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
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
