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Stability and rheology of aqueous protein foams : contribution of interfacial properties and involvement of film relaxation dynamics - Stéphane Pezennec

Science et technologie du lait et de l’œuf, UMR1253 Inra—Agrocampus Ouest, Rennes


The stability and flow properties of surfactant-stabilized aqueous foams
are keys to their use in various application contexts. They behave as
yield-stress fluids, in which flow leads to film-scale topological
rearrangements.

Still, the contribution to these features of the properties imparted by
the surfactants to the air-liquid interface is far from fully
understood.

Proteins are amphiphilic, surface-active macromolecules. Their
adsorption to hydrophobic interfaces such as the air—water interface is
not balanced by desorption, and aging of adsorbed protein layers may
result, depending on the protein structure, in the development of
interfacial visco-elasticity.

The sensitivity of protein structure to environmental parameters may be
used to show that small-extent structural modifications have a dramatic
impact on interfacial rheology, film-scale dynamics, foam stability and
foam rheology. Correlating multiple investigation scales helps to shed
light on the contribution of the interfacial rheology to protein foam
properties, in particular through the involvement of film relaxation
dynamics.

Agenda

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