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DY: Fachverband Dynamik und Statistische Physik

DY 15: Active Matter II (joint session BP/CPP/DY)

DY 15.7: Vortrag

Dienstag, 19. März 2024, 11:15–11:30, H 1028

Structural Colour from Collective Gliding Bacteria Motion — •Junwei Wang¹, Marina Portoghese², Laura Caton², Colin Ingham³, and Silvia Vignolini¹ — ¹Max Planck Institute of Colloids and Interfaces, Potsdam, Germany — ²University of Cambridge, Cambridge, UK — ³Hoekmine BV, Utrecht, Netherland

We report a type of marine, non-pathogenic, gliding bacteria, Flavobacterium Iridescent 1 (IR1), that grows into a dense active liquid crystal colony, exhibiting structural colour. We demonstrate different crystalline phases arising from collective bacteria motility correlate with varied optical appearances of the colony. We show the hierarchical collective motions of the rod-like bacteria that organize into clusters, monolayer, multi-layers and finally into large scale vortices. We also illustrate how the bacteria colony adapts to confinement of different geometries.

Keywords: active nematics; bacteria biophysics; structural color; nanostructure; emergent