Drainage of a nanoconfined simple fluid: rate effects on squeeze-out dynamics - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2008

Drainage of a nanoconfined simple fluid: rate effects on squeeze-out dynamics

Résumé

We investigate the effect of loading rate on drainage in molecularly thin films of a simple fluid made of quasi-spherical molecules (octamethylcyclotetrasiloxane, OMCTS). We find that (i) rapidly confined OMCTS retains its tendency to organize into layers parallel to the confining surfaces, and (ii) flow resistance in such layered films can be described by bulklike viscous forces if one accounts for the existence of one monolayer immobilized on each surfaces. The latter result is fully consistent with the recent work of Becker and Mugele, who reached a similar conclusion by analyzing the dynamics of squeeze-out fronts in OMCTS [T. Becker and F. Mugele, Phys. Rev. Lett. {\bf 91} 166104(2003)]. Furthermore, we show that the confinement rate controls the nature of the thinning transitions: layer-by-layer expulsion of molecules in metastable, slowly confined films proceeds by a nucleation/growth mechanism, whereas deeply and rapidly quenched films are unstable and undergo thinning transitions akin to spinodal decomposition.
Fichier principal
Vignette du fichier
omcts.pdf (1.58 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00320281 , version 1 (10-09-2008)

Identifiants

Citer

Lionel Bureau, Arnaud Arvengas. Drainage of a nanoconfined simple fluid: rate effects on squeeze-out dynamics. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2008, 78 (6), pp.061501. ⟨10.1103/PhysRevE.78.061501⟩. ⟨hal-00320281⟩
106 Consultations
164 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More