Materials Literature
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A high temperature solid oxide fuel cell has been operated in low humidity (3 % H2O) methane using Y0.20Ti0.18Zr0.62O1.90 (YTZ) as the anode. The mechanism of methane electro-oxidation was investigated using ac and dc techniques at different anodic overpotentials and methane concentrations in the temperature range 788…
Abstract Alignment behavior of a discotic liquid crystalline triphenylene (C8OBT) on substrates coated with self-assembled monolayers (SAMs) of alkanethiol and asymmetrical disulfide was investigated by polarized microscopy. Discotic nematic (ND) and rectangular columnar (Colr) phases of C8OBT shows a different alignm…
ZnS 0.05 Se 0.95 nanocrystalline films were deposited onto fused silica and GaAs (100) substrates by the magnetron sputtering technique. The electrical conductivities of the films deposited onto fused silica substrates were measured in the temperature range of 180–300 K. It was observed that the low temperature conduc…
Die Dämpfung mechanischer Schwingungen in Festkörpern ist eine Auswirkung der inneren Reibung. Die Ermittlung der Dämpfungseigenschaften von Werkstoffen ist nicht nur für technische Anwendungen wichtig, sondern stellt eine zerstörungsfreie Analysemethode dar, die Rückschlüsse auf die Mikrostruktur zulässt. Es wird ein…
Semi-rigid polyesters having nitro- or methoxyazobenzene unit in the side chain and calamitic mesogen (biphenyl or 2,5-diphenyl-1,3,4-thiadiazole unit) in the main chain were prepared by melt polycondensation of diethyl isophthalates composed of the azobenzene units with three dioxydiundecanol derivatives of the mesog…
Further to the previous part [Surf. Rev. Lett.8(3/4), 367 (2001)], this part deals with VLEED numerical quantification of the Cu 3 O 2 bond-forming kinetics on the Cu(001) surface. Besides the solution-number certainty that has been ensured, the modeling exercises have enabled the full capacity of VLEED to be explored…
A pure macroscopic two-dimensional numerical model has been developed, capable of capturing the effects of dendritic arm coarsening on the transport phenomena occurring during a binary alloy solidification process. The general continuum conservation equations are aptly modified to take into account shrinkage induced f…
Photochromic diarylethenes with electric carrier (hole) controlling ability for nondestructive readout were investigated. The ionization potential of the photostationary colored diarylethene films was around 5.7–5.8 eV, irrespective of differences in their molecular structures. Good hole injection/transport characteri…
The liquidus surface structure and field of LiB3O5 (LBO) primary crystallization have been revealed in Li2O-B2O3 -MoO3 ternary system. The optimization of charge composition and growth conditions results in large volume optical quality LBO single crystals yielding. Crystallographic properties and real defect structure…
Abstract Perspectives for the manufacture of PVC that does not contain liable groups in the backbone are considered. If achieved, such manufacture will provide a drastic increase in the intrinsic stability of the polymeric products, the possibility of processing PVC with minimal contents or in the total absence of sta…
Resistive properties of point contacts in normal-metal-manganite heterojunctions have been investigated on the base of La 0.7 Sr 0.3 MnO 3 , La 0.8 Sr 0.2 MnO 3 , La 0.8 Ca 0.2 MnO 3 single crystals. At considerable current levels the current-voltage characteristics of point contacts exhibit features in the form of re…
Chromium oxide (Cr 2 O 3 ) solubility was measured in soda lime borosilicate glass from 1400 to 1500 K. The temperature dependence of the solubility increased with increased sodium oxide concentration. The enthalpies of solution for the equilibrium phases were calculated from the solubility data in the temperature ran…
Two series of segmented poly(ester-urethane)s were synthesized from bacterial poly[(R)-3-hydroxybutyrate]-diol (PHB-diol), as hard segments, and either poly(ε-caprolactone)-diol (PCL-diol) or poly(butylene adipate)-diol (PBA-diol), as soft segments, using 1,6-hexamethylene diisocyanate as a chain extender. The hard-se…
The South Dakota Department of Transportation (SDDOT) has made extensive use of chip seal and sand seal surface treatments in the maintenance of their asphaltic concrete (AC) pavements. Such surface treatments have been found to provide a cost-effective means of extending the life of AC pavements in South Dakota. Alth…
Photoluminescence properties of Er3+-doped 70TeO2–30ZnO glasses are investigated. Infrared to visible upconversion has been observed at room temperature in this tellurite glass using a 797 nm excitation laser. A study of the 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions versus excitation laser power shows evidence for…
Fungal influenced corrosion is reviewed for carbon steel and aluminum fuel tanks; carbon steel cables; and painted and unpainted ship holds containing wet and dry cargos, including wood, molasses, fatty oils and cereal. Deterioration of fiber-reinforced composites and glass has also been attributed to fungal species.
Docetaxel, a stoichiometric hydrate containing three water molecules per molecule of drug substance, is thermodynamically stable under ambient conditions of pressure, temperature and relative humidity. Dehydration of this form was subjected to X-ray powder diffraction (XRPD) and thermogravimetric experiments. To obtai…
Coarsening of the fine lamellar structure of a directionally solidified Y 3 Al 5 O 12 (yttrium aluminum garnet, YAG)/Al 2 O 3 eutectic fiber at elevated temperatures was investigated. The fibers were grown continuously by an edge‐defined film‐fed growth (EFG) technique. To study the thermal stability of the lamellar s…
Abstract Lattice parameters of synthetic titanite powder, CaTiOSiO 4 , have been determined between room temperature and 1023 K. Only the e 11 and e 13 components contribute significantly to the strain tensor associated with the antiferroelectric-paraelectric phase transition at T c = 487 K. A finite strain component…
It has been shown that the surface quality of cardiovascular stents has a significant influence on the biocompatibility. In particular, a smooth surface is required. The major objective of the present study is to explore the optimal methods for polishing NiTi stents. Electrochemical polishing was mainly explored, in w…