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DY: Fachverband Dynamik und Statistische Physik
DY 31: Poster: Statistical Physics
DY 31.14: Poster
Mittwoch, 20. März 2024, 15:00–18:00, Poster C
Lane formation in gravitationally driven colloid mixtures consisting of up to three different particle sizes — •Kay Hofmann1, Marc Isele2, Artur Erbe3, Paul Leiderer2, and Peter Nielaba2 — 1Universität, Mainz, Deutschland — 2Universität, Konstanz, Deutschland — 3Helmholtz-Zentrum, Dresden, Deutschland
We utilized Brownian dynamics simulations to investigate segregation phenomena of gravitationally driven colloids in two-dimensional confined channels. In the present work, we introduce a third particle species to further our understanding of colloidal systems. The interaction between the colloids is modeled by the Weeks-Chandler-Andersen potential, and the confinement of the colloids is realized by hard walls. A difference in the driving force is established through variation in colloid sizes while maintaining a constant mass density. We observe for binary and ternary systems that a driving force difference induces a transition to lanes. In ternary systems, we investigate the tendency for lane formation in dependence of the medium-sized colloid diameter. Here, we find an optimal ratio between colloid diameters for lane formation in ternary systems. Moreover, we examine the interaction between colloids of varying sizes at the channel walls. Recently, we found that driven large colloids displace smaller ones towards the walls, leading to the formation of small particle lanes during the early stages of simulation. Additionally, we discover that these thin lanes are unstable and gradually dissolve over extended time frames.
Keywords: Lane formation; Colloids; Ternary system; Brownian dynamics; Micro channels