Materials Literature
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Basanitic glasses with known dissolved C concentrations have been analyzed using infrared spectroscopy to calibrate the molar absorptivity of carbonate. C is dissolved as carbonate complexes in the glass resulting in absorption bands at 1525 and 1425 cm−1. Molar absorptivities of 283 ± 8 L/(mol·cm) were determined for…
The place of epicontinental waters in global ecology, R. Margalef phytoplankton - which, and how much?, J. Capblancq and J. Catalan prokaryotology for the limnologist, C. Pedros-Alio and R. Guerrero macrophytes, taking control of an ancestral home, C.M. Duarte et al interannual variability in limnic ecosystems - origi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN2 Cleavage by Three-Coordinate Group 6 Complexes. W(III) Complexes Would Be Better Than Mo(III) ComplexesQiang Cui, Djamaladdin G. Musaev, Mats Svensson, Stefan Sieber, and Keiji MorokumaCite this: J. Am. Chem. Soc. 1995, 117, 49, 12366–12367Publication Date (Print):Decembe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDramatic Stabilization of a Hexagonal Columnar Mesophase Generated from Supramolecular and Macromolecular Columns by the Semifluorination of the Alkyl Groups of Their Tapered Building BlocksV. Percec, D. Schlueter, Y. K. Kwon, J. Blackwell, M. Moeller, and P. J. SlangenCite…
The evolution of structural parameters characterizing the semicrystalline morphology of poly(aryl-ether-ether-ketone) (PEEK), and its blends with poly(aryl-ether-imide) (PEI), has been determined as a function of temperature by means of small-angle (SAXS) and wide-angle (WAXS) X-ray scattering studies, using synchrotr…
We have measured the dielectric relaxation of the glass-forming liquid N-methyl-$\ensuremath{\varepsilon}$-caprolactam (as a representative of nonassociating liquids of low molecular weight) confined to the mesopores of a controlled porous glass with 102 \AA{} pore diameter. Three distinct relaxation peaks within ${\e…
A $^{13}\mathrm{C}$ NMR study on $\ensuremath{\kappa}={(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}X$ ($X=\mathrm{Cu}{(\mathrm{NCS})}_{2}, \mathrm{Cu}[\mathrm{N}{(\mathrm{CN})}_{2}]\mathrm{Br}, \mathrm{and} \mathrm{Cu}[\mathrm{N}{(\mathrm{CN})}_{2}]\mathrm{Cl}$) is report…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCeria-Based Anodes for the Direct Oxidation of Methane in Solid Oxide Fuel CellsE. S. Putna, J. Stubenrauch, J. M. Vohs, and R. J. GorteCite this: Langmuir 1995, 11, 12, 4832–4837Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published…
First-order Raman spectra of hydrogenated nanocrystalline silicon (nc:Si:H) films show unexpected features in their optical vibrational modes for crystallites with sizes ranging from 2 to 6 nm. Two size-dependent spectral regions, one with the stronger intensity peaking at 505–509 cm−1 and another a shoulder-like band…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR Spectroscopy and Photophysics of the Lowest Photoactivated Triplet State of a Series of Highly Conjugated (Porphinato)Zn ArraysP. J. Angiolillo, Victor S.-Y. Lin, J. M. Vanderkooi, and Michael J. TherienCite this: J. Am. Chem. Soc. 1995, 117, 50, 12514–12527Publication D…
The effects of nitrogen alloying on the corrosion properties of stainless steels (SS) is a matter of debate. A number of apparently contradictory results have been presented by various researchers. The actual mechanism by which nitrogen alloying influences the corrosion properties of SS has been the topic of even more…
Summary Adsorption of Cu(II), Zn(II), Co(II) and Cd(II) on kaolinite has been investigated at 25°C as a function of pH, concentration of the substrate, and the nature and concentration of the supporting electrolyte. The adsorption edges for three metals (Zn(II), Co(II) and Cd(II)) showed clear evidence of two distinct…
A method is presented in which both optical constants and growth rates may be simultaneously extracted from the in situ normal incidence reflectance of a growing thin film. The method employs a virtual interface model, thus avoiding cumulative errors that are encountered if a standard multiple-layer model is used. No…
Abstract We describe a model for framework silicates in which the SiO 4 (and AlO 4 ) tetrahedra are treated as perfectly rigid and freely jointed. From this model we are able to identify low-energy modes of distortion of the structure, which we call Rigid unit modes. These modes can act as soft modes to allow easy dis…
Photoluminescence (PL) and Raman spectroscopy were employed to investigate the nature and sources of stress and the type and distribution of impurities and defects in thin diamond films grown on silicon substrates. The types of impurities and defects which were detected in the diamond films are the nitrogen, silicon,…
ABSTRACT Eight diatom species (Chaetoceros pseudocurvisetus Mang ., Stephanodiscus hantzschii Grun ., Skeletonema costatum ( Grev.) Cleve , Asterionella formosa Hass ., Thalassiosira nordenskioeldii Cleve , Detonula confervacea ( Cleve) Gran , Chaetoceros sp., and Nitzschia frigida Grun.) were isolated from various te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble-Layer Superlattice Structure Built Up of Cd32S14(SCH2CH(OH)CH3)36.cntdot.4H2O ClustersT. Vossmeyer, G. Reck, B. Schulz, L. Katsikas, and H. WellerCite this: J. Am. Chem. Soc. 1995, 117, 51, 12881–12882Publication Date (Print):December 1, 1995Publication History Publis…
The hydroxyl substituent makes it happen! Unlike the nonaromatic benziporphyrin 1a (X = H), the hydroxy compound 1b (X = OH) favors the fully aromatic semiquinone tautomer 2.
Monomers with reactive double bonds were mixed with liquid crystals and polymerized under UV irradiation. The polymer networks formed are anisotropic and consist of fibrils. The orientation of the polymer networks depend on the orientation of the liquid crystals during polymerization. Optical and scanning electron mic…
Onset of pitting corrosion on 304 stainless steel in was investigated at the site of approximately 200 inclusions. A photolithography technique was used to locate individual sites repeatedly in order to characterize them by a combination of scanning electron microscopy, energy dispersive x‐ray, and Auger electron spec…