Materials Literature
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The precise manipulation of a propagating wave using phase control is a fundamental building block of optical systems. The wavefront of a light beam propagating across an interface can be modified arbitrarily by introducing abrupt phase changes. We experimentally demonstrated unparalleled wavefront control in a broadb…
The key hurdle to the practical use of as-grown single-walled carbon nanotubes (SWNTs) for high performance nanoelectronics is the unavoidable presence of metallic nanotubes with current synthesis methods. We present a simple approach to convert metallic SWNTs to semiconducting ones in situ to improve device field eff…
Abstract Due to the favorable band offsets, SiC nanoparticles embedded in silica form a very interesting quantum dot (QD) system. It is possible to produce such QDs in a simple oxidation–carbonization–reoxidation process on Si wafers. This could thus enable production of Si based LED integrated into Si logic devices.…
Many optical instruments with dielectric singularities cannot be manufactured directly. Their singularities can be transmuted through optical transformation, and equivalent physical media can be built to perform the same optical behaviors. The transformed physical media are usually anisotropic and inhomogeneous and, t…
The crystal structure of PurL from Thermus thermophilus HB8 (TtPurL; TTHA1519) was determined in complex with an adenine nucleotide, PO(4)(3-) and Mg(2+) at 2.35 Å resolution. TtPurL consists of 29 α-helices and 28 β-strands, and one loop is disordered. TtPurL consists of four domains, A1, A2, B1 and B2, and the struc…
HisC2 from Mycobacterium tuberculosis was overexpressed in M. smegmatis and purified to homogeneity using nickel-nitrilotriacetic acid metal-affinity and gel-filtration chromatography. Diffraction-quality crystals were grown using the hanging-drop vapour-diffusion technique from a condition consisting of 7 mg ml(-1) H…
Carbon nanodiscs are new bottom-up prepared nanomaterials with well-defined diameter and thickness (of 1–2 μm and 20–50 nm, respectively). We investigate their electrochemical performance towards oxidation and reduction of small inorganic molecules as well as biomarkers. We have found that carbon nanodiscs exhibit fas…
Electroplated coatings for reed switches were developed and investigated. The optimal compositions of industrial electrolytes currently used in the mass production of reed switches were given. The pros and cons of the different electroplated coatings, including those containing precious metals and with barrier layers…
Abstract Single crystals of lithium-sodium-tetragermanate, a member of the solid solution series Li2−xNaxGe4O9 with x=0.28, pure and slightly doped with Cr3+ ions (0.03 mol.% and 0.1 mol.%), were grown in ambient atmosphere by the Czochralski technique from stoichiometric melt. The crystals with dimensions up to 20 mm…
Inline IR has been applied to evaluate the scale-up of processes that potentially generate hazardous diborane, hydrazoic acid, methyl chloride, or acetylene in the headspace of reactors. In addition, a new, simplified approach to calibrate the online IR analyzer for the measurement of hydrazoic acid in the gas phase h…
In Streifen: Die Erzeugung definierter Graphennanobänder (GNRs) ist eine Voraussetzung für viele Anwendungen dieses Materials. Ab-initio-Rechnungen zufolge bilden auf Graphen adsorbierte O-Atome unter externer Zugspannung in eine Richtung parallele Epoxyketten, die beim folgenden Zerschneiden durch Sauerstoff GNRs erg…
Defect structures of BaTiO(3) and the like co-doped with variable-valence acceptors and donors are not clear particularly in transition from acceptor domination to donor domination with increasing oxygen activity. We have, thus, examined the electrical conductivity and thermoelectric power of BaTiO(3) co-doped with a…
Molecular variations are incorporated in a triphenylamine-thiophene monomer to direct the polymerization and structure of electro-active polymer electrodes. When methyl groups are inserted at the 4-position of tris(4-(thiophen-2-yl)phenyl)amine, electropolymerization occurs solely at the 5-position resulting in a poly…
An in situ crystallized FCC catalyst with high porosity and high Y-faujasite percentage was successfully synthesized via adding a lab made porosity enlarging agent (PEA) to kaolin clay. The in situ crystallized microspheres (CMS) had a pore volume of 0.462 mL g−1, a specific surface area of 406 m2 g−1, and a Y-faujasi…
The isostructural phases 39R-Ge(0.067)Sb(0.667)Te(0.266) (R3m, a=4.2649(1), c=75.061(2) Å) and 39R-Sn(0.067)Sb(0.667)Te(0.266) (R3m, a=4.2959(1), c=75.392(2) Å) were prepared by quenching stoichiometric melts of the pure elements and subsequent annealing at moderate temperatures. Their structures are comparable to "su…
Byrsonima crassa Niedenzu (Malpighiaceae) is used in Brazilian folk medicine for the treatment of diseases related mainly to gastric ulcers. In a previous study, our group described the gastric protective effect of the methanolic extract from the leaves of B. crassa. The present study was carried out to investigate th…
Abstract By applying a pulsed arc-plasma process, Pt nanoparticles were deposited from a Pt cathode onto CeO2 powders to study their structure and catalytic activity for CO oxidation. Highly dispersed uniform metallic Pt crystallites with the size of 2.6 ± 0.7 nm were obtained. Because of the highly dispersed metallic…
Abstract Using DFT method, the stable adsorption configurations of Cu4 cluster on Cr2O3 (0001) surface were investigated. The regular tetrahedron structure and the planar structures were considered as the initial adsorption configuration of Cu4 cluster, respectively. The adsorption energies of the two structures were…
Abstract Grain-size evolution with increasing annealing time has been investigated in polycrystalline Co2FeSi films. The samples were prepared by sputtering giving differing grain sizes. Large grains were formed after annealing at 500 °C, with grains over 200 nm forming in the L21 phase in a layer-by-layer mode. Furth…
In this paper the concept, design and realization of an integrated laser interferometer are presented. The integrated Twyman–Green-type interferometer is based on micro-optical diffraction gratings in the resonance domain. The fabrication process of these gratings and their assembly in the functional interferometer wi…