This paper describes a method for producing tungsten oxide nanostructues in an environmental scanning electron microscope. The growth is observed in real time and offers direct observation of the morphology of the tungsten oxide condensed onto the cooler part of a typical W Scanning Electron Microscope filament. We also find that the growth of nanostructures occurs on timescales much shorter th...

The analysis of XANES and EXAFS in BaO-P20,-WO, and Ca0-P20,-MOO, glasses at the W L,,, and Mo K edges was performed in comparison with a number of crystalline WO,, CaWO,, Na,,WO,, a-MOO,, P-MOO, and amorphous a-WO,, a-MOO, compounds. The results of the EXAFS modelling by two different methods ((1) multi-shell single-scattering model within harmonic approximation and (2) model-independent radia...

served among the 300 strains tested, the mechanism of inhibition by Na2W04 was studied with Aeidithiobacillus flei:rooxidans strain AP19-3. When resting cells of AP19-3 were incubated in O.1 M fi-alanine-SOZbuffer (pH 3.0) with O.1 mM Na2W04 for 1 h, the amount of tungsten bound to the cel)s was 12"glmg protein. The optimum pH for tungsten binding to the resting cells was 2 -3. Approximately 2 ...

The mass absorption coefficients of tungsten and tantalum were measured with soft x-ray photons from 1450 eV to 2350 eV using an undulator source. This region includes the M3, M4, and M5 absorption edges. X-ray absorption fine structure was calculated within a real-space multiple scattering formalism; the predicted structure was observed for tungsten and to a lesser degree tantalum as well. Sep...

BACKGROUND AND PURPOSE We have noted that glue-Lipiodol mixtures harden prematurely in the catheter during embolization of brain arteriovenous malformations. However, we observed that hardening of this embolic material does not occur when tungsten powder is added to the glue mixture. In order to clarify the effect of tungsten powder on the glue mixture, we evaluated the reaction time and hardne...

Abstract. In order to study the effect of carbon impurity in plasma on tungsten first wall, hydrogen-carbon mixed ion beam was irradiated to tungsten. It was found that very small amount of carbon (~0.3% or more) significantly enhanced blister formation. According to XPS analysis, all of tungsten atoms in a top surface were combined with carbon atoms to form tungsten carbide (WC) layer (~6 nm t...

The use of a molecular gold organometallic cluster in chemical vapour deposition is reported, and it is utilized, together with a tungsten oxide precursor, for the single-step co-deposition of (nanostructured) tungsten oxide supported gold nanoparticles (NPs). The deposited gold-NP and tungsten oxide supported gold-NP are highly active catalysts for benzyl alcohol oxidation; both show higher ac...

Precise representation of geometry and energy is essential to properly account for self-shielding effects in tungsten. Up to a factor of 7 overestimation of tungsten decay heat results from homogenization of tungsten and the water cooled heat sink behind it and use of non-selfshielded cross sections in the activation calculations. To correctly estimate tungsten decay heat, 3-D continuous energy...

Synchrotron-based X-ray absorption spectroscopy (XAS) of select surface soil samples obtained from Camp Edwards, Massachusetts, small arms ranges indicate that little tungsten metal remains in the soil and that is not stable in the natural environment. X-ray absorption near edge structure (XANES) studies indicate rapid oxidation of tungsten metal to form tungsten oxides W(VI), polytungstates, t...

Tungsten is a candidate material for ITER as well as other future magnetic fusion energy devices. Tungsten is well suited for certain hsion applications in that it has a high threshold for sputtering as well as a very high melting point. As with all materials to be used on the inside of a tokamak or similar device, there is a need to know the behavior of hydrogen isotopes embedded in the materi...