Materials Literature
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Abstract Expansion of the porphyrin π-system by peripheral substitution lowers the oxidation potential of the macrocycle and increases the photocurrent quantum yield obtained when the porphyrin is used as sensitizer in a photocell. Tetrabenzporphyrins fall among the most efficient porphyrin sensitizers studied so far…
Pressure vessels for coal conversion processes are likely to be made of a 2 1/4 Cr-1Mo steel, covered by ASTM specification A387, class 2, grade 22. Under the projected operating conditions, degradation of the mechanical properties of the steel by temper embrittlement and hydrogen embrittlement is a major concern. The…
Several fluoroalcohols have been prepared by the free-radical addition of methanol, ethanol and isopropanol to such fluoro-olefins as C3 F6, CFH[dbnd]CF-CF3, (CF3)zCFCF[dbnd]CFCF3 and H(CF2)4CF[dbnd]CF2. Proper experimental conditions for their synthesis are described. Owing to their strong tendency to form hydrogen b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of inorganic molecules. 31. Satellite structure associated with the core-electron binding energies of alkyl and aryl isocyanide complexes of the transition metalsW. S. Mialki and R. A. WaltonCite this: Inorg. Chem. 1982, 21, 7, 2791–2796Publicatio…
Efficiency loss due to high electron beam current density in green‐emitting phosphors has been measured for Cu and Al concentrations ranging from 27 to 1500 ppm. The severe loss of efficiency exhibited by commercial phosphors with activator concentrations in the 20–75 ppm range is somewhat alleviated at higher concent…
Abstract Results are presented for the relaxation of the nuclear magnetization via quadrupolar inter-actions caused by the dynamics of point-like lattice defects in cubic solids. For systems with nuclear spins I = 3/2, several aspects of the lineshape function of the absorption signal are con-sidered. The treatment in…
To determine a stress distribution due to ball-point scratching, we have observed, using a scanning electron microscope, domain structures on the top and bottom surfaces at 3% Si-Fe single crystals with orientation near
Proposes a formalism which allows one to consider the whole reflected waves at the interfaces of an helical pile of transparent plates with rectilinear birefringence (Reusch pile). This formalism is applied to a half infinite pile, illuminated in the direction of the screw axis by monochromatic plane and uniform waves…
Abstract Product composition of polyglycerol esters, prepared from a direct alkaline polymerization of glycerol followed by esterification with stearic or oleic acids, has been studied. The internal product composition, as analyzed by high performance liquid chromatography (HPLC), shows clearly that in contradiction t…
Abstract Für verschiedene Proben von Polyethylen wurden die Dicken der Lamellen durch photometrische Ausmessung von elektronenmikroskopischen Aufnahmen höherer Vergrößerung bestimmt. Es werden Werte für das Lamelleninnere, die Gesamtdicke der Lamelle, eine mittlere Lamellendicke und die Grenzschichtdicke angegeben. Ei…
Actin and actin-binding protein (ABP) have recently been purified from human platelet cytoskeletons (S. Rosenberg, A. Stracher, and R.C. Lucas, 1981, J. Cell Biol. 91:201-211). Here, the effect of ABP on the sedimentation of actin was studied. When ABP was added to preformed F-actin filaments, it bound until a maximum…
The forbidden reflection intensity from crystals containing the two-fold screw axis depends strongly on the incident beam direction, and this influences the contrast of crystal structure image. Taking cementite (Fe 3 C, orthorhombic, Pbnm ) as an example, intensity calculation and image simulation have been made. It i…
Abstract Three kinds of aminimide compounds were examined as latent hardeners/promotors for epoxy resins. Since aminimides are thermolyzed to generate tertiary amine and isocyanate, the compounds are useful as polymerization initiators for the epoxy group as well as promotors for epoxy–acid anhydride reaction. The pot…
Laser excited photoluminescence of InSe single crystal shows three peaks at 1.311, 1.272, and 1.227 eV. The relative intensity of these peaks variation from point to point on the surface of the crystal. The high-energy peak is assigned to impurity to band transitions, the 1.277 eV to donor-acceptor type transition and…
As in conventional high temperature technology, the qualification of metallic materials for high temperature reactor (HTR) applications is based on creep behavior, fatigue properties, corrosion resistance, and thermal stability. Of specific interest are the effects of the primary coolant helium, which contains trace i…
Abstract The environmental stress crazing and cracking (ESC) behavior of an aromatic polyetherimide (PEI) has been characterized in a wide spectrum of organic liquids and compared to the behavior of several other glassy thermoplastics. PEI's response is qualitatively similar to that of the other resins for each of whi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of low molecular weight block copolymers. 4. Differential scanning calorimetry and refractive index-temperature measurement on styrene-butadiene diblock copolymers and styrene-butadiene-styrene triblock copolymersSonja Krause, Zhonghe Lu, and Magdy IskandarCite th…
The specific heat of antiferromagnetic ${\mathrm{Cs}}_{2}$Fe${\mathrm{Cl}}_{5}$ \ifmmode\cdot\else\textperiodcentered\fi{} ${\mathrm{H}}_{2}$O between 1 and 30 K is reported. The long-range ordering temperature is 6.54\ifmmode\pm\else\textpm\fi{}0.02 K. A careful examination of the possible superexchange paths, and th…
Abstract The degree of dispersion of carbon black in rubber is known to be a determining factor in the physical properties of the composite. It is important, therefore, to have a reliable, quantitative technique for assessing carbon black dispersion. It has been known for some time that the degree of dispersion of car…
Hot‐pressed Si 3 N 4 materials containing 1 and 5 wt% MgO were oxidized for 1000 h at 1000°, 1100°, and 1200°C in helium at 0.4 to 0.8 Pa total oxidants. Transition from passive to active oxidation occurred between 1000° and 1100° C, in agreement with published theoretical calculations for pure Si 3 N 4 . The amounts…