Materials Literature
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The investigation of two perovskite manganites with the same carrier concentration of 0.1 electron per Mn has been performed using neutron powder diffraction and electron microscopy, and completed with transport and magnetic measurements. For ${\mathrm{Sm}}_{0.1}{\mathrm{Ca}}_{0.9}{\mathrm{MnO}}_{3},$ whatever the tem…
A ligand with a linear arrangement of three coordination pockets produces a Cu9O12, alkoxide-bridged, square grid of closely spaced copper centers (see picture) in high yield by a strict self-assembly process. Orthogonal bridging connections within the grid lead to dominant intramolecular ferromagnetic coupling with a…
The single-crystal X-ray structures of three odd-membered thiophene oligomers bearing one central thienyl- S, S -dioxide moiety trimer, pentamer, and heptamer are reported. Absolute photoluminescence quantum yields in microcrystalline powders are given for all compounds. The solid-state photoluminescence efficiencies…
The crystallographic and magnetic properties of the $\mathrm{Mn}[\mathrm{N}(\mathrm{CN}{)}_{2}{]}_{2}$ compound have been investigated by dc magnetization, ac susceptibility, specific heat, and zero-field neutron diffraction on polycrystalline samples. The magnetic structure consists of two sublattices which are antif…
The conversion efficiencies of organic photovoltaic devices have been improved by a factor of 4–5 by introducing a large surface-area interface between the donor and acceptor layers. Stratified films of a fullerene-based acceptor (see Figure) were spin-coated on top of a donor (MDMO-PPV), forming a diffuse interface w…
In the ring $\mathbf{Z}[\frac{1+\sqrt{5}}{2}]$, there is a natural subdivision technique analogous to regular subdivision in rational algebraic rings like $\mathbf{Z}[\frac{1}{2}]$. The properties of this subdivision process are developed using the matrix associated to the Fibonacci substitution tiling. These properti…
A rare case of ternary polymer miscibility has been demonstrated in the mixture (in the glassy amorphous domains) comprising three polymers: polyetherimide (PEI), a new semicrystalline meta-linked poly(ether diphenyl ether ketone) (PEDEKm), and semicrystalline poly(ether ether ketone) (PEEK). The Tg-composition relati…
Nanostructured materials have many forms. One that has been somewhat neglected until recently is organogels, especially those whose three-dimensional structural networks are based on the self-assembly of low molecular-mass organic gelators (LMOGs). These thermoreversible materials consist of a small amount of LMOG and…
In this article, we report results of an extensive characterization study involving scanning electron microscopy, spectroscopic ellipsometry (SE), photothermal deflection spectroscopy (PDS), x-ray photoelectron spectroscopy, x-ray Auger electron spectroscopy (XAES), current–voltage (I–V) measurements, hydrogen content…
Abstract The surface characteristics of carbon—silica dual phase filler (CSDPF) were investigated by inverse gas chromatography (IGC) at infinite dilution. It was found that due to its unique surface microstructure, the dispersive component of the surface energy γ s d of CSDPF is considerably higher than those of carb…
A paper describing several micas, which have been used in the insulation systems of high power rotating machines for many years.
The vibrational and structural characteristics of a CO3-rich apatite from an extrusive carbonatite in Kasekere, Uganda, were studied by infrared and Raman spectroscopy, single-crystal X-ray diffraction and electron microprobe analysis. Electron microprobe analysis provided, based on Σ(large cations) = 10, a cation con…
The HRP-catalyzed oligomerization of cinnamoyl-hydroquinone-ester and cinnamoyl-4-hydroxyanilide led to the formation of soluble polyphenols. The oligomers were synthesized in water/1,4-dioxane and in water/acetone mixtures and characterized by NMR, FTIR and SEC. Upon UV-treatment of the homogenous films the polypheno…
Detailed electron spin resonance experiments have been performed on single crystals of $(\mathrm{TMTSF}{)}_{2}{\mathrm{PF}}_{6},$ $(\mathrm{TMTSF}{)}_{2}{\mathrm{AsF}}_{6},$ and $(\mathrm{TMTTF}{)}_{2}\mathrm{Br}.$ These low-dimensional organic compounds undergo transitions to incommensurate and commensurate antiferro…
Das Einführen verzweigter Alkylketten am Phenylkern des Substituenten R bei Hexaalkylbenzolen (siehe Formelbild) erwies sich als Schlüsselschritt bei der Synthese des ersten bei Raumtemperatur diskotisch-nematischen Flüssigkristalls. Eine Flüssigkristallanzeige mit diesen Eigenschaften bietet gegenüber herkömmlichen A…
The residual stress in thin diamond films with a strongly improved heteroepitaxial alignment has been studied by x-ray diffraction and micro-Raman spectroscopy. The measurements have been compared with the predictions from finite element simulations. The diamond films have been deposited by microwave plasma chemical v…
Organotin‐substituted Keggin or Dawson tungstophosphates [(CH3OOCCH2CH2Sn)3–(PW9 O34)2]9−, [(CH3OOCCH2CH2Sn)PW11O39]4−, [(CH3OOCCH2CH2Sn)P2 W17O61]7−, [(CH3OOCCH(CH3)CH2Sn)3(PW9 O34)2]9−, [(CH3OOCCH(CH3)CH2Sn)PW11O39]4− and [(CH3OOCCH(CH3)CH2Sn)P2W17 O61]7− have been prepared by reactions of the β–methoxycarbonylethyl…
Oriented melt-spun ribbons with composition Sm1+Y(Co1−XCux)5 (X=0–0.3 and Y=0–0.2) were fabricated with a wheel speed of 5 m/s, followed by annealing in the temperature range of 600–1000 °C for 30 min. Our results show that a high degree of texture, in which the c axis is parallel to the longitudinal direction of the…
Iron boride nanowires are synthesized here by reaction of Fe-filled carbon nanotubes with boron oxide vapor. The thus formed FexB nanowires are encapsulated within the nanotubes (see Figure) and their diameter is approximately that of the starting material, demonstrating that the reaction is confined within the nanotu…
The nature of the simplest transport processes in water, namely, self-diffusion and shear viscosity, is analyzed on the basis of a version of the microinhomogeneous structure model. The study predicts the existence of locally ordered groups of molecules, taking into account considerations of acoustic properties, light…