Reversible active switching of the mechanical properties of a peptide film at a fluid–fluid interface
Entry by Richie Tay for AP 225 Fall 2012
Authors: Annette Dexter, Andrew Malcolm and Anton Middelberg
The ability to control the properties of fluid–fluid interfaces is useful in industrial processes that rely on foams and emulsions, such as oil recovery, waste-water treatment, food processing and pharmaceutical formulation. Surfactants stabilize foams and emulsions by lowering the interfacial tension and generating electrostatic and/or steric barriers to coalescence. They fall into two broad classes: the low-molecular-weight detergents (e.g. polar lipids) we are familiar with, which have high lateral mobility in the interface; and polymers (including proteins), which have limited lateral mobility but form a cohesive interfacial film that prevents the rupture of thin films between bubbles or droplets.