Materials Literature
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Abstract The catalytic reduction of NO with CO was investigated in the presence of oxygen over 16 supported metallic catalysts. Ir/WO3, Ir/ZnO, and Rh/Al2O3 showed the pronounced activity even in excess amount of oxygen. The effect of preparation conditions on the activity of Ir catalysts was further studied and it wa…
Abstract A novel, trifluoromethyl‐substituted, bis(ether amine) monomer, 1,4‐bis(4‐amino‐2‐trifluoromethylphenoxy)naphthalene, was synthesized through the nucleophilic displacement of 2‐chloro‐5‐nitrobenzotrifluoride with 1,4‐dihydroxynaphthalene in the presence of potassium carbonate in dimethyl sulfoxide, followed b…
A [100] twist low-angle grain boundary in ${\mathrm{SrTiO}}_{3}$ was systemically studied by means of conventional transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), lattice distortion analysis, and electron energy-loss spectroscopy (EELS). A dislocation network is formed in th…
We calculate thermal transport in the Falicov-Kimball model on an infinite-coordination-number Bethe lattice. We perform numerical calculations of the thermoelectric characteristics and concentrate on finding materials parameters for which the electronic thermoelectric figure-of-merit $\mathrm{ZT}$ is large, suggestin…
We have investigated the transport and magnetic properties of the perovskite ${\mathrm{LaCo}}_{1\ensuremath{-}y}{\mathrm{Ni}}_{y}{\mathrm{O}}_{3},$ an alloy of ${\mathrm{LaCoO}}_{3}$ (a semiconductor that exhibits spin-state transitions) and ${\mathrm{LaNiO}}_{3}$ (a paramagnetic metal). The metal-insulator transition…
${\mathrm{SmCo}}_{5}$ is a technologically important material, having one of the largest magnetic anisotropy energies (MAE) of any hard magnet system. Common dopants include Fe and Cu, which produce grain boundaries that align individual grains, but also unintentionally dope the material within the grains. We have stu…
Nylon 6,6 single‐crystal scrolls and tubes (see Figure) have been created through self‐seeding solution crystallization. The tube diameter is ∼ 350 nm with a ∼ 10 nm thin wall. The tubular/scroll single crystal form is presumably due to the asymmetric folding of Nylon 6,6, which can be turned on and off by controlling…
Anisotropic films of poly(3,4‐ethyldioxythiophene) (PEDOT) have been prepared by polymerization in an aqueous, self‐organized liquid crystalline template. The cylindrical, hydrophobic cores of the hexagonal template direct electropolymerization, producing films with anisotropic optical absorption and conductivity (see…
Abstract The grafting of powder and granular polypropylene (PP) with maleic anhydride (MA) was investigated in a reactive extrusion process with dicumyl peroxide (DCP) as an initiator. The effects of the MA and DCP contents in the feed on grafting were investigated. Under the experimental conditions applied in this st…
Reversibly photoswitchable proton transfer processes can occur between a three‐state molecular switch based on spiropyran (SP) and the “salt form” of polyaniline (see Figure), both in solution and in the solid state. As a result, the electrical conductivity of the thin‐film of SP‐doped polyaniline can be photoregulate…
Abstract Single‐walled carbon nanotubes (SWNTs) were modified with polyethylene (PE) prepared by in situ Ziegler–Natta polymerization. Because of the catalyst pretreated on the surface of the SWNTs, the ethylene was expected to polymerize there. Scanning electron microscopy images and solubility measurements showed th…
Resistivity, dc magnetization, ac susceptibility, and heat-capacity measurements were carried out for polycrystalline ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$ $(0<~x<~0.55).$ Insulating, metallic, and metal-insulator transition (MIT) regions appear successively with increasing x. The…
$\mathrm{Ln}\mathrm{CuO}\mathrm{Ch}$ $(Ln=\mathrm{lanthanide},Ch=\mathrm{chalcogen})$ layered oxychalcogenides are wide-gap $p$-type semiconductors composed of alternately stacked ${(Ln}_{2}{\mathrm{O}}_{2}{)}^{2+}$ oxide layers and $({\mathrm{Cu}}_{2}{\mathrm{Ch}}_{2}{)}^{2\ensuremath{-}}$ chalcogenide layers. Energy…
We have made a detailed temperature-dependent photoemission study of ${\mathrm{VO}}_{2}/{\mathrm{TiO}}_{2}(001)$ thin films, which show a metal-insulator transition at \ensuremath{\sim}300 K. Clean surfaces were obtained by annealing the films in an oxygen atmosphere. Spectral weight transfer between the coherent and…
Ultra‐thin t ‐Se nanoribbons are produced simply and conveniently via a vapor–liquid–solid (VLS) mechanism. The nanoribbons are highly crystalline and grow preferentially along the c ‐axis, with an average thickness of 15 nm (see Figure) and lengths up to several hundreds of micrometers. The intermediates in the forma…
The temperature dependence of thermal conductivity, $\ensuremath{\kappa}(T),$ and magnetic susceptibility, $\ensuremath{\chi}(T),$ have been measured on single crystals of $L{\mathrm{CoO}}_{3}$ $(L=\mathrm{La},$ Pr, Nd) grown by the floating-zone method. The susceptibility measurement shows a progressive stabilization…
Raman spectroscopy on carbon nanotubes (CNT) yields a rich variety of information owing to the close interplay between electronic and vibrational properties. In this paper, we review the properties of double wall carbon nanotubes (DWCNTs). In particular, it is shown that SWCNT encapsulating C$_{60}$, so-called peapods…
The distribution of the transport current in a superconducting filament aligned parallel to the flat surface of a semi-infinite bulk magnet is studied theoretically. An integral equation governing the current distribution in the Meissner state of the filament is derived and solved numerically for various filament-magn…
We show that spin-polarized dc current passing through a small magnetic element induces two-state, random telegraph switching of the magnetization via the spin-momentum transfer effect. The resistances of the states differ by up to 50% of the change due to complete magnetization reversal. Fluctuations are seen for a w…
We study theoretically the temporal evolution and the spatial structure of the interface between two polymer melts involving three different species (A, A* and B). The first melt is composed of two different polymer species A and A* which are fairly indifferent to one another (Flory parameter chi_AA* ~ 0). The second…