| Autor: |
Hokmabad, Babak Vajdi, Dey, Ranabir, Jalaal, Maziyar, Mohanty, Devaditya, Almukambetova, Madina, Baldwin, Kyle A, Lohse, Detlef, Maass, Corinna C |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Phys. Rev. X 11, 011043 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevX.11.011043 |
| Popis: |
To explore and react to their environment, living micro-swimmers have developed sophisticated strategies for locomotion - in particular, motility with multiple gaits. To understand the physical principles associated with such a behavioural variability,synthetic model systems capable of mimicking it are needed. Here, we demonstrate bimodal gait switching in autophoretic droplet swimmers. This minimal experimental system is isotropic at rest, a symmetry that can be spontaneously broken due to the nonlinear coupling between hydrodynamic and chemical fields, inducing a variety of flow patterns that lead to different propulsive modes. We report a dynamical transition from quasi-ballistic to bimodal chaotic motion, controlled by the viscosity of the swimming medium. By simultaneous visualisation of the chemical and hydrodynamic fields, supported quantitatively by an advection-diffusion model, we show that higher hydrodynamic modes become excitable with increasing viscosity, while the recurrent mode-switching is driven by the droplet's interaction with self-generated chemical gradients. We further demonstrate that this gradient interaction results in anomalous diffusive swimming akin to self-avoiding spatial exploration strategies observed in nature. |
| Databáze: |
arXiv |
| Externí odkaz: |
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