Materials Literature
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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…
Thin amorphous and polycrystalline tungsten oxide films have been prepared by Chemical Vapor Deposition (CVD) from metallorganic precursor − tungsten hexacarbonyl − at atmospheric pressure. The dependence of the composition and the structure of tungsten oxide films on the technological conditions has been investigated…
Abstract An optimization method is used to select the wavenumbers k for the inverse Fourier transform in 2.5D electrical modelling. The model tests show that with the wavenumbers k selected in this way the inverse Fourier transform performs with satisfactory accuracy.
The effect of re-oxidation treatment on the solubility in dopants and the dielectric properties of Ho–Mg- and Ho–Mn-substituted BaTiO 3 was investigated. The lattice parameter and electrical resistivity results indicated that the predominant occupational sites of Ho ions changed from A -sites to B -sites by increasing…
Glossic Fragiudalfs comprise several million hectares of agronomically important soils within the silty uplands of the lower Mississippi River Valley (Major Land Resource Area [MLRA] 134). These soils are typified by a fragipan within 100 cm of the surface overlain by a 5‐cm‐thick, or more, glossic horizon containing…
An investigation of particle contamination in uniform and coaxial fields.
Diethyl carbonate (DEC) and diols, such as 1,3-propanediol and 1,4-butanediol, were polymerized by a lipase at a temperature between 40 and 80°C to yield the corresponding aliphatic polycarbonates in a successive two-step polymerization. Bulk polymerization, especially at a temperature between 70 and 75°C, and prefera…
Molecular-dynamics simulations are used to apply shear to the twinned microstructure of an hcp metal, represented by a Finnis-Sinclair-type potential for zirconium. The twinned microstructure results from a simulated martensitic phase transition from the high-temperature phase, and hence contains some boundary defects…
The structure of LaAlO 3 has been investigated around the phase transition at T c ≈ 800 K by neutron powder diffraction in vacuum and by X-ray powder diffraction under nitrogen atmosphere as well as by a very high resolution synchrotron experiment in air. The results were analysed in frame of the Landau theory using t…
The solubility of H 2 O in three melt compositions along the haploandesite join Na 2 Si 4 O 9 - Na 2 (NaAl) 4 O 9 (0, 3, and 6 mol% Al 2 O 3 ) was determined as a function of pressure and temperature from 0.8 to 2.0 GPa and 1000 to 1300 °C. Water solubility is a linear (or near-linear) positive function of pressure (1…
We describe two electro-optical systems for adaptive focusing of linearly polarized light. The aperture size is 5 mm and the focal length can be varied from 1 to 4 m for wavelengths from 0.663 to 0.85 μm. The first is a commercially available system including a PC compatible control unit and software, and an adaptive…
Die Existenz einer lückenlosen Mischkristallreihe Cu1–xZnxMoO4 (0 ≤ x ≤ 1) wird nachgewiesen. Einkristalle wurden durch Chemischen Transport mit verschiedenen Transportmitteln erhalten. Die Charakterisierung der Zusammensetzung und der Struktur erfolgte durch EDX-Analyse, durch Photometrie und durch Röntgenbeugung an…
This article presents the oxidation kinetics of Cu thin films in dry and wet oxygen at temperatures from 100 to 600 °C. Spectroscopic ellipsometry and reflectometry, which yield refractive index and thickness of the Cu oxide, were used in kinetic study of Cu film oxidation. Cabrera–Mott (C–M) theory was used for the c…
Surface wetting measurements and several analytical techniques including FTIR/ATR, DSC, TGA, and pyrolysis-GC/MS are used to characterize the noncellulosic components of developing cotton fibers as intact components of the fiber structure. Water contact angle measurements are most sensitive to the presence of hydropho…
Glass-forming liquid crystals combine the ability of liquid crystals to self-organize and that of polymers to undergo glass transition (instead of crystallization) upon cooling. Here is reported the synthesis and implementation of novel right- and left-handed chiral-nematic glass-forming liquid crystals in optical not…