Hydrodynamic stresses in a multi-species suspension of active Janus colloids
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912229333401600 |
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| author | Tucci, Gennaro Pisegna, Giulia Golestanian, Ramin Saha, Suropriya |
| author_facet | Tucci, Gennaro Pisegna, Giulia Golestanian, Ramin Saha, Suropriya |
| contents | A realistic description of active particles should include interactions with the medium, commonly a momentum-conserving simple fluid, in which they are suspended. In this work, we consider a multi-species suspension of self-diffusiophoretic Janus colloids interacting via chemical and hydrodynamic fields. Through a systematic coarse-graining of the microscopic dynamics, we calculate the multi-component contribution to the hydrodynamic stress tensor of the incompressible Stokesian fluid in which the particles are immersed. For a single species, we find that the strength of the stress produced by the gradients of the number density field is determined by the particles' self-propulsion and chemotactic alignment, and can be tuned to be either contractile or extensile. For a multi-species system, we unveil how different forms of activity modify the stress tensor, and how non-reciprocity in hydrodynamic interactions emerges in an active binary mixture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_07744 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hydrodynamic stresses in a multi-species suspension of active Janus colloids Tucci, Gennaro Pisegna, Giulia Golestanian, Ramin Saha, Suropriya Statistical Mechanics Soft Condensed Matter A realistic description of active particles should include interactions with the medium, commonly a momentum-conserving simple fluid, in which they are suspended. In this work, we consider a multi-species suspension of self-diffusiophoretic Janus colloids interacting via chemical and hydrodynamic fields. Through a systematic coarse-graining of the microscopic dynamics, we calculate the multi-component contribution to the hydrodynamic stress tensor of the incompressible Stokesian fluid in which the particles are immersed. For a single species, we find that the strength of the stress produced by the gradients of the number density field is determined by the particles' self-propulsion and chemotactic alignment, and can be tuned to be either contractile or extensile. For a multi-species system, we unveil how different forms of activity modify the stress tensor, and how non-reciprocity in hydrodynamic interactions emerges in an active binary mixture. |
| title | Hydrodynamic stresses in a multi-species suspension of active Janus colloids |
| topic | Statistical Mechanics Soft Condensed Matter |
| url | https://arxiv.org/abs/2502.07744 |