Materials Literature
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Chemical diffusion () and surface exchange (k) coefficients for SrFeO3-δ were measured using an electrochemical cell combined with electrochemical impedance spectroscopy (EIS) and potential step technique (PS) in the temperature range of 850-915°C. A value of ~ 4·10-5 cm2/s and a k value of ~ 8·10-5 cm/s were obtained…
There are several possible applications for rapid heating SOFCs. One is vehicles which operate with dual fuel systems. For example, propane is widely used to provide cab heating for trucks whose main engines run on diesel fuel. Rapid heating SOFCs could be used with the propane/butane for auxiliary heat and power gene…
Crystal structures of (Ba1-xLax)2In2O5+x (x = 0.00, 0.20, 0.30, 0.40, 0.50) were analyzed and electrical conductivity were measured. The Rietveld results for (Ba1-xLax)2In2O5+x (x = 0.20, 0.40) revealed that these oxides belonging to cubic Pm3m space group. This result indicated that the oxide ion vacancies distribute…
A significant interaction was observed between water vapor and ionic or mixed conducting oxides as that found in proton conducting ceramics. For the case of yttrium substituted zirconium oxide (YSZ), the oxygen exchange on the surface is found to be governed by the interaction of water molecule and oxygen vacancy of Y…
This paper introduces a phenomenological algorithm for simulation of rate independent hysteretic responses of shape memory alloys (SMAs) in cyclic uniaxial thermomechanical loads. The algorithm is proposed in a compact differential form that uses only seven well-defined material parameters and is adjustable to a parti…
In order to elucidate the driving forces which promote oriented in-plane crystallographic texture in SrRuO3 thin films deposited on stepped SrTiO3 substrates, a high-temperature x-ray analysis of both SrRuO3 thin films and powders was conducted. Structural phase transitions were found at temperatures near 350 °C and s…
We report the observation of visible cathodoluminescence (CL) of Tb ions implanted into amorphous AlN films produced by sputtering. The implanted samples were subjected to thermal annealing treatment up to 1100 °C to optically activate the incorporated ions. The results show that up to 1000 °C annealing temperature th…
A method for the production of recombinant L-leucine dehydrogenase from Bacillus cereus in pilot scale is described employing the temperature induced runaway replication vector pIET98 and the Escherichia coli host strain BL21. Fed-batch cultivation using a semi-synthetic high-cell densitiy medium was adjusted in 5-L s…
Sr 0.25 Ba 0.75 Nb 2 O 6 (SBN) thin films postannealed at 750 °C for 30 min were epitaxially grown in the [00l] direction on p-type (100) Si substrates by the rf magnetron sputtering method. The capacitance–voltage (C–V) characteristics of Au/SBN/Si capacitors, which depend on postannealing conditions, were measured.…
Silicon carbide and carbon nanostructures were produced by pyrolysis of organosilane or aromatic compounds in nanoporous sol-gel silica glasses. Intense photoluminescence was observed in the visible and the near infrared regions, depending on material processing. Emission bands at 2.97, 2.67, 2.53, 2.41, 2.24, 2.09, 1…
Active uniform films of horseradish peroxidase (HRP) have been prepared by covalent binding on Si/SiO(2) or glass supports previously activated by silanization and succinylation. Labeling by fluorescent or by Electron Spin Resonance (ESR) probes was used to quantify the surface density of active groups and of horserad…
We investigate aging in glassy systems based on a simple model, where a point in configuration space performs thermally activated jumps between the minima of a random energy landscape. The model allows us to show explicitly a subaging behavior and multiple scaling regimes for the correlation function. Both the exponen…
We show that percolation and structural arrest transitions coexist in different regions of the phase diagram of a copolymer-micellar system and relate them to short-range intermicellar attraction. The intermediate scattering function shows a nonergodic transition along a temperature and concentration dependent line. A…
The effect of S segregation to grain boundaries on the intergranular embrittlement of Ni has been studied at room temperature using Auger electron spectroscopy and slow strain rate tensile tests. The grain-boundary S concentration was varied by time-controlled annealing of dilute Ni–S alloy specimens at 625 °C. The du…
In order to clarify the co-doping effect on oxide-ion conductivity in the fluorite-type structure, electrical conductivity was measured for the solid-solution system, Ce1-x-yLaxMyO2-δ (M = Ca, Sr). The electrical conductivity in the Ce1-xLaxO2-x/2 system showed a maximum value at x = 0.15, and then decreased gradually…
The effect of specific chemical functionalities on the adhesion of polymorphonuclear leukocytes (PMNs) under flow was investigated using a set of well-characterized, chemically functionalized surfaces prepared by self-assembly of alkanethiolate monolayers on gold surfaces. Terminal functionalities included CH(3), CH(2…
Hyper-Raman spectroscopy is used to investigate low frequency vibrations of various silica glasses. A strong boson peak is observed. The corresponding modes are inactive in infrared and Raman spectra, and are nonacoustic in nature. The shape of this boson peak essentially matches the total density of vibrational state…
Physico-chemical properties of injectable polymeric implant systems, based on the principle that a water-insoluble polymer dissolved in a biocompatible solvent will precipitate upon contact with water, were studied and utilized to predict the release of proteins from these systems. Polylactide-co-glycolide copolymer (…
Ultrathin, highly organized functionalized alkylthiol monolayers were applied as model substrates for cell growth and protein adsorption studies. The aim of this approach was to improve the understanding of molecular surface determinants required for adhesion-dependent cell growth and proliferation using well-controll…
We present results from Inverse photoemission spectroscopy in the isochromat mode, with angular resolution, from the clean Au(113) surface. To identify the origin of the different resonances we have performed first principles calculations of the bulk band structure in the LMTO formalism. Using the particular character…