Group formation and collective motion of colloidal rods with an activity triggered by visual perception

Stengele, Philipp; Lüders, Anton; Nielaba, Peter

doi:10.1103/physreve.106.014603

Cited by 8 publications

(3 citation statements)

References 54 publications

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“…The hard spherocylinder model has been also used as a reference system to build up more complex interparticle potentials. These include spherocylinders with dipolar, [40][41][42][43][44] Coulombic 45,46 and patchy [47][48][49] interactions, active spherocylinders, [50][51][52][53] as well as spherocylinders coated with soft layers. 54,55 Moreover, the hard spherocylinder model can be a reasonable approximation to the shape and the interaction of real colloidal particles such as natural clay rods, 56 fd virus, 57 rod-like boehmite particles, 58 polystyrene ellipsoids, 59 silica rods, [60][61][62] as well as PMMA rods 63,64 and ellipsoids.…”

Section: Introductionmentioning

confidence: 99%

Effect of sample height and particle elongation in the sedimentation of colloidal rods

2023

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Section: Introductionmentioning

confidence: 99%

Effect of sample height and particle elongation in the sedimentation of colloidal rods

2023

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“…The hard spherocylinder model has been also used as a reference system to build up more complex interparti- * delasheras.daniel@gmail.com; www.danieldelasheras.com cle potentials. These include spherocylinders with dipolar [40][41][42][43][44], Coulombic [45,46] and patchy [47][48][49] interactions, active spherocylinders [50][51][52][53], as well as spherocylinders coated with soft layers [54,55]. Moreover, the hard spherocylinder model can be a reasonable approximation to the shape and the interaction of real colloidal particles such as natural clay rods [56], f d virus [57], rodlike boehmite particles [58], polystyrene ellipsoids [59], silica rods [60][61][62], as well as PMMA rods [63,64] and ellipsoids [65,66].…”

Section: Introductionmentioning

confidence: 99%

Effect of sample height and particle elongation in the sedimentation of colloidal rods

Eckert¹,

Schmidt²,

Heras³

2023

Preprint

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We study theoretically the effect of a gravitational field on the equilibrium behaviour of a colloidal suspension of rods with different length-to-width aspect ratios. The bulk phases of the system are described with analytical equations of state. The gravitational field is then incorporated via sedimentation path theory, which assumes a local equilibrium condition at each altitude of the sample. The bulk phenomenology is significantly enriched by the presence of the gravitational field. In a suspension of elongated rods with five stable phases in bulk, the gravitational field stabilizes up to fifteen different stacking sequences. The sample height has a non-trivial effect on the stable stacking sequence. New layers of distinct bulk phases appear either at the top, at the bottom, or simultaneously at the top and the bottom when increasing the sample height at constant colloidal concentration. We also study sedimentation in a mass-polydisperse suspension in which all rods have the same shape but different buoyant masses.

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“…For instance, considering an application in the field of microrobots 15 – 18 , it is highly advantageous if the same active units could handle a variety of different geometric objects. Furthermore, it was recently shown that a group’s collective motions can strongly depend on the shape of the individuals 19 – 21 , so there might be additional effects that have to be considered when changing the CP shape.…”

Section: Introductionmentioning

confidence: 99%

Capture and transport of rod-shaped cargo via programmable active particles

Stengele,

Lüders,

Nielaba

2023

Sci Rep

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We study the influence of the cargo shape on the capture and transport process of colloidal rods via swarms of active particles using Brownian dynamics simulations. Starting at random initial conditions, active particles that interact via the Lennard-Jones potential and possess a tuneable speed are utilised to capture passive rods inside a hexagonal cage of individually addressable units. By adjusting the velocity of the individual active particles, the rod can then be transported. To guarantee a successful capture process (with a strong localisation), we find that specific geometric and energetic constraints have to be met; i.e., the length of the rod must approximately be in the vicinity of an odd multiple of the lattice constant of the hexagonal cage, and the Lennard-Jones interaction strength must be in the range of $$3.0 \, k_B T$$ 3.0 k B T to $$6.0 \, k_B T$$ 6.0 k B T . If the cargo aspect ratio gets too large, the subsequent transport of successfully captured rods can fail. For systems where transport is possible, an increase in the cargo aspect ratio decreases the achievable transport velocity. Our work shows that the particle shape must be considered while designing interaction rules to accomplish specific tasks via groups of controllable units.

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Group formation and collective motion of colloidal rods with an activity triggered by visual perception

Cited by 8 publications

References 54 publications

Effect of sample height and particle elongation in the sedimentation of colloidal rods

Effect of sample height and particle elongation in the sedimentation of colloidal rods

Effect of sample height and particle elongation in the sedimentation of colloidal rods

Capture and transport of rod-shaped cargo via programmable active particles

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