Materials Literature
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The luminescence efficiency of polymer light-emitting diodes is enhanced to more than double by doping ZnO nanorods into the poly-(3,4-ethylenedioxythiophene):poly-(styrenesulphonic acid) (PEDOT:PSS) hole buffer layer. It was demonstrated, by means of the optical and electrical characteristics and Raman spectroscopy,…
Electron thermalization and electron–phonon relaxation in metals can be studied by measuring the transient change in sample reflectivity after excitation with a femtosecond laser pulse. This paper describes experiments on ferromagnetic nickel thin films, in particular addressing the analysis of the reflectivity data a…
The magnetic properties of ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Fe}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ perovskites with different oxygen vacancy contents were comprehensively investigated by means of x-ray diffraction, M\"ossbauer spectroscopy, and magnetization measurements. A glassy magnetic…
A series of low-melting, highly volatile, and thermally/air stable diamine-coordinated magnesium metal−organic chemical vapor deposition (MOCVD) precursors, Mg(hfa) 2 (diamine) and Mg(hfa) 3 H(diamine) (hfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate), has been synthesized in a single-step aqueous reaction under ambie…
The transformation from A(1)B diblock copolymer to A(1)BA(2) triblock copolymers varying in molecular asymmetry is investigated as the A(2) end block is progressively grown via chemical synthesis. Dynamic rheological measurements show that the order-disorder transition (ODT) temperatures of two copolymer series differ…
The effect of shear flow on the microstructure in a weakly aggregated suspension is investigated. Monodisperse small silica particles with a grafted layer of 1-octadecanol are dispersed in n-tetradecane, yielding a thermoreversible sticky sphere model suspension. A combination of small angle light scattering and ultra…
Detailed resonant x-ray diffraction experiments including azimuthal angle scans were performed on $\mathrm{Nd}\mathrm{Ni}{\mathrm{O}}_{3}$ around the Ni $K$ absorption edge, allowing us to investigate the electronic changes associated with the metal-to-insulator transition. The influence on the observed reflections of…
Here we report systematic studies on the epitaxial growth and properties of Zn1−xVxO[x=0.001-0.2] thin films deposited onto sapphire c-plane single crystals. The thin films were deposited using pulsed laser deposition technique and were found to be epitaxial in nature. X-ray diffraction and high resolution transmissio…
We show that a protein with no intrinsic inorganic synthesis activity can be endowed with the ability to control the formation of inorganic nanostructures under thermodynamically unfavorable (nonequilibrium) conditions, reproducing a key feature of biological hard-tissue growth and assembly. The nonequilibrium synthes…
The use of low dielectric constant (low-k) interdielectrics in multilevel structure integrated circuits (ICs) can lower line-to-line noise in interconnects and alleviate power dissipation issues by reducing the capacitance between the interconnect conductor lines. Because of these merits, low-k interdielectric materia…
Dynamic mechanical analysis was successfully used, for the first time, to characterize polymer thin and ultrathin films supported on substrates. This method allowed us to uncover the effects of the free surface and the substrate interface on the segmental dynamics in polystyrene (PS) films with various thicknesses. As…
Single-wall carbon nanotubes (SWNTs) chemically assembled on gold substrates were employed as electrodes to investigate the charge transfer process between SWNTs and the underlying substrates. Cyclic voltammetry (CV) indicates that the assembled SWNTs allow electron communication between a gold electrode and the redox…
The application of in situ FBRM and ATR-FTIR in monitoring a polymorphic transformation in a solution of d -mannitol is introduced. The isothermal growth of the stable β-form in a supersaturated solution is initially monitored. This β-form has a needlelike habit, and it is noted that the dominant FBRM chord length is…
The synthesis of homogeneously distributed carbon nanofibers with well-defined morphology on vapor-grown carbon nanofibers was achieved by a sequence of gas-phase steps, thus fully avoiding wet chemistry: first, carbon nanofibers were exposed to oxygen plasma to introduce oxygen-containing functional groups. Then, the…
Polystyrene latex particles modified at the surface with different hydrophilic functional groups were prepared by miniemulsion polymerization and used as controlling agents in the crystallization of zinc oxide from aqueous medium. The effects of the chemical nature of the surface functionalization and the latex concen…
Exceptionally high thermoelectric figure of merit (zT>2), has been reported for (Ag1−ySbTe2)0.05(PbTe)0.95, which may involve the nanoscale microstructure. However, conflicting reports on the same materials claim only zT of 1 or less. Here we show that (Ag1−ySbTe2)0.05(PbTe)0.95 materials are multiphase on the…
Supercooled o-terphenyl has been the subject of many investigations including dielectric relaxation spectroscopy. Due to the low dielectric strength and the tendency to crystallize at elevated temperatures, a detailed shape analysis of the loss profile from the glass transition temperature Tg to approximately 1.2 Tg i…
Ultra-fine fibrous membranes were prepared by electrospinning of aqueous mixtures of poly(acrylic acid) and poly(vinyl alcohol) at 17%–83% PAA or 0.14–3.5 COOH/OH molar ratios and cross-linked by heat-induced (140 °C, 5 min) esterification. The fibre diameters increased from 270 to 450 nm with increasing PAA contents.…
A number of recent studies indicate that, under the oxygen rich conditions of oxidation catalysis, some transition metal catalysts may be covered by thin oxide overlayers. Moreover, it has been suggested that such “surface-oxide” layers are catalytically active, possibly more active than the pure metal surfaces as was…
The use of computational methods for the study of clay minerals has become an essential adjunct to experimental techniques for the analysis of these poorly ordered materials. Although information may be obtained through conventional methods of analysis regarding macroscopic properties of clay minerals, information abo…