Electrical charging effects on lubrication properties of a model confined ionic liquid
Lundi 16 février 2015 14:00
- Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Rosario CAPOZZA (International School for Advanced Studies (SISSA), Trieste, Italy)
Electrical charging of parallel plates confining a model ionic liquid down to nanoscale distances yields a variety of charge-induced changes in the structural features of the confined film. By means of molecular dynamics simulations, I explore this variety of phenomena using a simple charged coarse-grained model of ionic liquid. With grand-canonical-like conditions to allow the flow of ions in and out of the interplate gap, I simulate the liquid squeezout and obtain effective enthalpy curves showing the local minima that correspond to layering, and predict the switching between one and another under squeezing and charging.
In view of a possible electrical control of friction, I also explore the dependence of friction upon successive squeezout and charging of plates. The actual frictional behavior obtained does depend upon the assumed features and parameters of the model liquid and its interaction with the plates, yet, the broader scenario obtained for charging effects upon boundary lubrication appears of general value.
Contact : cyril.picard@ujf-grenoble.fr
Discipline évènement : (Physique)
Entité organisatrice : (LIPhy)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Mat. Molle/grise)
Site de l'évènement : Domaine Universitaire de St Martin d’Hères
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