Materials Literature
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Local compositions and structures of ${\text{Zn}}_{1\ensuremath{-}x}{\text{Mg}}_{x}\text{O}$ alloys have been investigated by Raman and solid-state $^{67}\text{Z}\text{n}/^{25}\text{M}\text{g}$ nuclear-magnetic-resonance (NMR) spectroscopies and by neutron pair-distribution-function (PDF) analyses. The ${E}_{2}^{\text…
Considerable improvement in the impact toughness of an annealed polypropylene (PP) nanocomposite containing CaCO 3 nanoparticles was achieved and its toughening mechanism was investigated. The nanocomposite was prepared by melt-blending PP and CaCO 3 nanoparticles in a batch mixer. Injection-modeled impact and tensile…
Small silver clusters that form with short oligonucleotides are distinguished by their strong fluorescence. Previous work showed that red- and blue/green-emitting species form with the cytosine oligonucleotide dC 12 . To understand how the bases and base sequence influence cluster formation, the blue/green-emitting cl…
The present work demonstrates that uniform and highly ordered arrays of TiO(2)-WO(3) nanotubes can be grown by anodization of Ti alloys in an ethylene glycol/fluoride based electrolyte under selected electrochemical conditions. These aligned mixed oxide nanotube structures are highly suitable for enhanced electrochrom…
In the present study, the red-light absorbing platinum(II) tetraphenyltetrabenzoporphyrin (PtTPBP) was used as a triplet sensitizer in conjunction with two distinct iodophenyl-bearing BODIPY derivatives independently serving as triplet acceptors/annihilators poised for photon upconversion based on triplet-triplet anni…
First-principles calculations within the local spin-density approximation reveal half metallicity in zigzag boron nitride nanoribbons (ZBNNRs). When the B edge, but not the N edge, of the ZBNNR is passivated, despite being a pure $sp$-electron system, the ribbon shows a giant spin splitting. The electrons at the Fermi…
The synthesis process and crystal structure evolution for a family of stoichiometric layered rare-earth hydroxides with general formula Ln(8)(OH)(20)Cl(4) x nH(2)O (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Y; n approximately 6-7) are described. Synthesis was accomplished through homogeneous precipitation of LnCl(3…
The absolute brightness of fluorescent particles, such as dye-containing nano- and microspheres or quantum dots, is a critical design parameter for many applications relying on fluorescence detection. The absolute brightness, defined as the ratio of radiant intensity of emission to illumination intensity of excitation…
In this paper, we report on measurement of the first experimental L III (2P 3/2 ) subshell absorption jump ratio and jump factor value which were derived from new mass attenuation coefficients measured at the upper and lower energy branches of the L III absorption edge using an energy dispersive x-ray fluorescence (ED…
Using the ab initio VASP-PAW method with the generalized gradient approximation, the magnetic behavior of wurtzite-like beryllium oxide ( BeO ) without magnetic impurities has been predicted. Our results indicate the transformation of non-magnetic insulator BeO into magnetic half-metal at the substitution of oxygen at…
Polyisobutylene (PIB) is a vinyl polymer that is made from the monomer isobutylene by cationic polymerization. PIB has unique properties: very low air, moisture, and gas permeability, good thermal and oxidative stability, chemical resistance, and high tack in adhesive formulations. PIB is a colorless to light-yellow,…
D. HOWELL1 ∗ AND L. NASDALA2 1 Department of Earth Sciences, University College London, Gower St., London WC1E 6BT, UK. 2 Institut für Mineralogie und Kristallographie, Universität Wien, Althanstra...
Aus Dendronen und Cyclodextrinen entstehen durch kooperative Selbstorganisation Nanoröhren, die sich anschließend zu Nanoröhren-Nanopartikel-Hybriden umsetzen lassen (siehe Bild). Die Nanoröhren können auch Proteine nachweisen, indem sie diese spezifisch an ihre Oberfläche binden. Dieser Ansatz hat einiges Potenzial z…
It is normally assumed that a commercial gaseous nitrogen cold-stream provides a sample environment near 100 K and that the force of the cold-stream does not induce movement in the sample. As might be expected, the reality is much more complex. Here, an investigation of one cold-stream, starting with the temperature p…
Oxygen partial pressure (PO2) in pulsed laser deposition significantly influences the composition, microstructure, and electrical properties of epitaxial misfit strain-relieved 450nm ⟨001⟩ oriented epitaxial (K0.44,Na0.52,Li0.04)(Nb0.84,Ta0.10,Sb0.06)O3 thin films on SrRuO3 coated SrTiO3. Films deposited at 400mTorr e…
Abstract The Raman spectrum of the grossular garnet Ca 3 Al 2 Si 3 O 12 has been simulated with the periodic ab initio CRYSTAL code by adopting an all‐electron Gaussian‐type basis set and the B3LYP Hamiltonian. The wavenumbers of the 25 Raman active modes (3 of A 1 g , 8 of E g and 14 of F 2 g symmetry) are in excelle…
Some applications such as ultrafast detectors or high efficiency photovoltaics require absorption by thin films. However, close to the bandgap, silicon absorbs very poorly. In this letter, we show that the absorption of a 100 nm slab can be as high as 50% in the range of wavelengths 700–830 nm when using a periodic st…
The instanton approach to the in-gap fluctuation states is applied to the spectrum of biased bilayer graphene. It is shown that the density of states falls off with energy measured from the band edge as $\ensuremath{\nu}(ϵ)\ensuremath{\propto}\text{exp}(\ensuremath{-}{|ϵ/{ϵ}_{t}|}^{3/2})$, where the characteristic tai…
Polymer Schottky diodes using p-type poly(3,4-ethylenedioxythiophene:poly (styrenesulfonate) (PEDOT:PSS) doped with various concentrations of n-type TiO2 nanoparticles have been fabricated. Although Al/PEDOT:PSS/Au Schottky diode does not show a clear diode characteristics, the Al∕TiO2-PEDOT:PSS/Au Schottky diode exhi…
This paper investigates the free vibration of multi-walled carbon nanotubes (MWCNTs) with simply supported ends. Based on the nonlocal elasticity theory which allows the effects of small length scale and the more refined van der Waals (vdW) interaction formulas, the equation of motion is first derived and then solved…