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Sökning: WFRF:(Zaccarelli M)

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  • Gerelli, Yuri, et al. (författare)
  • Softness matters : effects of compression on the behavior of adsorbed microgels at interfaces.
  • 2024
  • Ingår i: Soft Matter. - : Royal Society of Chemistry. - 1744-683X .- 1744-6848. ; 20:17, s. 3653-3665
  • Tidskriftsartikel (refereegranskat)abstract
    • Deformable colloids and macromolecules adsorb at interfaces as they decrease the interfacial energy between the two media. The deformability, or softness, of these particles plays a pivotal role in the properties of the interface. In this study, we employ a comprehensive in situ approach, combining neutron reflectometry with molecular dynamics simulations, to thoroughly examine the profound influence of softness on the structure of microgel Langmuir monolayers under compression. Lateral compression of both hard and soft microgel particle monolayers induces substantial structural alterations, leading to an amplified protrusion of the microgels into the aqueous phase. However, a critical distinction emerges: hard microgels are pushed away from the interface, in stark contrast to the soft ones, which remain firmly anchored to it. Concurrently, on the air-exposed side of the monolayer, lateral compression induces a flattening of the surface of the hard monolayer. This phenomenon is not observed for the soft particles as the monolayer is already extremely flat even in the absence of compression. These findings significantly advance our understanding of the key role of softness on both the equilibrium phase behavior of the monolayer and its effect when soft colloids are used as stabilizers of responsive interfaces and emulsions.
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  • Schmidt, Maximilian M., et al. (författare)
  • Interfacial Fluid Rheology of Soft Particles
  • 2023
  • Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 131:25
  • Tidskriftsartikel (refereegranskat)abstract
    • In situ interfacial rheology and numerical simulations are used to investigate microgel monolayers in a wide range of packing fractions, xi(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 xi(2D) at the interface, confirming long-sought predictions of reentrant behavior for Hertzian-like systems.
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