Materials Literature
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Abstract Supersaturated conditions in oceanic and other sedimentary environments, and the crystal morphologies of sedimentary minerals support the occurrence in nature of widespread and powerful crystallization inhibition by extremely small, substoichiometric concentrations (< 1 mg/l) of soluble organic substan…
Results from integral-effects core melt progression experiments and from the examination of the damaged core of the Three Mile Island Unit 2 (TMI-2) reactor are reviewed to gain insight on key severe accident phenomena. The experiments and the TMI-2 accident represent a wide variety of conditions and physical scales,…
The phase relations for the system y 2 o 3 –Ta 2 o 5 in the composition range 50 to 100 mol% Y 2 O 3 have been studied by solid‐state reactions at 1350°, 1500°, or 17000C and by thermal analyses up to the melting temperatures. Weberite‐type orthorhombic phases (W2 phase, space group C222 1 ), fluorite‐type cubic phase…
In order to evaluate the most suitable method of analysis (A- phi or T- Omega method) and finite element (nodal or edge element) for a given problem, the features of each method and element have been investigated. The accuracy, computer storage, and CPU time of each method and element are compared for a 3-D nonlinear…
The fracture toughness of whisker‐reinforced, noncubic ceramic matrices increases with increases in matrix grain size, d, as well as with increases in whisker content. An analytical description for the grain‐bridging toughening contribution is combined with the whisker‐bridging contribution to describe the toughness o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis(4-imidazoleacetato)iron.bis(methanol): a 2D antiferromagnetic iron(II) system exhibiting 3D long-range ordering with a net magnetic moment at 15 KMaria Angeles Martinez-Lorente, Vasili Petrouleas, Jean Michel Savariault, Richard Poinsot, Marc Drillon, and Jean Pierre Tuc…
Very low tolerable partial pressures of H2S (pH2S ) have been reported for duplex stainless steels in sour environments. However, such steels resist stress corrosion cracking (SCC) in sour environments even at substantial pH2S values. To assess the limits of applicability, SCC tests should include an environment of re…
The conformational stabilities of native pig citrate synthase (PCS), a recombinant wild-type PCS, and six active-site mutant pig citrate synthases were studied in thermal denaturation experiments by circular dichroism and in urea denaturation experiments by using DTNB to measure the appearance of latent SH groups. His…
Submerged arc welds of a 22Cr–3Mo–8Ni (wt-%) duplex stainless steel were aged in the temperature range 400–600°C to simulate stress relieving conditions of mild steel. Particular attention was paid to the relationship between toughness and microstructure. It was concluded that sufficient toughness could be obtained on…
Abstract For corrigendum see DOI: 10.1002/anie.199113862
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of hydrogen bonding on the melting point depression in polymer blends where one component crystallizesPaul C. Painter, Suresh L. Shenoy, Dorab E. Bhagwagar, Jim Fishburn, and Michael M. ColemanCite this: Macromolecules 1991, 24, 20, 5623–5629Publication Date (Print):S…
BaTiO 3 thin films were prepared on MgO(100) substrates by chemical vapor deposition using barium β-diketonate {Ba(C 11 H 19 O 2 ) 2 } and titanium tetraisopropoxide {Ti[OCH(CH 3 ) 2 ] 4 } as metalorganic precursors. BaTiO 3 films deposited at 800-1000°C showed prominent a -axis orientation perpendicular to the substr…
The tin and zinc effect on the aluminum activation process produced in the Al-5%Zn-0.1 %Sn alloy in aggressive media was analyzed. Potentiostatic, galvanostatic, and potentiodynamic polarizations, electron microscopic observations, and energy-dispersive x-ray (EDX) analysis were used to analyze the generated attack. T…
Abstract Smectites in the montmorillonite-beidellite pseudo-binary system were synthesized from glass at the hydrothermal conditions 100 MPa and 250–500°C. Products were analysed by X-ray powder diffraction for randomly oriented and glycolated samples, and also according to the Greene-Kelly test. A new mixed-layer min…
SUMMARY Neither the specific surface area values (from N 2 sorption) nor the ethylene glycol monoethyl ether (EGME) retention values of 21 soil samples from New Zealand and Fiji could all be accounted for by the sum of the contributions from their component minerals. Much EGME is probably retained by internal surfaces…
Abstract Structural features of very highly disordered 2:1 trioctahedral phyllosilicates from the Madrid Basin have been studied. Application of Fourier methods to XRD patterns shows that these materials consist of random kerolite-stevensite mixed-layered phases (R = 0) with 50–80% kerolite layers, and have a very sma…
Transparent and optical-grade TiO(2) coatings were prepared by sol-gel spinning and ion-beam sputtering techniques. We investigate process parameters for the fabrication of sol-gel spin-coated TiO(2) films exhibiting high optical quality comparable with that of ion-beam-sputtered TiO( 2) films. X-ray diffraction studi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterojunctions formed from phthalocyanine and perylene thin films: photoelectrochemical characterizationJ. Danziger, J. P. Dodelet, P. Lee, K. W. Nebesny, and N. R. ArmstrongCite this: Chem. Mater. 1991, 3, 5, 821–829Publication Date (Print):September 1, 1991Publication His…
We study polymerized membranes with quenched random internal disorder, caused by impurity-induced fluctuations in the preferred metric. Although the flat phase characteristic of pure systems persists when the disorder is weak, membranes are destabilized by a disorder-induced softening of the bending rigidity at zero t…
Structural phase transitions which involve the generation of lattice strain (i.e. in ferroelastic and co-elastic crystals) are reviewed. Landau–Ginzburg theory is found to lead to an appropriate description of order parameters following the theoretical predictions over large temperature intervals. A quantum extension…