Active fluids at circular boundaries: swim pressure and anomalous droplet ripening

Soft Matter
Tayeb Jamali, Ali Naji

Abstract

We investigate the swim pressure exerted by non-chiral and chiral active particles on convex or concave circular boundaries. Active particles are modeled as non-interacting and non-aligning self-propelled Brownian particles. The convex and concave circular boundaries are used to model a fixed inclusion immersed in an active bath and a cavity (or container) enclosing the active particles, respectively. We first present a detailed analysis of the role of convex versus concave boundary curvature and of the chirality of active particles in their spatial distribution, chirality-induced currents, and the swim pressure they exert on the bounding surfaces. The results will then be used to predict the mechanical equilibria of suspended fluid enclosures (generically referred to as 'droplets') in a bulk with active particles being present either inside the bulk fluid or within the suspended droplets. We show that, while droplets containing active particles behave in accordance with standard capillary paradigms when suspended in a normal bulk, those containing a normal fluid exhibit anomalous behaviors when suspended in an active bulk. In the latter case, the excess swim pressure results in non-monotonic dependence of the inside droplet pr...Continue Reading

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Citations

May 7, 2020·Soft Matter·Simin YeMingcheng Yang
Aug 4, 2020·Soft Matter·Suchismita Das, Raghunath Chelakkot
Oct 3, 2019·Physical Review. E·Sonja TaramaHartmut Löwen
Sep 25, 2020·Scientific Reports·Mahmoud Sebtosheikh, Ali Naji
Oct 21, 2020·Physical Review. E·Mahdi Zarif, Ali Naji
Mar 20, 2021·Physical Review. E·Zahra Fazli, Ali Naji
Mar 8, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Gieberth Rodriguez-LopezJhoan Toro-Mendoza

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