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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Dissipative self-assembly of particles interacting through time-oscillatory potentials.

Mario Tagliazucchi1, Emily A Weiss1, Igal Szleifer2

  • 1Department of Chemistry, and.

Proceedings of the National Academy of Sciences of the United States of America
|June 25, 2014
PubMed
Summary

This study introduces a new method for dissipative self-assembly using oscillating interparticle potentials. This approach creates unique structures not possible with equilibrium self-assembly, advancing nonequilibrium organization.

Keywords:
Bond-order parameterFokker–Planck equationYukawa Potentialcolloidselectrostatics

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Soft Matter Physics

Background:

  • Dissipative self-assembly creates order from energy input, enabling structures beyond equilibrium limits.
  • Current design strategies are hindered by limited understanding of nonequilibrium self-organization.
  • Oscillating interparticle potentials offer a novel route to control dissipative self-assembly.

Purpose of the Study:

  • To propose and demonstrate a novel method for dissipative self-assembly using oscillating interparticle potentials.
  • To explore the formation of unique structures inaccessible in equilibrium.
  • To understand the relationship between oscillation frequency and resulting structures.

Main Methods:

  • Brownian dynamics simulations of a binary particle mixture (weak acids/bases).
  • Externally controlled oscillations of pH to mimic interparticle potential changes.
  • Analysis of structure formation under varying oscillation periods relative to diffusional timescales.
  • Investigation of a second system with oscillating particle sizes to show concept generality.

Main Results:

  • Fast pH oscillations (period < diffusional timescale) led to dissipative steady-state structures (dimers, fibers, honeycombs).
  • Slow oscillations resulted in disordered, oscillating structures.
  • Some self-assembled structures were physically inaccessible under equilibrium (fixed pH) conditions.
  • A peak in energy dissipation per cycle characterized the transition from ordered to disordered structures.

Conclusions:

  • Oscillating interparticle potentials provide a versatile strategy for designing dissipative self-assembled structures.
  • The effective potential, an average of oscillatory potentials, governs structure formation in the fast oscillation limit.
  • This work expands the toolkit for creating complex, nonequilibrium materials with tunable properties.