Materials Literature
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This paper reports a model for the relationship between critical debonding pressures and the work of adhesion of thin films in the blister test. Previous models have neglected the possible role of residual stresses in the film on the critical pressure. The model reported here shows that these stresses may have a large…
The effects of grooved epoxy substrata on epithelial (E) cell behavior were studied in vitro and in vivo. V-shaped grooves, 10 microns deep, were produced in silicon wafers by micromachining, a process which was developed for the fabrication of microelectronic components. The grooved substrata were replicated in epoxy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal, mechanical, and morphological analyses of poly(2,6-dimethyl-1,4-phenylene oxide)/styrene-butadiene-styrene copolymer blendsP. S. Tucker, J. W. Barlow, and D. R. PaulCite this: Macromolecules 1988, 21, 6, 1678–1685Publication Date (Print):June 1, 1988Publication Hist…
Results are presented of the equilibrium forces between two molecularly smooth surfaces immersed in pure monodisperse polymer liquids or ‘‘melts’’: liquid polybutadienes of molecular weights ∼1000 and ∼3500, corresponding to n≈20 and n≈65 segments (monomer units) per molecule, respectively. The aims were (i) to establ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes with tetrapyrrole ligands. 50. Redox potentials of sandwichlike metal bis(octaethylporphyrinates) and their correlation with ring-ring distancesJohann W. Buchler and Bernd. ScharbertCite this: J. Am. Chem. Soc. 1988, 110, 13, 4272–4276Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew crystalline phase of (octaethylporphinato)nickel(II): effects of .pi.-.pi. interactions on molecular structure and resonance Raman spectraTheodore D. Brennan, W. Robert. Scheidt, and John A. ShelnuttCite this: J. Am. Chem. Soc. 1988, 110, 12, 3919–3924Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-17 nuclear magnetic resonance kinetic study of water exchange on the lanthanide(III) aqua ionsCedric Cossy, Lothar Helm, and Andre E. MerbachCite this: Inorg. Chem. 1988, 27, 11, 1973–1979Publication Date (Print):June 1, 1988Publication History Published online1 May 2…
Chloramphenicol acetyltransferase [acetyl-CoA:chloramphenicol O3-acetyltransferase; EC 2.3.1.28] is the enzyme responsible for high-level bacterial resistance to the antibiotic chloramphenicol. It catalyzes the transfer of an acetyl group from acetyl CoA to the primary hydroxyl of chloramphenicol. The x-ray crystallog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of metal complexes of spheroidal carbon shellsF. D. Weiss, J. L. Elkind, S. C. O'Brien, R. F. Curl, and R. E. SmalleyCite this: J. Am. Chem. Soc. 1988, 110, 13, 4464–4465Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published…
Characteristics of air-jet textured yarns are determined by the instability, linear density, and strength, together with structural properties such as loop size, loop frequency, and degree of entanglement. Such characteristics are affected by various process parameters and supply yarn properties. The effects of these…
The purpose of this study was to establish a flexible and economical system for designing well-fitting body contouring apparel with knitted elastomeric fabrics. The methods used consisted of a simple fabric test which measured the stretchability of elastomeric fabrics and then expressed their stretchability as a perce…
but the results suggest that other mechanisms may also be involved. All four amphiboles exhibited systematically higher ferric-ferrous ratios with increasing 6, of equilibration. Equilibrium R values were achieved relatively rapidly and could be readily restored to onginal values by treatment at the appropriate buffer…
A selection of furnace black carbons of varying surface area and industry type were heat treated in purified helium at 2700°C and the corrosion resistance was measured under conditions of oxygen evolution in 30% at 55°C. The extent of graphitization was determined qualitatively by x‐ray diffraction and by transmission…
The forced‐convective dissolution of sapphire into CaO‐MgO‐Al 2 O 3 ‐SiO 2 melts was investigated at 1450° and 1550°C. Spinel, MgAl 2 O 4 , formed on the sapphire under all conditions although the morphology of the spinel, which varied from individual particles to a complete layer, depended on the MgO content of the m…
Abstract Raman spectra were obtained from PdO, Rh 2 O 3 and PdRhO 2 thin films formed by oxidizing foil samples. Polarization measurements allow symmetry species assignments to be made for the lines from the corundum phase of Rh 2 O 3 and from PdRhO 2 , which has a delafossite structure.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of inorganic powders by time-wavelength resolved luminescence spectroscopyEdgar F. Paski and M. W. BladesCite this: Anal. Chem. 1988, 60, 11, 1224–1230Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988htt…
The interactions of very pure and practically 100% dense α‐SiC with nickel and iron at 850°C were investigated. Large reaction zones, consisting of carbon and silicides of Ni and Fe, were examined by microprobe analysis. By means of marker experiments, the diffusion mechanisms were investigated: only Ni and Fe migrate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecular reflectivity of neutrons by thin polymer filmsT. P. Russell, A. Karim, A. Mansour, and G. P. FelcherCite this: Macromolecules 1988, 21, 6, 1890–1893Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https:…
The blocking of dislocations at a slip barrier, such as a grain boundary, is modelled by considering, in the domain of distribution of dislocations ahead of the slip band, a small zone representing a locked source or the width of the boundary itself. The ‘friction stress’ in this small zone is calculated so that no in…
Tensile specimens of type 316L stainless steel with a grain size of 5.0 μm have been deformed at a constant strain rate of 10−3 s−1 over the temperature range 21–900°C and by differential strain-rate test technique over strain rates from about 10−5 to 10−3 s−1 at temperatures in the range 750–900°C. The normalized yie…