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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Synthesis and characterization of tungsten oxide nanostructures

Hu, Rong, 胡蓉 January 2008 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
32

The chemistry of dinuclear complexes of tungsten containing phosphido ligands

Reinisch, Paul Frederick January 1988 (has links)
No description available.
33

Structure and adsorption studies on the Pt-W(100) system

Reichelt, M. A. January 1987 (has links)
The Pt-W(lOO) system has been studied using Auger spectroscopy. X-ray photoelectron spectroscopy and X-ray photoelectron diffraction. Several different regimes were discerned and characterized; a pseudomorphic first Pt layer, distorted hexagonal Pt overlayers, 3D Pt microcrystallites and alloy films. XPS indicated electron transfer from Pt to W at the W/Pt interface and in the alloy layers. Surface Pt inhibits the dissociative chemisorption of CO via an ensemble effect resulting in enhanced molecular adsorption. Distortion in the pseu-dohexagona! layer results in CO bonding to Pt not typical of Pt(l 11). On alloy films CO appears to bind only at W sites with the bonding modified by neighbouring Pt atoms (ligand effect). Surface Pt inhibits adsorption and dissociation of hydrogen on W. At submonolayer coverages there is evidence for occupation of mixed W-Pt sites. Pseudomorphic Pt shows H2 desorption behaviour not typical of pure Pt surfaces while thicker layers resemble Pt(lll). In the presence of large quantities of Pt, H2 desorption from W sites occurs in a new feature at 270K. In the presence of adsorbed CO, the H2 desorption features are shifted to lower temperature, while CO seems little affected by hydrogen. In some cases new H2 desorption features indicate some local mixing of adsorbed CO and hydrogen. Low coverages of methanol or formaldehyde on W(100) lead to CO and H2 as the only decomposition products while at higher coverages, complexes giving rise to desorption of H2, Co, CH4, H2CO and CH3OH are formed. Small quantities of surface Pt eliminate the formation of these complexes. Methane is also formed via a different intermediate which is observed for Pt coverages < 0.5ML. At higher Pt loadings, adsorption of methanol or formaldehyde on W is inhibited. Thick Pt layers behave like pure Pt surfaces towards decomposition of methanol or formaldehyde giving CO and H2 only as decomposition products. On alloy surfaces, there is evidence for the formation of an H/CO complex with methanol decomposition but not with formaldehyde.
34

New studies of reactions of metal atoms with fluorinated arenes and, in part, with carbenoid species

Seeley, A. J. January 1993 (has links)
No description available.
35

Studies on complexes bearing phosphaallyl, chiral cyclopentadienyl, di- or tri- cyclopentadienyl ligands

Sams, David W. I. January 1994 (has links)
No description available.
36

Helium atom scattering from a stepped tungsten (001) crystal : Investigation of clean and adsorbate induced structures

Hinch, B. J. January 1986 (has links)
No description available.
37

Interpretation of CARS spectra from reactive gas flows

Bruguier, Daniel January 1997 (has links)
No description available.
38

Evolution of particle characteristics in sintered hard metal

Sallom, Zuhair Kamil January 1989 (has links)
No description available.
39

Internal stress and adhesion in laser photoanalytically deposited tungsten films

Borer, Aidan January 1990 (has links)
No description available.
40

Die reaktiwiteit van wolframhoudende katalisatore met behulp van kumeen as toetsreaktant

02 March 2015 (has links)
M.Sc. (Chemistry) / Please refer to full text to view abstract

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