Materials Literature
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Abstract Two superduplex stainless steel hubs on a subsea manifold subject to cathodic protection failed as a result of hydrogen embrittlement stress corrosion cracking. A series of tests was performed to establish the threshold condition for cracking. The tests included: (i) constant-load smooth bend tests, (ii) cons…
Abstract In selecting materials for corrosive sour oil field environments, the materials of choice must be reliable and cost-effective. Materials have to meet criteria for corrosion resistance and mechanical properties in service environments for the required service life. Both age-hardened nickel-base alloys and cold…
Abstract Steels containing up to 5% Cr were investigated with respect to their corrosion performance in oil and gas environments. Steels containing 3%Cr or more showed improved corrosion performance over Cr free steel by a factor of two or more in a sweet corrosion environment. 5% Cr steel, however, showed deeper loca…
Abstract The mechanistic model of uniform CO2 corrosion is presented which covers: electrochemical reactions at the steel surface, diffusion of species between the metal surface and the bulk including diffusion through porous surface films, migration due to establishment of potential gradients and homogenous chemical…
Abstract Corrosion protective film is important to prevent CO2 corrosion. The formation behavior of corrosion protective film on C-Mn steel and low Cr bearing steels with martensitic microstructure was investigated in a CO2 environment at 60°C. Immersion tests were performed with test periods of 24, 48, 96 and 720 hou…
A dual catalyst bed system (Au/Fe 2 O 3 + Pt−Pd/Al 2 O 3 ) for eliminating hydrogen from the CO 2 feed gas in urea synthesis is found to be far superior to commercially available and patented catalysts in catalytic activity. At relatively low temperatures, hydrogen is eliminated and coexistent CO is also oxidized comp…
The compounds Pb(2)La(x)Bi(8-x)S(14) (I), Sr(2)La(x)Bi(8-x)S(14) (II), and Cs(2)La(x)Bi(10-x)S(16) (III) were synthesized from the corresponding elements or binary sulfides at temperatures above 850 degrees C. Compounds I and II are isostructural, forming a new structure type, while the structure of III is related to…
Numerical experiments of crystallization in a binary eutectic system were carried out to understand the origin of textural variation in igneous rocks. In this study, the number density of crystals was intensively examined as a parameter of texture. The constant cooling rate experiment (no latent heat release) yields a…
More than 50 [Nb x C y ] + clusters have been observed in the gas phase. We report a density functional investigation of 100 isomers of 28 of the most prominent of these clusters, ranging in size from [Nb 2 C 2 ] to [Nb 12 C 20 ] and [Nb 14 C 16 ], calculated as both neutral and monocation species. Vertical ionization…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTWeak versus Strong: A Weak Polyacid Embedded within a Multilayer of Strong PolyelectrolytesAnne F. Xie and Steve GranickView Author Information Department of Materials Science and Engineering University of Illinois at Urbana-Champaign 1304 West Green Street, Urbana, Il…
The adsorption and photochemistry of N 2 O chemisorbed on TiO 2 powder has been investigated. At 157 K, nitrous oxide is molecularly adsorbed on the reduced titanium dioxide. Adsorption on the TiO 2 surface takes place through both the N and O ends of the nitrous oxide molecule. The photochemistry of the adsorbed N 2…
The photoexcitation, relaxation, and optical erasure regimes of spiropyran- (SP-) doped polymer films were studied. Cellulose acetate, poly(vinyl acetate), and poly(methyl methacrylate) (PMMA) were used as host polymer matrices. We studied the character of the photoreaction for both coloring and bleaching processes. R…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDifferential Plasmon Spectroscopy as a Tool for Monitoring Molecular Binding to Ultrathin Gold FilmsGregory Kalyuzhny, Marie Anne Schneeweiss, Abraham Shanzer, Alexander Vaskevich, and Israel RubinsteinView Author Information Departments of Materials & Interfaces and O…
Many salicylideneanilines have been known to exhibit thermochromism in the solid state. In contrast, in the solution, the thermochromism has rarely been observed. This paper reveals that salicylideneanilines are generally thermochromic in the solution of hydrocarbon solvents and that the proton tautomerization, which…
The crystallization behavior of poly(1-butene) (P1b) was investigated by polarized light microscopy (PLM), atomic force microscopy (AFM), wide-angle X-ray scattering (WAXS), dilatometry, and also by time- and temperature-resolved small-angle X-ray scattering experiments (SAXS). Observations in the PLM indicate a tempe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFabrication of Oriented Nanoscopic Ceramic Lines from Cylindrical Micelles of an Organometallic Polyferrocene Block CopolymerJason A. Massey, Mitchell A. Winnik, Ian Manners, Vanessa Z-H. Chan, Johannes M. Ostermann, Rainer Enchelmaier, Joachim P. Spatz, and Martin Möl…
Femtosecond pump-probe measurements find pronounced dimensionality dependence of the optical nonlinearity in cuprates. Although the coherent two-photon absorption (TPA) and linear absorption bands nearly overlap in both quasi-one and two-dimensional (1D and 2D) cuprates, the TPA coefficient is one order of magnitude s…
On-line studies of structural and morphological changes during the heating and drawing process of isotactic polypropylene (iPP) fiber were carried out using synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. A unique image analysis method was used to deconvolute the two…
Full-length single-walled carbon nanotubes (SWNTs) were rendered soluble in common organic solvents by noncovalent (ionic) functionalization of the carboxylic acid groups present in the purified SWNTs. Atomic force microscopy (AFM) showed that the majority of the SWNTs ropes were exfoliated into small ropes (2−5 nm in…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTNondestructive Measurement of a Glass Transition Temperature at Spin-Cast Semicrystalline Polymer SurfacesJ. Hyun, D. E. Aspnes, and J. J. CuomoView Author Information Department of Materials Science and Engineering, North Carolina Stat…