Materials Literature
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We report a multilayer film of poly(vinyl alcohol) (PVA)-borate complex and chitosan by using a layer-by-layer approach. PVA is an uncharged polymer, but hydroxyl functional groups of PVA can be cross-linked by using borax as a cross-linking agent. As a result electrostatic charges and intra- and interchain cross-link…
Photoresponsive Liganden als Umhüllung machen Metallnanopartikel (NPs) zu „Tinten“ für selbstradierendes „Papier“, indem die lichtinduzierte Assoziation der NPs in lokale Farbwechsel übersetzt wird (siehe Bild). Je nach Ausmaß der Assoziation können vielfarbige Bilder mit nur einer Art von NP-Tinte geschrieben werden.…
A study of ``inverted'' core-shell, $\mathrm{MnO}/\ensuremath{\gamma}\mathrm{\text{\ensuremath{-}}}{\mathrm{Mn}}_{2}{\mathrm{O}}_{3}$, nanoparticles is presented. Crystal and magnetic structures and characteristic sizes have been determined by neutron diffraction for the antiferromagnetic core (MnO) and the ferrimagne…
In this paper, we review the present status of light emitters based on SiGe nanostructures. In order to be commercially valuable, these light emitters should be efficient, fast, operational at room temperature, and, perhaps most important, compatible with the ldquomainstreamrdquo complementary metal-oxide-semiconducto…
The transport properties of oxygen‐ion conducting yttria‐stabilized zirconia (YSZ)—featuring mean grain sizes from a few nm up to the μm regime—were studied with regard to grain‐size effects. Chemically homogeneous, 8.3 mol% YSZ thin films (thickness approximately 400 nm) were processed on single‐crystal sapphire subs…
The development of multidrug resistance (due to drug efflux by P-glycoproteins) is a major drawback with the use of paclitaxel (PTX) in the treatment of cancer. The rationale behind this study is to prepare PTX nanoparticles (NPs) for the reversal of multidrug resistance based on the fact that PTX loaded into NPs is n…
Shear-induced melting and crystallization were investigated by confocal microscopy in concentrated colloidal suspensions of hard-sphere-like particles. Both silica and polymethylmethacrylate suspensions were sheared with a constant rate in either a countertranslating parallel plate shear cell or a counterrotating cone…
A small-angle X-ray scattering (SAXS) set-up has recently been developed at beamline I711 at the MAX II storage ring in Lund (Sweden). An overview of the required modifications is presented here together with a number of application examples. The accessible q range in a SAXS experiment is 0.009-0.3 A(-1) for the stand…
Dense samples of ZrB 2 –20 vol% SiC were successfully fabricated by spark plasma sintering without the use of sintering aids. Oxidation behavior of these samples was characterized by exposing them to 1400°, 1500°, and 1600°C in an ambient atmosphere for 150 min, and by measuring the weight gains of the sample and cruc…
We report a numerical study of quantum transport in zigzag graphene nanoribbons with varying edge-disorder profile. The transport length scales, such as the elastic mean-free paths and the localization lengths, are shown to fluctuate by orders of magnitude depending on the topology of edge irregularities as well as th…
For electrical spin injection and detection of spin-polarized electrons in silicon, we explore highly epitaxial growth of ferromagnetic full-Heusler-alloy Co2FeSi thin films on silicon substrates using low-temperature molecular beam epitaxy (LTMBE). Although in-situ reflection high energy electron diffraction images c…
We study liquid-vapor phase separation under shear via the Shan-Chen lattice Boltzmann model. Besides the rheological characteristics, we analyze the Kelvin-Helmholtz(K-H) instability resulting from the tangential velocity difference of the fluids on two sides of the interface. We discuss also the growth behavior of d…
Silver oxide thin films have potential applications in ultra-high density optical non-volatile memories and in fluorescence imaging. In this paper, the physical properties of silver oxide thin films prepared at room temperature by the pulsed laser deposition (PLD) technique with varying oxygen pressure during growth a…
A graphene bilayer phototransistor (GBL-PT) is proposed and analyzed. The GBL-PT under consideration has the structure of a field-effect transistor with a GBL as the channel sandwiched between the back and the top gates. The positive bias of the back gate creates the conducting source and drain sections in the channel…
We report the first experimental study of continuous sheets of graphene possessing both one-layer and two-layer portions. In a bulk hybrid structure featuring two large-area one-layer and two-layer graphene areas, our measurements in a magnetic field revealed the formation of two independent sets of Landau levels with…
Peanut clusters: Anion templates are used in a facile approach for the synthesis of high-nuclearity silver clusters. The cluster nuclearity can be controlled by adjusting the size of the templating anions and by using different alkynyl ligands. The largest silver alkynyl cluster, which consists of 35 silver(I) centers…
In metamaterials, electric (magnetic) dipoles can be excited by the electric (magnetic) component of the incident light field. Moreover, in the description of bianisotropic metamaterials, cross terms occur, i.e., magnetic dipoles can also be excited by the electric-field component of the incident light and vice versa.…
A straightforward hydrothermal strategy for the controlled synthesis of monodisperse NaLa(MoO 4 ) 2 and NaLa(MoO 4 ) 2:Eu 3+ bipyramid nanocrystals is presented using oleic acid/oleylamine as a mixed surfactant. Deprotonated oleic acid was demonstrated to be the decisive structure-directing agent for the bipyramid nan…
We report a first-principles based study of mesoscopic quantum transport in chemically doped graphene nanoribbons with a width up to 10 nm. The occurrence of quasi-bound states related to boron impurities results in mobility gaps as large as 1 eV, driven by strong electron-hole asymmetrical backscattering phenomena. T…
We study the influence of the spin lattice distortion on the properties of frustrated magnetic systems and consider the applicability of the spin-1/2 frustrated square lattice model to materials lacking tetragonal symmetry. We focus on the case of layered vanadium phosphates AA'VO(PO4)2 (AA' = Pb2, SrZn, BaZn, and BaC…