Concept

Reaction rate constant

Related publications (378)

Multiscale modeling of oxygen diffusion through the oxide during silicon oxidation

We investigate at the atomic scale the oxygen diffusion process occurring during silicon oxidation. First, we address the energetics of several oxygen species in the oxide using density-functional calculations. Our results support the interstitial O-2 mole ...

2004

Modelling diffusion in crystals under high internal stress gradients

William Curtin

Diffusion of vacancies and impurities in metals is important in many processes occurring in structural materials. This diffusion often takes place in the presence of spatially rapidly varying stresses. Diffusion under stress is frequently modelled by local ...

2004

Mechanical spectroscopy of decagonal Al-Cu-Fe-Cr quasicrystalline coatings

Robert Schaller, Nadine Baluc

Mechanical spectroscopy measurements were performed on decagonal quasicrystalline Al-Cu-Fe-Cr coatings of three different thicknesses deposited on a mild steel substrate. The mechanical loss spectra indicate that the internal friction is mostly caused by t ...

2004

Homogeneous hydrogenation of carbon dioxide and bicarbonate in aqueous solution catalyzed by water-soluble ruthenium(II) phosphine complexes

Gabor Laurenczy

The water-soluble Ru(II)-phosphine complex, [{RuCl2(mTPPMS)(2)}(2)] was found a suitable catalyst for the hydrogenation of NaHCO3 to NaHCO2 in aqueous solution under mild conditions with catalyst turnover frequencies (TOFs) in the range of 35-50 h(-1) at 5 ...

2003

Rhodium-sulfonated diphosphine catalysts in aqueous hydroformylation of vinyl arenes: high-pressure NMR and IR studies

Gabor Laurenczy

Hydroformylation of vinyl arenes (p-metboxystyrene and p-fluorostyrene) was performed in aqueous solutions using as catalyst precursor Rh(mu-OMe)(cod) (cod = 1,5-cyclooctadiene) associated with the sulfonated 1,3-diarylphosphines (tetra-sulfonated 1,3 ...

2003

Investigation of the inhibitory effect of silica on the degradation of 1,1,1-trichloroethane by granular iron

Tamar Kohn

Although iron-based permeable reactive barriers are gaining importance for treating groundwater contaminants, little is currently known about the effect of cosolutes on barrier longevity. Because of their corrosion inhibiting properties, dissolved silica s ...

2003

Ozonation of drinking water: Part I. Oxidation kinetics and product formation

Urs von Gunten

The oxidation of organic and inorganic compounds during ozonation can occur via ozone or OH radicals or a combination thereof. The oxidation pathway is determined by the ratio of ozone and OH radical concentrations and the corresponding kinetics. A huge da ...

2003

Control of electron transfer kinetics at boron-doped diamond electrodes by specific surface modification

Ilaria Duo

Diamond films with different levels of doping have been the subject of applications and fundamental research in electrochemistry, opening up a new branch known as the electrochemistry of diamond. The electrochemical properties of diamond mostly depend on t ...

EPFL2003

Polymer nanospray interfaces for on-line electrochemically induced modifications

Tatiana Rohner

The aim of this work has been to design, and fabricate a miniaturized electrospray-type interface for mass spectrometry analysis, which allows the nebulization of solutions by applying a high potential difference between the source and the mass spectromete ...

EPFL2003

Dependence of the O-2 diffusion rate on oxide thickness during silicon oxidation

Alfredo Pasquarello, Angelo Bongiorno

We address the rate of O-2 diffusion through the oxide layer at Si-SiO2 interfaces using an atomic-scale approach. In particular, we investigate the combined effect of a percolative diffusion mechanism and of a dense oxide layer located close to the silico ...

2003

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