Eur. Phys. J. E 3, 143-148
Ascending air bubbles in solutions of surface-active molecules:
Influence of desorption kinetics
Institut Charles Sadron (CNRS UPR022), 6 rue Boussingault,
67083 Strasbourg Cedex, France
Received 16 November 1999 and Received in final form 24 March 2000
Abstract
We present and discuss experiments on bubble rise velocities performed in various
solutions of surface-active molecules; we particularly focus our study on the
role of bulk-surface exchanges. For proteins, the vanishing desorption limit
(irreversible adsorption) can be achieved experimentally and measurements are
found in quantitative agreement with the stagnant cap model. The opposite
limit of fast exchange rates is obtained by using short alcohols that turn out
to slightly influence bubble velocities; a surface remobilization at high
concentrations has been evidenced with isopropyl alcohol.
PACS
68.10.Et Interface elasticity, viscosity, and viscoelasticity -
68.10.Jy Kinetics (evaporation, adsorption, condensation, catalysis, etc.) -
83.70.Hq Heterogeneous liquids: suspensions, dispersions,
emulsions, pastes, slurries, foams, block copolymers, etc.
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
