Materials Literature
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Enhanced electron field emission from hydrogen-free amorphous carbon (a-C) films deposited on ZnO-tip-array-coated Si substrates was studied. Both the ZnO tip array and the a-C films were deposited by filtered arc deposition. Compared with the a-C film deposited on Si substrates, the a-C film on ZnO had a lower thresh…
The double perovskites AA' MnWO 6 (AA' = Ba 2 , SrBa, Sr 2 , SrCa and Ca 2 ) have been prepared as pure powders by a conventional solid-state reaction process. Stoichiometric amounts of BaCO 3 , SrCO 3 , CaCO 3 , MnO and WO 3 were mixed, ground and calcined in a nitrogen atmosphere. The materials have been studied by…
Polymer composites filled with calcium carbonate (CaCO3) nanofillers (<100 nm), and kaolin filler of layered structure, both well suited to create nanocomposites, were analysed. The aim of this study was to investigate the influence of surface properties of the filler and matrix on the adhesion parameters at the inter…
In this study, an AB 5 -type hydrogen-absorbing alloy, Mm ( Ni 0.71 Co 0.14 Al 0.08 Mn 0.06 ) 5.02 , was used as the negative electrode material. The metal-hydride (MH) electrode was charge/discharged over 200 cycles. The discharge capacity of the alloy was 250 mAh g −1 . The specific discharge capacity as a function…
Lead Zirconate Titanate (PZT) ceramic powders with morphotropic phase boundary composition were processed following the reactive calcination method from zirconium titanate and PbO. The powders so obtained have different porosity distribution with an average particle size of ∼0.3 w m. The porosity distribution of the p…
Bulk second-order nonlinearity was generated in BK7 glass at a higher temperature and with a longer poling time than near-surface second-order nonlinearity. The temporal decay of the bulk second-order nonlinearity was slower than that of the near-surface second-order nonlinearity. The thickness of the near-surface non…
Abstract The adsorption and conformation of the anti‐HIV drug AZT, and also thymine and 2′‐deoxythymidine, were studied on Ag colloids by surface‐enhanced Raman spectroscopy, showing that the conformational change induced by the adsorption on an Ag surface is similar to that induced by an alkaline pH, both related to…
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…