuclear lanthanide complex of europium(III). This cluster (see picture) has been prepared by coordination of europium(III) perchlorate with tyrosine at about pH 6. Single crystal X-ray analysis established an unprecedented structure in w…
There are few investigations of the influence of filler dispersion on the thermal diffusivity of carbon black rubber compounds. In this article, experimental results of a cured styrene–butadiene rubber (SBR) compound are presented in the range of temperatures between 210 and 350 K at four levels of dispersion obtained…
Polyacrylonitrile (PAN) polymers were prepared by inclusion polymerization of the monomer using various molar equivalents of β-cyclodextrin (β-CD). Stereoregular (isotactic, atactic and syndiotactic) distributions of the prepared PAN polymers were determined from terminal model Bernoullian statistics using 13C-NMR dat…
From a survey of the literature on grafting free radical polymerization from solid surfaces we suggest kinetic schemes for the process. The system of differential equations in partial derivatives including the diffusion equation based on the classical theory of free radical polymerization and the assumption that surfa…
We report on the synthesis, kinetics of proteolysis by trypsin, and morphological characterization of a novel lipidated decapeptide that spontaneously self-assembles in aqueous solutions into 0.5 μm diameter hollow tubules and helices that range in length from tens to hundreds of micrometers depending on formation con…