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Cell Co-culture Patterning Using Aqueous Two-phase Systems
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Mixing protocols determine liquid-liquid phase separation dynamics in polyelectrolyte complex coacervation.

Zongpei Wu1, Zhen-Gang Wang2, Shensheng Chen3

  • 1Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.

Nature Communications
|January 10, 2026
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Summary
This summary is machine-generated.

Initial mixing of polymers significantly impacts liquid-liquid phase separation (LLPS) dynamics. Different protocols, like random mixing versus separated domains, lead to distinct coacervation growth rates and scaling behaviors.

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Area of Science:

  • Polymer Science
  • Biophysics
  • Soft Matter Physics

Background:

  • Polyelectrolyte complex coacervation is crucial for biological processes.
  • Understanding the influence of initial conditions on liquid-liquid phase separation (LLPS) is vital.

Purpose of the Study:

  • To investigate how different initial mixing protocols affect polyelectrolyte complex coacervation dynamics.
  • To elucidate the scaling laws governing coacervate domain growth under varied initial conditions.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Simulations analyzed coacervate domain growth kinetics for different initial polymer arrangements.

Main Results:

  • Randomly mixed polycations and polyanions showed initial t1/2 scaling, followed by t1 or t1/3 scaling based on mixing degree.
  • Spatially separated polycations and polyanions exhibited t2/3 early-stage growth, mimicking marine organism LLPS.
  • Preformed polyion pairs demonstrated classical t1/3 coarsening dynamics.

Conclusions:

  • Initial conditions profoundly influence polyelectrolyte complex coacervation LLPS dynamics.
  • Distinct growth mechanisms and scaling laws emerge from different initial mixing strategies.
  • Tailoring initial conditions can control LLPS kinetics in polyelectrolyte systems.