Structure of jammed ellipse packings with a wide range of aspect ratios

Rocks, Sebastian; Hoy, Robert S.

doi:10.1039/d3sm00705g

Cited by 6 publications

(3 citation statements)

References 57 publications

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“…2C that increasing the aspect ratio of the cells also leads to a higher packing fraction, meaning that there is less cell overlap in the population. Interestingly, for non-moving, solid ellipses [10] found a similar dependence of the alignment parameter on the aspect ratio, albeit with a peak near r ≈ 1.3.…”

Section: The Base Model: Self-propulsion and Overlap Avoidancementioning

confidence: 76%

“…Such problems are highly non-trivial, but well-studied for non-moving, completely solid particles, and for symmetric and elongated particles in 2D and 3D (see e.g. [8, 9, 10]). For applications to active matter and in biology see e.g.…”

Section: The Base Model: Self-propulsion and Overlap Avoidancementioning

confidence: 99%

“…in myxobacteria [5], as well as in amoeboid cells [6], or fibroblasts [7]. Alignment of different types of particles has also been observed and modelled in physics [8, 9, 10], however alignment in cells is more challenging to understand, since cells can exhibit much more complicated behaviour than passive matter, see e.g. reviews [11, 12].…”

Section: Introductionmentioning

confidence: 99%

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Derivation and simulation of a computational model of active cell populations: How overlap avoidance, deformability, cell-cell junctions and cytoskeletal forces affect alignment

Leech,

Kenny,

Marcotti

et al. 2024

Preprint

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Collective alignment of cell populations is a commonly observed phenomena in biology. An important example are aligning fibroblasts in healthy or scar tissue. In this work we derive and simulate a mechanistic agent-based model of the collective behaviour of actively moving and interacting cells, with a focus on understanding collective alignment. The derivation strategy is based on energy minimisation. The model ingredients are motivated by data on the behaviour of different populations of aligning fibroblasts and include: Self-propulsion, overlap avoidance, deformability, cell-cell junctions and cytoskeletal forces. We find that there is an optimal ratio of self-propulsion speed and overlap avoidance that maximises collective alignment. Further we find that deformability aids alignment, and that cell-cell junctions by themselves hinder alignment. However, if cytoskeletal forces are transmitted via cell-cell junctions we observe strong collective alignment over large spatial scales.

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Section: The Base Model: Self-propulsion and Overlap Avoidancementioning

confidence: 76%

Section: The Base Model: Self-propulsion and Overlap Avoidancementioning

confidence: 99%

See 1 more Smart Citation

Derivation and simulation of a computational model of active cell populations: How overlap avoidance, deformability, cell-cell junctions and cytoskeletal forces affect alignment

Leech,

Kenny,

Marcotti

et al. 2024

Preprint

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Generating Ultradense Jammed Ellipse Packings Using Biased SWAP

Hoy

2024

J. Phys. Chem. B

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Observation of liquid glass in molecular dynamics simulations

Alhissi,

Zumbusch,

Fuchs

2024

The Journal of Chemical Physics

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Molecular anisotropy plays an important role in the glass transition of a liquid. Recently, a novel bulk glass state has been discovered by optical microscopy experiments on suspensions of ellipsoidal colloids. “Liquid glass” is a disordered analog of a nematic liquid crystal, in which rotation motion is hindered but particles diffuse freely. Global nematic order is suppressed as clusters of aligned particles intertwine. We perform Brownian dynamics simulations to test the structure and dynamics of a dense system of soft ellipsoidal particles. As seen in the experiments and in accordance with predictions from the mode coupling theory, on the time scale of our simulations, rotation motion is frozen but translation motion persists in liquid glass. Analyses of the dynamic structure functions for translation and rotation corroborates the presence of two separate glass transitions for rotation and translation, respectively. Even though the equilibrium state should be nematic, aligned structures remain small and orientational order rapidly decays with increasing size. Long-wavelength fluctuations are remnants of the isotropic-nematic transition.

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Structure of jammed ellipse packings with a wide range of aspect ratios

Abstract: Motivated in part by the recent observation of liquid glass in suspensions of ellipsoidal colloids, we examine the structure of jammed two-dimensional ellipse packings over a much wider range of...

Cited by 6 publications

References 57 publications

Derivation and simulation of a computational model of active cell populations: How overlap avoidance, deformability, cell-cell junctions and cytoskeletal forces affect alignment

Derivation and simulation of a computational model of active cell populations: How overlap avoidance, deformability, cell-cell junctions and cytoskeletal forces affect alignment

Generating Ultradense Jammed Ellipse Packings Using Biased SWAP

Observation of liquid glass in molecular dynamics simulations

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