Probing viscoelastic properties of a thin polymer film sheared between a beads layer and an ultrasonic resonatorJ. 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
received 24 March 2009; accepted in final form 17 October 2009; published November 2009
published online 16 November 2009
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.
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.
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