Materials Literature
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Co-doped titanate nanotubes were synthesized through 130 °C treatment of Co-doped TiO2 powders in high concentration NaOH aqueous solutions in a hydrothermal autoclave. The obtained nanotubes were identified to be of a monoclinic layered trititanate structure, the same as H2Ti3O7, their un-doped counterpart. The incor…
A display device with dual electroluminescence and electrochromic display functions is described. The device consists of two layers of polymeric thin films, one of which is an electrochromic polymer and the other an electroluminescence polymer, that are sandwiched between two electrodes. Both polymers are blended with…
Abstract Summary: A methacrylate‐functionalized poly(ethylene glycol) macromonomer was copolymerized at the surface of methacrylate‐derivatized maghemite nanoparticles. After silylation of the magnetic core with methacryloxypropyltrimethoxysilane, two grafting procedures based on either a direct copolymerization react…
Thin-film ferromagnetic semiconductors Sb2−xVxTe3 with the Curie temperature as high as 177K were prepared on sapphire (0001) substrates by molecular-beam epitaxy. Films of Sb2−xVxTe3 with x up to 0.35 display robust, out-of-plane ferromagnetic ordering that depends on the concentration of vanadium in the structure. T…
Abstract With a two‐step miniemulsion polymerization, hydrophobic polyurethane (PU) dispersions were prepared with a cosurfactant, the costabilizer hexadecane (HD) in the oil phase, and sodium dodecyl sulfate (SDS) in the water phase. The first step involved the formation of NCO‐terminated prepolymers between isophoro…
Wurtzite-type CdS and CdSe nanotubes have been grown via a Sn nanowire-templated route under thermal annealing. The tubes are structurally uniform and defect-free single crystals, and partially or completely filled with Sn nanowires; most of the tubes display pin-like structures showing significant tapering along thei…
Temperature-dependent and photoinduced x-ray absorption spectra were measured in the Ti-$K$ edge of $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$. The change in the spectra is explained by a collapse of the inversion symmetry, accompanied by a relative local vibration of the Ti atom. In particular, photoinduced x-ray absor…
Time-dependent density functional theory faces an important problem when it comes to extended systems: The long-range component of the exchange-correlation kernel ${f}_{\mathrm{xc}}$ is completely absent from local density or generalized gradient approximations, but it is believed to be present in the ``exact'' ${f}_{…
Ash deposits from four candidate power turbine synfuels were studied in an accelerated deposition test facility. The facility matches the gas temperature and velocity of modern first-stage high-pressure turbine vanes. A natural gas combustor was seeded with finely ground fuel ash particulate from four different fuels:…
We have measured magnetic susceptibility and resistivity of ${\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}\mathrm{Co}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ ($x=0.1$, 0.15, 0.2, 0.215, 0.225, 0.25, 0.3, and 0.4), and found that ${\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}\mathrm{Co}{\mathrm{O}}_{3\e…
The source of the experimentally observed anomalous behavior of the first sharp diffraction peak (FSDP) in lithium silicate glasses was determined using classical molecular dynamics simulations. Partial structure factors obtained from simulations were used to investigate the sensitivity of the total structure factor t…
Abstract A large number of one‐dimensional bundles of ZnSe nanowires with diameters ranging from 15–20 nm and lengths of up to tens of micrometers have been prepared via the thermal treatment of a ribbon‐like precursor (ZnSe·3ethylenediamine), which has been synthesized by a mixed solvothermal route, in an argon atmos…
Zinc oxide (ZnO) is a wide-band-gap semiconductor with potential optical, electronic, and mechanical applications. First-principles investigations [C. G. Van de Walle, Phys. Rev. Lett. 85, 1012 (2000)] predicted that hydrogen impurities act as shallow donors in ZnO. IR spectroscopy [M. D. McCluskey et al., Appl. Phys.…
We have grown composite epitaxial materials that consist of semimetallic ErAs nanoparticles embedded in a semiconducting In0.53Ga0.47As matrix both as superlattices and randomly distributed throughout the matrix. The presence of these particles increases the free electron concentration in the material while providing…
We investigate the physical meaning of the intrinsic crack resistance in the Griffith theory of brittle fracture by means of atomic-scale simulations. By taking cubic SiC as a typical brittle material, we show that the widely accepted identification of intrinsic crack resistance with the free surface energy underestim…
A numerical procedure has been used for the prediction of the Seebeck coefficient of a crystalline material based on its electronic band structure with the goal of testing this approach on the simple polymers polythiophene and polyaminosquaraine. The investigation of several representative materials, including the cry…
The high-frequency mobility in disordered systems is governed by transport properties on mesoscopic length scales, which makes it a sensitive probe for the amount of local order. Here we present a method to measure the energy dependence of the high frequency mobility by combining an electrochemically gated transistor…
Recent conductance measurements on multi-wall carbon nanotubes (CNTs) reveal an effective behavior similar to disordered single-wall CNTs. This is due to the fact that electric current flows essentially through the outermost shell and is strongly influenced by inhomogeneous electrostatic potential coming from the inne…
We have investigated three-dimensional magnetization structures in numerous mesoscopic Fe/Mo(110) islands by means of x-ray magnetic circular dichroism combined with photoemission electron microscopy (XMCD-PEEM). The particles are epitaxial islands with an elongated hexagonal shape with length of up to 2.5 micrometer…
Possibility for the formation of stable Al atomic wire on the Si(211) surface is investigated using density functional theory based total energy calculations. The stable adsorption sites and the surface structures at various sub-monolayer coverages of Al are presented. It is found that the most stable and natural surf…