Materials Literature
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Linear polysiloxanes bearing 3-chloropropyl groups pendant to the polymer chain and containing a vinyl functional group at one chain end were synthesized by anionic ring polymerizations of 2,4,6-tri(3-chloropropyl)-2,4,6-trimethylcyclotrisiloxane, 1, and 2-(3-chloropropyl)-2,4,4,6,6-pentamethylcyclotrisiloxane, 2, ini…
The possible use of an FT-IR imaging system for surface studies of atmospheric corrosion products on zinc and nickel samples has been explored. Samples have been exposed in an urban site located at Rouen in France. Corrosion products, detected by means of energy-dispersive spectrometry/X-ray diffraction (EDS/XRD) and…
We fabricated a planar-type film inductor with good high frequency characteristics using a FeTaN soft magnetic film. While FeTaN films inherently show good soft magnetic properties and high saturation magnetization, addition of Ti underlayer with a combination of magnetic field annealing leads to an increase of anisot…
Aspartate aminotransferase from an extremely thermophilic bacterium, Thermus thermophilus HB8 (ttAspAT), has been believed to be specific for an acidic substrate. However, stepwise introduction of mutations in the active-site residues finally changed its substrate specificity to that of a dual-substrate enzyme. The fi…
Transmission electron microscopy (TEM) of yttria (Y2O3)-cubic-stabilized zirconia with an yttria content between 24 and 32 mol% reveals diffuse electron scattering. Analysis of the diffuse intensity maxima in electron diffraction patterns recorded with the incident electron beam along (112)c or (110)c zone axes sugges…
By reacting manganese nitrate and sodium hydroxide at pH/spl sime/12 and heating the product at 400/spl deg/C for 3 hrs, Mn/sub 5/O/sub 8/ with crystallite size /spl sime/14 nm and the Cd/sub 2/Mn/sub 5/O/sub 8/ structure is produced, as confirmed by x-ray diffraction. Magnetic state of Mn/sub 5/O/sub 8/ is investigat…
Structural studies have confirmed that it is possible to exploit the relatively low nucleophilicity of the “external” amino substituents on the CoIII complex of 1,8-diaminosarcophagine (“sarcophagine” = sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane) in acylation and alkylation reactions leading to a variety of fu…
Structural and magnetic analyses were made for /spl alpha/'-Fe-C (0-12 at.%C) and /spl alpha/'-Fe-N(0-12 at.%N) films. The results are summarized as follows: (1) epitaxial Fe-C films consisting of an /spl alpha/'-Fe-C single phase with a C content up to 12 at.% can be synthesized on MgO single crystal substrates by sp…
In the present study, x-ray photoelectron spectroscopy (XPS) was employed to investigate the principal core levels of a Fe2O3 thin film. The sample was deposited on glass in a N2+O2 atmosphere by chemical vapor deposition (CVD), using Fe(acac)3 (Hacac = 2,4-pentanedione) as the source compound. XPS surface data for th…
Textured alumina has been fabricated previously by either hot‐deformation processing, to produce moderate texture, or templating with aligned platelets, to produce stronger texture. Fracture‐toughness measurements on ceramics fabricated by hot deformation have indicated only a modest improvement in toughness compared…
From MnZn ferrite ("6H20" of FDK production), cores having grain size of about 8/spl sim/10 /spl mu/m were produced by controlling the calcination temperature, after-calcination milling time, and sintering conditions. The ferrite powder production conditions and core microstructure were examined to determine their eff…
Abstract Previous research work in our laboratory has indicated that the efficiency of certain flame‐retardant fibres can be further enhanced if certain interactive intumescents are dispersed on their surfaces. In our previously reported work we have successfully observed interactions between certain commercially avai…
Beryllium oxide crystals are studied by time-resolved optical and luminescence vacuum-UV spectroscopy. The low-temperature luminescence spectra and the luminescence decay kinetics (2.5–10 eV, 1–500 ns) upon selective photoexcitation, and also the luminescence excitation and reflectivity spectra (8–35 eV), are analyzed…
Self-passivated copper as a gate electrode in the form of TiO/Cu/TiO/TiN/SiO2 has been obtained by annealing Cu/Ti/TiN/SiO2. The thickness of Ti in Cu/TiTiN was optimized at 150 Å by forming an 80 Å continuous TiO film on the outer surface of the Cu. The multilayer of SiO2/TiO/Cu/TiO/TiN/SiO2 showed stable electrical…
Improvements in the optical switching properties of electrochromic nickel hydroxide/nickel/glass thin film are reported. Nickel metal film was deposited on glass by e-beam evaporation prior to following electrochemical redox cycling to form nickel hydroxide for electrochromic activation. In the absence of the indium t…
The reaction of Eu(tta) 3 (tta = thenoyltrifluoroacetonato) with 4,4'-bipyridine (bipy), trans-1,2-bis(4-pyridyl)ethylene (bipyete), and 4,4'-bipyridine-N,N'- dioxide (bipyo) yielded three distinct complexes [Eu(tta) 3 (bipy)(H 2 O)] (1), [Eu(tta) 3 (bipyete)(CH 3 OH)]·CH 3 OH·bipyete (2), and [Eu(tta) 3 (bipyo)]·CH 3…
X-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), and x-ray absorption spectroscopy (XAS) techniques have been applied to characterize the surface composition and structure of a series of CuO–TiO2–CeO2 catalysts. For a small loading of cerium, ceria was mainly dispersed on the titania surface and a mino…
Abstract Blends of two or more polymers having appropriate reactive groups can be crosslinked through condensation or substitution reactions in the absence of crosslinking chemicals when molded at high temperatures for prolonged times. When at least one of the two polymers is a rubber, such blends are called “self-cro…
The temperature dependence of the coercivity of Sm-Co based magnets is investigated by magnetization measurements and model calculations. The Zr-free titanium-substituted Sm-Co material exhibits a positive temperature coefficient dH/sub c//dT of the coercivity (TCC) above room temperature, a reasonable hysteresis-loop…
The temperature dependence of coercivity in Sm(Co/sub bal/Fe/sub 0.1/Cu/sub y/Zr/sub 0.04/)/sub 7.0/ magnets with y=0 to 0.20 has been systematically studied. Two models are discussed with respect to the temperature dependence of coercivity. One model considers only domain wall (DW) pinning and explains the "abnormal"…