Materials Literature
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An attempt was made to compare the desorption behavior of the surface oxygen complexes in an inert atmosphere with that in the O 2 -gasification atmosphere. For this purpose, the transient kinetics (TK) with switching 18 O 2 to 16 O 2 was carried out and from this TK experiment the in situ desorption behavior of 18 O…
New metal-free and metal-containing 2,3,7,8,12,13,17,18-octakis[(4-methoxycinnamoyl)oxyalkylthio]tetraazaporphyrins with different polymethylene chain lengths (3,6,8 or 11 methylene groups) were synthesized by esterification of 2,3,7,8,12,13,17,18-octakis(hydroxyalkylthio)tetraazaporphyrins, obtained from 1,2-dicyano-…
Structural, photophysical, and charge transport properties of n -hexyl substituted polysilylenes containing 5, 33 or 67% n -hexylsilyne branching points were investigated. According to WAXD, DSC, and vibrational studies, introduction of branching points partially reduces the high degree of crystallinity of linear poly…
The phase K3[SO4]F was found to be dimorphic, undergoing a reversible tetragonal (β) to cubic (α) phase transition at 585 °C. The room-temperature polymorph, β-K3[SO4]F, is isostructural with Ba3SiO5, as confirmed by Rietveld refinement of X-ray powder diffraction data: a= 7.2961(5), c= 10.854(1)Å, R= 0.0689 and Rwp=…
Three different heteroaromatic charge transfer chromophores, e.g. donor(D)–acceptor(A)-substituted thieno [3,2-b] thiophenes 3 and 4, D-substituted thieno [2,3-c] pyridinium salts 7 and 2-(2′-thienyl)pyridinium salts 10 have been prepared. Alkylchalcogenic ethers were used as D-groups. The molecular first hyperpolariz…
Near-equiatomic NiTi alloys are known to exhibit different transformation sequences associated with different thermomechanical treatment and testing conditions. Although a wide range of experimental data has been accumulated through the past few decades of research, there has been a lack of understanding of the thermo…
TiO2, Mn2O3, Tb4O7, Nb2O5 and WO3 can be doped into yttria-stabilised zirconia (YSZ) and from solid-state solutions. Five basic characteristics are found: (1) The phase of zirconia can be controlled by changing the oxygen vacancy concentration by doping. Dopants with valences lower than four tend to increase the oxyge…
Ordered diblock copolymer blends have recently become the subject of tremendous research interest since they can be used to elucidate the intramicrodomain segregation of blocks differing in length, as well as to identify the molecular and blend parameters yielding phase immiscibility. In this work, we explore the infl…
Crystallization studies on blends of high and low molecular weight poly(ethylene oxide) (PEO) have been carried out to characterize phase behavior and morphology. At low crystallization temperatures, both components cocrystallize into a common crystal lattice. The thickness of the cocrystal is found to vary with the b…
The layer of nickel hydroxide was formed electrochemically on the reduced surface of polycrystalline Ni in 1 M KOH. The layer thickness of 8.5 nm, estimated by an electrochemical method, corresponded to about 10 monolayers of Ni(OH) 2 . In situ atomic force microscopy (AFM) with the tip fixed was applied to monitor th…
By electrical resistivity measurements during isothermal holding in single- and poly- crystals of a Cu-29.1Al-3.6Ni (at%) alloy exhibiting a thermoelastic martensitic transformation, we found that the martensitic transformation occurs after some incubation time during isothermal holding at a temperature higher than Ms…
The adsorption and reaction of formic acid, HCOOH, on monolayer and multilayer palladium supported on a Mo(110) surface have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). On multilayer palladium, formic acid adsorbs molecularly at 100 K and d…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Novel Type of Cyanomethylation Reaction of Diarylethenes with Acetonitrile Photosensitized by Benzophenone in the Presence of tert-ButylamineToshiaki Yamashita, Masahide Yasuda, Motonori Watanabe, Ryuji Kojima, Kimiko Tanabe, and Kensuke ShimaView Author Information Departmen…
Ternary fluorozirconate glasses in the systems ZrF 4 −BaF 2 −NaF and ZrF 4 −BaF 2 −LiF have been examined by infrared and Raman spectroscopies. The glass compositions were constrained along compositional joins with a constant Ba/Na (Li) ratio = 1 or a constant F/Zr ratio = 5 (5.5). The high-frequency Raman and IR band…
The corrosion behavior of Zr alloys depends on the kind, size, and distribution of the intermetallic second-phase particles. TEM examinations of Zr-Sn-Fe-Cr alloys irradiated in PWRs at temperatures between 300 and 370°C and fast fluences in the range of 5E21 to 1.3E22 cm-2 have been performed to study the irradiation…
The occurrence of platelet phases in equiax, directionally solidified (DS), and single crystal (SC) turbine blades, vanes, and integral wheels was investigated.Examples of platelet phases in turbine components made from low carbon PWA1480, Cl03 (or PWA1483, AF56, or SX792), IN792+Hf (or ClOl), lN939, lN6203, and GTDll…
This study investigates the stoichiometry and the thermal stability of K(+)- and CO(3)(2)(-)-containing apatites (KCAp's) obtained by the hydrolysis of monetite. The analysis results of the samples after drying reveal that the KCAp's start to lose carbonate at temperatures </= 400 degrees C. The predominant substituti…
A double submerged impinging jet (DSIJ) cell has been built allowing an identical hydrodynamic regime to be established on both faces of a bipolar electrode consisting of either a Pt sheet or a free-standing polypyrrole (PPy) membrane. Both electrode materials have been studied in this cell, in the presence of electro…
A new type of self-assembled porphyrin/phthalocyanine multilayer film is prepared by alternating deposition of oppositely charged rigid planar molecules; the deposition process and photochemical and photophysical properties are studied in detail.
The equilibrium conditions for two-dimensional (cylindrical) solid−liquid−fluid systems are developed, taking into account the possibility of constraints imposed on the motion of the contact lines. The solid surface is assumed to be rigid, insoluble, and nonreactive, but it may be rough or heterogeneous or both. The l…