Materials Literature
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Abstract Mixed-layer clay minerals of illite-smectite, having smectite contents ∼25% and IS ordering, kaolinite-smectite, and a three-component variety with kaolinite-smectite-chlorite-like material are described from a Carboniferous paleosol in South Wales. The clays, which are restricted to particular horizons, are…
Molecular dynamics computer simulations were used to study surfaces of pure silica glass. The potentials used here were those previously established to model bulk silica and have been extended to study surface relaxation in a perfect vacuum. A large number of surfaces were made using different starting configurations;…
X-ray photoelectron spectroscopy analysis was performed on ion beam sputter deposited films of indium tin oxide as a function of O2 partial pressure during deposition. The oxygen partial pressure was varied over the range of 2.5×10−6–4.0×10−5 Torr. Changes in composition as well as in the deconvoluted In 3d5/2, Sn 3d5…
Three aspects of the interaction of a low energy electron beam with surface excitations are described. The long range dipolar scattering concentrates the inelastic electrons in a narrow lobe close to the specular reflection. The resulting spectra are quantitatively interpreted by the macroscopic dielectric theory in o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the molecular and electronic structures of (.mu.-oxo)bis[(5,10,15,20-tetraphenylporphyrinato)iron(III)] and (.mu.-oxo)bis[(7,8-dihydro-5,10,15,20-tetraphenylporphyrinato)iron(III)]Steven H. Strauss, Michael J. Pawlik, J. Skowyra, J. Rory Kennedy, Oren P. Anders…
The structural description, symmetry and diffraction properties of incommensurate modulated phases are revised using a real-space framework. The superspace formalism usually employed is reformulated using a practical description where no multidimensional geometrical constructions are needed. The incommensurate structu…
The various order-disorder-type models for crystals in the KDP (potassium dihydrogen phosphate) family are reviewed, beginning with the Slater-Takagi-Senko model, continuing with tunneling additions by Blinc and Svetina, and analyzing the pressure-induced tricritical point in the Slater-Takagi-Senko model. The possibi…
Interconnections will become the limit in performance and reliability at submicrometer dimensions. Long-distance interconnections are defined using models based on resistivity, and it is found that more than half of the interconnections will become categorized as such at 0.5-µm feature sizes. The resistivity of even l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of polymeric inhibitors for the control of crystal polymorphism. Induced enantiomeric resolution at racemic histidine by crystallization at 25.degree.CI. Weissbuch, D. Zbaida, L. Addadi, L. Leiserowitz, and M. LahavCite this: J. Am. Chem. Soc. 1987, 109, 6, 1869–1871P…
Vacuum melted electrolytic iron and alloys of Fe–P, Fe–Mn, Fe–Cr, Fe–Mn–P, and Fe–Cr–P were employed in a study of the effects of chromium and manganese on phosphorus segregation and intergranular embrittlement. The effects of carbon were examined by hydrogen-decarburization of the original low carbon (10–60 ppm) allo…
Abstract Polypyrrole is a promising positive electrode material for the application in secondary lithium cells. The elemental analysis performed on electrochemically prepared polypyrrole films indicates a specific capacity of 82 Ah/kg. This specific capacity can be cycled in half cell experiments for many hundred time…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation between poly(acrylic acid) and pyrene-labeled polyethylene glycol in aqueous solutionHideko Tamaru Oyama, Wing T. Tang, and Curtis W. FrankCite this: Macromolecules 1987, 20, 3, 474–480Publication Date (Print):March 1, 1987Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure and magnetic properties of the adducts of copper(II) hexafluoroacetylacetonate with the nitroxide ligand 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxideD. Gatteschi, J. Laugier, P. Rey, and C. ZanchiniCite this: Inorg. Chem. 1987, 26, 6…
Abstract X‐ray measurements of stretched crosslinked liquid‐crystalline side group polymers show that two types of orientation of the mesogenic groups relative to the polymer chains (parallel or perpendicular) are possible, depending on the structure of the polymer chain. For two liquid‐crystalline polymethacrylates w…
Decahedral multiply-twinned particles of Si, 60–80 nm in size, prepared by a gas evaporation method are studied by a high resolution electron microscope. A mismatch arising in packing five tetrahedra is accommodated by deforming plastically one of the tetrahedra by introducing a small angle grain boundary. A core regi…
It was recently reported (C-W. Chen et al., FEBS Lett. 168, 70 (1984)) that water solutions of Mn3+ (TPPS4) have a surprisingly high relaxivity at 20 MHz and 37 degrees C, greater than most Mn2+ complexes including the hexaaquoion. Because Mn3+ (TPPS4) is highly stable, and porphyrins in general are tumor-seeking, we…
SUMMARY Stability changes during ageing (sterile) or incubation (non‐sterile) of both natural field aggregates and remoulded aggregates from five soils were studied for periods up to 30 days. Growth of fungal hyphae, estimated by ergosterol measurement, corresponded to temporary stability increases in both types of ag…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMathematical modeling of biofilm on activated carbonH. Ted. Chang and Bruce E. RittmannCite this: Environ. Sci. Technol. 1987, 21, 3, 273–280Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://pubs.acs.org…
Magnetic resonance imaging provides a method of visualizing multiple sclerosis plaques, but the age and activity of these plaques cannot be determined with routine magnetic resonance images. Gadolinium DTPA is a paramagnetic contrast agent that does not cross an intact blood-brain barrier. We studied 16 patients with…
Fine crystals of Si having spherical shapes of less than 200 nm, as well as hybrid particles of Si and β-SiC were prepared by a gas evaporation method using an arc discharge as the heat source. Si particles always contain stacking faults and twins which are categorized as growth faults. All the planar faults in a part…