Materials Literature
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Abstract Bei der Hydroaminierung von Alkenen und Alkinen handelt es sich um Reaktionen, die auch 1999 noch nicht zum Standardwerkzeug der Organischen Chemie gehören. Viele der hier beschriebenen Verfahren sind auf einzelne Substratklassen oder sogar einzelne Substrate beschränkt, verwenden hochempfindliche und teure K…
Metastable amorphous ZrO 2 ‐Al 2 O 3 powders were hot‐pressed at low temperatures (873 and 923 K), under moderately high pressures (500 and 750 MPa), and amorphous pellets with 1%‐8% porosity were obtained. Crystallization of the amorphous pieces in the temperature range of 1173–1673 K produced a range of ultrafine mi…
Long bulky substituents do not affect the nonlinear optical properties of the octopolar system 1,3,5-trihydroxy-2,4,6-trinitrobenzene (THTNB), but lend it liquid crystal (LC) properties, as demonstrated here. The synthesis of this LC derivative (see Figure for structure) is described as are its thermal, mesomorphic, a…
Time-resolved fluorescence, particularly of millisecond lanthanide emission, is of considerable interest because of potentially increased sensitivity when short-lived autofluorescence is a problem. Lanthanides have also previously been shown to be excellent donors in resonance energy transfer measurements, where a lan…
A parallel-plate viscometer has been designed for use in an internally heated pressure vessel (IHPV) at pressures up to 350 MPa and at temperatures up to 900 ℃. The viscosity of a melt is determined by measuring the rate of deformation of a cylindrical sample as a function of an applied, constant stress at a fixed tem…
This is a study of electrode degradation mechanisms and reaction kinetics of LaNi 4.7 Sn 0.3 , La ( 1 − x ) Y x Ni 4.7 Sn 0.3 ( x = 0.1, 0.2, and 0.3) and La 0.7 Y 0.3 Ni 4.6 Sn 0.3 Co 0.1 metal hydride electrodes. Alloy characterization included X‐ray diffraction, X‐ray absorption (XAS), hydrogen absorption in a Siev…
Abstract Calcite production is understood largely as a longer—term phenomenon (e.g., seasonal whitings) that can occur in hardwater lakes, and is significant ecologically because it can slow the rate of eutrophication by reducing, through adsorption, the availability of nutrients to primary producers. In this study we…
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Using 2,6- and 2,4,6-alkyl-substituted sterically hindered primary amines, N-bonded silicon dichlorides RN(SiMe 3 )(Si(Me)Cl 2 ) (R = 2,6-Me 2 C 6 H 3 ( 1a ), R = 2,6- i -Pr-C 6 H 3 ( 1b ) and R = 2,4,6-Me 3 C 6 H 2 ( 1c ) have been prepared. Controlled hydrolysis of these dichlorides afforded the N-bonded silanediols…
Electron-energy-loss spectroscopy (EELS) in a high-resolution transmission electron microscope can be used to study the excitation of plasmons in nanometre-size particles with high spatial resolution. For isotropic particles of various shapes, models which allow the attribution of the experimental peaks to a certain e…
Surface relief associated with martensitic transformation—tetragonal‐to‐monoclinic phase transformation—that occurred during isothermal aging at temperatures of 400 and 473 K was observed via atomic force microscopy, using prepolished and thermally etched surfaces of zirconia–3 mol% yttria that was sintered at a tempe…
The deformation of both high density polyethylene and polypropylene undergoing equal channel angular extrusion (ECAE) has been investigated, and the resultant molecular orientation characterised by X-ray diffraction. The ECAE process using a 45° extrusion angle is found to result in permanent deformation only when a c…
Abstract Tris(acetylacetonate)ruthenium, Ru(acac)3, successfully reacts with the lacunary heteropolyoxometalate, K8[SiW11O39] under hydrothermal conditions (6 MPa nitrogen at 200 °C), to give the mono-substituted heteropolyanion, [SiW11O39Ru(III)(H2O)]5−. The heteropolyanion shows notable activity on the air oxidation…
Electronic and geometrical structures of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) molecules are studied using ab initio molecular orbital methods. The optimized structure of a BEDT-TTF monomer is close to the experimental one within errors of 0.02 Å and 0.5 deg in bond length and angle, respectively, except th…
Expression of Bcl-x protein was evaluated in hen ovarian follicles, relative to stage of development, and in cultured granulosa cells after treatment with various apoptosis-suppressing or -inducing agents. Using Western blot analysis, Bcl-X(LONG) was most frequently observed migrating as a doublet with a molecular mas…
The high rate discharge capability of the negative electrode in a Ni/MH battery is mainly determined by the charge transfer process at the interface between the metal hydride (MH) alloy powder and the electrolyte, and the transfer process in the bulk MH alloy powder. In this study, the anodic polarization curves of a…
The structural changes associated with the ferromagnetic (FM)/metallic to antiferromagnetic (AFM)/insulating transition of ${\mathrm{Pr}}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3} (I4/mc\stackrel{\ensuremath{\rightarrow}}{m}{P2}_{1}/n)$ are described in detail. Based on high-resolution neutron-diffraction data, in th…
Abstract Blends of polypropylene and polyamide‐6,6 have compatibilized with polypropylene that was carboxylated through a reactive extrusion process with an asymmetric functional peroxide. The compatibilized blends demonstrated a finely dispersed minor phase as shown by SEM. Because of the enhanced dispersion, additio…
A quantitative method for evaluating seam pucker in garment manufacturing is devel oped from three-dimensional image analysis using artificial intelligence. A laser scanning system created with a specially designed laser sensor measures the surface profile of seam pucker. Since the conventional AATCC rating system is…
Functionalization of triphenylene-based discotic liquid crystals by direct nitration of hexaalkoxytriphenylene has very recently been reported to produce exclusively the mononitrohexaalkoxytriphenylene. W e have found that nitration of such discotics is not restricted to only one ring of triphenylene, but all the thre…