In earlier works [1,2], we have developed a method for measuring the foamability of liquid solutions. The liquid is placed in a Hele-Shaw cell which is flipped several times, thus generating a 2D foam. By analyzing the pictures of the resulting foam, we are able to quantify both foamability and foam stability of any foaming agent.
In our last paper , we studied Bovine Serum Albumin (BSA) and Sodium Dodecyl Sulfate (SDS) foams, using our “flip foam” method. Protein-based foams exhibit particular characteristics that are emphasized : (i) heterogeneous cellular structures due to bubble size segregation and (ii) high stability of the foam. Some clues are given regarding the formation of heterogeneous structures in such foam systems.
 H.Caps, N.Vandewalle, G. Broze, Phys. Rev. E 73, 065301R (2006) – PDF
 H.Caps, N.Vandewalle, G.Broze, and G.Zocchi, Appl. Phys. Lett. 90, 214101 (2007) – PDF
 M. Krzan, H. Caps, N. Vandewalle, Colloids and Surf. A 438, 112 (2013) – PDF