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Reverse osmotic effect in active matter

Row, Hyeongjoo and Brady, John F. (2020) Reverse osmotic effect in active matter. Physical Review E, 101 (6). Art. No. 062604. ISSN 2470-0045.

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In nonequilibrium active matter systems, a spatial variation in activity can lead to a spatial variation in concentration of active particles satisfying, at steady state, the condition nU = const [Schnitzer, Phys. Rev. E 48, 2553 (1993); Tailleur and Cates, Phys. Rev. Lett. 100, 218103 (2008)], where n is the number density and U is the active (swim) speed. We show that this condition holds even when the variation is abrupt and when thermal Brownian motion is present provided that the Péclet number is large. This spatial variation in swim speed and concentration produces a fluid pressure distribution that drives a reverse osmotic flow—fluid flows from regions of high concentration to low.

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Row, Hyeongjoo0000-0003-3623-512X
Brady, John F.0000-0001-5817-9128
Additional Information:© 2020 American Physical Society. Received 18 February 2020; accepted 18 May 2020; published 11 June 2020. This research was supported in part by NSF under Grant No. 1803662.
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Issue or Number:6
Record Number:CaltechAUTHORS:20200611-144523625
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103859
Deposited By: Tony Diaz
Deposited On:11 Jun 2020 22:06
Last Modified:11 Jun 2020 22:06

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