Materials Literature
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The crystal structure and electrophysical properties of the layered intergrowth phase Bi5PbTi3O14Cl have been studied using powder neutron diffraction, ac impedance and second harmonic generation methods. This phase adopts a structure based on a regular intergrowth of Aurivillius-like and Sillén-like blocks in the lay…
The surface of PTFE based implant material could be covalently functionalised with adhesion molecules for improved bio-adhesion by wet chemical oxidation to introduce hydroxy groups followed by cross-linking with cyanuric chloride.
Films of ferroelectric antimony sulphoiodide (SbSI) were grown on platinized silicon substrates by pulsed laser deposition (PLD). The films were grown at room temperature and later annealed at 200-250 C in air for crystallinity. The Curie temperature (T C ) of these films was 17-21 C, whereas the peak dielectric const…
The SiC/Si3N4 sintered materials were prepared by Spark Plasma Sintering at 2000°C. The crystal structure of sintered materials is cubic β-SiC type with relative density higher than 80%. All sintered materials show n-type conduction and the carrier concentration increases with increasing Si3N4 concentration. Seebeck c…
To overcome poor product yields and stability in aqueous solution, we have examined the chloroperoxidase (CPO from Caldariomyces fumago ) catalyzed oxidation of styrene in organic media using tert -butyl hydroperoxide as external oxidant. CPO's intrinsic catalytic activity in tert -butanol, as reflected in its k cat v…
The alloying effects on the stability of vanadium hydrides have been investigated systematically for binary V–M and ternary V–Ti–M alloys, where M’s are various alloying elements. The PCT curves for the β phase (V2H or VH) are measured at low hydrogen pressures using an electrochemical method. On the other hand, for t…
A modified sessile drop method was developed to obtain the precise density values for liquid nickel and nickel-chromium alloy in liquid and solid-liquid coexistence states. The density of liquid nickel decreases linearly with increasing temperature in the range from the melting point to 1923 K. The density at the melt…
The ion adsorption/desorption processes initiated by LC filling in liquid crystal (LC) cells are studied. The LC we used was 5CB and the aligning substrates were UV irradiated polyvinylcinnamate (PVCN) films providing planar alignment of LC. It is shown that intensity of adsorption/desorption processes is strongly det…
ZnS p–n homo junctions have been obtained for the first time with epitaxially grown layers having the structures of n-ZnS:In/p-ZnS:In, Ag, N/p-GaAs and p-ZnS:In, Ag, N/n-ZnS:In/n-GaAs. Both of these structures showed rectifying behavior which is expected for p–n junctions. The forward voltage of 3.7 V where current in…
A dense ceramic coating up to 130 µm thick was deposited on high silicon cast aluminum alloy by microarc discharge in silicate electrolyte. Its microstructure and composition were analyzed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and phase identification was performed by X-ray d…
Effects of crystal structure on the electrochemistry of boron-doped high temperature-high pressure (HTHP) diamond single crystals grown from a Ni-Fe-C melt are studied. On the {111}, {100}, and {311} faces, the linear and nonlinear electrochemical impedance measurements were performed and the rate of electron transfer…
Calcination of silsesquioxane mixtures of (c-C5H9)7Si7O9(OH)3, 1, (c-C5H9)7Si7O12Fe(CH3)2N(CH2)2N(CH3)2, 2, and (c-C5H9)7Si7O9(OSiMe3)O2CrO2, 3, led to microporous amorphous bimetallic Fe–Cr–Si–O materials with different Fe∶Cr ratios. A set of complementary characterisation techniques including N2 physisorption, XRD,…
Phase-field simulation of the dendrite growth of an Fe–0.15 mass%C binary alloy with fluid flow was carried out, and the mechanism of deflection of dendrites in the alloy system was examined. In the simulation, the primary arms growing in a flowing melt inclined toward the upstream direction, and the deflection angle…
Absolute ages of soils developed on the raised coral reef terraces in Kikai Island in the Ryukyus, Southwest Japan were estimated by using the mean rate of tectonic uplift and glacio-eustatic curve during late Quaternary in the previous paper. In order to estimate the soil age of other areas where the similar soils as…
PreviousNext No AccessSEG Technical Program Expanded Abstracts 2002Total magnetization direction and dip from multiscale edgesAuthors: Matthew HaneyYaoguo LiMatthew HaneyCenter for Wave Phenomena, Department of Geophysics, Colorado School of Mines, Golden, CO 80401 and Yaoguo LiGravity and Magnetics Research Consortiu…
In-situ observation of unidirectional solidification using transparent substance has been performed to investigate the growth direction of solid phase. Cell and/or dendrite, the preferred growth directions of which are not parallel to the heat flow direction, were observed with various solidification conditions. Dimen…
In order to understand the void formation mechanism in electroplated Cu interconnects used in Si-semiconductor devices, microstructure of Cu/CuO/Cu layered films which were prepared on the Si3N4/Si substrates by the sputter-deposition technique was observed by transmission electron microscopy (TEM) and scanning ion mi…
Reaction of [5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrinato]zinc with bipyridyl-type ligands leads to the formation of extended three-dimensional supramolecular architectures sustained by a concerted mechanism of metal–ligand (pyridyl-N⋯Zn) coordination and cooperative intermolecular (O–H⋯OH and O–H⋯N) hydrogen bond…
Rigid-rod vinyl ester resins represent an interesting family of materials. They can be synthesized starting from the corresponding epoxy resin. Due to their composition, they exhibit outstanding properties, such as heat and chemical resistance, high impact, and corrosion resistance. These features, combined with the e…
An argument is given intimating that, for nonsimple materials, the concepts of contact interaction and material symmetry, as well as the bridging concept of stress, should be carefully revised and generalized. .