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Breathing Colloidal Monolayers.

Barry Chi Hong Lai1, Dengping Lyu1, Matthew Chan1

  • 1Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, China.

Journal of the American Chemical Society
|July 19, 2025
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Summary
This summary is machine-generated.

Researchers developed 2D colloidal superlattices that can reversibly expand and contract, transforming between porous structures. This "breathing" behavior offers a new strategy for designing reconfigurable, responsive materials.

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Area of Science:

  • Materials Science
  • Colloidal Science
  • Crystallography

Background:

  • Reversible polymorphic transitions are key in molecular crystals for reconfigurable materials.
  • Translating these transitions to colloidal superlattices presents unique challenges due to particle scale and interactions.

Purpose of the Study:

  • To engineer 2D colloidal superlattices capable of reversible anisotropic expansion and contraction ('breathing').
  • To achieve tunable porosity and structural reconfiguration in colloidal assemblies.

Main Methods:

  • Assembly of polyhedral particles (truncated hexagonal bipyramidal shape) using depletion and AC electric field interactions.
  • Utilizing facet overlapping and dipolar alignment for superlattice formation.
  • Investigating structural reconfiguration kinetics and stimuli-responsive switching.

Main Results:

  • Demonstrated reversible transformation between colloidal superlattice polymorphs with open and closed mesopores.
  • Achieved formation of diverse rhombic superlattices with tunable axial angles and porosity.
  • Observed fast and reversible switching, exhibiting stimuli-responsive 'breathing' behavior.

Conclusions:

  • Developed a strategy for creating responsive biomimetic colloidal materials through 'breathing' superlattices.
  • The findings open avenues for designing reconfigurable colloidal systems with tunable properties.
  • Highlights the potential of engineered particle shapes and interactions in colloidal self-assembly.