Publications de Gianluca Ambrosetti

Optimal Design of Solar Assisted Hydrothermal Gasification for Microalgae to Synthetic Natural Gas Conversion

François Maréchal, Adriano Viana Ensinas, Alberto Mian, Gianluca Ambrosetti

Catalytic hydrothermal gasification is a promising technology which allows the conversion of wet biomass into methane rich syngas. It consists of three major steps, in which thermal energy has to be supplied at different temperature levels, leading to mult ...

2013

Comment on "Direct Measurement of the Percolation Probability in Carbon Nanofiber-Polyimide Nanocomposites"

Claudio Grimaldi, Gianluca Ambrosetti

American Physical Society2011

Transport properties of nonhomogeneous segregated composites

Peter Ryser, Claudio Grimaldi, Thomas Maeder, Gianluca Ambrosetti, Biagio Nigro

In conductor-insulator composites in which the conducting particles are dispersed in an insulating continuous matrix the electrical connectedness is established by interparticle quantum tunneling. A recent formulation of the transport problem in these kind ...

2011

On the insulator-conductor transition in polymer nanocomposites

Gianluca Ambrosetti

This thesis presents an investigation of the models describing electrical conductivity in polymer nanocomposites, which consist in more or less random dispersions of nanometric conductive fillers like carbon nanotubes, nanofibers or graphene sheets in a po ...

EPFL2010

Solution of the tunneling-percolation problem in the nanocomposite regime

Peter Ryser, Claudio Grimaldi, Thomas Maeder, Gianluca Ambrosetti

We noted that the tunneling-percolation framework is quite well understood at the extreme cases of percolation-like and hopping-like behaviors but that the intermediate regime has not been previously discussed, in spite of its relevance to the intensively ...

2010

Percolation-to-hopping crossover in conductor-insulator composites

Claudio Grimaldi, Gianluca Ambrosetti

Here, we show that the conductivity of conductor-insulator composites in which electrons can tunnel from each conducting particle to all others may display both percolation and tunneling (i.e., hopping) regimes depending on few characteristics of the compo ...

2010

Electron tunneling in conductor-insulator composites with spherical fillers

Peter Ryser, Claudio Grimaldi, Thomas Maeder, Niklaus Johner, Gianluca Ambrosetti

We report on our Monte Carlo calculations of the conductivity of monosized and conducting spherical particles dispersed in a homogeneous matrix, with interparticle transport mechanism given by electron tunneling. We show that our numerical results can be r ...

2009

Percolative properties of hard oblate ellipsoids of revolution with a soft shell

Peter Ryser, Claudio Grimaldi, Niklaus Johner, Gianluca Ambrosetti

We present an in-depth analysis of the geometrical percolation behavior in the continuum of random assemblies of hard oblate ellipsoids of revolution. Simulations were carried out by considering a broad range of aspect-ratios, from spheres up to aspect-rat ...

2008