Certificates

We are aware of an issue with certificate availability and are working diligently with the vendor to resolve. The vendor has indicated that, while users are unable to directly access their certificates, results are still being stored. Certificates will be available once the issue is resolved. Thank you for your patience.

(660f) Viscoelastic Characterisation of an Emulsion Drops Coating Via Capsule Compression

Authors: 
Dagastine, R. R., The University of Melbourne
Biviano, M., The University of Melbourne
Berry, J., The University of Melbourne
Böni, L., ETH
Characterising the viscoelastic properties of the interfacial films between oil and water has traditionally been done with interfacial rheological techniques such as bicone shear rheology, and pendant drop dilational rheology. These techniques characterise the behaviour of the interfacial film independent of the drop geometry in an emulsion or the impact of the film properties on drop interactions. We use colloidal probe Atomic Force Microscopy (AFM) to directly compress and dwell on individual emulsion droplets with viscoelastic coatings. The response to deformation of these drops exhibit viscoelastic relaxation behaviour more complicated than traditional interfacial rheological techniques. Through numerical modelling of the compression and relaxation process, we extract viscoelastic parameters of these films on the microscale and correlate this with traditional rheological techniques. We analyse an MCT oil/water interface covered by the whey protein, β-lactoglobulin, then crosslink this interface with glutaraldehyde to observe the changes in the interfacial film and rheological behaviour.