Materials Literature
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The unusual redox disproportionation of benzyl alcohol to benzaldehyde and toluene catalysed by the Pd561phen60(OAc)180 giant cluster under anaerobic conditions was found, whereas in an O2 atmosphere the Pd giant cluster catalyses benzyl alcohol oxidation to benzaldehyde and inhibits its further oxidation.
The dynamical behavior of domain walls of triglycine sulfate was studied in the vicinity of phase transition point T c, by dielectric measurement over the frequency range from 1 MHz to 1 GHz. Above T c, the dielectric dispersion appears in the form of one Cole-Cole arc which is related to the critical slowing down. Be…
Ge–SiO2 thin films were prepared by the RF magnetron sputtering technique on p–Si substrates from a Ge–SiO2 composite target. The asdeposited films were annealed in the temperature range of 300–10000C under nitrogen ambience. The structure of films was evaluated by X–ray diffraction, X-ray photoemission spectroscopy a…
The near-infrared to visible upconversion properties of Ni 2+ doped CsCdCl 3 are studied as a function of hydrostatic pressure. At 15 K and ambient pressure, near-infrared excitation of Ni 2+ around 810 nm leads to upconversion luminescence centered around 610 nm. Due to the increase of the ligand field strength with…
A C60-[dimethyl-(β-cyclodextrin)]2 and Nafion chemically modified electrode (CME) has been prepared by solution cast on a gold electrode. The CME can be electroreduced irreversibly in KOH aqueous solution. XPS and SEM were used to characterize the CME and the reduced CME. The reduced CME shows high electrocatalytic ac…
Niobium doped barium titanate was prepared using two procedures. First, doped barium titanate was prepared starting from citrate solutions of all components and second, pure barium titanate powder was obtained from the citrate solutions and after that doped. Besides niobium, a small amount of manganese, as acceptor do…
We have determined the orientational distribution of cyano-substituted side chains of a rubbed polyimide film, and a liquid crystal monolayer adsorbed on the film, by means of optical second harmonic generation. With the orientational distribution of a main chain that was measured in a previous study by means of near-…
A new homologous series of 4-halogeno-N-(4-alkoxysalicylidene) anilines was synthesized. The phase transitions of these homologues were determined using a differential scanning calorimeter and an ordinary polarizing microscope. It is shown that the homologues exhibit liquid crystalline phases as the terminal alkoxyl c…
The resonant frequency of electrochemical quartz crystal microbalance (EQCM) electrodes (carbon, nickel, and aluminum) decreases gradually with time in 1 M LiClO 4 /ethylene carbonate ( EC ) + dimethyl carbonate (DMC) after the immediate frequency shift due to the presence of liquid column on the quartz crystals. It i…
In late summer 1995, intertidal flats situated in the freshwater tidal and brackish reaches of the Schelde estuary were sampled to study the microphytobenthos in the upper estuarine reaches. Diatoms dominated the microphytobenthos community at all sites while coccoid green algae, flagellates or cyanobacteria never con…
Low molecular weight surface-active substances such as fatty acids and alcohols have a detrimental effect on head retention. They weaken the foam films by adsorbing on the bubble surface or on the major foam-generating proteins. This study quantitatively demonstrated that the detrimental effect and the defoaming mecha…
In the use of stainless steels at seawater environment, pitting or crevice corrosion of stainless steels become a problem. It was reported that the potential of stainless steel in natural seawater environment rises more noble than in artificial seawater. On the other hand, it is well known that alloying chromium, moly…
This review article on delayed fracture of bolts covers the following topics: general features of delayed fracture, case histories of in-service failures of high-strength bolts, existing demands for higher-strength bolts and their background, increasing needs for standardization of delayed fracture susceptibility eval…
In this work, we describe the synthesis of two new copper(II) compounds, (Pr-Rad)2 [Cu(opba)].H2O (1) and (Bu-Rad)2[Cu(opba)].2H2O (2) where opba stands for ortho-phenylenebis(oxamato) and RRad+ are nitronyl nitroxide radical cations. From 1 and 2, two new molecule-based magnets [Pr-Rad]2[Mn2{Cu(opba)}3 ].3.3DMSO.5H2O…
The field emission properties of a polycrystalline diamond film with hydrogenated and hydrogen free surfaces have been investigated by monitoring both the emission current–voltage curve and emission site density. A very low turn-on field of electron emission was found to be 0.5 V/μm for the hydrogenated surface and 4…
Unsized AS-4 carbon fibers were subjected to RF plasma etching and/or plasma polymerization coating in order to enhance their adhesion to vinyl ester resin. Ar, N2 and O2 were utilized for plasma etching, and acetylene, butadiene and acrylonitrile were used for plasma polymerization coating. Etching and coating condit…
The molecular conformations and packing of [(tBuCO2)3M2(mu-X)M2(O2CtBu)3], where M = Mo and W, and X = oxalate and perfluoroterephthalate, determined in the solid-state from powder X-ray diffraction analysis, reveal one-dimensional coordination polymers involving pivalate-oxygen to metal interactions (X = perfluoroter…
The effect of the cathode-to-anode area ratio on the normalized power density for solid oxide fuel cells was investigated. A geometrically symmetric cell having a screen printed cathode produced a power density of 0.45 W / cm 2 at 800 ° C . However, using a cathode with a geometric area significantly less than that of…
Graphite crystals were formed from a mixture of poly (vinyl pyrrolidone) (PVP) or polyacrylamide (PAA) pow-der and magnetite powder at 1150-1200°C. The graphite was identified by X ray diffraction and transmission elec-tron microscopy. The carbon yield from PAA at 1200°C was about four times of that from PVP, but PAA…
A simplified method to evaluate the premixing molten core mass is proposed, based on the molten jet breakup length and settling/cooling dynamics of the particles generated from the jet surface. The present method was applied to KROTOS experiments at JRC Ispra with alumina and corium melts, as well as to a prototypic g…