Materials Literature
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Abstract Surface‐enhanced Raman scattering (SERS) of α‐toluenethiol adsorbed on a silver surface has been investigated. The controversial vibrational assignment of the molecule was refined by comparing the SERS spectra with the ordinary Raman spectra of α‐toluenethiol, α‐toluenethiolate, benzyl chloride and their deut…
Abstract The crystal orientation of solid‐state biaxially drawn solution‐crystallized ultra‐high‐molecular weight polyethylene (UHMW‐PE) film has been revealed from flat‐plate wide‐angle x‐ray scattering (WAXS) patterns and interpreted in terms of crystal plasticity. A slightly drawn film (λ ≤ 3 × 3) possesses only a…
The Cahn-Hilliard theory of phase separation by spinodal decomposition has been extended to include hydrodynamics caused by surface tension. Numerical solutions for phase separation in binary polymer mixtures in two spatial dimension are presented. The surface tension influences the growth rate of the average domain s…
Pipe diffusion along a dissociated edge dislocation in copper is investigated by molecular dynamics simulation. The formation energies of a vacancy and an interstitial in the cores and the fault ribbon are calculated by quasi-dynamics relaxation at 0 K. The diffusion rates of these defects are calculated at high tempe…
Abstract Polyether sulfones containing perfluoroalkyl segments were prepared by room temperature radical‐cation polymerization (Scholl reaction) of 1,4‐bis[4‐(1‐napthoxy)phenylsulfonyl]perfluorobutane ( 1a ) and 1,8‐bis [4‐(1‐napthoxy) phenylsulfonyl] perfluoroctane ( 1b ) in nitrobenzene, using anhydrous ferric chlor…
Stannous fluoride (SnF2) has been shown to be an effective caries preventive agent. After topical treatment of enamel surfaces, two reaction products have been demonstrated to precipitate on the surfaces, a larger type of globules, probably a calcium fluoride like product, and a smaller type of globules, probably a ti…
Abstract Diffuse reflectance infrared (IR) spectra show that pressing kaolinite into pellets for transmission IR studies changes relative intensities of hydroxyl peaks between 3700–3600 cm -1 . The magnitude of change depends on the absolute pressure, the pressing time and whether a salt matrix is used. Pressing with…
Millions ofAmericans have some form of arthritis. The cumulative effects of aging can further negatively affect clothing dressing ease and the self-image of arthritics and elderly individuals. This research addressed clothing problems and solutions of nearly 800 Arizona residents with either rheumatoid arthritis or os…
Abstract The existing sets of additive electronic polarizabilities for alkali halides and alkaline earth chalcogenides are examined by evaluating the high frequency electronic dielectric constants and presenting a comparison with experimental data. The crystalline state values of polarizabilities are also compared wit…
Abstract The new brownmillerite‐related compound, LaSrCuGaO 5 , has been synthesized and characterized. It crystallizes in the orthorhombic non‐centrosymmetric space group Ima2. The unit cell dimensions are a = 16.383(1) Å, b = 5.5293(7) Å, c = 5.3275(6) Å. The structure is related to perovskite but contains ordered o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKeto-enol tautomerization in metal-acyl complexes: the enolization properties of bimetallic .mu.-malonyl compoundsJoseph M. O'Connor, Roger Uhrhammer, Arnold L. Rheingold, and Dean M. RoddickCite this: J. Am. Chem. Soc. 1991, 113, 12, 4530–4544Publication Date (Print):June 1…
Abstract The adsorption of aminotriazole, at its solution pH, with montmorillonite saturated with different cations has been studied. A pesticide-montmorillonite complex is formed through interlamellar cations which are not displaced. Aminotriazole is situated mostly as a polarized molecule around Mg 2+ and Zn 2+ cati…
The Long Duration Exposure Facility (LDEF) spacecraft represents the first controlled unidirectional exposure of high-fluence atomic oxygen on fluorinated ethylene propylene (FEP Teflon) and silicones. The atomic oxygen erosion yield for FEP Teflon was found to be significantly in excess of previous low fluence orbita…
Abstract Die metallisch glänzenden Verbindungen Sr 2 Sn 2 As 2 und Sr 0,87 Ba 0,13 Sn 2 As 2 wurden aus Schmelzreaktionen ausgehend von den Elementen erhalten. Sie kristallisieren trigonal rhomboedrisch, Raumgruppe R3m, Z = 3, mit den Gitterkonstanten: In den Kristallstrukturen der isotypen Verbindungen bilden dreibin…
The 7475 Al–0·7Zr (wt-%) cold rolled alloy sheet fabricated by powder metallurgy exhibited remarkable superplasticity for strain rates between 2×10−3 and 3×10−1 s−1 at 793 K. During the initial deformation stage, the strain rate sensitivity m increased with increasing strain and attained a value greater than 0·5 after…
We discuss the role of both primary and secondary order parameters in a transition between two solid phases. We show how microscopic distortions which appear at the transition can be calculated using group-theoretical methods. We also show how the form of the coupling term in the Landau free energy influences the beha…
The concept of the capacitance of a gaseous void is discussed as applied to electrical insulation science. The most pertinent aspect of the capacitance definition is that of reference to a single-valued potential difference between surfaces. This implies that these surfaces must be surfaces of equipotential. With this…
Modulated reflection spectra of passive films on Fe‐20Cr‐25Ni alloy have been measured in 1 kmol · m −3 (pH 0.1), 1 kmol · m −3 (pH 2.0, 6.0, and 9.5), and 0.1 kmol · m −3 (pH 13.1) solutions, respectively. Quantitative relations between the characteristic of spectra and the composition of the films have been derived…
Abstract Riet veld X-ray powder diffraction (XRD) analysis has been evaluated as a procedure for characterizing Al-substituted goethite according to the Rietveld scale factor, unit-cell parameters, and atom positional parameters. The study was conducted with three synthetic goethite samples for which the degree of Al…
Qualitative and quantitative analysis of nanogram amounts of substances by transmission infrared spectroscopy with the use of silver island films was carried out. The effect of silver thickness, the comparison of several plates (Ge, BaF 2 , and ZnSe), the dynamic range of intensity enhancement vs. sample amount, and t…