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Soft Matter and Biological Physics

Eur. Phys. J. E 2, 153-159

Shear viscosity of polymer and surfactant monolayers

C. Barentin - P. Muller - C. Ybert, J.-F. Joanny - J.-M. di Meglio

Institut Charles Sadron (CNRS UPR022), 6 rue Boussingault, 67083 Strasbourg Cedex, France
joanny@ics.u-strasb.fr

Received: 26 August 1999

Abstract
The surface shear viscosity of monolayers formed at the surface of water by adsorbed polyethyl- eneoxyde and by stearic acid is measured as a function of the surface pressure of the monolayer using a new surface viscometer. The principle of the viscometer is the measurement of the drag force on a circular disk undergoing a uniform translation at the water surface: a hydrodynamic model based on the lubrication approximation allows a calculation of the surface viscosities from the absolute measurement of the drag forces.

PACS
68.10.Et Interface elasticity, viscosity, and viscoelasticity - 83.50.Lh Interfacial and free surface flows; slip

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