Materials Literature
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The corrosion potential fluctuations of aluminum alloy AA 6351 electrodes in 0.5 M chloride solutions were recorded both in the absence and in the presence of the following inhibitors: 2‐mercaptopyrimidine, sodium molybdate, and sodium nitrate. The corresponding spectral density plots, calculated over a wide frequency…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal thickening and thinning processes in low molecular-weight poly(ethylene oxide) fractions crystallized from the melt. 3. Molecular weight dependenceStephen Z. D. Cheng, Jianhua Chen, Jeffrey S. Barley, Anqiu Zhang, Anton Habenschuss, and Paul R. ZschackCite this: M…
We recorded 13C NMR spectra of type I and IV collagens in the anhydrous and hydrated states, in order to confirm our previous assignment of peaks, and to analyze the mode of partial renaturation of soluble collagens by hydration, as well as rapid intramolecular motions such as ring puckering in proline or hydroxyproli…
A technique is demonstrated that improves the substrate spatial distributions of resistivity and film thickness of transparent conducting oxide thin films prepared using a conventional dc planar magnetron sputtering method. The spatial distributions of Al-doped ZnO (AZO) films are markedly improved by deposition onto…
Abstract Crystal growth rates of spherulites of β‐phase poly(propylene)s and of an ethylene/propene block copolymer, crystallized from the melt, have been investigated in the temperature range of 122 to 146°C. On the basis of the regime theory, a transition between regime II and III is found at Δ T ≈ 37–43,5 K. The nu…
Abstract A study has been made comparing the utility of fractal and Euclidean geometry in the characterization of carbon-black aggregates. The fractal models used were the perimeter-area relationship, P∼A D p /2 , and the mass fractal, M∼R D m . Values of the perimeter fractal, D p , and the mass fractal, D m , were d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of transition-metal dimers: titanium-vanadium( TiV), vanadium dimer, titanium-cobalt (TiCo), and vanadium-nickel (VNi)Eileen M. Spain and Michael D. MorseCite this: J. Phys. Chem. 1992, 96, 6, 2479–2486Publication Date (Print):March 1, 1992Publication History…
Abstract The rate coefficients of thermal decomposition of peroxyacetic nitric anhydride (PAN) and peroxymethacrylic nitric anhydride (MPAN) were measured over the temperature range 302–323 K. The resulting Arrhenius expressions were k = 10 17.4±0.4 exp(−28.5 ± 0.5/ RT ) for PAN, and k = 10 16.2±0.7 exp(−26.8 ± 1.0/ R…
Abstract Amorphous poly(vinylpyrrolidone) (PVP) varying in molecular weight (MW) (10 000, 24 000, and 40 000) was used to study the effect of molecular weight on the glass transition temperature ( T g ). T g was measured by differential scanning calorimetry (DSC). Blends with several diluents (water, butylamine, glyci…
The microstructural changes produced by large (38 to 53 μ m), single‐crystal ZrO 2 inclusions (0, 0.09, 0.30 volume fractions, based on solid volume) within an Al 2 O 3 powder matrix were detailed as a function of constrained densification. Composite powder compacts were produced by pressure filtration for conditions…
The electrochemical impregnation of porous nickel sintered plates has been investigated to gain a better understanding of the structure, texture, and composition of the deposited active material. It was found that the nature of this material depends on the temperature of the impregnation bath. Below 60°C, an α‐type ni…
Amorphous carbon thin films were prepared at 30, 200, and 450 °C by magnetron sputtering of a graphite target. The surface structure and chemical bonding (sp2/sp3) of the carbon films were characterized by scanning tunneling microscopy (STM) and Raman spectroscopy. STM images show that graphite microcrystallites of 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic studies of a syn-anti carboxylate-bridged helix-like chain copper(II) complexEnrique Colacio, Jose Manuel Dominguez-Vera, Jean Pierre Costes, Raikko Kivekas, Jean Pierre Laurent, Jose Ruiz, and Markku SundbergCite this: Inorg. Chem. 1992, 31, 5, 774–7…
An overview of the studies of vibronic transitions in the rare earth ions is given with special attention to the intraconfigurational transitions. First the general theory is shortly reviewed, later that of the rare-earth vibronic transitions. The vibronic spectroscopy of Gd3+ is extensively dealt with, because it is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and UV-visible properties of soluble α-thiophene oligomers. Monomer to octamerJames M. Tour and Ruilian WuCite this: Macromolecules 1992, 25, 7, 1901–1907Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1…
A cell suspension culture of tobacco (Nicotiana tabacum L.) was used as a model to study injury to cells during biolistic transformation. Lawns of cells were bombarded with tungsten particles that were coated with a plasmid containing the beta-glucuronidase and the neomycin phosphotransferase II genes. When a gunpowde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemicrystalline morphology of poly(aryl ether ether ketone)/poly(ether imide) blendsSteven D. Hudson, Don D. Davis, and Andrew J. LovingerCite this: Macromolecules 1992, 25, 6, 1759–1765Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of poly(butylene terephthalate) and its blends with polyarylateJ. Runt, D. M. Miley, X. Zhang, K. P. Gallagher, K. McFeaters, and J. FishburnCite this: Macromolecules 1992, 25, 7, 1929–1934Publication Date (Print):March 1, 1992Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the crystal phase and crystallization rate of bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Mariastella Scandola, Giuseppina Ceccorulli, Maria Pizzoli, and Massimo GazzanoCite this: Macromolecules 1992, 25, 5, 1405–1410Publication Date (Print):March 1, 1992P…
Dendrite growth velocities have been measured as a function of undercooling in droplets of dilute alloys of B in Ni undercooled by up to 306 K using an electromagnetic levitation technique. At a critical undercooling, depending strongly on the B concentration, a steep rise of the dendrite growth velocity is observed.…