Dispersion of activity at an active–passive nematic interface

Coelho, Rodrigo C. V.; Araújo, Nuno A. M.; Gama, M. M. Telo da

doi:10.1039/d2sm00988a

Cited by 11 publications

(7 citation statements)

References 52 publications

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“…Then, it swims to the center of the channel again under the effect of self-propulsion to form a LAO mode. This type of motion mode can potentially be used to enhance the mixing of suspensions in microfluidic channels at low Reynolds numbers [68][69][70].…”

Section: Sedimentation Of An Elliptical Squirmer With Aspect Ratio C ...mentioning

confidence: 99%

Study of sedimentation characteristics of an elliptical squirmer in a vertical channel

Ying,

Jiang,

et al. 2024

Phys. Scr.

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We used a two-dimensional lattice Boltzmann method to simulate the sedimentation motion of an elliptical squirmer in a vertical channel, taking into account the case of a circular squirmer, aiming to more realistically simulate the swimming of microorganisms in nature. The study in this was divided into two phases. The first phase comprised the numerical calculations of an elliptical squirmer with an aspect ratio of c = 2.0 and revealed three typical motion modes: steady inclined motion, wall-attraction oscillation, and large-amplitude oscillation. It was found that the formation of these three motion modes and transitions between modes are related to the pressure distribution formed between the elliptical squirmer and wall. In addition, significant differences exist between the motions of elliptical and circular squirmers. The force generated by the interaction between the elliptical squirmer and wall does not all point towards its center of mass, resulting in an additional torque on the elliptical squirmer; this is not the situation for the circular squirmer. The second phase of the study simulated squirmers with different aspect ratios (c = 1.0, c = 3.0). It was found that for an elliptical squirmer with an aspect ratio c = 3.0, the large-amplitude oscillation mode (among the above three motion modes) no longer exists. By combining the motion modes of a circular squirmer in the channel, it can be observed that as the aspect ratio c increases, the squirmer’s head direction tends to be more vertical, which may reduce the drag force during swimming.

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Section: Sedimentation Of An Elliptical Squirmer With Aspect Ratio C ...mentioning

confidence: 99%

Study of sedimentation characteristics of an elliptical squirmer in a vertical channel

Ying,

Jiang,

et al. 2024

Phys. Scr.

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“…To this end, it is worth mentioning that, in a similar context of nonmotile bacterial colonies, a recent study by Schwarzendahl et al 55 identified +1/2 and À1/2 topological journal is © The Royal Society of Chemistry 2024 defects. [56][57][58] Their methodology involved computations of the nematic tensorial orientation field, mapping it to continuum fields using a smoothing function and identifying these defects through integration and clustering algorithms. However, it is important to note that a comprehensive investigation of active-nematics, including the specific context of these topological defects, requires a detailed study beyond the current scope of our research.…”

Section: Cell Length Variation and Nematic Ordering In Growing Bacter...mentioning

confidence: 99%

Resource limitation and population fluctuation drive spatiotemporal order in microbial communities

Khandoori,

Mondal,

Ghosh

2024

Soft Matter

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“…Assuming that the director field is uniform, the forces on the top and on the sides of the droplet are, respectively (see Ref. [36] for a similar calculation):…”

Section: Planar Anchoringmentioning

confidence: 99%

Active nematics on flat surfaces: from droplet motility and scission to active wetting

Coelho¹,

Figueiredo²,

Gama³

2023

Preprint

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We consider the dynamics of active nematics droplets on flat surfaces, based on the continuum hydrodynamic theory. We investigate a wide range of dynamical regimes as a function of the activity and droplet size on surfaces characterized by strong anchoring and a range of equilibrium contact angles. The activity was found to control a variety of dynamical regimes, including the selfpropulsion of droplets on surfaces, scission, active wetting and droplet evaporation. Furthermore, we found that on a given surface (characterized by the anchoring and the equilibrium contact angle) the dynamical regimes may be controlled by the active capillary number of suspended droplets. We also found that the active nematics concentration of the droplets varies with the activity, affecting the wetting behaviour weakly but ultimately driving droplet evaporation. Our analysis provides a global description of a wide range of dynamical regimes reported for active nematics droplets and suggests a unified description of droplets on surfaces. We discuss the key role of the finite size of the droplet and comment on the suppression of these regimes in the infinite size limit, where the active nematics is turbulent at any degree of activity.

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Dispersion of activity at an active–passive nematic interface

Abstract: Efficient nutrient mixing is crucial for the survival of bacterial colonies and other living systems known as active nematics. However, the dynamics of this mixing is non-trivial as there is...

Cited by 11 publications

References 52 publications

Study of sedimentation characteristics of an elliptical squirmer in a vertical channel

Study of sedimentation characteristics of an elliptical squirmer in a vertical channel

Resource limitation and population fluctuation drive spatiotemporal order in microbial communities

Active nematics on flat surfaces: from droplet motility and scission to active wetting

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