Interfacial rheology measurements

A standard rotational rheometer MCR 302 (Anton Paar) equipped with a Peltier temperature device (P-PTD 200/80I) was used. Temperature was set to 25°C for all measurements. A biconical disk–based measuring system (BiC68-5) in conjunction with an Interfacial Rheology System cell was used to measure the interfacial moduli. A normal force assisted surface detection methodology was used to position the bicone geometry accurately at the buffer-silicone oil interface. A special interfacial analysis software package based on the unique solution of the full flow field for a biconical geometry (49) was used for the calculation of the absolute interfacial rheological properties.