Materials Literature
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A thin-layer electrochemical flow cell coupled on-line with electrospray mass spectrometry (EC/ES-MS) was used to investigate the soluble products from the controlled-potential anodic polymerization of aniline in H(2)O and H(2)O/CH(3)OH (1/1 v/v) with ammonium acetate and acetic acid or ammonium hydroxide as electroly…
Abstract A conducting polymer having photochromic diarylethene units in the main chain was synthesized. Reversible photochromism was observed in solid film, and photoluminescence and electrical conductivity were found to change along with the photoisomerization.
The structural and electronic properties of some simple ternary oxides with the delafossite-type structure have been investigated using the periodic Hartree−Fock method and a posteriori density-functional corrections. The coexistence in the same crystal structure of different structural motifs, such as MO 6 octahedra,…
We investigate the depletion induced phase separation in mixed suspensions of colloidal spheres with diameter σ and colloidal rods with length L and diameter D. Using an extension of the free volume method developed by one of us [H.N.W. Lekkerkerker and A. Stroobants, Physica A 195, 387 (1993)], we calculate the phase…
A mathematical model of an electrochemical capacitor with hydrous ruthenium oxide electrodes including both double‐layer and surface faradaic processes is developed to predict the behavior of the capacitor under conditions of galvanostatic charge and discharge. The effect of particle size is studied and shows that the…
We present an experimental study of the premartensitic and martensitic phase transitions in a ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ single crystal by using ultrasonic techniques. The effect of applied magnetic field and uniaxial compressive stress has been investigated. It has been found that they substantially modify the…
Newly synthesized sexithiophenes, di- and tetramethylated at the β-positions, are shown to be soluble and processable compounds, giving single crystals suitable for X-ray structure determination. The molecular packing was characterized in terms of crystal cohesion and short C H··· S and C H···π intermolecular distance…
With the rise of Bayesian methods in crystallography, the error estimates attached to estimated phases are becoming as important as the phase estimates themselves. Phase improvement by density modification can cause problems in this environment because the quality of the resulting phases is usually overestimated. This…
A fluid DGEBA/methyl nadicanhydride epoxy system has been filled with inorganic particles, cast as bubble-free plates and cured. The ability of both the pure network polymer and the polymer/particle composites to withstand partial electrical discharges has been investigated. Three types of particle combinations were u…
The phosphoenolpyruvate (PEP)-dependent phosphotransferase system (PTS) phosphorylates sugars and regulates cellular metabolic processes using a phosphoryl transfer chain including the general energy coupling proteins, Enzyme I (EI) and HPr as well as the sugar-specific Enzyme II complexes. Analysis of the Escherichia…
The GaAs(100) surfaces chemically treated in HCl-isopropanol solution and annealed in vacuum were studied by means of Auger electron spectroscopy, x-ray photoelectron spectroscopy, high-resolution electron energy-loss spectra, and Low-energy electron diffraction (LEED). Chemical treatment and sample transfer into ultr…
The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT[48]Dodecaphyrin-(1.0.1.0.1.0.1.0.1.0.1.0) and [64]Hexadecaphyrin-(1.0.1.0.1.0.1.0.1.0.1.0.1.0.1.0): The Largest CyclopolypyrrolesJun-ichiro Setsune, Yasuyuki Katakami, and Noriko IizunaView Author Information Department of Chemistry, Faculty of Science, and Graduate S…
Using an iterative sequence of Wittig olefination, reduction, oxidation, and condensation of an active methylene group to carbonyl, it was possible to prepare a series of organometallic push−pull molecules [(CO) 5 M C(OCH 3 )(−CH CH−) n (C 5 H 4 )Fe(C 5 H 5 ), M = W, Cr, n = 1−4] in which ferrocene is the donor elemen…
The synthesis, electrochemistry, and spectroscopic behavior of tetradentate bis(salicylidenimine) transition metal complexes 5 − 9 are reported. Appending these complexes with 3,4-ethylenedioxythiophene (EDOT) moieties allows for electrochemical polymerization at much lower potentials than the parent salen complexes.…
X-ray diffraction application of synchrotron X-radiation to problems in materials science X-ray fluorescence analysis small-angle scattering of X-rays and neutrons X-ray microscopy.
Monodispersed ultrafine (nano‐ to micrometer) zirconia precursor powders were synthesized by three different physicochemical methods: (I) forced hydrolysis, (II) homogeneous precipitation in inorganic salt solutions, and (III) hydrolysis/condensation of alkoxide. The forced hydrolysis method produced monoclinic nanocr…
Electron diffraction data are used to obtain the structure solution of a large-pore, high-silica zeolite, SSZ-48 that contains an occluded organic structure directing agent. The structure is determined by electron diffraction refinement and is confirmed by high-resolution transmission electron microscopy and Rietveld…
Abstract δ-phase (β-PF6 type) BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene)-based organic conductors are characterized by the twisted overlap mode in the stack. Since the twisted mode has large intermolecular orbital overlap, the δ-phase is regarded as a twisted dimer structure. This type of overlap is, however, in…
Methods for dynamic characterization of composite materials were extended and applied to the study of strain rate effects under transverse compression as well as shear. Falling weight impact and Split Hopkinson Pressure Bar systems were developed for dynamic characterization of composite materials in compression and s…