Materials Literature
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Stresses in oxide scale–metal systems can lead to decohesion of the scales when critical values are exceeded, which manifests itself in stable growth of interfacial cracks and separation along the scale/metal interface or in sudden spalling of the scale or of parts of it as a result of unstable cracking processes. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic and structural studies on the novel nitrogen ligand 2,5,8,10,13,16-hexaazapentacyclo[8.6.1.12,5.09,18.013,17]octadecane and its reaction products with methanolic cadmium halogenide solutions: Ci-C12H22N6, [CdX2(C2-C12H22N6)] (X = Cl, Br, I), and [CdI2(C12H23N6OCH3)…
Abstract— In connection with the use of red light‐photosensitizers for photodynamic therapy, the redox reactivity of excited metallophthalocyanines (M = Al, Ga) was investigated by flash photolysis in order to establish whether photooxidations proceed by Foote's mechanisms I or II. Aminoacids (tryptophan, tyrosine) we…
The temporal evolution of the velocity field of an unsteady fluid flow can be tracked by combining particle image velocimetry and high speed photography. We used this technique to investigate the flow around cavitation bubbles during their collapse near a solid boundary. The light source was an argon laser with an ext…
Abstract Studies of a wide variety of modern and fossil skeletal carbonates indicate they all contain water in amounts ranging from a few tenths of one percent to as much as three percent by weight. The word water is used as a general term to include all inorganic liquid and bound H 2 O and OH (super -) . Reflectance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence enhancement from Langmuir-Blodgett monolayers on silver island filmsR. Aroca, Gregory J. Kovacs, C. A. Jennings, R. O. Loutfy, and P. S. VincettCite this: Langmuir 1988, 4, 3, 518–521Publication Date (Print):May 1, 1988Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRearrangement through Berry pseudorotation and olefin insertion of d8 five-coordinate Rh(H)(C2H4)(CO)2(PH3). An ab initio MO studyNobuaki. Koga, Su Qian. Jin, and Keiji. MorokumaCite this: J. Am. Chem. Soc. 1988, 110, 11, 3417–3425Publication Date (Print):May 1, 1988Publicat…
Abstract Palladium oxide was detected by XPS and IR (Attenuated Total Reflection) analysis of the surface of a Pd electrode which was polarized in the medium 1 M KOH. This oxide set a peak of Pd 3d 5/2 shifted 3.5 eV with respect to the metal which is a much higher value than those reported and obtained for PdO and Pd…
Densified glass specimens of 90 B2O3⋅10 Na2O⋅1 Eu2O3 were obtained by applying hydrostatic pressure up to 6 GPa at various temperatures from 250 to 900 °C, and their densities and inhomogeneous bandwidths of Eu3+ fluorescence spectra were determined in order to follow a structural change taking place during densificat…
Abstract A dilute polyamic acid solution was spin‐deposited onto gold substrates and XPS analyses were performed after deposition. Evidence of the presence of organic films on the top surface of the substrates was found. A chemical characterization allowed us to identify these organic films as being polyamic acid afte…
Abstract not Available.
An overview is given of partial discharge patterns, their evaluation, and determination of their origin. Some brief comparisons of test equipment considered to be of general interest are made. The intent is to assist practitioners in the interpretation of results as well as in the accurate discrimination between true…
A compilation is presented of the temperature factors of 22 cubic elements. This represents the first stage of a Temperature Factor project initiated by the Neutron Diffraction Commission of the International Union of Crystallography [Acta Cryst. (1985), B41, 374].
Abstract The effect of stereoregularity on gas permeation properties of poly(methyl methacrylate) (PMMA) was investigated. The gas permeability coefficients for He, H 2 , O 2 , N 2 , Ar, CH 4 , and CO 2 at 35°C near atmospheric pressure have been measured for three different PMMAs. Apparent diffusion and solubility co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel chemical pathways and charge-transport dynamics of electrodes modified with electropolymerized layers of [Co(v-terpy)2]2+A. R. Guadalupe, D. A. Usifer, K. T. Potts, H. C. Hurrell, A. E. Mogstad, and H. D. AbrunaCite this: J. Am. Chem. Soc. 1988, 110, 11, 3462–3466Publi…
Monte Carlo simulations were performed for hard disks on the surface of an ordinary sphere and hard spheres on the surface of a four-dimensional hypersphere. Starting from the low density fluid the density was increased to obtain metastable amorphous states at densities higher than previously achieved. Above the freez…
The complex admittance was measured for CsH2PO4 in the frequency range from 30 Hz to 60 MHz and in the temperature range 90-550 K. The domain wall relaxation time was found to decrease anomalously when approaching to Tc. From the investigations of the conductivity of CDP the structural phase transition at Tsi.=503K wa…
Abstract In the present paper, progress has been made in developing a model for nonisothermal vulcanization of rubber compounds. The model is presently based on differential scanning calorimetry (DSC) measurements of heat evolved during vulcanization. The model parameters are determined from several isothermal DSC sca…
We present a simple way to compensate for hysteresis and creep in piezoelectric actuators. By inserting a capacitor in series with the piezoelectric actuator, we find a reduction in the size of the hysteresis loop. For a suitable small capacity in series, creep is eliminated.
Electrochemical impedance (AC impedance) measurements are practical for predicting corrosion behavior. Combining this technique with small amplitude DC polarization offers a rapid method of estimating corrosion rates. Optimization of the potentiostat gain allows for the rapid estimation of very low corrosion rates. Fu…