Materials Literature
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Dielectric properties of CaNdAlO/sub 4/, LaAlO/sub 3/, SrLaAlO/sub 4/, SrLaGa/sub 3/O/sub 7/, and NdGaO/sub 3/ monocrystals, prospective substrate materials for the deposition of thin films of high-temperature superconductors, were measured with high accuracy at frequencies up to 40 GHz in the temperature range 10 to…
Raman microline focus spectrometry (MiFS) has been used to show that hydrogen containing amorphous carbon (a-C-H) films are readily annealed by a focused argon ion (514.5 nm) laser operating at a power typical of that used for conventional Raman microscopy. The annealing process produces microcrystallites of disordere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and defects in discotic crystals and liquid crystals as revealed by electron diffraction and high-resolution electron microscopyI. G. Voigt-Martin, R. W. Garbella, and M. SchumacherCite this: Macromolecules 1992, 25, 2, 961–971Publication Date (Print):January 1, 19…
The authors present an analytical calculation of the neutral particle distribution and its effects on ion heat and momentum transport in three-dimensional plasmas with arbitrary temperature and density profiles. A general variational principle, taking advantage of the simplicity of the charge exchange (CX) operator, i…
Use of ultra-high strength polyethylene (UHSPE) fibers in composites has been limited by problems with adhesion to the matrix. In this study we present a gas plasma treatment of UHSPE fibers (Spectra 900™ and 1000™) to improve adhesion in poly(methyl methacrylate). The gases used were nitrogen, argon, and carbon dioxi…
Four new glucosides, bungeiside-A, -B, -C, and -D, were isolated from the roots of Cynanchum bungei Decne. The structures of the new compounds were determined by chemical and spectroscopic methods, including two-dimensional nuclear magnetic resonance (2D NMR) techniques, especially 1H-detected heteronuclear multiple-b…
The treatment of certain cases of corrosion in living environments involves the consideration of two quite different disciplines, namely biology and corrosion. Either one or the other will be preponderant, according to the problem and the circumstances, and the two aspects are not necessarily permanently interdependen…
Abstract A series of substituted 2-hydroxychalcones (HC) were prepared, most of which underwent efficient and clean photochemical conversion into flavylium cations (FV) in acidic solution and polymer film, although strongly dependent on the pH and medium conditions as well as the HC structures. 4′-Methoxy and 4′-dimet…
Thin films of octaalkyl-substituted phthalocyanines were prepared by spin coating. The films were remarkably smooth and showed optical absorption spectra with Davydov splitting, characteristic of crystalline order, similar to those of structurally related compounds prepared by the Langmuir–Blodgett technique. The crys…
A spectroscopic method has been used to determine the number of coordinated water molecules bound to the central lanthanide ion in a series of polyaminopolycarboxylate complexes. It was found that in complexes of simple polyaminotricarboxylates, almost 4 waters of hydration were bound at the inner coordination sphere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface selectivity in blending polyethylene-poly(ethylene glycol) block cooligomers into high-density polyethyleneDavid E. Bergbreiter and B. SrinivasCite this: Macromolecules 1992, 25, 2, 636–643Publication Date (Print):January 1, 1992Publication History Published online1…
The effect of hydrostatic pressures on thermoelastic martensitic transformations in aged Ti-51at%Ni and ausaged Fe-31.9Ni-9.8Co-4.1Ti (at%) shape memory alloys has been investigated by electrical resistivity measurements under hydrostatic pressures up to 1.5 GPa. The results obtained were as follows: Transformation te…
Tensile deformation and heating experiments have been made in a high voltage electron microscope in order to clarify the mechanism controlling partial dislocation motion in a Fe–Mn–Si shape memory alloy. It is found that a small angle boundary composed of three types of perfect dislocations acts as a dislocation sourc…
In standard Mott electron polarimetry using thin gold film targets, extrapolation procedures must be used to reduce the experimentally measured asymmetries A to the values they would have for scattering from single atoms. These extrapolations involve the dependence of A on either the gold film thickness t or the maxim…
Incorporation of polymers, such as polyethylene glycol (PEG-lipid derivatives, or glycolipids, such as monosialoganglioside GM1; into liposomes results in sterically stabilized liposomes which have several advantages over liposome formulations traditionally used in the past, including reduced recognition and uptake by…
The performance of high-value-added synthetic-fiber products is greatly affected, not only by the properties of the polymer itself, but also by the fiber form and the structure of yarns and fabrics made from the fiber, which can be controlled for particular uses. This paper deals primarily with polyester-fiber fabrics…
Abstract The behaviour in propylene polymerization of catalysts containing ethyl benzoate/methyl p ‐toluate (EB/MPT) or dibutyl phthalate/triethoxy(phenyl)silane (DBP/EPS) as internal/external donor pairs was investigated. Comparing catalyst composition with performance, it appears that no qualitative difference exist…
Polyethylene oxide and polyethylene glycols can be inserted into MPS3 layered materials preintercalated with hydrated metallic cations.
The interaction of IrCl3(tht)3, tht = tetrahydrothiophene, and mesityl (2,4,6-trimethylphenyl, mes)-magnesium bromide in diethyl ether gives Ir(mes)3 as a very air-sensitive crystalline solid. Interaction of partially dehydrated IrCl3 with mesityllithium in Et2O gives the air-stable, paramagnetic Ir(mes)4. Interaction…
Several aluminas were synthesized from aluminium isopropoxide using some organic complexing agents as solvents. The difference in the properties, especially specific surface area, of the aluminas obtained was investigated. The thermal behaviour of the aluminas depended on the complexing abilities of the solvents used.…