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How colloid-colloid interactions and hydrodynamic effects influence the percolation threshold: A simulation study in alumina suspensions

Publications associées (45)

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Representative Behaviour and Adaptation of Office Occupants in Building Simulation

Darren Robinson, Frédéric Haldi

During the warm summer of 2006 a comprehensive longitudinal field survey of the adaptive actions of occupants, their thermal satisfaction and the coincident environmental conditions was conducted in eight Swiss offices. Based on analysis of these results w ...

EPFL2007

Low firing temperature thick-film piezoresistive composites

Sonia Vionnet Menot

Thick-film technology has found applications on miniaturised hybrid circuits in various fields (automotive electronics, televisions, ...). This technology is also now widely used for the fabrication of force and pressure sensors that use the piezoresistive ...

EPFL2005

Tunneling-percolation origin of nonuniversality: Theory and experiments

Peter Ryser, Claudio Grimaldi, Thomas Maeder, 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

Numerous evidence suggests that thick-film resistors are close to a metal– insulator transition and that tunneling processes between metallic grains are the main source of resistance. By theoretical analysis of various percolative resistor network models w ...

2004

Strain modulation of transport criticality in RuO2-based thick-film resistors

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

We show that in RuO2–glass composites the nonuniversal resistivity exponent can be modulated by an applied mechanical strain, signaled by a logarithmic divergence of the piezoresistive response at the percolation threshold. We interpret this phenomenon as ...

2004

The Costly Path from Percolation to Full Connectivity

Patrick Thiran, Olivier Dousse

Requiring all nodes of a wireless multihop network to be connected is expensive and results in a poor scalability of properties such as transport capacity. We show however that it is no longer the case if we only slightly loosen the connectivity requiremen ...

2004

Effect of composition and microstructure on the transport and piezoresistive properties of thick-film resistors

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

The piezoresistive effect of thick-film resistors has found widespread application in pressure and force sensors due to their high strain-sensitivity, stability and low-cost. The main material requirements for these applications are a high piezoresistive r ...

2004

Critical behaviour of the piezoresistive response in RuO2-glass composites

Peter Ryser, Claudio Grimaldi, Thomas Maeder

We re-analyse earlier measurements of resistance R and piezoresistance K in RuO2-based thick-film resistors (TFRs). The percolating nature of transport in these systems is well accounted by values of the transport exponent t larger than its universal value ...

2003

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We propose a model of transport in thick-film resistors which naturally explains the observed nonuniversal values of the conductance exponent t extracted in the vicinity of the percolation transition. Essential ingredients of the model are the segregated m ...

2003

We have carried out an ab initio molecular dynamics simulation of liquid oxygen, a molecular fluid in which the individual 02 units carry a molecular magnetic moment. In addition to the atomic and electronic structures, our simulation describes the evoluti ...

2003