Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of superoxide with iron porphyrins in aprotic solvents. A high spin ferric porphyrin peroxo complexElizabeth McCandlish, Andrew R. Miksztal, Mario Nappa, Alice Q. Sprenger, Joan S. Valentine, John D. Stong, and Thomas G. SpiroCite this: J. Am. Chem. Soc. 1980, 102,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroemulsions, micelles, and vesicles as media for membrane mimetic photochemistryJanos H. FendlerCite this: J. Phys. Chem. 1980, 84, 12, 1485–1491Publication Date (Print):June 1, 1980Publication History Published online1 May 2002Published inissue 1 June 1980https://pubs.ac…
Abstract A detailed description of the morphology and the complex melting behavior of poly(ethylene terephthalate) crystallized isothermally in the range 100–245°C is presented. Double or single melting endotherms can deliberately be obtained by varying the heating rate in the differential scanning calorimeter (DSC).…
A recent theory of two-dimensional melting is applied to freely suspended liquid-crystal films with a tilt degree of freedom. As many as seven distinct phases are possible, including those we identify with smectic-$A$, -$B$, -$C$, and -$H$ liquid crystals. Some of these phases may survive when stacked to form bulk sme…
The kaolin minerals in the Amazon upland soils vary ranging from the well-crystallized triclinic/b-axis disordered kaolinite intermediate in a red yellow latosol and a red yellow podzolic soil to the disordered kaolinite/halloysite (7 Å) intermediate in a “Terra Roxa Estruturada” soil and a reddish brunizem. The parti…
Uranium aluminide powder production, fuel plate fabrication development, and irradiation performance of more than 1700 fuel elements during 10 yr of operational service at Idaho National Engineering Laboratory are discussed. The UAlx dispersion fuel system has performed well in extended service in the high flux test r…
A theoretical treatment is presented for the determination of the screw sense of a cholesteric substance in a Grandjean-Cano-wedge by observing the sample in a polarizing microscope. For comparison some experimental measurements are given
The controversial phase transitions in barium and bismuth were studied with a manganin coil sensor. The transition in barium proposed at 80 kbars by Bastide etal. was confirmed at 95 kbars. For bismuth, the transition reported first by Bridgman around 45 kbars was confirmed at 40 kbars, but that around 65 kbars could…
Abstract Lamellar single crystals of cellulose were obtained from dilute solutions of low‐DP cellulose triacetate, by deacetylation followed by precipitation. At temperatures between 150 and 160°C, pure cellulose IV II crystals were obtained whereas at temperatures between 90 and 150°C, hybrid crystals, having cellulo…
Observations of cathodoluminescence in ZnS single crystals using scanning transmission electron microscopy exhibit a dependence on crystal orientation indicating that about 20% of the signal originates in localized excitations. This figure can be explained in terms of energy transfer to valence excitations from energe…
Stress enhancement due to the migration of charges can be a critical factor in the design of solid insulation for high voltage DC systems. The effect of bulk currents on surface and internal charge accumulation is discussed; and equations are formulated which predict steady-state conditions in arbitrary configurations…
The extremely hydrolysis-sensitive compound (BS2)8, obtained by fusion of a mixture of B2S3 and S8 in vacuo (300/100°C), has been found by X-ray structure analysis to be a planar porphine analogue. A second synthetic route starts from pre-formed five-membered rings.
Polyethylene consists of crystalline parts and amorphous parts. Trap sites for electrons or ions exist on a boundary between them. Mechanical drawing or isothermal crystallization of a bulk from its melt provides increased trap sites due to change of morphology in crystalline lamellae. The trap sites for electrons mig…
Electrode kinetics of fuel oxidation on nickel and cobalt electrodes is discussed for three selected molten carbonate mixtures. The measurements were made using a potential step technique. The highest exchange current values were found on nickel anodes in all melts, and the highest of these values were found in the me…
Abstract Glauconite has been synthesized at low temperature by precipitation of Fe-hydroxides from Si-, Fe-, Al-, and K-containing solutions under reducing conditions. The compositions favorable for the synthesis at 20°C and pH 8.5 are 1 ppm Fe, 0.15 ppm Al, 13 ppm Si0 2 , 1000 ppm KC1, and 1000 ppm dithionite. The K-…
A number of materials which exhibit the relatively new discotic phase have recently been discovered. All of the materials known which show this type of phase have molecular structures that are flat and hexagonal in shape. In this current work, we have shown that a porphyrin compound, uro-porphyrin I octa-n-dodecyl est…
Steel corrosion has been investigated through polarization studies in aqueous systems of acid p H using a rotating disk electrode cell. does not change the Tafel slopes of the anodic and cathodic processes. The anodic curves are shifted toward more negative potentials mainly due to the decrease of the reversible poten…
Jack C Burfoot and George W Taylor 1979 London: Macmillan viii + 465 pp price £20 The authors have concentrated on ferroelectrics, polar materials which undergo a spontaneous polarisation capable of modification by an electric field. The first and rather larger part of the book is a basic treatment of the electrical,…
Graded-index antireflection (AR) surfaces can be developed on phase-separated optical-quality glass. These surfaces have a median damage threshold of 12 J/cm2 for 1-ns, 1.06-μm laser pulses which is 2.5 times higher than the threshold of thin-film AR coatings, and reflectivity ≲0.2%, comparable to thin-film coatings.
Senescence of isolated petals of Tradescantia is accompanied by a large increase in membrane permeability, and application of ethylene hastens the onset of this increase. There is a 1- to 2.5-hour lag between ethylene application and the onset of anthocyanin efflux (an indicator of increased membrane permeability). Si…