Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.228002
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Funding
- IdEx (Initiative d'Excellence) Bordeaux
- French National Research Agency (ANR) [ANR-19-CE06-0012]
- Agence Nationale de la Recherche (ANR) [ANR-19-CE06-0012] Funding Source: Agence Nationale de la Recherche (ANR)
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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 nonuniform crystallization. At semidilute 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 coexisting 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 nonmonotonic hydrodynamic repulsion, arising from a concentration dependent spinning frequency.
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