Development of micromotors using the backflow effect of liquid crystals

Tsuji, Tomohiro; Chono, Shigeomi

doi:10.1016/j.sna.2020.112386

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…While the biochemical aspects of these processes are mostly understood, less is known about the role of physical interactions. Their origin, nevertheless, can be singlehandedly ascribed to the existence of a hydrodynamic phenomenon known as backflow-the hydrodynamic flow resulting from spatial variations of the average microscopic orientation [33][34][35][36][37][38]. In passive liquid crystals, departure from the uniformly oriented equilibrium configuration is generally transient and often originates from a sudden change in the environmental conditions, such as the abrupt variation of an external electric or magnetic field in optical devices [39,40].…”

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confidence: 99%

Hydrodynamic Enhancement ofp-atic Defect Dynamics

2023

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We investigate numerically and analytically the effects of hydrodynamics on the dynamics of topological defects in p-atic liquid crystals, i.e., two-dimensional liquid crystals with p-fold rotational symmetry. Importantly, we find that hydrodynamics fuels a generic passive self-propulsion mechanism for defects of winding number s ¼ ðp − 1Þ=p and arbitrary p. Strikingly, we discover that hydrodynamics always accelerates the annihilation dynamics of pairs of AE1=p defects and that, contrary to expectations, this effect increases with p. Our Letter paves the way toward understanding cell intercalation and other remodeling events in epithelial layers.

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Hydrodynamic Enhancement ofp-atic Defect Dynamics

2023

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“…Nevertheless, their origin can be single-handedly ascribed to the existence of a hydrodynamic phenomenon known as backflow. This effect − whose name directly refers to the "bounce" in the optical transmission of a twisted nematic cell between polarizers after switching off the applied field [29][30][31][32][33][34] − consists of the hydrodynamic flow resulting from spatial variations of the average microscopic orientation. In passive liquid crystals, departure from the uniformly oriented equilibrium configuration is generally transient and often originates from a sudden change in the environmental conditions, such as the abrupt variation of an external electric or magnetic field in optical devices [35,36].…”

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Passive self-propulsion and enhanced annihilation of $p-$atic defects

Krommydas¹,

Carenza²,

Giomi³

2022

Preprint

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We investigate the effects of hydrodynamics on the motion of topological defects in p−atic liquid crystals: i.e. two-dimensional liquid crystals characterised by p−fold rotational symmetry. Using numerical simulations and analytical work, we demonstrate the existence of a generic passive self-propulsion mechanism for defects of winding number s = (p − 1)/p and arbitrary p values. Remarkably, whereas this mechanism is not unique to nematics (i.e. p = 2), nematics are the only type of liquid crystals where passive self-propulsion is thermodynamically stable. Furthermore, we find that hydrodynamics can accelerate the annihilation dynamics of pairs of ±1/p defects and that this effect increases with p before approaching a plateau.

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Hydrodynamic cavitation in Stokes flow of nematic liquid crystal

Yu,

Huang,

et al. 2024

International Journal of Multiphase Flow

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Development of micromotors using the backflow effect of liquid crystals

Cited by 8 publications

References 20 publications

Hydrodynamic Enhancement ofp-atic Defect Dynamics

Hydrodynamic Enhancement ofp-atic Defect Dynamics

Passive self-propulsion and enhanced annihilation of $p-$atic defects

Hydrodynamic cavitation in Stokes flow of nematic liquid crystal

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