Paper Number
IR26                         My Program 

Session
Interfacial Rheology, Surfactants, Foams, and Emulsions

Title
Elastoviscoplastic particle-laden interfaces and their relevance for the stability of multiphase materials

Presentation Date and Time
October 15, 2024 (Tuesday) 2:30

Track / Room
Track 6 / Room 501

Authors (Click on name to view author profile)

  1. Alicke, Alexandra (Eindhoven University of Technology, Department of Mechanical Engineering)
  2. Vermant, Jan (ETH Zurich, Department of Materials)

Author and Affiliation Lines (in printed abstract book)
Alexandra Alicke1 and Jan Vermant2
1Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; 2Department of Materials, ETH Zurich, Zurich, Switzerland

Speaker / Presenter 
Alicke, Alexandra

Keywords
experimental methods; colloids; emulsions; interfacial rheology

Text of Abstract
Particle-laden interfaces have been extensively used due to their superb capabilities of imparting stability in multiphase materials in what is called Pickering-Ramsden stability. Typically, they are used to fully cover the surface of bubbles and droplets. Yet, analogously to bulk materials, the elastoviscoplastic nature can be achieved by different material design routes. Here, we discuss which handles are available to tune these interactions, and consequently the microstructure and rheological behavior of these interfaces. By using custom-built interfacial rheology set ups that enable clean kinematic conditions and combining them with in-situ microscopic observations of the 2D suspension microstructure, we are able to relate the rheological properties to underlying changes in microstructure, not only in shear but also in compression [1]. Finally, we discuss how the measured interfacial rheological properties relate to microscale stability in microfluidic experiments that mimic the main driving forces for coarsening mechanisms [2].

[1] A. Alicke, L. Stricker, and J. Vermant, JCIS, 2023, 652, 317-328
[2] P. Beltramo, M. Gupta, A. Alicke, I. Liascukiene, D. Z. Gunes, C. N. Baroud, and J. Vermant, PNAS, 2017, 114(39), 10373-10378