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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Staged self-assembly of colloidal metastructures.

Qian Chen1, Sung Chul Bae, Steve Granick

  • 1Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|June 27, 2012
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Chemically patchy colloids can be sequentially assembled into complex hierarchical structures. This staged approach allows for tunable valence and the creation of intricate colloidal architectures with multiple levels of complexity.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Supramolecular Chemistry

Background:

  • Chemically patchy colloids offer precise control over self-assembly.
  • Hierarchical structures are crucial for advanced material properties.
  • Existing methods often lack control over multi-stage assembly processes.

Purpose of the Study:

  • To demonstrate a sequential assembly method for creating hierarchical colloidal structures.
  • To control the valence of building blocks at different assembly stages.
  • To explore the formation of complex architectures from triblock spheres.

Main Methods:

  • Utilizing ACB triblock spheres with distinct attractive and repulsive interactions.
  • Employing a two-stage assembly process with controlled activation of interactions.
  • Observing single-particle dynamics using fluorescence optical microscopy.

Main Results:

  • Achieved sequential assembly by modulating A-A and B-B attractions.
  • Observed stepwise polymerization kinetics leading to chains, pores, and networks.
  • Identified three distinct bond geometries (linear, triangular, square) between clusters.

Conclusions:

  • Sequential assembly with tunable valence enables fabrication of complex hierarchical colloidal structures.
  • The demonstrated strategy is generalizable to other patchy colloid systems.
  • This approach provides a versatile route to advanced functional materials.