Materials Literature
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The evolution in microstructure and local crystallography is described, with emphasis on the behaviour of medium to high stacking fault energy FCC metals deformed at low temperature. This evolution is analysed within a common framework of grain subdivision on different size scales. The largest scale is the macroscopic…
Methods of deforming metals to large strains are reviewed and the process of equal channel angular extrusion is analysed in detail. The development of microstructure during large strain deformation is discussed, and it is concluded that the main criterion for the formation of a sub-micron grain structure is the genera…
Bovine aortic endothelial cells were cultured on surfaces grafted with a temperature-responsive polymer, poly(N-isopropylacrylamide) (PIPAAm), in the presence of serum. Cells adhered, spread, proliferated, and reached confluency as observed on ungrafted tissue culture polystyrene dishes. A decrease in culture temperat…
The nitrogen adsorption isotherm measured at 77 K in the relative pressure range from about 5 × 10 - 7 to 0.988 for a macroporous silica is reported in a tabular form. The isotherm data are in good agreement in the high-pressure range with the reference data published by Gregg and Sing and by Kiselev and Aristov and p…
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…