Materials Literature
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A technique for the determination of the total electron emission yield (TEEY) of insulators or insulated conductors, due to low energy electron irradiation is described. It is based on the measurement of the surface potential variation induced by a pulsed electron beam with the help of a high-sensitivity Kelvin probe.…
Application of the McMurry reaction in the synthesis of thermally stable photochromic dihetarylethenes is described. Hetaryl rings in the target molecules are connected to the double bond of the cycloalkenes or heterocycles formed upon the McMurry cyclization.
The electrical resistivity $({\ensuremath{\rho}}_{xx})$ and Hall resistivity $({\ensuremath{\rho}}_{xy})$ of ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ have been measured over a wide fluorine-doping range $0\ensuremath{\le}x\ensuremath{\le}0.14$ using 60 T pulsed magnets. While the superconducting phase diagr…
Abstract Cotton fabric was exposed to an atmospheric pressure glow discharge (APGD) ignited by high voltage and helium. Ultrasonic atomization of an aqueous sericin solution injected as an aerosol into the APGD zone gave rise to the rapid deposition of a functionalized plasma polymer film. Sericin coating onto the cot…
Polyphenylenes (PPs) with NH 2 side groups, namely, PFluNH 2 and PPhNH 2, were synthesized by the Pd-complex-catalyzed reaction of 2,5-dibromoaniline with 9,9-dihexylfluorene-2,7-diboronic acid bis(1,3-propanediol) ester and 2,6-dioctyloxybenzene-1,4-diboronic acid. The reaction of PFluNH 2 and PPhNH 2 with 1-alkyl-1′…
Abstract Bei der Lichtabsorption heizen sich Metallnanopartikel auf. Dadurch erhöht sich auch die Temperatur in ihrer Umgebung. Dieses Phänomen lässt sich nutzen, um in einem molekularen System, das an der Nanopartikeloberfläche verankert ist, selektiv Bindungsbrüche herbeizuführen (siehe Bild). Der Prozess könnte zu…
In this paper, dielectric properties of Ni x Mn 0.4-x Zn 0.6 Fe 2 O 4 ferrites with x varying from 0.05 to 0.35 prepared by the citrate precursor method have been investigated as a function of frequency, temperature, composition, and sintering temperature. A decrease in the dielectric constant is observed with the inc…
Abstract Static longitudinal polarizabilities (α) and second hyperpolarizabilities (γ) of model H 2 chains have been calculated at different ab initio levels to address the performance of the recently proposed spin‐component‐scaled MP2 (SCS‐MP2) method (Grimme, J. Chem Phys 2003, 118, 9095). For both α and γ, the SCS‐…
The spectroscopic properties of a series of chalcogenide apatite phosphors, pure and Ce-doped Sr 10 (PO 4 ) 6 S, prepared by a high-temperature solid-state reaction technique, were investigated at different temperatures. The pure Sr 10 (PO 4 ) 6 S powder shows a broad blue emission peaking at 472 nm (2.63 eV), which r…
The crystal structure of the single-component molecular metal [Au(tmdt)(2)] was examined at pressures up to 10.7 GPa in order to examine whether the high-pressure structure reflects the crystal's metallic nature. Crystal structure analyses were performed at 0.2, 0.8, 1.3, 3.0, 5.5, and 10.7 GPa on the basis of the pow…
Abstract A novel dilatometer to investigate the specific volume of polymers as a function of the combined effect of pressure (100 MPa), temperature (300°C), cooling rate (100°C/s) and shear rate (200 l/s) was developed. The dilatometer consists of a pressure cell, which in design is a combination of a traditional “pis…
Abstract 1,5‐Pentanediol dibenzoate (PDDB) was evaluated as a potential “green” plasticizer for poly(vinyl chloride) (PVC) at concentrations ranging between 20 and 80 parts by weight per hundred parts of resin. The results of glass transition temperature ( T g ) and tensile tests of PDDB blends with PVC were compared…
Abstract The copper(II) open cubane 1 has been synthesized and its structure determined. It is insoluble in water and efficiently catalyzes the Henry reaction with high yield. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
A new class of integrative radial crystals (Krause et al 2006 Phys. Rev. Lett. 96 165502) and radial superlattices (RSLs) (Deneke et al 2004 Appl. Phys. Lett. 84 4475) has been realized by the roll-up of semiconductor-based hybrid layer systems on a substrate surface (Prinz et al 2000 Physica E 6 828, Schmidt and Eber…
Abstract Several parameters, such as crosslinking agent concentration, blowing agent concentration, and temperature, were varied to evaluate their effects on the structure and mechanical properties of low‐density polyethylene (LDPE) foams. Dicumyl peroxide (DCP) was used as crosslinking agent, while azodicarbonamide (…
Gold nanoparticles of various sizes, supported onto ceria, were synthesized using both deposition−precipitation and coprecipitation methods. Whatever the size, the study of the Au/CeO 2 interface confirms the existence of two preferential orientation relationships with a dislocation network which compensates the 25% i…
Starting from the full many-body Hamiltonian of interacting electrons the effective self-energy acting on electrons residing in a subspace of the full Hilbert space is derived. This subspace may correspond to, for example, partially filled narrow bands, which often characterize strongly correlated materials. The forma…
Shape memory polymer is an important area of interest in the polymer science research because of its many applications in industry such as biomedical, smart textiles, actuations and so on. Among the shape memory polymers, temperature responsive shape memory polymers are gaining much attention to the scientist as their…
High quality SrTiO 3 thin film on (1 1 0) DyScO 3 substrate is grown by laser molecular beam epitaxy. The lattice strain resulting from the lattice mismatch between the substrate and the film relaxes gradually with depth. A critical thickness of about 30 nm for sharp strain relaxation is observed. The dislocation dens…
The solid-state structure of mercury oxide and its low-pressure modifications are known to significantly differ from those found for the corresponding zinc and cadmium compounds, that is, one changes from a simple hexagonal wurtzite or cubic rock salt structure found in zinc oxide and cadmium oxide to unusual chainlik…