2026-06-07T16:09:00Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1258032025-11-07T00:47:30Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Carrillo-Mora, Juan Pablo author Pires Monteiro, Moniellen author Marconi, V. I. author Cordero, María Luisa author Brito López, Ricardo author Soto, Rodrigo 2025-11-06T08:44:38Z 2025-11-06T08:44:38Z 2025-09-26 Carrillo-Mora, J.P., Pires Monteiro, M., Marconi, V.I. et al. Preventing clustering of active particles in microchannels. Commun Phys 8, 374 (2025). https://doi.org/10.1038/s42005-025-02283-y 10.1038/s42005-025-02283-y https://hdl.handle.net/20.500.14352/125803 2399-3650 https://doi.org/10.1038/s42005-025-02283-y https://www.nature.com/articles/s42005-025-02283-y The trajectories of microswimmers moving in narrow channels of widths comparable to their sizes are significantly altered when they encounter another microswimmer moving in the opposite direction. The consequence of these encounters is a delay in the progress of both swimmers, which can be conceptualized as an instantaneous effective backward displacement. Similarly, the modeling of tumble events in bacteria, which occur over a finite time, can be represented as an instantaneous effective displacement in addition to a change in direction. Such effective displacements can be incorporated directly into a kinetic theory for the partial densities of swimmers moving in the channel. The linear analysis of the resulting equation yields the critical density at which clusters emerge. The methodology is then applied to the case of soil bacteria moving in long channels of cross-section 1.8 μm × 1.8 μm. The tracking of the swimmers permits the straightforward acquisition of the effective displacements, which in turn allows the critical density (ρcrit ≃ 0.10 bact/μm) to be predicted prior to cluster formation. The advantage of this proposed approach is that it does not necessitate the determination of an effective density-dependent speed, which is a requisite of the standard motilityinduced phase separation theory. eng Attribution-NonCommercial-NoDerivatives 4.0 International Preventing clustering of active particles in microchannels journal article 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URL https://docta.ucm.es/bitstreams/08360075-1637-4704-99f9-2a538d8edf4a/download File MD5 1d7874ab289b074f02f4ae9ad04f1695 1978138 application/pdf s42005-025-02283-y.pdf