Defect Spirograph: Dynamical Behavior of Defects in Spatially Patterned Active Nematics

Mozaffari, Ali; Zhang, Rui; Atzin, Noe; de Pablo, Juan J.

doi:10.48550/arxiv.2105.10841

2021

DOI: 10.48550/arxiv.2105.10841

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Defect Spirograph: Dynamical Behavior of Defects in Spatially Patterned Active Nematics

Ali Mozaffari,

Rui Zhang,

Noe Atzin

et al.

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“…Recent work shows that locally altering activity modifies defect populations [38][39][40][41], and anisotropic smectic sublayers below active nematic sheets can constrain orientation [42]. Such studies demonstrate how underlying sublayer properties have pronounced effects on active dynamics and suggest approaches for engineering control of active matter.…”

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confidence: 93%

Submersed micropatterned structures control active nematic flow, topology, and concentration

Thijssen

Khaladj

Aghvami

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Coupling between flows and material properties imbues rheological matter with its wide-ranging applicability, hence the excitement for harnessing the rheology of active fluids for which internal structure and continuous energy injection lead to spontaneous flows and complex, out-of-equilibrium dynamics. We propose and demonstrate a convenient, highly tunable method for controlling flow, topology, and composition within active films. Our approach establishes rheological coupling via the indirect presence of fully submersed micropatterned structures within a thin, underlying oil layer. Simulations reveal that micropatterned structures produce effective virtual boundaries within the superjacent active nematic film due to differences in viscous dissipation as a function of depth. This accessible method of applying position-dependent, effective dissipation to the active films presents a nonintrusive pathway for engineering active microfluidic systems.

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mentioning

confidence: 93%

Submersed micropatterned structures control active nematic flow, topology, and concentration

Thijssen

Khaladj

Aghvami

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Defect Spirograph: Dynamical Behavior of Defects in Spatially Patterned Active Nematics

Cited by 1 publication

References 55 publications

Submersed micropatterned structures control active nematic flow, topology, and concentration

Submersed micropatterned structures control active nematic flow, topology, and concentration

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