Materials Literature
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Using a first-principles band-structure method and a special quasirandom structure (SQS) approach, we systematically calculate the band gap bowing parameters and \emph{p}-type doping properties of (Zn, Mg, Be)O related random ternary and quaternary alloys. We show that the bowing parameters for ZnBeO and MgBeO alloys…
Tetragonal ferroelectric/ferroelectric BaTiO(3)/PbTiO(3) superlattice under uniaxial tensile stress along the c axis is investigated from first principles. We show that the calculated ideal tensile strength is 6.85 GPa and that the superlattice under the loading of uniaxial tensile stress becomes soft along the nonpol…
Big, bigger, biggest: Polyoxoniobate anions [HNb27O76]16− and [H10Nb31O92(CO3)]23− incorporate pentagonal Nb(Nb)5 building blocks; the central Nb ion is seven-coordinate within the clusters. The Nb27 species was observed using ESI-MS, thus demonstrating some solution stability; the Nb31 species is chiral and incorpora…
Für die Detektion von Gammastrahlen wurde ein nicht-szintillierender organischer Sensor aus einem Blend von Poly(olefinsulfon) und Kohlenstoff-Nanoröhren entwickelt (siehe Bild). Die Polymere können nach der Polymerisation mit Pyren- und Bismut-Einheiten funktionalisiert werden (was durch Copolymerisation nicht geling…
Mut zur Lücke: Dotieren mit nichtmagnetischen Scandiumionen verringert die Bildungsenergie von Al-Leerstellen in Aluminiumnitrid. Diese Leerstellen sind der Grund für den Raumtemperatur- Ferromagnetismus in eindimensional angeordneten hexagonalen Nanoprismen von AlN:Sc (siehe Mikrograph), wie auch First-Principles-Rec…
FAD synthetase from Corynebacterium ammoniagenes (CaFADS), a prokaryotic bifunctional enzyme that catalyses the phosphorylation of riboflavin as well as the adenylylation of FMN, has been crystallized using the hanging-drop vapour-diffusion method at 277 K. Diffraction-quality cubic crystals of native and selenomethio…
In bacteria and plants, dihydrodipicolinate synthase (DHDPS) plays a key role in the (S)-lysine biosynthesis pathway. DHDPS catalyzes the first step of the condensation of (S)-aspartate-beta-semialdehyde and pyruvate to form an unstable compound, (4S)-4-hydroxy-2,3,4,5-tetrahydro-(2S)-dipicolinic acid. The activity of…
Abstract A general methodology for the synthesis of multifunctional AB 2 , AB 3 , AB 4 , and AB 5 dendritic wedges is described based on an orthogonal protection strategy. Asymmetric polyamide dendrons that possess N‐terminal cysteine residues at the periphery were quantitatively functionalized with C‐terminal thioest…
The use of shape memory alloy (SMA) actuators in smart structures is increasing significantly especially in the field of Micro-Electro-Mechanical Systems (MEMS) due to their unique properties. In this work wavelength dependent remote power supply for SMA is presented to avoid electrical cables from the working area of…
The purpose of this study is to prepare and characterize stable oil-in-water emulsions containing droplets coated with silk fibroin.Silk fibroin, a native edible fibrous protein originating from silkworm cocoons, was used to prepare 10 % (by mass) corn oil-in-water emulsions at ambient temperature (pH=7.0, 10 mM phosp…
Abstract In this study, continuous mullite (3Al 2 O 3 ·2SiO 2 ) nanofibers were fabricated by sol–gel and electrospinning techniques and calcined at high temperatures to obtain pure ceramic mullite nanofibers. Detail structural characterizations suggested that the productive rate of electrospun mullite nanofibers were…
Verbrennen einer Ethanollösung von Vanadyl(IV)-acetylacetonat in einem Becherglas ergibt monoklines VO2 [VO2(M)], ein bisher teures Oxid, in einer bequemen Laborsynthese. Mithilfe von dynamischer Differenzkalorimetrie (DSC) ließen sich konsistente Heiz- und Kühlkurven (siehe Bild) für 50 reversible Übergänge zwischen…
Monodispersed NaEuF4 submicron disks assembled from nanocrystals exhibit prominent red emission under the excitation of UV light, low-voltage electron beam, and commercial blue light-emitting diode. These disks would have potential applications in solid-state lighting, field emission displays, etc.
The condensation of ammonium and glutamate into glutamine catalyzed by glutamine synthetase (GS) is a fundamental step in nitrogen metabolism in all kingdoms of life. In plants, this is preceded by the reduction of inorganic nitrogen to an ammonium ion and therefore effectively articulates nitrogen fixation and metabo…
Abstract This paper reports the properties of highly oriented nanocomposite tapes based on isotactic PP and needle‐like sepiolite nanoclay, obtained by a solid state drawing process. The intrinsic 1D character of sepiolite allows its exploitation in 1D objects, such as oriented polymer fibres and tapes, where it can b…
Abstract Highly compatible thermoplastic/elastomer blends were used to prepare thermoplastic vulcanizates (TPVs) with refined morphologies and improved mechanical properties. Copolymers of atactic poly(propylene) (aPP) and 5‐ethylidene‐2‐norbornene (ENB) (aPP‐ co ‐ENB) were prepared via metallocene catalysis. Blends o…
The eta(2)-C,C-acetylenedithiolate (acdt2-) complex K[(triphos)Co(acdt)], K-5, {triphos = 1,1,1-tris(diphenylphosphinomethyl)ethane} was obtained by consecutive removal of S-protection groups in [(triphos)Co(1)]PF6, 3-PF6 (1 = 1-Trimethylsilyl-7-phenyl-3,6-dithiahept-4-ine). Reaction of K-5 with selected Pt(II) salts…
The weak mechanical properties of wood in tension perpendicular to the grain are often the origin of catastrophic brittle failure. In order to enhance the tension strength perpendicular to the grain and achieve a more ductile failure, flax fiber and glass fiber-reinforced polymer (FRP) composites were used to strength…
Lanthanide cations have advantageous luminescence properties in the visible and in the near-infrared, such as high resistance to photobleaching which is a desirable property allowing long exposure of lanthanide compounds to excitation light without loss of luminescence intensity, and sharp emission bands whose wavelen…
A fruitful endeavor: Bent-core or banana mesogens may form chiral liquid-crystalline phases even though the molecules themselves are achiral. In the examples provided, short-range orientational and positional order alone caused the formation of chiral isotropic liquids from achiral molecules (see AFM image of nanofila…