Materials Literature
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Außen Spin, innen Spin: Die quantitative Selbstorganisation eines Liganden mit Verdazylradikal-Kern und [Pd(bpy)(NO3)2] (bpy=2,2′-Bipyridyl) führt zu einem M6L4-Spinkäfig, dessen Innenraum von Spinzentren umschlossen ist. Der Einschluss eines Radikals in diesen Hohlraum induziert Spin-Spin-Wechselwirkungen zwischen Wi…
The optical properties of zigzag carbon nanotubes in magnetic fields are analyzed. Using a tight-binding model with nearest-neighbor interactions, general expressions are computed for the diagonal and off-diagonal elements of the frequency dependent susceptibility in the presence of an axial magnetic field. The off-di…
Abstract Elastic constants of soft sphere systems, interacting through n ‐inverse‐power potential and exhibiting aperiodicity, caused by the size dispersion of the spheres, are determined at zero temperature by computer simulations. It is shown that, at a fixed number density of the spheres, the Poisson's ratio, as we…
This study focuses on the removal of trapped D from thick codeposits on JET divertor tiles via thermo-oxidation. The tiles were removed from the JET Mark II Gas Box divertor after the 1998–2001 campaign. These codeposits have Be concentrations of up to ∼60% Be/(Be + C) and their thicknesses range from 10 to 270 µm. La…
We present Raman scattering results on crystalline Si 1- x Ge x nanowires (0 < x < 1) grown by the vapor−liquid−solid growth mechanism using chemical vapor deposition. Typical nanowire diameters and lengths were in the range 80−110 nm and 15−40 μm, respectively. Three strong Raman bands were observed and identified as…
High Resolution Image Download MS PowerPoint Slide Au nanoparticles deposited on titania films, where two nanophases of different stoichiometry and defectivity are co-present, were imaged on the same spot by scanning tunneling microscopy. The observed sizes are rather dissimilar as a consequence of the different mobil…
The effects of bond covalency on the chemical bonding nature and lattice stability of ferroelectric bismuth-based transition-metal oxides have been investigated systematically through comparative X-ray absorption spectroscopic studies for several Aurivillius-structured materials and their chemically reduced derivative…
Next generation of infra-red astronomical instrumentation for space telescopes as well as ground-based extremely large telescopes requires MOEMS devices with remote control capability and cryogenic operation, including programmable multi-slit masks for multi-object spectroscopy (MOS). For the complete testing of these…
In this work we present a new technique in order to create antireflective surfaces with the help of statistical nanostructures on fused silica. A specific plasma etching process was found to serve this purpose, as thereby nanostructures are created through self-masking. Under specific etching conditions the micro-cont…
We develop a field theoretical treatment of a model of interacting Brownian particles. We pay particular attention to the requirement of time reversal invariance and the fluctuation-dissipation relationship (FDR). The method used is a modified version of the auxiliary field method due originally to Andreanov, Biroli a…
Solvents and ions entrapped in a cellulose matrix during regeneration process have a significant effect on the performance and durability of electroactive paper actuators made using regenerated cellulose. This article describes a simple approach to remove solvents and Li + ions from the regenerated cellulose films by…
Hexokinase is the first enzyme in the glycolytic pathway that catalyzes the transfer of a phosphoryl group from ATP to glucose to form glucose-6-phosphate and ADP. Two yeast hexokinase isozymes are known, namely PI and PII. Here we redetermined the crystal structure of yeast hexokinase PI from Saccharomyces cerevisiae…
Alder and Wainwright discovered the slow power decay ~t(-d/2) (d is dimension) of the velocity autocorrelation function in moderately dense hard-sphere fluids using the event-driven molecular dynamics simulations. In the two-dimensional (2D) case, the diffusion coefficient derived using the time correlation expression…
Novel silver(I) alkynyl cluster complexes ([Ag5(bpy)4(C [triple bond] CBu(t))2](3+), [Ag8(bpy)6(C [triple bond] CBu(t))4](4+), and [Ag 12(bpy)4(C [triple bond] CBu(t))6(CF3CO2)6]) have been synthesized by reacting soluble polymeric precursors with bipyridine ligands, and control of the nuclearity can be achieved by va…
Mitochondrial NAD(+)-specific isocitrate dehydrogenases (IDHs) are key regulators of flux through biosynthetic and oxidative pathways in response to cellular energy levels. Here we present the first structures of a eukaryotic member of this enzyme family, the allosteric, hetero-octameric, NAD(+)-specific IDH from yeas…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPyridyl-Functionalized and Water-Soluble Carbon Nano Onions: First Supramolecular Complexes of Carbon Nano OnionsAmit Palkar†, Amar Kumbhar‡, Andreas J. Athans†, and Luis Echegoyen*†View Author Information Department of Chemistry, 459 H.L. Hunter Chemistry Laboratory,…
A linear-scaling implementation of the Gaussian and finite-element Coulomb (GFC) method is presented for the rapid computation of the electronic Coulomb potential. The current work utilizes the fast multipole method (FMM) for the evaluation of the Poisson equation boundary condition. The FMM affords significant saving…
Tuberculosis (TB) remains the leading cause of mortality due to a single bacterial pathogen, Mycobacterium tuberculosis. The reemergence of TB as a potential public health threat, the high susceptibility of human immunodeficiency virus-infected persons to the disease, the proliferation of multi-drug-resistant strains…
The stability, structural, and electronic properties of various structural models of the polar MgO(111) surface have been investigated using density functional theory in combination with a thermodynamic formalism. The most stable phase is the O-terminated octopolar structure under the oxygen-rich regime, which is almo…
Strontium titanate modified with praseodymium was investigated by means of a combination of synchrotron x-ray diffraction and thermal analysis at high and low temperatures. The x-ray diffraction data obtained at room temperature revealed a breakdown of the cubic symmetry via the (002)/(200) split peaks. Thus, both the…