Materials Literature
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Special enhanced silver mirror coatings were designed and fabricated to minimize the polarization introduced by a three-mirror off-axis high-accuracy telescope. A system diattenuation of approximately 1% in the VIS-NIR was achieved by both reducing the diattenuation from each mirror individually and by balancing the d…
Mg 2 TiO 4 ‐doped Ba 0.60 Sr 0.40 Mg 0.15 Ti 0.85 O 3 (BSTM) thin films with different Mg 2 TiO 4 concentrations were deposited on a polycrystalline alumina substrate via the sol–gel method. With the addition of Mg 2 TiO 4 , MgTiO 3 , MgAl 2 O 4 , and BSTM phases were formed in these composite thin films. The dielectr…
ZnSe immersion gratings (<i>n</i> ~ 2.45) provide the possibility of high-resolution spectroscopy for the near-infrared (NIR) region. Since ZnSe has a lower internal attenuation than other NIR materials, it is most suitable for immersion grating, particularly in short NIR region (0.8 - 1.4 μm). We are developing an…
We report the band-structure changes near Fermi level for single-walled carbon nanotubes (SWNTs) with diameters down to 1nm from the study of soft-x-ray absorption and resonant emission spectroscopy. The observed quantum confinement of SWNTs affects both π and σ bands and bandgap through the rehybridization of π and σ…
A semiclassical kinetic model is developed to simulate the plasmon excitation of nanotubes and the transport of charged particles moving through nanotubes. With the introduction of electron band structure, the analytical expressions of the dielectric function and the energy loss function are obtained for zigzag and ar…
Innenarchitektur: Ein 5 nm großer sphärischer Komplex, in dessen Innenraum 24 Alkylketten ragen, bietet eine hydrophobe Umgebung definierter Größe und Struktur (siehe Bild; Schale blau, Pd gelb, O rot, C dunkelrot, H grau). Der Hohlraum kann Farbstoffmoleküle aufnehmen und solubilisieren, und seine Hydrophobie lässt s…
Well-aligned Cu doped ZnO nanorods were synthesized by simple radio frequency plasma deposition in the absence of extra catalysts. The synthesized nanorods having a typical average diameter of about 60nm, were about 700nm in length and well aligned along the normal direction of the substrate. Magnetic measurements ind…
The 1:1 structural order and B‐site cation order in Pb(Mg 1/3 Nb 2/3 )O 3 ceramics was significantly enhanced by Zr 4+ substituting Nb 5+ according to the chemical formula Pb(Mg 1/3 Zr 2 x /3 Nb 2(1− x )/3 )O 3− x /3 . The enhanced structural and cation order was revealed by both X‐ray diffraction and transmission ele…
Reduktion mit CaH2 überführt den Doppelschichtperowskit Sr3Fe2O7 in die zweibeinige Leiterverbindung Sr3Fe2O5 mit S=2. Dieser Prozess und die Synthese von SrFeO2 eröffnen Perspektiven für die Festkörperchemie und -physik einer Reihe von n-beinigen Leitern Srn+1FenO2n+1. Das Bild illustriert die Strukturänderungen von…
The As-doped p-type (Zn0.93Mn0.07)O layers show a strong dependence of their ferromagnetic properties on the hole conductivity that were controlled through the modification of negative background-charge density by changing the oxygen partial pressure during the initial growth stage before As doping. Curie temperature…
Abstract Finely ground rice husk was used as a filler in two commercial grades of polypropylene (PP) in different amounts. Rice husk powder was chemically treated with dilute hydrochloric acid, dilute sodium hydroxide solution, and dimethyl sulfoxide. The mechanical, thermal, and rheological properties of PP filled wi…
Bi Sc O 3 – Li Sb O 3 – Pb Ti O 3 solid solutions with perovskite structure were prepared by the conventional mixed oxide method. X-ray diffraction showed that a change in symmetry from rhombohedral to tetragonal as the mole fraction of PbTiO3 larger than 62%. In the vicinity of the morphotropic phase boundary, the ce…
Optical properties of implanted Si in a silicon nitride (Si3N4) thin film have been determined with spectroscopic ellipsometry based on the Tauc–Lorentz (TL) model and the Bruggeman effective medium approximation. It is shown that the suppressed dielectric functions of the implanted Si are dominated by the energy tran…
The authors report the electron field emission from a single carbon nanofiber (CNF) over a range of anode to CNF tip separations of 20–5500nm. Our results show that the field enhancement factor γ is associated with the electrode separation (S). The modified Miller equation is a reasonable empirical model to describe t…
Differences in cashmere production and fleece attributes associated with farm of origin, age and sex were quantified for commercial Australian cashmere goat enterprises. From 11 farms in four states, 1147 does and 97 wethers were monitored, representing 1- to 13-year-old goats. Individual clean cashmere production ran…
A K- and Q-band electron spin resonance study, combining two detection modes, on structures composed of Si nanoparticles (∼2nm across) embedded in a SiO2 matrix obtained by annealing of SiO∕SiO2 superstructures unveils the observed principal Si dangling bond signal as solely comprised of the intrinsic Pb(0) and Pb1 Si…
We describe the design and fabrication of nanostructured silver split-ring resonators and demonstrate their application as dichroic sensors for multipurpose visible wavelength molecular spectroscopy. By producing arrays of these identical nanostructures, with critical dimensions of 30–150nm, we demonstrate the control…
Abstract The term homogeneous has been applied to molluscan microstructures that lack a readily discernible microstructure and as a result, it has become rather a ‘dustbin’ term, covering a multitude of unrelated finely crystalline textures. Here we investigate in detail the outer ‘homogeneous’ layer of the lyonsiid b…
We report a structural transformation between the regular wurtzite and the unbuckled wurtzite (hexagonal) structure for ultrathin single-crystalline [0001] ZnO nanowires under uniaxial elongation and compression. Our density functional calculations show that hexagonal structure corresponds to a distinct minimum on the…
Zn 0.97 Co 0.03 O nanocrystalline powders were prepared by sol-gel method with a low annealing temperature of 450°C. The as-synthesized Zn0.97Co0.03O powders were paramagnetic. However, after compaction under a pressure of 94MPa, the Zn0.97Co0.03O pressed powders show a weak room-temperature ferromagnetism embedded in…