Materials Literature
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Abstract Optically active nanostructures comprised of polymer multilayer microspheres surrounding semiconductor quantum dots are studied. Comparative analysis of the optical properties of the microspheres with four alternating layers with different refractive indices is performed. Photoluminescence and extinction char…
The magnetic properties of three epitaxial La 0.7 Sr 0.3 MnO 3 films of thickness 5, 15 and 40 nm grown on SrTiO 3 (001) substrates were investigated. The structural transition of the SrTiO 3 substrate induces a magnetic transition in the manganite films due to magnetoelastic coupling. Below the temperature of the str…
The authors present a mechanism explaining complex diffraction efficiency dynamics of the holographic grating recording process in azobenzene-functionalized polymer. The mechanism assumes simultaneous formation of three coupling phase gratings with different recording time constants and constant, equal to 0 or π, phas…
NU clusters: Novel imido uranium(IV) clusters involving four or seven metal centers have been obtained from the reaction of UCl4 and [{PhNMg(thf)}6] in thf or pyridine (see core structure; U yellow, N purple, Cl green, O red). The aggregation is strongly dependent on the nature of the solvent.
Computer simulation results are reported for a realistic polarizable potential model of water in the supercooled region. Three states, corresponding to the low density amorphous ice, high density amorphous ice, and very high density amorphous ice phases are chosen for the analyses. These states are located close to th…
We have prepared glasses having xFeO⋅(100−x)P2O5 (mol %) (x=50.0,54.0,57.1) compositions by melting under mild reducing condition and found that these glasses exhibit fairly high transmittance in the visible range and large Faraday effect at the wavelength of about 400nm. Fe57 Mössbauer spectra confirm that almost all…
Abstract— Ga‐doped ZnO (GZO) films with thicknesses of 30–560 nm were prepared on glass substrates at 200°C by ion plating with direct‐current arc discharge. The dependences of the characteristics of GZO films on thickness were investigated. All the polycrystalline GZO films, which showed high transmittance in the vis…
Abstract Oxygen plasma is widely employed for modification of polymer surfaces. Plasma treatment process is a convenient procedure that is also environmentally friendly. This study reports the effects of oxygen plasma treatment on the surface properties of poly( p ‐phenylene terephthalamide) (PPTA) fibers. The surface…
Element specific x-ray magnetic dichroism measurements have been carried out at the $\text{Ga}\text{ }K$ and Ga and $\text{Gd}\text{ }{L}_{3}$ edges of the dilute magnetic semiconductor (DMS) Gd:GaN grown by molecular beam epitaxy. This DMS material has previously been reported to exhibit room temperature magnetic ord…
The newly discovered oxypnictide family of superconductors show very high critical temperatures of up to 55 K. Whilst there is growing evidence that suggests a nodal order parameter, point contact Andreev reflection spectroscopy can provide crucial information such as the gap value and possibly the number of energy ga…
The incoherent approximation for the determination of the vibrational density of states of glasses from inelastic neutron or x-ray scattering data is extended to treat the coherent scattering. The method is applied to new room temperature measurements of vitreous silica and germania on the thermal time-of-flight spect…
We present the results of a molecular dynamics simulation study of thermodynamic and structural properties upon supercooling of a low concentration sodium chloride solution in TIP4P water and the comparison with the corresponding bulk quantities. We study the isotherms and the isochores for both the aqueous solution a…
Abstract In aqueous systems, partially hydrophobic particles are known to stabilize foams even in the absence of any added surfactant. This paper shows that the same principle can be applied to polymeric systems: particles that are partially wetted by a polymer melt can stabilize a foam of that polymer. The foam stabi…
Kleine Mengen an Kohlenstoffnanoröhren (CNTs) in einer Lösung von Oligo(p-phenylenvinylen) OPV1 in Toluol führen zu Selbstorganisation unter Bildung eines Kompositgels (siehe Bild), das höhere Stabilität und bessere Fließeigenschaften als das OPV1-Gel zeigt. Starke physikalische Wechselwirkungen zwischen den Spezies e…
Abstract In this study, we have investigated the effect of nitric acid oxidation on the dispersion and suspension stability of activated carbon powder. We treated activated carbon powder with nitric acid at different concentrations. We measured the content of functional groups, the zeta potential and the powder partic…
To enhance the service temperature of relaxor-PbTiO3 pyroelectric single crystals, high quality ternary perovskite single crystal was grown by a modified Bridgman technique. Analyzed by x-ray fluorescence, the as-grown crystal is 0.41Pb(In1∕2Nb1∕2)O3–0.17Pb(Mg1∕3Nb2∕3)O3–0.42PbTiO3 [PIMNT(41/17/42)], which appears to…
Polarized Raman spectra were measured for single crystals and polycrystalline ${\text{ZnGeN}}_{2}$ grown by a vapor-liquid-solid method. A group-theoretical analysis of the selection rules governing the predicted dependence of the spectra on incoming and outgoing wave polarizations and propagation direction is present…
Abstract Synthetische magnetische Nanopartikel (MNP) werden in der Biomedizin immer häufiger als Sonden eingesetzt. Dies gilt besonders für die Anwendung in der Kernspintomographie (Magnetic Resonance Imaging, MRI). Diese Nanopartikel sind von ähnlicher Größe wie biologische Funktionseinheiten. Deshalb und wegen ihrer…
<div class="htmlview paragraph">Urea Selective Catalytic Reduction (SCR) has been proven to significantly reduce NOx emissions from diesel engines. The thermal decomposition of urea, which forms the ammonia as the reactant, has a crucial effect on the performance and durability of the NOx-SCR system. The incompl…
Upconverting (UC) phosphors (UCPs) are ceramic materials doped with rare earth ions. These materials can absorb and upconvert infrared (IR) radiation to emit visible light by the stepwise excitation among discrete energy levels of the rare earth ions. UCPs are potentially useful reagents for use in bioimaging since th…