Issue
EPL
Volume 88, Number 3, November 2009
Article Number 34001
Number of page(s) 6
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/88/34001
Published online 16 November 2009
EPL, 88 (2009) 34001
DOI: 10.1209/0295-5075/88/34001

Probing viscoelastic properties of a thin polymer film sheared between a beads layer and an ultrasonic resonator

J. Léopoldès and X. Jia

Laboratoire de Physique des Matériaux divisés et Interfaces, Université Paris Est, CNRS UMR 8108 Cité Descartes, 77454 Marne-la-Vallée cedex 2, France, EU

julien.leopoldes@univ-mlv.fr
jia@univ-mlv.fr

received 24 March 2009; accepted in final form 17 October 2009; published November 2009
published online 16 November 2009

Abstract
We report a study of viscoelastic properties of thin polymer films of 10–250 nm at the MHz range. These thin films are confined between a quartz crystal resonator and a millimetric bead layer, producing an increase of both resonance frequency and dissipation of the quartz resonator. For the elastic film, both shear modulus and dynamic viscosity are extracted from these ultrasonic measurements. For the liquid film, the ageing effects are observed on both elastic and dissipative responses and the loss angle of the film is determined. This modified quartz resonator thus provides an effective tool for probing the rheological properties of viscoelastic thin films at ambient environment.

PACS
43.35.+d - Ultrasonics, quantum acoustics, and physical effects of sound.
68.60.Bs - Mechanical and acoustical properties.
46.55.+d - Tribology and mechanical contacts.

© EPLA 2009