Curvature-dependent tension and tangential flows at the interface of motility-induced phases

Soft Matter
Adam PatchM Cristina Marchetti

Abstract

Purely repulsive active particles spontaneously undergo motility-induced phase separation (MIPS) into condensed and dilute phases. Remarkably, the mechanical tension measured along the interface between these phases is negative. In equilibrium this would imply an unstable interface that wants to expand, but these out-of-equilibrium systems display long-time stability and have intrinsically stiff boundaries. Here, we study this phenomenon in detail using active Brownian particle simulations and a novel frame of reference. By shifting from the global (or laboratory) frame to a local frame that follows the dynamics of the phase boundary, we observe correlations between the local curvature of the interface and the measured value of the tension. Importantly, our analysis reveals that curvature drives sustained local tangential motion of particles within a surface layer in both the gas and the dense regions. The combined tangential current in the gas and local "self-shearing" of the surface of the dense phase suggest a stiffening interface that redirects particles along itself to heal local fluctuations. These currents restore the otherwise wildly fluctuating interface through an out-of-equilibrium Marangoni effect. We discuss the im...Continue Reading

References

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Citations

Mar 5, 2020·Soft Matter·Thomas Speck
Apr 18, 2020·Soft Matter·Rodrigo C V CoelhoMargarida M Telo da Gama
Jun 25, 2020·Soft Matter·Matteo PaoluzziM Cristina Marchetti
Aug 4, 2020·Soft Matter·Suchismita Das, Raghunath Chelakkot
Mar 10, 2019·The Journal of Chemical Physics·Clara Del Junco, Suriyanarayanan Vaikuntanathan
Jan 18, 2020·Physical Review Letters·Sophie HermannMatthias Schmidt
Jul 9, 2020·Physical Review Letters·R ZakineF van Wijland
Mar 7, 2020·Physical Review Letters·L CapriniA Puglisi
Dec 24, 2019·Physical Review Letters·Suvendu MandalHartmut Löwen
Feb 15, 2020·Physical Review Letters·Adam Wysocki, Heiko Rieger
Dec 21, 2019·Soft Matter·Thomas Kolb, Daphne Klotsa
Dec 25, 2019·Physical Review. E·Sophie HermannMatthias Schmidt
Jan 27, 2021·Soft Matter·P D NetaC S Dias
Oct 31, 2020·Physical Review Letters·Xia-Qing ShiAlexandre Solon
Jan 9, 2021·The Journal of Chemical Physics·Austin R DulaneyJohn F Brady
Jun 16, 2021·Soft Matter·Nicholas LauersdorfDaphne Klotsa
Jul 18, 2021·Physical Review. E·Sven AuschraKlaus Kroy
Jul 6, 2021·Soft Matter·Austin R Dulaney, John F Brady
Aug 24, 2021·Physical Review Letters·G FaustiC Nardini

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Software Mentioned

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