Materials Literature
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The time-dependent morphology development in a segmented polyurethane, which was prepared by the reaction of equimolar amounts of 1,4-phenylene diisocyanate ( p PDI) and poly(tetramethylene oxide)glycol of 〈 M n 〉 of 975 g/mol, was investigated. No chain extender was utilized during the synthesis, and the resultant mo…
We report the enhanced thermoelectric properties of PbTe alloyed with antimony telluride (Sb2Te3). The resistivities and absolute values of the Seebeck coefficient for PbTe alloyed with Sb2Te3 increase while the thermal conductivities decrease with rising temperature. A maximum figure of merit, ZT, of 1.17 has been ac…
Successful reconstruction of large-diameter blood vessel in humans has been demonstrated using the tissue engineering technique, but improvement in patency of small-diameter bioartificial vascular graft remains a great challenge. This study reports that granulocyte colony-stimulating factor (G-CSF) can enhance in vivo…
Polycrystalline nickel based superalloys are prone to grain boundary attack by atmospheric oxygen either in the form of time dependent intergranular cracking during dwell time within a low cycle fatigue loading spectrum, known as hold time cracking, or in the form of intercrystalline oxidation at higher temperatures.…
This paper provides an overview of the mechanisms of high frequency (HF) loss in shielded power cables and discusses the challenges in the measurements of cable material properties at HF.
In order to clarify thermodynamic relationships of the various phases of KNbO 3 , enthalpies of formation for cubic ( P m 3 m ), tetragonal ( P 4 m m ), orthorhombic ( B m m 2) and rhombohedral ( R 3 m ) phases of KNbO 3 were calculated using a plane-wave pseudopotential method within a density functional formalism. T…
Haloalkane dehalogenases are enzymes that catalyze the cleavage of the carbon-halogen bond by a hydrolytic mechanism. Genomes of Mycobacterium tuberculosis and M. bovis contain at least two open reading frames coding for the polypeptides showing a high sequence similarity with biochemically characterized haloalkane de…
We report a detailed density functional theory (B3LYP) analysis of the gas-phase H2O2 formation from H2 and O2 on Au3, Au4+, Au5, and Au5-. We find that H2, which interacts only weakly with the Au clusters, is dissociatively added across the Au-O bond, upon interaction with AunO2. One H atom is captured by the adsorbe…
We studied the supramolecular comb−coil block copolymers formed by stoichiometric complexations of an amphiphilic surfactant, dodecylbenzenesulfonic acid (DBSA), with the poly(2-vinylpyridine) (P2VP) blocks in a linear polystyrene- block -poly(2-vinylpyridine) (PS- b -P2VP) and a nonlinear block−arm star copolymer of…
We report the realization of a low-temperature aqueous pathway for the chemical synthesis of zinc oxide (ZnO) nanowires with low defect density and their room-temperature ultraviolet lasing behavior at low pump fluence. The concentration of solutes determined not only the size of individual nanowires, which influences…
A new synthesis procedure has been developed to prepare Au−Ag alloy nanoparticles inside glassy SiO 2 film matrix. Two successive overlapping coating layers were prepared on glass substrate using Au- and Ag-incorporated inorganic−organic hybrid silica sols, respectively. The concentrations of the Au and Ag (3 equivale…
Negative charge carrier transport has been investigated in the columnar mesophases of 2,3,6,7,10,11-hexahexylthiotriphenylene (HHTT), (the best-known conducting discotic liquid crystal because of its high bulk hole mobility) using the time-of-flight method. It was shown that fast electron transport takes place in the…
Alloy 22 (UNS N06022) is a Ni-Cr-Mo-W alloy developed for corrosion resistance in a variety of aggressive environments. Because of its excellent corrosion resistance, Alloy 22 was selected as a candidate container material for the disposal of high-level nuclear waste at the proposed repository at Yucca Mountain, Nevad…
The structural transformations occurring to water from low-density (LDW) to high-density (HDW) regimes have been studied by Brillouin scattering for the first time at temperatures up to 453 K and at pressures up to the solidification point. At ambient temperature (293 K) a discontinuity in pressure response of the sou…
The syntheses, magnetochemistry and crystallography of [Fe(L1)2]I0.5[I3]1.5 (1), [Fe(L1)2][Co(C2B9H11)2]2 (2) and [Fe(L2)2][SbF6]2 (3) (L1 = 2,6-di(pyrazol-1-yl)pyridine; L2 = 2,6-di(3-methylpyrazol-1-yl)pyridine) are described. Compounds 1 and 3 are high-spin between 5-300 K. For 1, this reflects a novel variation of…
A field theory of frictionless grain packings in two dimensions is shown to exhibit a zero-temperature critical point at a nonzero value of the packing fraction. The zero-temperature constraint of force balance plays a crucial role in determining the nature of the transition. Two order parameters, <z>, the deviation o…
Granulated gold films activated by cesium and oxygen are found to produce an intense photoelectron emission band about 100 nm wide at a wavelength of 530 nm with a sensitivity of about 4 mA/W in the visible range. This band is likely to be associated with excitation of surface plasmons. The results obtained indicate t…
Abstract Summary: The objective of this research was to verify the influence of adding increasing amounts of lauric acid on the functional properties of homogenized films made from gelatin, triacetin and a blend of palmitic and stearic acids. The films were characterised with respect to their visual aspect, water vapo…
A piezoelectric 2D-optical micro scanner was fabricated with PZT thick-film actuators prepared using Arc Discharge Reactive Ion-Plating method. Two orthogonal pairs of unimorph actuators were used to compose a double-gimbal structure. The inner and outer actuators were controlled independently. A large elliptical mirr…
Abstract Dry grinding of illite particles has been investigated by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and nitrogen adsorption techniques. Prolonged grinding results in an amorphous illite structure and the mechanochemical effect markedly promotes a reduction in reflection intensit…