Materials Literature
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A contact preparation is made between a cholesteric photocrosslinkable material and a standard nematic liquid crystal. The concentration and the anisotropy progressively and homogeneously vary along a direction perpendicular to the diffusion front. On the basis of scanning electron microscopy investigations, compariso…
The magnetoelectric effect of rare earth manganese oxides RMn2O5 (R = Eu, Gd, Tb, Ho, Er, Yb and Y) has been studied by a quasistatic magnetoelectric method for the purpose of determining whether linear magnetoelectric effect is present or not. The results indicate that the main part of the effect at 4.2 K is represen…
Abstract Emission Mössbauer spectra of the title compound measured below 80 K consist of three components ascribed to two Fe(II) high-spin states and one Fe(III) low-spin state. It was concluded that a part of the Fe(II) high-spin species converts to an Fe(III) high-spin species above 210 K, based on the comparison of…
The symmetry of current–voltage ( I–V ) characteristic of the metal–insulator–metal (MIM) element with the insulator of tantalum anodic oxidation TaO x which is heat-treated in hydrogen (hydrogen-treated) is greatly improved. Meanwhile, the symmetric I–V characteristic, unlike that of the conventional MIM element with…
Abstract Die Temperaturabhängigkeit der Zersetzungsdrücke der auf dem quasibinären Schnitt Bi 2 O 3 /BiI 3 existierenden ternären Verbindungen wurde durch Gesamtdruckmessungen mit dem Membrannullmanometer und dem Massenspektrometer ermittelt. Das Zustandsbarogramm für das System wurde aufgestellt und das Zustandsdiagr…
A series of novel bismaleimide (BMIs) resins were prepared from 4-maleimidophenyl isocyanate and oligoether diols and oligoester diols. All the BMIs were characterized by IR, 1H-NMR spectra and elemental analysis. DSC studies indicated that the thermal polymerization of the BMIs carried out in the 80–260°C range, and…
Incorporation of Nd into the BaCeO 3 perovskite structure was studied by quantitative wavelength dispersive spectroscopy‐electron probe microanalysis (WDS/EPMA) in combination with scanning electron microscopy (SEM) and X‐ray powder diffractometry (XRPD). Highly Nd‐doped BaCeO 3 specimens, synthesized by mixed oxide t…
Resilient silicone-matrix composites containing 7–13 volume percent nickel filaments (0.4 μm diameter) exhibited 74–93 dB electromagnetic interference (EMI) shielding effectiveness at 1–2 GHz and 1 × 10−1 – 2 × 10−2 Ω cm DC volume electrical resistivity. The high shielding effectiveness is due to the small diameter of…
Polycrystalline PbTiO 3 thin films having layered perovskite structure were fabricated by a sol–gel (spin coating) processing method. The substrates used were fused silica and stainless-steel. Surface morphology of the films was studied with scanning electron microscopy (SEM). The effect of post-deposition annealing o…
Internal friction ${(Q}^{\ensuremath{-}1})$ and Young's modulus have been studied on a series of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ and ${\mathrm{La}}_{0.6}{\mathrm{Y}}_{0.07}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3\mathrm{\ensuremath{-…
Octaisopropylchromocene: The First Chromocene with Gradual low spin/high spin ‐Transition Octaisopropylchromocene ( 1 ) exists in a low spin state at very low temperatures and undergoes a gradual spin transition on warming up. At 300 K a high spin state with four unpaired electrons has been found for solid 1 by invest…
Abstract The kinetics of the slow relaxation, or “first cycle effect”, observed during the cathodic reduction of a polyaniline film, were investigated with UV‐vis spectroelectrochemistry. It was shown, that the slow cathodic reduction of a polyaniline layer, present initially in its emeraldine state, can be accelerate…
The quinolone antibiotic premafloxacin crystallizes in at least five solid modifications, including three anhydrous phases (Forms I-III), a hydrate, and a methanolate. The anhydrous phases were studied by optical microscopy, X-ray powder diffraction, HPLC, hot-stage microscopy, dynamic moisture sorption gravimetry, di…
Using neutron and light scattering techniques, we studied, as a function of swelling degree in a good solvent, the fluctuations of polymer concentration in highly cross-linked gels prepared in the bulk. Using the method proposed by Pusey and Van Megen, we separated the total scattering intensity into the contributions…
Abstract Several iron(III) complexes with the different hexadentate Schiff-base ligands of N4O2 donor sets were synthesized; these are 1 : 2 condensation products of linear tetramines (3,3,3-, 3,2,3-, 2,3,2- or 2,2,2-tetramine) and salicylaldehyde, acetophenone or benzophenone derivatives. Their crystal structures, Mö…
In this paper we report on dynamic wetting studies on model rough surfaces. A series of well-defined model surfaces has been manufactured, and the dynamic wetting of silicone oil droplets on these surfaces has been studied. The surface structures are etched, parallel, V-shaped grooves with varying width and spacing. S…
The synthesis of the highly strained tris(α,α-bis(pentachlorophenyl)-2,4,5,6-tetrachlorotolyl)methane ( 8 ), which is the precursor of the first generation of the polyradical series III, has been achieved by exhaustive chlorination of compound 11 . Stepwise divergent synthesis, by successive Friedel−Crafts reactions,…
For an anisotropic Euclidean ${\ensuremath{\varphi}}^{4}$ theory with two interactions $[u({\ensuremath{\sum}}_{i=1}^{M}{\ensuremath{\varphi}}_{i}^{2}{)}^{2}+v{\ensuremath{\sum}}_{i=1}^{M}{\ensuremath{\varphi}}_{i}^{4}]$ the $\ensuremath{\beta}$ functions are calculated from five-loop perturbation expansions in $d=4\e…
Other| December 01, 1997 Comparison of the crystal chemistry of selected MSi 6 O 15 -based silicates S. M. Haile; S. M. Haile California Institute of Technology, Materials Science Department, Pasadena, CA, United States Search for other works by this author on: GSW Google Scholar B. J. Wuensch B. J. Wuensch Massachuse…
Uniformly ground Sm 2 Fe 17 N x fine powders with high-performance permanent magnetic property and oxidation resistance characteristics were obtained from the coarse powders by ball milling in an organic solution containing a surfactant and surface modification for them, followed by fabrication of their bonded magnets…