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Publications associées (262)

Carbon diffusion in CVD growth of carbon nanotubes on metal nanoparticles

Diffusion of carbon is the crucial step in chemical vapor deposition (CVD) growth of carbon nanotubes (CNTs) On metal nanoparticles. Using first principles techniques we model the binding and diffusion of carbon atoms and dimers on late transition (Ni, Pd, ...

2008

Dynamics of atmospheric N deposition in a temperate calcareous forest soil

Claire Guenat, Jean-Claude Védy, Isabelle Morier Jaquet

In temperate forest ecosystems, soil acts as a major sink for atmospheric N deposition. A 15N labeling experiment in a hardwood forest on calcareous fluvisol was performed to study the processes involved. Low amounts of ammonium (15NH4 +) or nitrate (15NO3 ...

2008

Effect of metal elements in catalytic growth of carbon nanotubes

Alfredo Pasquarello, Oleg Yazyev

Using first-principles calculations, we model the chemical vapor deposition (CVD) growth of carbon nanotubes (CNT) on nanoparticles of late-transition (Ni, Pd, Pt) and coinage (Cu, Ag, Au) metals. The process is analyzed in terms of the binding of mono- an ...

2008

Mechanical properties of SiOx gas barrier coatings on polyester films

Yves Leterrier

This paper reports the impressive mechanical properties of 1 μm thick carbon-containing SiOx gas barrier coatings, characterised using the uniaxial fragmentation test. Such coatings have been found to act as excellent barriers to water vapour permeation pa ...

2008

Gradual Introduction of Coercive Instruments in Climate Policy

Philippe Thalmann, Andrea Baranzini

Acceptance is the key problem of carbon taxes. This chapter is about acceptance building, ie devising a mechanism for the gradual preparation of the population and the economy in order to implement a carbon tax. It draws on experiences in Switzerland, wher ...

2008

Influence of the catalyst drying process and catalyst support particle size on the carbon nanotubes produced by CCVD

László Forró, Arnaud Magrez, Marijana Mionic Ebersold

Catalytic Chemical Vapour Deposition (CCVD) is considered as the most suitable technique for the large scale and low-cost production of multiwalled carbon nanotubes. We have studied the effect of the preparation process, and of the support particle size on ...

2008

Determination of biodiesel blending percentages using natural abundance radiocarbon analysis: Testing the accuracy of retail biodiesel blends

Jeremy Samuel Arey

Blends of biodiesel and petrodiesel are being used increasingly worldwide. Due to several factors, inaccurate blending of these two mixtures can occur. To test the accuracy of biodiesel blending, we developed and validated a radiocarbon-based method and th ...

2008

On-line monitoring of nine different batch cultures of E-coli by mid-infrared spectroscopy, using a single spectra library for calibration

Urs von Stockar, Ian William Marison, Jonas Schenk, Carla Viscasillas Nadal

A single spectra library was used to monitor on-line, by mid-infrared spectroscopy, nine different batch cultures of Escherichia coli performed with various medium compositions, including chemically complex formulations. Whereas the classic chemometrics ap ...

2008

Are Sphagnum-dominated regenerating cutover bogs C sinks or not? A study in the Swiss Jura Mountains with predictions of climate change impacts on the C balance

Alexandre Buttler, Edward Mitchell, Andy Siegenthaler

Growing peatlands are an important long-term carbon (C) sink and thus play a key role in the global C cycle. Vast surfaces of northern peatlands have been mined for peat and are currently abandoned. In these surfaces, secondary vegetation succession takes ...

2007

The climate dollar

Philippe Thalmann, Marc Vielle

In this technical report we describe a scenario designed by the "Office fédérale de l’environnement" (Mr Romero), this scenario is detailed in table 1. In this scenario we assume that a carbon tax 1 USD2001 per ton of CO2 (i.e. 3.66 USD per ton of carbon) ...

2007

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