Materials Literature
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We grow epitaxial graphene monolayers on Ru(0001) that cover uniformly the substrate over lateral distances larger than several microns. The weakly coupled graphene monolayer is periodically rippled and it shows charge inhomogeneities in the charge distribution. Real space measurements by scanning tunneling spectrosco…
We show that silver(I) hexacyanocobaltate(III), Ag3[Co(CN)6], exhibits positive and negative thermal expansion an order of magnitude greater than that seen in other crystalline materials. This framework material expands along one set of directions at a rate comparable to the most weakly bound solids known. By flexing…
Mononuclear ortho-palladated complexes containing 2-phenylquinoline ligand functionalized with a chiral entity and a biologically active O,O chelated ligand have been synthesized and fully characterized. The evaluation of the liquid crystalline properties of these non-conventional compounds is reported in view of a po…
The crystal structure of the title compound, α-PbTeO(3) (PTO), has been reported previously by Mariolacos [Anz. Oesterr. Akad. Wiss. Math. Naturwiss. Kl. (1969), 106, 128-130], refined on powder data. The current determination at room temperature from data obtained from single crystals grown by the Czochralski method…
The electric field induced nematic order reconstruction is a way to achieve controlled transitions between uniaxial nematic textures with different topologies, hence allowing intrinsic textural bistability. The order reconstruction connects perpendicular nematic director orientations by exchanging two eigenvalues of t…
A homologous series of four-chained silver(I) and zinc(II) metal complexes based on the coordination of two N N′-bidentate ligands pzR2py 2-[3,5-bis(4-alkyloxy)phenyl]pyrazol-1-yl]pyridine (R = C6H4OCnH2n+1, n = 16, 18) have been synthesised. All compounds [M(pzR2py)2][A]m (M = Ag, m = 1, n = 16, 18, (1,2), (3,4), CF3…
The structural properties of single-walled carbon nanotubes (SWCNTs) are evaluated by a new continuum modeling method, called the dynamic continuum modeling method (DCMM). In the DCMM, a repeating cell unit isolated from a SWCNT is represented as an equivalent continuum beam element by using the energy equivalence pri…
Millimeter‐thick symmetric ceramic laminates, designed to possess a specific through‐thickness residual stress profile, were produced by tape casting from blends of alumina, zirconia, and mullite powders. The residual stress profile was checked nondestructively by X‐ray energy‐dispersive diffraction using synchrotron…
Synthesis and characterization of Fe and rare earth (RE) (RE=Eu,Nd) codoped bulk In2O3 oxide are reported. Composites consisting of Fe-doped In2O3 and InREO3 phases were formed, as determined by x-ray diffraction and transmission electron microscopy, with particle sizes of 50–120nm. The composites exhibit superparamag…
Reifenstapel: Die Anordnung ringförmiger Polyoxomolybdatcluster (MC) durch ein starres stabförmiges p-Phenylenbutadiinylen-Oligomer mit Ammoniumseitengruppen (PBn) ergab eine eindimensionale organisch-anorganische Nanostruktur. Dabei handelt es sich höchstwahrscheinlich um ein Polypseudorotaxan, in dem mehrere MC-Ring…
The phase formation, densification behavior, and microstructure development of Sr 2 NaNb 5 O 15 (SNN) ceramics in both 10 wt% acicular Sr 2 KNb 5 O 15 (SKN) seed‐containing and unseeded systems were investigated in this work. SNN ceramics were reactively sintered from SrNb 2 O 6 and NaNbO 3 powders. The results show t…
A versatile hybrid processing method that combines electrostatic deposition of microparticles and subsequent anisotropic plasma etching is described that can generate superhydrophobic engineering surfaces with tunable bimodal roughness and a thin hydrophobic fluorocarbon film. These surfaces exhibit contact angles wit…
Fundamental processes leading to the erosion of hydrocarbon films due to energetic argon ions and hydrogen atoms have been investigated using molecular dynamics simulations. A generic mechanism has been identified for carbon erosion due to energetic (150 eV) argon ions in the presence of sub-eV hydrogen atoms. This su…
Biomaterials have been widely used to prepare synthetic vascular grafts over the past thirty years, but the inherent thrombogenicity of their surface can lead to graft failure. Endothelial progenitor cells (EPC) are circulating premature cells able to differentiate in either myocardial or endothelial cells (EC). The t…
In electron-doped LaMnO3, La is partially substituted by tetravalent Ce, and Mn has a valence between 2 and 3. Mn2+ ions have five localized 3d electrons (half-filled shell) and a spin S*=5∕2. The Mn3+ configuration corresponds to an eg hole in the half-filled shell yielding a total spin S=2. A mean-field slave-boson…
We demonstrate control over heat flow in an N -terminal molecular junction. Using simple model Hamiltonians we show that the heat current through two terminals can be tuned by the temperature and coupling parameters of external gating reservoirs. We discuss two models: A fully harmonic system and a model incorporating…
Results concerning the preparation and characterization of electrochemically deposited (Fe1−xGax∕Fe1−yNiy)n (x=0.1–0.3at.%; y=0.4–0.8at.%) multilayered films and nanowires arrays are reported for the first time. The layers have been deposited successively by changing the electrodeposition potential. The combination of…
Abstract Polypropylene/sawdust composites have been prepared according to a statistical experimental design, with varying sawdust and compatibilizer (maleic anhydride grafted PP) concentrations. To investigate process conditions, composites were first extruded in a twin screw extruder coupled to a Haake torque rheomet…
Electrospinning of sol–gels has been used to produce zirconium‐doped polymer microfibers from zirconyl chloride and poly(vinylpyrollidone) precursors. Calcination of these structures between temperatures of 370° and 930°C resulted in the formation of zirconia nanograined microfibers whose diameters ranged from 1200 to…
The (pseudo)polymorphism of ethinyl estradiol was investigated via extensive crystallization experiments. Four new crystal structures of ethinyl estradiol solvates that resulted from this study are presented. They contain dioxane, nitromethane, ethanol, or dimethylformamide. The crystal structures of the hemihydrate,…