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Deforming active droplets in viscoelastic solutions.

Prateek Dwivedi1, Atishay Shrivastava1, Dipin Pillai1

  • 1Department of Chemical Engineering, Indian Institute of Technology Kanpur, PIN-370210 Kanpur, Uttar Pradesh, India. mangalr@iitk.ac.in.

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Summary
This summary is machine-generated.

Active droplets in viscoelastic fluids exhibit complex motion. Their shape and swimming mode change with the fluid's viscoelasticity, characterized by the Deborah number (De).

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Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Biophysics

Background:

  • Biological swimmers navigate complex bodily fluids.
  • Active droplets in Newtonian fluids are well-studied.
  • Viscoelasticity of bodily fluids significantly impacts microswimmer dynamics.

Purpose of the Study:

  • To model the motion of active droplets in viscoelastic polymeric solutions.
  • To investigate the effect of viscoelasticity, quantified by the Deborah number (De), on droplet behavior.
  • To explore shape transitions and swimming mode changes in response to varying viscoelasticity.

Main Methods:

  • Utilized a system of micellar solubilization driven active droplets.
  • Tuned viscoelastic properties by adjusting surfactant (fuel) and polymer concentrations.
  • Employed theoretical analysis based on normal stress balance at the droplet interface.

Main Results:

  • At moderate Deborah numbers (De), droplets adopt a steady, non-spherical deformed shape.
  • Theoretical analysis accurately predicts droplet shape based on normal stress balance.
  • At higher De, time-periodic deformations and oscillatory transitions in swimming mode occur.

Conclusions:

  • Active droplet motion in viscoelastic fluids is significantly more complex than in Newtonian media.
  • The Deborah number (De) is a critical parameter governing droplet shape and swimming dynamics.
  • This study reveals novel behaviors of active droplets in complex fluid environments.