Materials Literature
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Abstract Poly(ether ether ketone) (PEEK)/poly(phenolphthalein ether sulfone) (PPES) block copolymers were synthesized by a condensation reaction of fluorine‐terminated PEEK oligomers and hydroxy‐terminated PPES oligomers. The content of PPES in the copolymers was varied from 12 to 44 wt.‐%, and the effect of the compo…
Abstract Microscopy techniques for direct visualization of phases in polymer blends are reviewed. Light microscopy is suitable for immiscible blends and contrast techniques include polarized light, phase contrast, differential interference contrast, and fluorescence. Each technique has an application for a particular…
Abstract The crystal structure of a tris(dithiolene)vanadium(IV) complex, [V(S2C2H2)3] (1), was determined. This complex shows the first instance of the nearly perfect D3h geometry in tris(dithiolene) vanadium(IV) complexes. In comparison with 1, the crystal structures of (NEt4)2[V(bdt)3] (bdt2− = 1,2-benzenedithiolat…
A coating emulsion was prepared using maltodextrins, carboxymethylcellulose, propileneglycol and a mixture of s orbit an fatty acid esters with an HLB of 6. The emulsion was sprayed on fully mature, unripened manila mangoes, which were the stored at 15 and 25C and 80–85% R.H. At 25C it was observed that rate CO2 produ…
Quasiperiodic long-range order is intermediate between spatial periodicity and disorder, and the excitations in one-dimensional (1D) quasiperiodic systems are believed to be transitional between extended and localized. These ideas are tested with a numerical analysis of two incommensurate 1D elastic chains: Frenkel-Ko…
BACKGROUND: Abundant availability of homeotic mutants in Bombyx mori provides us with clues to study the body plan of the silkworm. Previous studies indicated that the ECa/ECa and EN/EN embryos, which reveal drastic morphological changes (Itikawa 1943, 1952) lack the homologue of abd-A and the homologues of abd-A and…
By using TEM and X‐ray diffraction, the domain structure in ceramic LaNbO 4 has been studied. It has been found that the domains have two different orientations, separated by a boundary with_irrational Miller indexes between (20) I / (402) II and (20) I /(602) II lattice planes, which is in good agreement with the bou…
Structure factors for small, hydrothermally grown samarium orthoferrite, SmFeO 3 , were measured with focused λ = 0.7 Å synchrotron radiation. Approximate high symmetry in the Δρ images indicates that cations deform the electron density far more strongly than the O atoms. The most obvious effect is on distribution of…
Abstract Pore-lining chlorite is common in Rotliegend lake shoreline aeolian sandstones from northern Germany and preserves abnormally high primary intergranular porosity. In the north of the study area, in a basinward direction, the chlorites are Mg-rich while towards the south they become Fe-rich over a distance of…
Abstract A quantification technique useful in analysis of clay-rich deposits containing sepiolite and/or palygorskite has been developed by combining diffractometric and chemical data and represents a considerable improvement on classic quantification based on X-ray diffraction. The required data are: intensity ratios…
Abstract The control of the morphology of an immiscible polymer melt is of vital importance for the mastering of the final properties of the product. As polymer blends are produced using corotating twin‐screw extruders, understanding and modeling the changes experienced by the blend during this process is of great int…
Abstract The deposition of electron beam‐induced specimen contamination in both the transmission (TEM) and scanning electron microscopes (SEM) has remained a problem since the beginning of these forms of microscopy. Generally, sources of SEM contamination can be attributed to one or a combination of three major contri…
The magnetocrystalline anisotropy energy of Y${\mathrm{Co}}_{5}$ has been calculated from first principles using the local-spin-density approximation. The easy magnetization axis is predicted correctly and the anisotropy energy is only 20% smaller than the experimental value if a recently proposed orbital polarization…
As part of an effort to understand the mechanisms of light-induced effects in a-Al2O3:C the phototransferred thermoluminescence (PTTL) peaks at ~260 K and at ~450 K have been monitored as a function of the time of illumination, the temperature to which the sample is heated between irradiation and illumination, the wav…
Abstract Single crystals of β‐Ga 2− x In x O 3 with x = 0 to 0.2 have been grown by the float zone technique using radiation heating. When x increases from 0 to 0.2, the interionic distance O‐Ga in the gallium octahedron and tetrahedron increase on the average by 1 to 1.5% and, as a consequence, the position of the st…
A new liquid crystalline photoconductor, 2-(4'-heptyloxyphenyl)-6-dodecylthiobenzothiazole exhibiting a smectic A (SmA) phase between 90° C and 100° C was synthesized and its photoconductive behavior was characterized by steady-state current-voltage measurements under ultraviolet illumination. A large photocurrent wit…
Abstract Crystallization Analysis Fractionation is a new technique for the analysis of composition distribution in semicrystalline polymers; more specifically for the analysis of branching distribution in Polyethylene and tacticity in Polypropylene type resins. CRYSTAF as well as TREF (Temperature Rising Elution Fract…
A determination of stacking fault energy (SFE) of the austenite phase of a duplex stainless steel, material no. 1.4462, has been carried out using transmission electron microscopy (TEM). Furthermore, cold rolling tests and microstructural analysis have been realized in order to allow a detailed discussion of the obtai…
Abstract The tripeptide glutathione (γ‐ L ‐Glu‐ L ‐Cys‐Gly, GSH) is thought to play an important role in the pharmacology of bismuth drugs, but to our knowledge no chemical studies of bismuth glutathione complexes have been reported. We report here studies of interactions of the antiulcer compound ranitidine bismuth c…
Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. A similar crystalline to highly disordered solid phase transition is reported in this study for two zeolites, scolecite and mesolite. Pressure-induced amorphization is demonstrated using in…