SHEN, Zaiyi; LINTUVUORI, Juho S

doi:10.1103/PhysRevLett.125.228002

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SHEN, Zaiyi

LINTUVUORI, Juho S
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Physical Review Letters. 2020-11, vol. 125, n° 22

American Physical Society

Resumen en inglés

We study the dynamics of torque driven spherical spinners settled on a surface, and demonstrate that hydrodynamic interactions at finite Reynolds numbers can lead to a concentration dependent and non-uniform crystallisation. At semi-dilute concentrations, we observe a rapid formation of a uniform hexagonal structure in the spinner monolayer. We attribute this to repulsive hydrodynamic interactions created by the secondary flow of the spinning particles. Increasing the surface coverage leads to a state with two co-existing spinner densities. The uniform hexagonal structure deviates into a high density crystalline structure surrounded by a continuous lower density hexatically ordered state. We show that this phase separation occurs due to a non-monotonic hydrodynamic repulsion, arising from a concentration dependent spinning frequency.< Leer menos

DOI

http://dx.doi.org/10.1103/PhysRevLett.125.228002

Proyecto ANR

Guidage des particules artificielles auto-propulsées - ANR-19-CE06-0012

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798