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Determination of viscoelastic moduli at a submicrometric scale

Published online by Cambridge University Press:  15 June 1999

C. Basire
Affiliation:
ESPCI/LPQ, Systèmes Interfaciaux à l'Échelle Nanométrique (ESA 7069 du CNRS), 10 rue Vauquelin, 75231 Paris, Cedex 05, France Rhodia Recherches, 52 rue de la Haie Coq, 93308 Aubervilliers Cedex, France
C. Frétigny*
Affiliation:
ESPCI/LPQ, Systèmes Interfaciaux à l'Échelle Nanométrique (ESA 7069 du CNRS), 10 rue Vauquelin, 75231 Paris, Cedex 05, France
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Abstract

From an analysis of the static friction regime of the tip of an atomic force microscope, a method is proposed for determining the viscoelastic modulus of materials which are viscoelastic at the temperature of the experiment. Present experiments consist in displacing the sample in its plane, periodically or at a constant velocity, while measuring the tangential force response of the contact to this shear solicitation. The proposed model permits to determine the relaxation and complex moduli at a sub-micrometric scale. Several experimental confirmations of the description are presented and it is shown that the local moduli measurements compare favorably with macroscopical results.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 1999

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