Materials Literature
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A decagonal phase with a periodicity of 3·78 nm (= 3 × 1·26nm) along the periodic axis has been found for the first time in Al–Cu–Cr alloys in the as-cast state as well as in the annealed state. The temperature range of stability has been found to be very narrow around 1000°C by investigation of differently annealed s…
The photolytic decomposition in air of a polyimide film based on a dianhydride and a diarylamine with hexafluoroisopropylidene 6F bridging groups is extremely rapid, leading to efficient chain cleavage and subsequent photooxidative decomposition. Only relatively short photolysis times with an unfiltered medium-pressur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-organic chemical vapor deposition of copper and copper(I) oxide from copper(I)tert-butoxidePatrick M. Jeffries, Lawrence H. Dubois, and Gregory S. GirolamiCite this: Chem. Mater. 1992, 4, 6, 1169–1175Publication Date (Print):November 1, 1992Publication History Publishe…
We study phase ordering in nematic liquid crystals using cell-dynamics simulations for d=2, n=2, and d=3, n=3. The tail in the structure function decays as ${\mathit{k}}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\chi}}}$, with \ensuremath{\chi}=4.0\ifmmode\pm\else\textpm\fi{}0.1 for d=2 and \ensuremath{\chi}=5.3\ifm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly selective homocoupling reaction of allylic halides using barium metalAkira Yanagisawa, Hiroaki Hibino, Shigeki Habaue, Yoshiyuki Hisada, and Hisashi YamamotoCite this: J. Org. Chem. 1992, 57, 24, 6386–6387Publication Date (Print):November 1, 1992Publication History Pu…
In previous works, the authors found that substituted N-aryl-2,5-dimethylpyrroles are very effective inhibitors of iron corrosion in acid solutions. The efficiency of an inhibitor in protecting metals from corrosion is often associated with the molecular structure of the inhibitor as well as with the distribution of c…
The kinetic rate equation proposed by Mewis and Denn (1983) for their structural network model is found to predict accurately the large amplitude oscillatory shear behavior of molten low density polyethylene IUPAC X. Spectral analysis is used to compare the predictions of several kinetic rate equations. Frequency vers…
Three isoforms of human tyrosine hydroxylase were expressed in Escherichia coli and purified to homogeneity as the apoenzymes (metal-free). The apoenzymes exhibit typical tryptophan fluorescence emission spectra when excited at 250-300 nm. The emission maximum (342 nm) was not shifted by the addition of metal ions, bu…
Abstract The proton NMR assignments for a series of 12 thermo‐ and photochromic 1,3,3‐trimethylspiro(indoline‐2,2′‐benzopyrans) dyes is reported. All of the protons in the dye molecule were assigned through a combination of homonuclear decoupling experiments and correlation spectroscopy. The relative stereochemistry o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Conjugated metallabutadiyne complexes: synthesis, structure, and bondingJoseph Manna, Steven J. Geib, and Michael D. HopkinsCite this: J. Am. Chem. Soc. 1992, 114, 23, 9199–9200Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Publis…
Analytic asymptotic analysis and finite element numerical procedures are used to elucidate the mathematical reasons for the appearance of infinite-range oscillatory solutions to certain integral equation theories of wall–fluid interfacial structure and liquid state radial distribution functions. The results contribute…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA XANES-TPR study of platinum-rhenium/alumina catalystsFrank Hilbrig, Chris Michel, and Gary L. HallerCite this: J. Phys. Chem. 1992, 96, 24, 9893–9899Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992http…
The electrochemical properties of the high temperature three‐dimensional and layered phases are reported. Copper can be partially or completely removed from these compounds at room temperature by means of strong oxidizing agents. Upon removal of the copper several new compounds with copper content below the high tempe…
The ZrC‐coated UO 2 particle is a promising fuel for high‐temperature gas‐cooled reactors. Particle fuels with multiple layers of pyrolytic carbon and ZrC have been irratiation‐tested to a maximum fast‐neutron fluence exceeding 2 × 10 25 /m 2 ( E < 29 fJ). In‐reactor fission‐gas release measured at a burnup of 1.5…
The water vapor (WV) permeance of lipid and lipid‐hydrocolloid films exposed to relative humidity (RH) gradients of 100–0%, 100–50%, 100–65% and 100–80% RH were determined. The lipids used were beeswax (BW) or a blend of BW and acetylated monoglycerides (AG). Hydrocolloids used were methylcellulose, carboxymethylcellu…
An alternative procedure is developed to the smoothed linear fitting method of McDonald and Owen. The procedure is based on the detection of discontinuities by comparing, at any given position, three smooth fits. Diagnostics are used to detect discontinuities in the regression function itself (edge detection) or in it…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable modes of nickel(II) coordination with macrocyclic ligands based on 1,5-bis(2-mercaptoethyl)-1,5-diazacyclooctane (BME-DACO)Marcetta Y. Darensbourg, Ivan Font, Daniel K. Mills, Magdalena Pala, and Joseph H. ReibenspiesCite this: Inorg. Chem. 1992, 31, 24, 4965–4971Pu…
Direct write e-beam lithography and reactive ion etching was used to fabricate square-wave gratings in quartz substrates which serve as pure phase masks in the near-field holographic printing of gratings. This method of fabricating these masks extends the flexibility of the printing technique by allowing both abrupt p…
Abstract In the presence of a catalytic amount of bis(dipivaloylmethanato)manganese(II) (= Mn(dpm)2), various cholesterol derivatives are smoothly converted into the corresponding β-epoxides in good to high yields with combined use of molecular oxygen and isobutyraldehyde. These stereoselectivities are the reversal of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of alumina-pillared montmorillonite by surfactant modificationLaurent J. Michot and Thomas J. PinnavaiaCite this: Chem. Mater. 1992, 4, 6, 1433–1437Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 N…