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Temperature-Controlled, Reversible, Nanofiber Assembly from an Amphiphilic Macrocycle.

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  • 1Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84108, United States.

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Temperature control reversibly switches self-assembled nanostructures between nanofibers and bundles. This molecular design rule for amphiphilic arylene-ethynylene macrocycles (AEMs) offers tunable size and morphology.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Self-assembly of one-dimensional nanostructures is crucial for advanced materials.
  • Amphiphilic arylene-ethynylene macrocycles (AEMs) offer tunable properties for nanostructure formation.

Purpose of the Study:

  • To investigate the temperature-dependent self-assembly of AEMs.
  • To control the morphology and size of resulting nanostructures.

Main Methods:

  • Solution-phase self-assembly of AEMs.
  • Temperature variation to induce morphological changes.
  • Observation of nanostructure morphology and size.

Main Results:

  • One-dimensional nanostructures formed from AEMs.
  • Morphology reversibly switched between nanofibers and bundles with temperature changes.
  • Elevated temperatures increased hydrophobicity of side chains, promoting bundling.

Conclusions:

  • Temperature is a simple and effective parameter for controlling AEM nanostructure assembly.
  • The findings provide a molecular design strategy for temperature-controlled self-assembly of macrocycles.