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Video Transcript for Interfacial Tension and Dilatational Rheology:
Interfacial rheology is an exciting and relatively new technique that enables the characterisation of viscoelastic properties of an interface such as modulus and stress relaxation.
These properties arise from the time-dependent interchange of surface active entities between the bulk solution and the interface. In dilatational interfacial rheology, we oscillate the size of a pendant drop and measure the stress throughout. As the interface is created, surfactants take a finite time to adsorb to an equilibrium condition; if the interface is then compressed those surfactants are then forced back into the solution.
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