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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
12:33

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Published on: February 4, 2013

A case of adaptive self-assembly.

Yi Ding1, Yang Yang, Lu Yang

  • 1Beijing National Laboratory for Molecular Science, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China.

ACS Nano
|January 3, 2012
PubMed
Summary

Redox stimuli trigger charge changes in micelles, inducing uptake of charged species and altering micelle shape. This adaptive self-assembly demonstrates a novel approach for controlled uptake and release systems.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Micelles with complex coacervate cores can be formed from oppositely charged polymers.
  • Charge balance in these micelles is crucial for their stability and structure.
  • Previous work proposed redox-induced charge changes could lead to species sequestration.

Purpose of the Study:

  • To directly observe redox-induced uptake of charged species in complex coacervate core micelles.
  • To verify the hypothesis that induced charges drive sequestration of oppositely charged species.
  • To investigate the impact of cargo uptake on micelle morphology and self-assembly.

Main Methods:

  • Preparation of neutral, charge-balanced micelles from iron-coordination polymers and block co-polyelectrolytes.
  • Application of a redox stimulus to induce charge imbalance within the micelles.
  • Uptake of a positively charged, rod-like iron coordination polymer (MEPE) as cargo.
  • Morphological analysis of micelles before and after cargo uptake using techniques not specified but implied by observation.

Main Results:

  • Redox stimulus successfully induced excess charges in the micellar core.
  • The charged species (MEPE) was sequestered into the micellar core, restoring charge balance.
  • Micelle morphology transformed from spherical to banana-shaped bundles and fibers upon cargo uptake.
  • The observed changes confirm redox-induced charge development and subsequent adaptive self-assembly.

Conclusions:

  • The study provides direct evidence of redox-induced charge changes driving cargo uptake in complex coacervate core micelles.
  • Adaptive self-assembly, triggered by redox stimuli, offers a new mechanism for controlling particle composition and shape.
  • These findings open avenues for developing novel redox-triggered uptake and release systems for various applications.