Interfacial Fluid Rheology of Soft Particles
Maximilian M. Schmidt, José Ruiz‐Franco, Steffen Bochenek, Fabrizio Camerin, Emanuela Zaccarelli, Andrea Scotti
Abstract
In situ interfacial rheology and numerical simulations are used to investigate microgel monolayers in a wide range of packing fractions, ζ_{2D}. The heterogeneous particle compressibility determines two flow regimes characterized by distinct master curves. To mimic the microgel architecture and reproduce experiments, an interaction potential combining a soft shoulder with the Hertzian model is introduced. In contrast to bulk conditions, the elastic moduli vary nonmonotonically with ζ_{2D} at the interface, confirming long-sought predictions of reentrant behavior for Hertzian-like systems.
Topics & Concepts
RheologyCompressibilityMaterials scienceZeta potentialMonolayerParticle (ecology)ThermodynamicsChemical physicsMechanicsNanotechnologyNanoparticlePhysicsComposite materialOceanographyGeologyMaterial Dynamics and PropertiesRheology and Fluid Dynamics StudiesPickering emulsions and particle stabilization