Percolation of nonequilibrium assemblies of colloidal particles in active chiral liquids
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910353919574016 |
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| author | Kushwaha, Pragya Maity, Sayan Menon, Anjaly S. Chelakkot, Raghunath Chikkadi, Vijayakumar |
| author_facet | Kushwaha, Pragya Maity, Sayan Menon, Anjaly S. Chelakkot, Raghunath Chikkadi, Vijayakumar |
| contents | The growing interest in the non-equilibrium assembly of colloidal particles in active liquids is driven by the motivation to create novel structures endowed with tunable properties unattainable within the confines of equilibrium systems. Here, we present an experimental investigation of the structural features of colloidal assemblies in active liquids of chiral E. coli. The colloidal particles form dynamic clusters due to the effective interaction mediated by active media. The activity and chirality of the swimmers strongly influence the dynamics and local ordering of colloidal particles, resulting in clusters with persistent rotation, whose structure differs significantly from those in equilibrium systems with attractive interactions, such as colloid-polymer mixtures. The colloid-bacteria mixture displays several hallmark features of a percolation transition at a critical density, where the clusters span the system size. However, a closer examination of the critical exponents associated with cluster size distribution, average cluster size, and correlation length in the vicinity of the critical density suggest strong deviations from the prediction of the standard continuum percolation model. Therefore, our experiments reveal a richer phase behavior of colloidal assemblies in active liquids. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_02423 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Percolation of nonequilibrium assemblies of colloidal particles in active chiral liquids Kushwaha, Pragya Maity, Sayan Menon, Anjaly S. Chelakkot, Raghunath Chikkadi, Vijayakumar Soft Condensed Matter The growing interest in the non-equilibrium assembly of colloidal particles in active liquids is driven by the motivation to create novel structures endowed with tunable properties unattainable within the confines of equilibrium systems. Here, we present an experimental investigation of the structural features of colloidal assemblies in active liquids of chiral E. coli. The colloidal particles form dynamic clusters due to the effective interaction mediated by active media. The activity and chirality of the swimmers strongly influence the dynamics and local ordering of colloidal particles, resulting in clusters with persistent rotation, whose structure differs significantly from those in equilibrium systems with attractive interactions, such as colloid-polymer mixtures. The colloid-bacteria mixture displays several hallmark features of a percolation transition at a critical density, where the clusters span the system size. However, a closer examination of the critical exponents associated with cluster size distribution, average cluster size, and correlation length in the vicinity of the critical density suggest strong deviations from the prediction of the standard continuum percolation model. Therefore, our experiments reveal a richer phase behavior of colloidal assemblies in active liquids. |
| title | Percolation of nonequilibrium assemblies of colloidal particles in active chiral liquids |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2403.02423 |