Materials Literature
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Abstract The epoxidation of cyclohexene, 1-decene, and styrene by molecular oxygen in the presence of aldehydes such as isobutyraldehyde and pivalaldehyde was efficiently catalyzed at 303 K by mono-cobalt-substituted Keggin-type heteropolytungstate.
Abstract We detail the melting behavior of poly(ether ether ketone) (PEEK) and investigate its melting behavior in miscible blends with poly(ether imide) (PEI). The determination of the equilibrium melting point ( T m 0 ) of PEEK is discussed by considering its inhomogeneous morphology. T m 0 is obtained by a long ext…
peer reviewed
Measurements of dynamic hysteresis loops on Fe/sub 78/B/sub 13/Si/sub 9/ amorphous ribbons, in the range 0.5 Hz>
Structural changes in sol–gel‐derived TiO 2 –SiO 2 coatings were found to proceed in an environment of high temperature and high humidity as follows: (1) dissociation of Si–O–Ti bonds in the coating by the attack of water vapor, (2) formation of Ti–O–Ti bonds, and (3) nucleation and growth of anatase TiO 2 . The coati…
The crystallographic structures of carbide and nitride formed in TiAl containing carbon and nitrogen have been investigated using transmission electron microscopy. The needle-shaped carbide and nitride are formed parallel to only the [001] direction of the L10-ordered TiAl matrix. Detailed analyses in terms of selecte…
Abstract The temperature dependence of the nucleation effect of three sorbitol derivatives on the crystallization of isotactic polypropylene (iPP) was studied by means of isothermal crystallization kinetic analysis. Isothermal crystallization thermograms obtained by differential scanning calorimetry (DSC) were analyze…
Amorphous Tb-Fe thin films prepared by the sputtering method in the compositional range Tb/sub x/Fe/sub 1-x/ (x=0-0.5) are investigated in view of their potential for use in electromagnetic thin film actuators. The magnetostriction and the coercive force for the Tb-Fe films are examined for different sputtering condit…
Two- and three-dimensional patterns and structures can be grown by electron-beam induced deposition from organic and metalorganic precursors. Using a very fine electron beam in a dedicated field emission scanning electron microscope produces nanometer size deposits which extend from surfaces to heights in the micromet…
X-ray-absorption fine-structure (XAFS) data of RbBr, RbCl, and KBr at 30 K and 125 K were measured and analyzed. An ionized-atom multiple-scattering calculation and a correlated Debye model were used for fitting the theory used in the computer code feff5 to data. The modifications of feff5 necessary to obtain good fit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiomimetic modeling of photosynthetic reaction center function: long-lived, spin-polarized radical ion pair formation in chlorophyll-porphyrin-quinone triadsMichael R. Wasielewski, George L. Gaines III, Gary P. Wiederrecht, Walter A. Svec, and Mark P. NiemczykCite this: J. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward organic synthesis of a magnetic particle: dendritic polyradicals with 15 and 31 centers for unpaired electronsAndrzej Rajca and Suchada UtamapanyaCite this: J. Am. Chem. Soc. 1993, 115, 23, 10688–10694Publication Date (Print):November 1, 1993Publication History Publis…
We have proposed a high-track-density optical recording method, which records signals on both the land area and groove area. From a computer simulation based on the scalar diffraction theory, we found that crosstalk between recording tracks depends on the groove depth, and is most reduced at the groove depth of 80 nm∼…
Despite their homologous structure, c-type lysozymes and alpha-lactalbumins have been found to differ profoundly in their unfolding behavior, in that the alpha-lactalbumins readily enter a partially unfolded collapsed state (the "molten globule"), whereas lysozymes unfold cooperatively to a highly unfolded state. The…
An electron cyclotron resonance plasma reactor has been built in order to study the filling of high aspect-ratio features on semiconductor devices with metal. The reactor produces a plasma of copper which is nearly 100% ionized at the substrate, without the use of any buffer or carrier gas. The ion flux is dependent o…
The potential energy of interaction between two deformed particles, having the shape of spherical segments and separated by a planar film, is considered. An exact explicit expression for the van der Waals interaction energy between such deformed particles of arbitrary size and deformation is derived by using the micro…
The genes for the acetate-activating enzymes, acetate kinase and phosphotransacetylase (ack and pta), from Methanosarcina thermophila TM-1 were cloned and sequenced. Both genes are present in only one copy per genome, with the pta gene adjacent to and upstream of the ack gene. Consensus archaeal promoter sequences are…
We describe the effect of shear on the solid-liquid phase boundary of particles that interact via a screened Coulomb potential. Both fcc and bcc phases shear through layer-over-layer sliding. As the shear rate \ensuremath{\gamma}\ifmmode \dot{}\else \.{}\fi{} increases from zero, the degree of disorder in the layers i…
High-remanence, isotropic magnetic powder of a low rare earth content is developed for resin-bonded magnet applications. The materials are based on a metastable Fe(Fe, Co)/sub 3/B-Nd/sub 2/Fe/sub 14/B nanocrystalline mixture with the addition of a small amount of one of Al, Si, Cu, Ga, Ag, and Au. The effects of the a…
We wish to address the criticisms of Tanner and Rudowicz regarding the feasibility of using lanthanide luminescence spectroscopy as a monitor of crystal structure, as was suggested in the recent paper by Chen et al. Such optical methods (including absorption and phonon Raman spectroscopy) have been and continue to be…