Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 42: Turbulence
DY 42.8: Vortrag
Mittwoch, 14. März 2018, 12:00–12:15, BH-N 128
Fluid surface particle control and transition to order in wave-based liquid metamaterials — Nicolas Francois1, Hua Xia1, •Horst Punzmann1, Paul Fontana2, and Michael Shats1 — 1Research School of Physics and Engineering, Australian National University, Canberra, Australia — 2Physics department, Seattle University, Seattle, USA
This work demonstrates a method of remotely shaping the trajectories of floating particles on a liquid-gas interface through the external control of surface waves. The underlying principle is a combination of rotating waves, created by a superposition of two orthogonal standing waves, and the Lagrangian drift of particles along closed paths in such waves. This mechanism offers a high degree of control over the particle motion and provides the ability to confine particles to a spatially periodic lattice of nested orbits. The key parameter in the transition from ordered to disordered flow (or vice versa) is the temporal phase shift between the two orthogonal standing waves. We present experimental results on the creation and control of such dynamical liquid interface materials, complemented with a theoretical model of particle trajectories based on the wave-driven Lagrangian drift at the surface of an ideal fluid. In analogy of solid metamaterials which guide waves through matter, liquid metamaterials allow the guidance of matter through control of the imposed surface wave topology. By dynamically shaping a fluid interface using rotating waves, it is possible to effectively produce a 2D material with prescribed transport properties [N. Francois, et. al. Nat. Commun. 7, 14325 (2017)].