Formation, Mechanics, Structure and Stability of Armored Bubbles
Manouk ABKARIAN
Laboratoire des Colloïdes Verres et Nanomatériaux,UMR 5587, Université Montpellier II/CNRS
Jeudi 20/03/2008, 11:00
NIMBE Bât 125, p.157, CEA-Saclay
Colloidal particles have long been used as stabilizers for interfaces
since the pioneering work by Pickering and Ramsden slightly more than a
100 years ago. Since then much work has been done on bulk systems, such
as foam rheology and stability, but only recently has attention been
devoted to the properties of individual bubbles and drops covered with
particles. Indeed, these «armored» bubbles or drops can be considered as
composites materials due to the differing properties of the solid
particles and their fluid interface. After reporting new ways of making
armored interfaces with microfluidics, I will discuss the amazing
mechanical properties of these colloidal armors based around the concept
of topological jamming. Then, I will continue by presenting on-going
simulations and experiments on armored bubbles exploring the origin of
their outstanding stability against dissolution. Finally, I will finish
by describing the unexpected behavior of these bubbles when subjected to
different types of surfactants.