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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Droplets, Wetting, and Microfluidics (joint session DY/CPP)

CPP 10.13: Vortrag

Montag, 9. März 2026, 18:15–18:30, ZEU/0118

Dynamics and Ordering of Microdroplets in Marangoni Flow Field — •Akshay Kallikkunnath and Frank Cichos — Molecular Nanophotonics, Peter Debye Institute for Soft Matter Physics, Faculty of Physics and Earth System Sciences, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany

Collective organization and internal dynamics are intimately linked and emerge across biological scales, with ordered structures providing a framework within which individual constituents remain dynamically active. Here, we study a system of water-in-oil microdroplets containing heat-releasing particles that organize under thermally induced flows. A sub-kelvin temperature increase from the heated particle at the air-oil interface generates Marangoni circulation that advects the droplets. Interactions through the flow field lead to robust ordering, while internal particle dynamics reflect coupling between local thermal gradients and microscale hydrodynamics. This provides a controllable platform to probe self-organization and emergent order by generating flows driven by weak, localized thermal fields in a fully fluid-in-fluid environment.

Keywords: Thermal Marangoni; Microdroplets; Ordering; Interfacial flow