Extensile-Contractile Phase Separation in Dry and Wet Active Nematic Vertex Models

Add to your list(s) Download to your calendar using vCal

• Jan Rozman (University of Oxford)
• Friday 14 June 2024, 14:50-15:20
• Seminar Room 1, Newton Institute.

If you have a question about this talk, please contact nobody.

ADIW04 - Anti-Diffusion in Multiphase and Active Flows

Authors: Jan Rozman and Julia M. Yeomans We study a mixture of extensile and contractile cells using a vertex model extended to include active nematic stresses [1]. The two cell populations phase separate over time. While an increase in contractile activity always aids phase separation, sufficiently high extensile activity reduces the extent of sorting. This can be understood by analysing a small contractile droplet in an extensile bulk: Increasing extensile activity results in the droplet being torn apart by the activity of the bulk, whereas greater contractile activity leads to cells “sticking” together, maintaining a connected droplet for longer. We compare these results with a “wet” vertex model in which substrate-vertex friction is replaced by vertex-vertex friction [2] as a proxy for internal dissipation. This significantly changes the dynamics of the vertex model, allowing, e.g., long range velocity correlations and unidirectional flows in a channel due to nematic activity [3]. References

S.-Z. Lin, M. Merkel, and J.-F. Rupprecht, Phys. Rev. Lett. 130, 058202 (2023). S. Tong, R. Sknepnek, and A. Košmrlj, Phys. Rev. Research 5, 013143 (2023). J. Rozman, Chaithanya K. V. S., J. M. Yeomans, and R. Sknepnek, arXiv:2312.11756 (2023).

This talk is part of the Isaac Newton Institute Seminar Series series.

This talk is included in these lists:

• All CMS events
• Featured lists
• INI info aggregator
• Isaac Newton Institute Seminar Series
• School of Physical Sciences
• Seminar Room 1, Newton Institute
• bld31

Note that ex-directory lists are not shown.