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Liquid-liquid phase separation during amphiphilic self-assembly.

Alessandro Ianiro1,2, Hanglong Wu2,3, Mark M J van Rijt2,3

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Amphiphilic self-assembly can be preceded by liquid-liquid phase separation. This process forms polymer-rich droplets that guide the formation of vesicles, influencing their final structure.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Polymer Science

Background:

  • Amphiphilic molecule self-assembly is crucial in nature and synthesis.
  • Controlling self-assembly structures is key for functionality.
  • Mechanisms of molecular assembly remain incompletely understood.

Purpose of the Study:

  • To investigate the role of liquid-liquid phase separation in amphiphilic self-assembly.
  • To elucidate the formation pathway of vesicular structures from block co-polymers.
  • To understand how initial phase separation influences final assembly properties.

Main Methods:

  • Liquid-phase electron microscopy to visualize structures in situ.
  • Self-consistent field computations for theoretical modeling.
  • Gibbs free energy calculations to determine thermodynamic stability.

Main Results:

  • Observed liquid-liquid phase separation preceding vesicle formation.
  • Identified polymer-rich liquid droplets as precursors to micelles and vesicles.
  • Demonstrated that phase separation impacts vesicle size and membrane thickness.
  • Noted the influence of phase separation on kinetic trapping during self-assembly.

Conclusions:

  • Liquid-liquid phase separation is a critical preceding step in certain amphiphilic self-assembly processes.
  • This phase separation mechanism offers a route to control the structural properties of self-assembled vesicles.
  • Understanding this pathway provides insights into bottom-up fabrication of functional nanomaterials.