Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and chemical properties of 1,3-cyclodisiloxanesMichael J. Michalczyk, Mark J. Fink, Kenneth J. Haller, Robert West, and Josef MichlCite this: Organometallics 1986, 5, 3, 531–538Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Pub…
Wrinkles in six aged persons (67-82 years of age) have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). There are two types of wrinkles. One is a deep wrinkle which develops on the sun-exposed skin and does not disappear on stretching (permanent wrinkle). The LM and SEM showed less el…
Abstmct-There is little or no definitive data in the literature that addresses the question of the possibility of adverse bioeffects in a single biological cell due to diagnostic ultrasound. A formula is derived that predicts the conditions that will produce transient acoustic cavitation on the scale of a single biolo…
Abstract Fine clay, coarse clay, and silt fractions of four Bangladesh soils were studied using XRD, ion exchange, and selective dissolution techniques. Constants for the XRD intensity-weight proportion relationships were derived using these techniques. Smectite and mica were found to be dominant in Batra and Ghior so…
Abstract A kinetic study of crystallization of fractions of poly(ethylene oxide)s between 3500 and 5,000,000 MW and their mixtures from the melt by differential scanning calorimetry and optical microscopy is reported. For the fractions the crystal growth rate is inversely dependent on the logarithmic molecular weight.…
The tetragonal ( t ) and cubic ( c ) ZrO 2 solid solutions in two‐phase ZrO 2 ‐8 wt% Y 2 O 3 ceramics have low and high solute content, respectively. Annealing samples sintered at 1600°C between 700° and 1400°C requires a change in the volume fraction of the coexisting phases, as well as their equilibrium Y 2 O 3 cont…
In order to probe the nature of the reactive site generated by acoustic cavitation, several new chemical dosimeters have been de- veloped and the effects of physical conditions on their yields have been explored. Specifically, the effects of solution vapor pressure and dosim- eter vapor pressure on sonochemical reacti…
This paper reviews work performed in the author’s laboratory on the roles that corrosion products play in corrosion and materials degradation processes. Subject areas include the following: (1) wedging action, in which the tensile stresses required for crack propagation are generated by the formation of solid corrosio…
Annealing of ZrO 2 ‐toughened Al 2 O 3 (ZTA) at elevated temperatures causes growth of both the intergranular ZrO 2 particles and the Al 2 O 3 “matrix” grains. Exaggerated (“breakaway”) grain growth occurs in some, but not all, specimens. Analytical electron microscopy of two ZTA's, both of which contained a continuou…
Abstract High‐pressure sorption (up to 50 atm) for CO 2 , N 2 , and Ar in poly(vinyl benzoate) (PVB) was studied at temperatures from 25 to 70°C by a gravimetric method utilizing an electromicrobalance. The results are described by Henry's law above the glass transition temperature T g for all gases. The dual‐mode sor…
Fully stabilized cubic ZrO 2 single crystals containing various Y 2 O 3 concentrations were deformed at 1400°C in air. The orientation chosen favored (001)(110) slip, which was confirmed by slip‐trace analysis and transmission electron microscopy; (111)(110) slip could also be activated. The yield and flow stresses in…
The microstructure and the mechanical properties of hot‐pressed tetragonal ZrO 2 polycrystals (TZP) reinforced with up to 30 vol% SiC whiskers were studied. The SiC whisker‐TZP composites were stable under the hot‐pressing conditions at 1450°C. Annealing in an oxidizing atmosphere at ∼1000°C resulted in glass formatio…
Abstract Thermal analysis is used to elucidate the fusion of fractions of poly(ethylene oxide) of from 3500 to 5000000 molecular weight. In addition, the equilibrium and nonequilibrium phase diagrams of binary mixtures of these fractions have been studied. Complete segregation from high‐molecular‐weight polymer is pos…
Preliminary results of a theoretical study of lattice defects in cubic zirconia are presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect SIMS observation of methylidyne, methylene, and methyl intermediates on a nickel(III) methanation catalystMark P. Kaminsky, Nicholas. Winograd, Gregory L. Geoffroy, and M. Albert. VanniceCite this: J. Am. Chem. Soc. 1986, 108, 6, 1315–1316Publication Date (Print):Marc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the degradation of electrical conductivity in polypyrroleLynne A. Samuelson and Mark A. DruyCite this: Macromolecules 1986, 19, 3, 824–828Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-valent iron porphyrins: synthesis, x-ray structures, .pi.-cation radical formulation, and notable magnetic properties of chloro(meso-tetraphenylporphinato)iron(III) hexachloroantimonate and bis(perchlorato)(meso-tetraphenylporphinato)iron(III)Pierre. Gans, Georges. Buis…
Mechanisms of failure in a transformation‐toughened MgO‐partially‐stabiltzed ZrO 2 are identified using in situ observations. The observations are related to measured stress‐strain curves, strengths under various loading conditions, strength degradation from surface damage, and comparative strengths and toughnesses of…
Transformation plasticity in ZrO 2 ‐containing ceramics generally exhibits shear and dilatation effects of comparable magnitude. The coupling between external stresses and crystallographic strains assists the tetragonal‐monoclinic transformation, which, via shear localization, gives rise to macroscopic shear and dilat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR of chromium(3+) in tris(acetylacetonato)gallium(III) single crystalsG. Elbers, S. Remme, and G. LehmannCite this: Inorg. Chem. 1986, 25, 7, 896–897Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pu…