Locomotion of magnetoelastic membranes in viscous fluids

Brisbois, Chase Austyn; Cruz, Mónica Olvera de la

doi:10.1103/physrevresearch.4.023166

Cited by 4 publications

(5 citation statements)

References 46 publications

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“…Unlike magnetoelastic membranes ( 44 , 45 ), which can be actuated by large nonreciprocal deformations as interparticle movements are confined by polymer linkers, our microtubes propel as rigid wholes, avoiding dramatic hydrodynamic drags for propulsion efficiency.…”

Section: Resultsmentioning

confidence: 99%

Colloidal tubular microrobots for cargo transport and compression

Wang,

Sprinkle,

Bisoyi

et al. 2023

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

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Microrobot swarms have seen increased interest in recent years due to their potentials for in vivo delivery and imaging with cooperative propulsion modes and enhanced imaging signals. Yet most swarms developed so far are limited to dense particle aggregates, far simpler than complicated three-dimensional assemblies of anisotropic particles. Here, we show via assembly path design that complex hollow tubular structures can be assembled from simple isotropic colloidal spheres and those complicated, metastable, microtubes can be formed from simple, energetically favorable colloidal membranes. The assembled microtubes can remain intact and roll under a precessing magnetic field, with propulsion directions and velocities precisely controlled by field components. The hollow spaces inside enable these tubular microrobots to grab, transport, and release cargos on command. We also demonstrate unique compressing and uncompressing capabilities with our tubular microrobots, making them effective microtweezers. Our work shows that complicated microrobots can be transformed from simple assemblies, providing an insight on building micromachines.

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Section: Resultsmentioning

confidence: 99%

Colloidal tubular microrobots for cargo transport and compression

Wang,

Sprinkle,

Bisoyi

et al. 2023

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

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“…Theoretical work confirms that an active actomyosin network or a BZ chemical reaction on a deformable membrane display autonomous shape changes including a buckling instability that can ultimately lead to motility ( 41 – 43 ). Motile soft robots have also been engineered from 2D membranes powered with a magnetic field ( 44 – 46 ). Therefore, as a first step, 2D shape-changing hydrogels, which have been developed recently, could be made BZ active to generate autonomous folding-unfolding of their structure ( 47 , 48 ).…”

Section: Discussionmentioning

confidence: 99%

Collective chemomechanical oscillations in active hydrogels

Blanc,

Agyapong,

Hunter

et al. 2024

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

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We report on the collective response of an assembly of chemomechanical Belousov-Zhabotinsky (BZ) hydrogel beads. We first demonstrate that a single isolated spherical BZ hydrogel bead with a radius below a critical value does not oscillate, whereas an assembly of the same BZ hydrogel beads presents chemical oscillation. A BZ chemical model with an additional flux of chemicals out of the BZ hydrogel captures the experimentally observed transition from oxidized nonoscillating to oscillating BZ hydrogels and shows this transition is due to a flux of inhibitors out of the BZ hydrogel. The model also captures the role of neighboring BZ hydrogel beads in decreasing the critical size for an assembly of BZ hydrogel beads to oscillate. We finally leverage the quorum sensing behavior of the collective to trigger their chemomechanical oscillation and discuss how this collective effect can be used to enhance the oscillatory strain of these active BZ hydrogels. These findings could help guide the eventual fabrication of a swarm of autonomous, communicating, and motile hydrogels.

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“…We define the drag torque according to a Rayleigh viscous dissipation function P added to the Euler–Lagrange (EL) equation, 29 where = d α /d t , and L = T − U is the Lagrangian, where T is the kinetic energy and U is the potential energy. In a manner similar to previous work on magnetoelastic membranes, 30 the EL equation is constructed from the interactions of superparamagnetic particles moving in a viscous fluid. Furthermore, in a Stokes regime, acceleration terms can be neglected leaving us with the simple form…”

Section: Modelmentioning

confidence: 99%

“…The reduced field frequency defines the relationship between the rod response time and the field precession period. While ω ′ is a magnetoviscous parameter, 30 leaving it as reduced frequency intuitively reflects its role as a scaled frequency. Therefore, it is easy to see the β curve for a particular θ in Fig.…”

Section: Modelmentioning

confidence: 99%