Upon adsorption of bovine serum albumin (BSA), the interfacial shear modulus dramatically increased within seconds of the injection, reaching a plateau near 13 mN/m (Figure ), from a baseline in the range of 10 -5 -10 -4 N/m, in good agreement with previous observations . In contrast, upon adsorption of b-casein, only a small step almost undistinguishable from the baseline could be seen (Figure A and Supplementary Figure ), followed by a minor but steady increase in the interfacial shear modulus, overall remaining below 1 mN/m. b-casein was able to form stable emulsions (stable for several weeks to months) and led to very rapid changes in surface pressure (Supplementary Figure ), in agreement with observations reported in the literature for various oils . This behaviour indicates that although both BSA and b-casein rapidly adsorb at the surface of the fluorinated oil Novec 7500, BSA forms a networks displaying significant increase in interfacial shear mechanics, whereas b-casein does not, perhaps forming instead self-assembled monolayers closer in structure to those formed by low molecular weight surfactants. Interestingly, co-adsorption of b-casein and BSA led to a gradual increase in interfacial shear modulus (Figure ), although this was not linearly correlated with the protein feed composition.