Materials Literature
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The changes of enthalpy at the irreversible transformation of high-density amorphous ice to low-density amorphous ice and of low-density amorphous ice to ice Ih have been measured in a Tian–Calvet heat-flow calorimeter. The equilibrium pressures of the two transformations have been estimated from the measured enthalpy…
Abstract The effect of Fe oxidation state on the specific surface area, S m , of nontronite was studied using the <2- µ m, Na + -saturated fraction of the SWa-1 and Garfield nontronite reference clays. The reduction of structural Fe 3+ in the octahedral sheet of the nontronite decreased S m as measured by the adsor…
An increase in density is observed on melting of β-cristobalite using the constant-pressure molecular dynamics technique. The formation of vitreous silica from the melt and the structure of the glass formed are also studied.
Metal-semiconductor field-effect transistors (MESFET's) have been fabricated on a boron-doped diamond epitaxial film. This is the first report of a planar type transistor using a diamond film.
The arrays of proteins adsorbed from plasma onto a series of polystyrene copolymeric latexes were analyzed by enzyme-linked immunosorbent assay (ELISA) of washed beads and immunoblotting of proteins desorbed from the beads and separated by polyacrylamide gel electrophoresis (PAGE). Beads were prepared by continuous em…
Aromatic polyurea films with a thickness of less than 1 µm were prepared by vapor deposition polymerization using different kinds of aromatic diamine and diisocyanate monomers. After poling above the glass transition temperature, the films acquired a pyroelectric activity of (1.0–2.5)×10 -5 C/m 2 K, which is comparabl…
A dielectric relaxation peak is reported in ${\mathrm{BaTiO}}_{3}$ and in ${\mathrm{BaTi}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Fe}}_{\mathrm{x}}$${\mathrm{O}}_{3}$. It is nearly monodispersive, centered in the ${10}^{8}$-Hz range, and slowest at the transition temperature ${T}_{c}$\ensuremath{\simeq}413 K f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the "chiral wall" porphyrin: a chemically robust ligand for metal-catalyzed asymmetric epoxidationsSean O'Malley and Thomas KodadekCite this: J. Am. Chem. Soc. 1989, 111, 25, 9116–9117Publication Date (Print):December 1, 1989Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface studies of polymer blends. 2. An ESCA and IR study of poly(methyl methacrylate)/poly(vinyl chloride) homopolymer blendsJames J. Schmidt, Joseph A. Gardella Jr., and Lawrence Salvati Jr.Cite this: Macromolecules 1989, 22, 12, 4489–4495Publication Date (Print):December…
Isolated “molecular wires” are produced in the channels of zeolites by polymerizing pyrrole with embedded FeIII or CuII ions, according to spectroscopic, stoichiometric, and kinetic investigations. The doped zeolites (zeolite Y and mordenite) display no “bulk” conductivity, but they should be useful for studying the p…
Topics covered in this book include: Sintering of silicon carbide with rare earth oxide additions; Hiping of alumina; and Liquid phase sintering of tungsten.
A cDNA clone for the catalytic subunit of murine cAMP-dependent protein kinase was placed into two expression vectors, pLWS-3 and pLSW-4. For pLWS-3, the entire coding region of the catalytic subunit was inserted into the NdeI site of pT7-7 under the control of the T7 promoter. pLWS-4 contains a polycistronic transcri…
Abstract The hydrolytic stability of a new commercial polycarbonate (Calibre 300, Dow Chemical USA) was investigated and compared with that of other commercial polycarbonates. The tests were conducted between 56% and 95% relative humidity (R. H.) at 100°C. Also performed were water immersion tests at 80 and 100°C. The…
Abstract The luminescence decay times of Tl + ‐type ions in MgS, CaS, SrS, and BaS are measured as a function of temperature from 4.2 to 150 K. By applying a three‐level model, the energy difference Δ E between the lower excited states 3 T 1u ( 3 P 1 ) and 3 A 1u ( 3 P 0 ) and the transition probabilities from the two…
Abstract Polymer blends of PEEK with PES were prepared by the solution blending method. Copolymers composed of PEEK and PES components were synthesized from these oligomers. The formation conditions exerted an influence over the molecular aggregation and the crystallization behaviors of the blend films and block copol…
Three experiments were carried out using the rhizobox system to determine the distribution of heavy metals (Cu, Zn, Mn, and Fe) across the rhizosphere of barley (Hordeum vulgare L., var. Dorirumugi). The movement of 65Zn, 54Mn, and 59Fe within the rhizosphere was also investigated. The solubility of heavy metals was e…
The possible mechanisms of particle aggregation and reduction in liquid limit of the Cochin marine clay on drying are investigated. Mineralogical analysis showed the absence of halloysite in the marine specimen. Experimental results also ruled out the possibility of cementitious material being responsible for particle…
We have measured the temperature-dependent electrical conductivity of ${\mathrm{Cu}}_{2}$O at pressures up to 500 kbar and of CuO up to 700 kbar. The high-pressure phase of ${\mathrm{Cu}}_{2}$O has a resistive thermal activation energy of a few meV and localization behavior below 7 K. No phase transitions were observe…
GeAsSeTe, GeSeTeTl, and GeSeTe glass fibers with a core-cladding structure were prepared by one of two methods: crucible drawing or preform drawing. The diameter of the core was 340 microm and that of the cladding was 440 microm. The transmission loss spectra of the fibers were measured by the cut-back method. The cru…
Abstract Hornblende of the Carrol Knob mafic complex (southern Blue Ridge Mountains, North Carolina) has weathered under humid, temperate conditions. Hornblende weathering appears to have been a dissolution-reprecipitation reaction, in which hornblende dissolved stoichiometrically, and the ferruginous and aluminous we…