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Claudio Grimaldi

Cette personne a quitté l’EPFL

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Publications associées (52)

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Study of electrical properties of piezoresistive pastes and determination of the electrical transport

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Sonia Vionnet Menot

A vast class of disordered conducting-insulating compounds close to the percolation threshold is characterized by nonuniversal values of transport critical exponents. The lack of universality implies that critical indexes may depend on material properties ...

2005

Demography of galactic technosignatures

Claudio Grimaldi

Probabilistic arguments about the existence of technological life beyond Earth traditionally refer to the Drake equation to draw possible estimates of the number of technologically advanced civilizations releasing, either intentionally or not, electromagne ...

OXFORD UNIV PRESS2021

Relation between a heterogeneous percolation model for cylinders and phase separation in the lattice fluid problem

Claudio Grimaldi

A relationship based upon analogy is explored between (i) a lattice-based model for percolation by cylinders that employs distinct site types with unequal occupation probabilities in order to capture heterogeneities in the particle dispersion, and (ii) the ...

2018

Impact of tunneling anisotropy on the conductivity of nanorod dispersions

Claudio Grimaldi, Biagio Nigro

While the tunneling conductance between two spherical-like conducting particles depends on the relative interparticle distance, the wave function overlap between states of two rodlike particles, and so the tunneling conductance, depends also on the relativ ...

American Physical Society2014

Electron tunneling in conductor-insulator composites with spherical fillers

Thomas Maeder, Peter Ryser, Claudio Grimaldi, 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

Tunneling conductivity in composites of attractive colloids

Peter Ryser, Claudio Grimaldi, Biagio Nigro

In conductor-insulator nanocomposites in which conducting fillers are dispersed in an insulating matrix, the electrical connectedness is established by inter-particle tunneling or hopping processes. These systems are intrinsically non-percolative and a coh ...

American Institute of Physics2012

Tuning the length dispersion of multi-walled carbon nanotubes by ball milling

László Forró, Arnaud Magrez, Claudio Grimaldi, Richard Gaal, Marijana Mionic Ebersold, Rita Smajda, Primoz Rebernik Ribic

The statistical analysis of the length distribution of catalytic chemical vapour deposition synthesized multi-walled carbon nanotubes cut by planetary ball milling is reported. The nanotube lengths follow a log-normal distribution in a broad range of grind ...

Amer Inst Physics2013

Anisotropy of transport in bulk Rashba metals

Claudio Grimaldi

The recent experimental discovery of three-dimensional (3D) materials hosting a strong Rashba spin-orbit coupling calls for the theoretical investigation of their transport properties. Here we study the zero-temperature dc conductivity of a 3D Rashba metal ...

Amer Physical Soc2017

A complete graph effective medium approximation for lattice and continuum percolation

Claudio Grimaldi

In this paper we introduce an effective medium theory that is capable of describing site percolation in both lattice and continuum three-dimensional systems. By exploiting self-consistency with a complete graph or network of identical conductors, the resul ...

2011

Dimensional effects on the tunneling conductivity of gold-implanted nanocomposite films

Claudio Grimaldi

We study the dependence of the electrical conductivity on the gold concentration of Au-implanted polymethylmethacrylate (PMMA) and alumina nanocomposite thin films. For Au contents larger than a critical concentration, the conductivity of Au-PMMA and Au-al ...

American Institute of Physics2015

Unconventional dc Transport in Rashba Electron Gases

Claudio Grimaldi

We discuss the transport properties of a disordered two-dimensional electron gas with strong Rashba spin-orbit coupling. We show that in the high-density regime where the Fermi energy overcomes the energy associated with spin-orbit coupling, dc transport i ...

American Physical Society2016

Transport properties of nonhomogeneous segregated composites

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

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

Properties and stability of thick-film resistors with low processing temperatures - effect of composition and processing parameters

Thomas Maeder, Claudio Grimaldi, Caroline Marguerite Jacq, Sonia Vionnet Menot

In this work, the properties (sheet-resistance, temperature coefficient and piezoresistance / gauge factor) and stability of thick-film resistors with low firing temperatures (525...650°C) are studied. To this end, two low-melting lead borosilicate glass c ...

2006

Tunneling and percolation transport regimes in segregated composites

Peter Ryser, Claudio Grimaldi, Biagio Nigro

We consider the problem of electron transport in segregated conductor-insulator composites in which the conducting particles are connected to all others via tunneling conductances, thus forming a global tunneling-connected resistor network. Segregation is ...

2012

Optimal percolation of disordered segregated composites

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Niklaus Johner

We evaluate the percolation threshold values for a realistic model of continuum segregated systems, where random spherical inclusions forbid the percolating objects, modellized by hard-core spherical particles surrounded by penetrable shells, to occupy lar ...

2009

Quasiuniversal Connectedness Percolation of Polydisperse Rod Systems

Peter Ryser, Claudio Grimaldi, Biagio Nigro

The connectedness percolation threshold (eta(c)) and critical coordination number (Z(c)) of systems of penetrable spherocylinders characterized by a length polydispersity are studied by way of Monte Carlo simulations for several aspect ratio distributions. ...

American Physical Society2013

Tunneling-percolation origin of nonuniversality: Theory and experiments

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Sonia Vionnet Menot

A vast class of disordered conducting-insulating compounds close to the percolation threshold is characterized by nonuniversal values of transport critical exponent t, in disagreement with the standard theory of percolation which predicts t ...

2005

Electrical transport in onion-like carbon-PMMA nanocomposites

László Forró, Arnaud Magrez, Claudio Grimaldi, Maryam Majidian

We report electrical conductivity measurements of polymethyl-methacrylate filled by onion-like carbon particles with a primary particle size of approximate to 5 nm. We show that the conductivity sigma is exceptionally high even at very low loadings and tha ...

AMER INST PHYSICS2019

Apparent nonuniversality in finite segregated tunneling-percolaiton models

Peter Ryser, Claudio Grimaldi, Niklaus Johner

We investigate the tunneling-percolation mechanism of DC transport nonuniversality for conducting particles of diameter Φ placed in series within the bonds of length Lof a regular lattice model. When L/Φ→∞ the resulting bond conductance distribution functi ...

2007

Tunneling and nonuniversality in continuum percolation systems

Claudio Grimaldi

The values obtained experimentally for the conductivity critical exponent in numerous percolation systems, in which the interparticle conduction is by tunneling, were found to be in the range of t0 and about t0 + ...

2006