Shock compressibility of condensed materials in strong shock waves generated by underground nuclear explosions
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An acoustic diagnostic technique for use with electric machine insulation
Many of the electrical failures of large electric machines have mechanical precursors. This premise has led to the attempts described here to detect mechanical changes, such as groundwall delamination, by acoustic methods as a means of early detection of incipient failure. By optimally launching an ultrasonic wave int…
Catalytic oxidation of cyclohexane into cyclohexanol and cyclohexanone over a TiO2/TS-1 system by dioxygen under UV irradiation
Cyclohexanol and cyclohexanone are obtained with high selectivity by direct oxidation with molecular oxygen catalysed by a TiO2/TS-1 system under UV irradiation and mild conditions.
A Study of the Growth of α-Al2O3 Scales Using High-Resolution Imaging Secondary Ion Mass Spectrometry
The oxide morphology and transport processes occurring during the growth of α-aluminum oxide (α-Al2O3) at 1,200°C on an iron-aluminum (Fe-25 wt% Al) alloy and a nickel-aluminum (Ni-32 wt% Al) alloy (ß-NiAl) were investigated. Imaging secondary ion mass spectrometry (SIMS) was used to locate the different isotopic spec…
Rationalization and prediction of rare earth selenide superstructures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRationalization and prediction of rare earth selenide superstructuresStephen Lee and Brendan ForanCite this: J. Am. Chem. Soc. 1994, 116, 1, 154–161Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://p…
Synthesis, electrochemical and magnetic properties of a series of new unsymmetrical macrocyclic binuclear copper(II) complexes
A series of binuclear macrocyclic copper(II) complexes [Cu2L][ClO4]2 have been prepared in which the two copper(II) ions are placed in two geometrically distinct co-ordination environments, comprising saturated and unsaturated nitrogen-donor sets. Cyclic voltammetry has revealed two reduction couples, CuIICuII→ CuIICu…
Neutron diffraction study of calcium vermiculite: hydration of calcium ions in a confined environment
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron diffraction study of calcium vermiculite: hydration of calcium ions in a confined environmentN. T. Skipper, A. K. Soper, and M. V. SmalleyCite this: J. Phys. Chem. 1994, 98, 3, 942–945Publication Date (Print):January 1, 1994Publication History Published online1 May 2…
Electrocatalytic Activity of Nafion‐Impregnated Pyrolyzed Cobalt Phthalocyanine: A Correlative Study Between Rotating Disk and Solid Polymer Electrolyte Fuel‐Cell Electrodes
Carbon supported electrocatalysts for the reduction of oxygen can be screened quickly by using a rotating disk electrode (RDE) when an appropriate material is used as a binder to hold the catalyst on the disk electrode. The results obtained with the RDE in an oxygen‐saturated solution mimic those measured for a full‐c…
Chameleonic Effect of Sulfanilamide and Sulfamethazine in Solvent Mixtures. Solubility Curves with Two Maxima.
A quantitative approach is used in this work to reproduce the solubility profile of drugs in solvent mixtures showing two solubility maxima. The solubilities of sulfanilamide and sulfamethazine were determined at 25°C in two mixtures of varying polarity (ethyl acetate-ethanol and ethanol-water). A plot of the mole fra…
Crystallinity and dielectric properties of PEEK, poly(ether ether ketone)
The dependence of specific dielectric properties of polymers on their fundamental molecular parameters was investigated as part of a study involving HV insulation in spacecraft systems. As part of an effort to understand the causes of dielectric breakdown, this investigation focused on the effect of polymer morphology…
Oriented microporous film of tetramethylammonium pillared saponite
Tetramethylammonium saponite film has been prepared and its structure has been characterized. By casting the aqueous suspension of the tetramethylammonium–saponite, a transparent film was obtained. The film is composed of oriented silicate particles with ab planes parallel to the substrate. The interlayer tetramethyla…
Plasma-enhanced chemical vapor deposition of a-SiC:H films from organosilicon precursors
A study of the growth of a-SiC:H films by plasma-enhanced chemical vapor deposition (PECVD) from two organosilicon precursors, silacyclobutane (H2CH2SiCH2CH2 or SCB) and methylsilane (CH3SiH3), is described. A capacitively coupled, parallel plate PECVD system was used to grow films at 250 °C and deposition pressure of…
Porous solids and their characterization methods of investigation and application
Abstract Porous and finely divided solids are distinguished by a large surface to volume ratio. As a result, they have specific properties, such as enhanced reactivity, a high adsorption capacity, and a lowered sinter temperature. This contribution gives a survey over selected aspects of porous solids, with the main e…
Biosynthesis of methyl-branched poly(.beta.-hydroxyalkanoate)s by Pseudomonas oleovorans
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of methyl-branched poly(.beta.-hydroxyalkanoate)s by Pseudomonas oleovoransBaki Hazer, Robert W. Lenz, and R. Clinton FullerCite this: Macromolecules 1994, 27, 1, 45–49Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Publishe…
DNA–porphyrin interactions probed by induced CD spectroscopy
Detailed analysis by induced CD spectroscopy has revealed that the manganese porphyrin, Mn(tmpyp), binds the major groove of AT or GC sequences in DNA, as well as the reported minor groove of AT sequences, with a preference that depends on the porphyrin to DNA base-pair molar ratio.
The structure of poly(m-phenylene): a prediction from single-crystal X-ray studies of m-deciphenyl and m-undeciphenyl
Single-crystal X-ray diffraction studies of the oligomers m-deciphenyl and m-undeciphenyl, isolated chromatographically from low molecular mass poly(m-phenylene), reveal disordered but unequivocally helical chain-structures, from which the crystal and molecular structure of poly(m-phenylene) can be directly inferred.
Oriented barium hexaferrite thick films grown on c-plane and m-plane sapphire substrates
The magnetic and structural properties of thick pulsed laser deposited (PLD) barium hexaferrite (BaM) films grown on c-plane and m-plane sapphire substrates were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), Rutherford backscattering spectroscopy (RBS), vibrating sample magnetometry (…
Corrosion of α‐Al Bronze in Saline Water
The corrosion behavior of α‐Al‐bronze (Cu‐7%Al) was studied in 3.4% solution for extended periods of time using x‐ray diffraction, x‐ray photoelectron spectroscopy, optical and scanning electron microscopy, and electrochemical polarization measurements. Corrosive attack occurs very early leading to general corrosion a…
Influence of preparation methods on the texture and structure of titania supported on silica
Deposition of titanium over a silica support was performed by three methods: precipitation with TiCl4 and ammonium hydroxide in aqueous solution; impregnation with titanium(IV) isopropoxide in isopropyl alcohol; grafting with a solution of TiCl4 in hexane. Samples were characterized by BET, XPS, zeta potential, DBS, X…
Effect of potassium on the surface potential of titania
The surface potential, χ, of several commercial titania powders has been measured by the vibrating condenser method in the temperature range 100–450 °C in air. The K impurity detected by XPS on some of titanias lowers the χ value of TiO2 considerably. A series of K-doped TiO2 anatase samples containing from 1.1 to 11…