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It is important to systematically assess the severity of a sour environment for susceptibility to sulfide stress cracking (SSC). A prediction system was established based upon SSC as a phenomenon of hydrogen embrittlement (HE). The content of H entering into steel (HFe) could be predicted from the hydrogen sulfide (H2…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen Binding in Iron and Cobalt Picnic Basket PorphyrinsJames P. Collman, Xumu Zhang, Kelvin Wong, and John I. BraumanCite this: J. Am. Chem. Soc. 1994, 116, 14, 6245–6251Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue…
Highly uniform, smooth nanocrystalline diamond films have been fabricated with a magnetoactive microwave chemical vapor deposition system. The top and bottom magnet currents were 145 and 60 A, respectively, while the microwave power and substrate temperature were controlled at 1500 W and 850 °C, respectively during de…
Evolution of viscoelasticity in an end-linking gel system has been investigated. Storage and loss dynamic shear moduli, G′(ω) and G″(ω), are determined for angular frequencies ω over more than 2.5 decades near the sol-gel transition. Gelation conditions are varied widely to obtain critical exponents which are independ…
The complex dielectric response of strontium barium niobate relaxor ferroelectrics has been studied as a function of orientation and composition. The dielectric response was found to be strongly dependent on orientation, in distinct comparison to the nearly orientation-independent response found for Pb-based perovskit…
We report x-ray photoemission spectra (XPS) of hydrated nickel hydroxide, α-Ni(OH)2, with composition 3Ni(OH)2 2H2O as determined by thermogravimetry. XPS spectra were measured with the Physical Electronics Model 5400 x-ray photoelectron spectrometer using unmonochromatized Mg Kα x rays at two pass energy settings cor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen Bonding in Micelle FormationPushpa Venkatesan, Yuan Cheng, and Daniel KahneCite this: J. Am. Chem. Soc. 1994, 116, 15, 6955–6956Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Degradation of Bacterial Poly(hydroxybutyric acid): Mechanisms from the Dependence of Pyrolysis Yields on Sample ThicknessRoy S. Lehrle and Robert J. WilliamsCite this: Macromolecules 1994, 27, 14, 3782–3789Publication Date (Print):July 1, 1994Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen tunneling in the activation of dioxygen by a tris(pyrazolyl)borate cobalt complexOlivia M. Reinaud and Klaus H. TheopoldCite this: J. Am. Chem. Soc. 1994, 116, 15, 6979–6980Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published…
Abstract During high temperature (150-300 degrees C) dolomitization experiments the rate of dolomitization increases with temperature, reactant surface area, reactant solubility, ionic strength and Mg (super 2+) /Ca (super 2+) of the solution. One would predict these results from simple kinetic theory. The discoveries…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical Transformations and Facile Disproportionation of Sulfur Dioxide on Transition Metal ComplexesGregory J. KubasCite this: Acc. Chem. Res. 1994, 27, 7, 183–190Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 19…
This paper focuses on the preparation and characterization of pure TiO 2 and ZrO 2 xerogels. The preparation method is based on a sol–gel technique using metal tert ‐amyloxides as precursors to produce nano‐sized metal oxide particles which are subsequently packed in a gelation process, eventually resulting in micropo…
ABSTRACT Fundamental theory of surface chemistry was utilized to develop an equation for calculating initial interfacial tension between a product and liquid. The relationship provides a practical approach to overcome the complexity of quantitatively determining interfacial tension of foods. The range of interfacial t…
In this work we explore the possibilities of the gel-acupuncture technique, proposed previously for the growth of protein single crystals [García-Ruiz, Moreno, Viedma & Coll (1993). Mater. Res. Bull. 28, 541-546]. The main advantage of the technique is that the crystals are obtained inside an X-ray capillary and, unli…
Pressure-induced structural transformation and the concomitant loss of intermediate-range order (IRO) in high-density ${\mathrm{SiO}}_{2}$ glass are investigated with the molecular-dynamics (MD) approach. The MD simulations cover a wide range of mass densities---from normal density (2.20 g/${\mathrm{cm}}^{3}$) to the…
Dual-mode microwave/radio frequency plasma-enhanced chemical-vapor deposition allows one to decouple ion bombardment effects from processes in the discharge volume. This approach has been used to deposit three types of hydrogenated amorphous films at low substrate temperature and high deposition rate (∼10–20 Å/s): SiN…
A novel route to organic ferromagnetic materials is proposed that is based on the stability of spin‐containing organometallic moieties such as ferricenium and the electronic or topological interactions contributed by a polymer. The magnetic properties of the new high‐spin polymers (see Figure) are shown to be sensitiv…
A polydisperse suspension with a particle size distribution from submicrometer to hundreds of micrometers is treated as bimodal, wherein it is made up of a colloidal fine fraction and a noncolloidal coarse fraction. According to the bimodal model, the fine fraction imparts to the suspension its non-Newtonian character…
Nanoparticles of ZrO 2 with diameters ranging from 4 to 8 nm were synthesized by gas condensation. As‐prepared n ‐ZrO 2 particles have a monoclinic and a high‐pressure tetragonal structure depending on size. Pure ZrO 2 was sintered to full density under vacuum at 04 T m within the monoclinic phase field. Final grain s…