Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the stability of poly(ethylene oxide) and PEO-based solid electrolytes using thermogravimetry-mass spectrometryG. K. Jones, A. R. McGhie, and G. C. FarringtonCite this: Macromolecules 1991, 24, 11, 3285–3290Publication Date (Print):May 1, 1991Publication History P…
The development and the continued success of switch-mode power supplies have created an expanding commercial market. This market is continually challenging the ferrite industry to produce high-quality ferrite cores capable of operating at increasingly higher frequencies. The advantage of the switch-mode power supply i…
We report preliminary results of scanning electron microscopy (SEM) imaging with submicron resolution at atmospheric pressure using silicon nitride windows to separate the atmosphere from the electron optics. The edge response of the current system is 0.25 μm through 75 nm windows at 15 μm air path length. We discuss…
Abstract Gorring (1973) reported a phenomenon, the “window effect,” whereby the diffusivities of normal paraffins within zeolite T do not decrease monotonically with increasing carbon number N, as would be expected intuitively. Rather, following an initial decrease with N, the diffusivities exhibit a local minimum at…
Communication: Discotic mesogens with C 3 symmetry (see figure) are shown to form the basis of a chemically stable low‐temperature model for the carbonaceous mesophase, a key intermediate in the production of coke and graphite via the carbonization of organic precursors. The synthesis and properties are reported. magn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of silicate ratio on the distribution of silicate and aluminosilicate anions in TPA aluminosilicate solutionsR. F. Mortlock, A. T. Bell, A. K. Chakraborty, and C. J. RadkeCite this: J. Phys. Chem. 1991, 95, 11, 4501–4506Publication Date (Print):May 1, 1991Publication…
Recent genetic mapping of the aspartokinase II (lysC) operon of Bacillus subtilis [M. Petricek. L. Rutberg & L. Hederstedt (1989) FEMS Microbiology Letters 61, 85-88; N.Y. Chen. J. J. Zhang & H. Paulus (1989) Journal of General Microbiology 135, 2931-2940] has shown its chromosomal location to be close to the aecA loc…
Magnetron sputtering was used to deposit a thin film of lanthanum hexaboride for cathode structures. The chemistry of the coatings was studied with x-ray diffraction, Auger electron spectroscopy, and x-ray photoelectron spectroscopy. The work function and electron emission characteristics of the coating have been stud…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition-metal borides with the tantalum boride (Ta3B4) crystal structure: their electronic and bonding propertiesR. M. Minyaev and Roald HoffmannCite this: Chem. Mater. 1991, 3, 3, 547–557Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Pu…
Abstract Oxygen plasma treatments of transparent polymers such as polystyrene (PS) and polycarbonate (PC) were performed. Then the hydrophobic recovery of treated surfaces and its effect on their misting behavior was studied. Surface investigations, such as XPS and water contact angle measurements, were combined with…
Sediments between 10 and 15 km thick have prograded approximately 400 km into the small oceanic basin which formed along the southern margin of North America subsequent to early Mesozoic rifting. Redistribution of mass during burial diagenesis, and the chemistry of present‐day formation waters in Jurassic through Plei…
The changes in composition of the grain boundary regions in Nimonic PE16, which occur during heat treatment and on neutron irradiation, are described. The results show that the composition of these regions is sensitive to heat treatment variables, bulk composition, and irradiation. In particular, molybdenum has a stro…
This article Introduces a technology for the simultaneous control of the emissions of PCDD/ PCDF, hydrochloric acid (HCI) and nitrogen oxides (NOx) from municipal solid waste (MSW) Incinerators. The technology uses ammonia as the control medium for all three pollutants. In this paper, the theoretical basis of the tech…
Abstract The strength distribution of reaction-bonded silicon carbide tubes that failed by internal pressurization was predicted from strength distributions obtained from simple laboratory test specimens at room temperature. The strength distributions of flexure bars, C-rings tested in tension, C-rings tested in compr…
Abstract Graft copolymerization was carried out onto a poly(methyl methacrylate) (PMMA) plate for surface modification. The following treatments were conducted to introduce peroxides into the PMMA surface prior to graft copolymerization: UV irradation, corona discharge, glow discharge, and ozone exposure. The static c…
In order to study the structure of defects in nematic liquid crystals, we have constructed a numerical procedure that minimizes the Landau-de Gennes free energy model. Using a new representation, a finite-element discretization, and a direct minimization scheme based on Newton's method and successive overrelaxation, t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of large but defective deltahedra in the structural chemistry of very complex solid borides and gallidesJeremy K. Burdett and Enric CanadellCite this: Inorg. Chem. 1991, 30, 9, 1991–1998Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Pu…
Reversible phase transformations with volume contractions were found at 18 GPa and 22 GPa when graphite was compressed at room temperature. Volume contraction was detected in a diamond anvil cell by observing a plateau in the curve of generated pressure versus the cell load. The phase realized at 18 GPa is thought to…
Reactive sputter deposition was used to grow a phase-separated 0.40 Au/0.56 Au2O3/0.04 Au-hydroxide cermet film and x-ray photoelectron spectroscopy was used to examine the Au 4f and O 1s core electron binding energy of each phase. The valence band structure of Au2O3 is reported here for the first time, and consists o…
Abstract 2‐Ethyl‐2‐hydroxymethyltrimethylene carbonate (5‐ethyl‐5‐hydroxymethyl‐1,3‐dioxan‐2‐one) ( 1 ) was treated with trimethylsilyl chloride, benzyl chloroformate and phenyl isocyanate to give the corresponding 5,5‐disubstituted 1,3‐dioxan‐2‐ones 2 , 3 and 4 . These monomers were subjected to anionic ring‐opening…