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Interface Dynamics of Wet Active Systems.

Fernando Caballero1, Ananyo Maitra2,3, Cesare Nardini4,5

  • 1Brandeis University, Department of Physics, Waltham, Massachusetts 02453, USA.

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Summary
This summary is machine-generated.

We investigate interface roughening in active suspensions. At large scales, dynamics match the |q|KPZ universality class, even with fluid flow, revealing new insights into active matter systems.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Systems
  • Interface Dynamics

Background:

  • Phase-separated active suspensions exhibit complex interfacial behavior.
  • Understanding interface roughening is crucial for predicting material properties and dynamics.
  • Existing models often simplify fluid interactions and substrate effects.

Purpose of the Study:

  • To characterize the universality class of interface roughening in active suspensions on substrates.
  • To investigate the influence of fluid flow and substrate friction on interfacial dynamics.
  • To determine the length scales governing interface randomization.

Main Methods:

  • Analysis of interfacial dynamics in phase-separated active suspensions.
  • Comparison of experimental or simulation data with theoretical models, specifically the |q|KPZ universality class.
  • Examination of early-time dynamics and the impact of system size.
  • Investigation of the role of substrate friction and interfacial tension.

Main Results:

  • Interfacial dynamics at large length and time scales belong to the |q|KPZ universality class, irrespective of long-ranged fluid flows.
  • At early times or in small systems, roughening exponents resemble those in momentum-conserving fluids.
  • A de Gennes-Taupin length scale, dependent on interfacial tension, governs interface randomization when substrate friction is negligible.

Conclusions:

  • The |q|KPZ universality class accurately describes interface roughening in active suspensions under specific conditions.
  • Fluid flow does not alter the large-scale universality class, highlighting robust scaling behavior.
  • Substrate friction and interfacial tension play critical roles in determining the randomization length scale of interfaces.