Materials Literature
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The initial stages of Al(111) oxidation by oxygen were investigated by using x-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy. It was found that surfaces exhibiting no impurities from the Auger electron spectroscopy and low-energy electron diffraction data may show different…
Blends of cellulose (CELL) with polyethylene glycol (PEG) were prepared from a mixed solution in dimethyl sulfoxide (DMSO)-paraformaldehyde (PF) by coagulation in a nonsolvent. The state of miscibility of the blends obtained over the composition range of 95/5 to 30/70 was characterized by wide-angle X-ray diffraction…
The redox processes of hexacyanoferrate doping anions inside thick poly(pyrrole) (PPy) layers are considered to be linked to the oxidation state of the PPy. Charge compensation of the PPy can be provided by the influx/efflux of anions and cations or through the Fe(CN)63–/4– oxidation level. In addition it has been pro…
F(2) excimer-laser irradiation induces two major changes in SiO(2): OH glass impregnated with H(2) molecules. First, the vacuum-UV optical absorption edge is bleached, and the absorption at 157 nm decreases from 0.95 to 0.68 cm(-1) . Second, preexisting free SiOH groups and interstitial H(2) are photochemically conver…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Verena Ziegler, Bernhard A. Wolf; Viscosity and morphology of the two-phase system PDMS/P(DMS-ran…
Pr3+ doped oxyfluoroborate glasses have been prepared with different concentrations of Pr. The absorption, fluorescence, and photoacoustic spectra have been recorded and lifetimes of some levels were measured. The fluorescence decays were found to be non-exponential for the 3P0 level. Fluorescence quenching was observ…
The corrosion behavior of 304 stainless steel was characterized with cyclic voltammetry in a eutectic Li/K and Li/Na carbonate melt under anode and cathode gas of the molten‐carbonate fuel cell (MCFC). The corrosion rate of 304 steel was determined in four different environments of the MCFC with electrochemical method…
The Al2O3-ZrO2 composite was studied by impedance spectroscopy, a non destructive technique that was found to be sensitive to the composite's microstructure. The observed decrease in the zirconia grain and grain boundary conductivities points to compression on zirconia grain by alumina matrix. This effect increased wi…
The notation of crystallography in arbitrary dimensions is considered. Recommended symbols for point-group transformations, geometric crystal classes, families and systems are presented.
The liquidcrystalline thermotropic behaviour of a series of long alkyl chain dimethylammonioalkoxydicyanoethenolates of the type CH3-(CH2)n-1-N+(CH3)2-(CH2)p-O-CO-C-(CN)2 (n=10-18, even values only, with p=2, 3; p=4 for n=16) was analysed through differential scanning calorimetry, X-ray diffraction and polarizing opti…
The syntheses and crystallographic characterization of the linear trinuclear complex [Mo(3)O(4)(TPP)(3)]ClO(4) and the monomeric precursors [MoO(TPP)(OClO(3))] and [MoO(TPP)(OH(2))]ClO(4) are described. The crystallographic analyses of [MoO(TPP)(OClO(3))] and [MoO(TPP)(OH(2))]ClO(4) show that these similar complexes a…
Simulations are carried out to determine how polydispersity (δ) affects the potential energy surface of a colloidal system. Increases in polydispersity are shown to cause the disappearance of potential energy minima, such that energy minima corresponding to homogeneous highly ordered structures exist only for δ&lt…
Polycrystalline CVD diamond is an excellent material for advanced optical applications, especially in the IR spectral range. However, one drawback of diamond is the significant reflection loss of 29%, caused by its high refraction index n = 2.4. We fabricated subwavelength, “moth-eye” antireflective structured (ARS) s…
Mixed (Oxygen Ion and n‐Type) Conductivity and Structural Characterization of Titania‐Doped Stabilized Tetragonal Zirconia, Durán, P., Capel, F., Moure, C., González‐Elipe, A. R., Caballero, A., Bañares, M. A.
In this study polyhydroxybutyrate (PHB), produced by a methanol-utilizing bacteria, was used to prepare microspheres in the 120-200 μm size range for embolization. A solvent evaporation technique was utilized to obtain microspheres in which methylene chloride, distilled water and polyvinyl alcohol were used as the sol…
Asymmetric switching properties were measured and quantified in sol-gel derived PZT thin films. The hysteresis asymmetry is attributed to the presence of an internal bias field that has been correlated with the self-polarization during fabrication. Annealing the sample under a remanent polarization with the polarity o…
We have investigated the generation of pretilt angle for a nematic liquid crystal (NLC) alignment in cells with oblique non-polarized ultraviolet (UV) light irradiation on polyimide (PI) surfaces. It was found that monodomain alignment of the NLC is obtained with an incident angle of 70 degrees and 75 degrees on the P…
In previous investigations, vibration welding, which is suitable for the mass production of small and simple shaped parts, was adjusted to the characteristics of thermoplastic composites. However, because of the small batches in thermoplastic composites manufacturing, especially in today's aircraft industry, there is…
Epitaxial films of W-doped vanadium oxides including W–V2O3, W–VO2 and W–V2O5 were deposited on sapphire (110) by reactive magnetron sputtering of a V–W (1.6 at. % W) alloy target in a range of oxygen partial flows. The deposited films were characterized by x-ray diffraction (XRD), Rutherford backscattering spectromet…
Power‐generation experiments of solid‐oxide fuel cells with Ni/yttria‐stabilized zirconia cermet anodes were carried out by changing the water‐to‐methane ratio in the fuel. To separate the electrochemical reactions occuring on the three‐phase boundary of the anode from the steam‐reforming reactions, premixed gases cor…