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Macroscopic Supramolecular Assembly through Electrostatic Interactions Based on a Flexible Spacing Coating.

Qian Zhang1, Chongxian Liu1, Guannan Ju1

  • 1State Key Laboratory of Organic-Inorganic Composites & Beijing Laboratory of Biomedical Materials & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

Macromolecular Rapid Communications
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PubMed
Summary

This study demonstrates macroscopic supramolecular assembly (MSA) of rigid polydimethylsiloxane building blocks using electrostatic interactions and flexible spacing coatings. This advance expands MSA possibilities beyond hydrogels for rigid materials.

Keywords:
electrostatic interactionsflexible spacing coatingmacroscopic supramolecular assemblymultivalencypolyelectrolyte multilayers

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Macroscopic supramolecular assembly (MSA) involves noncovalent interactions of large building blocks (>10 µm).
  • Existing MSA methods are limited to hydrogels, with rare reports for rigid materials due to multivalency challenges.

Purpose of the Study:

  • To demonstrate electrostatic-interaction-driven MSA of rigid polydimethylsiloxane (PDMS) building blocks.
  • To overcome limitations in applying molecular assembly strategies to rigid materials for MSA.
  • To introduce a flexible spacing coating approach for enhanced MSA.

Main Methods:

  • Application of a flexible spacing coating using polyelectrolyte multilayers.
  • Utilizing electrostatic interactions between oppositely charged rigid PDMS building blocks.
  • Employing shaking in water for 5 minutes to induce assembly.
  • Confirmation through controlled experiments in various solvents, ionic solution disassembly, and in situ force measurements.

Main Results:

  • Successful demonstration of MSA for rigid PDMS building blocks.
  • Flexible spacing coating enabled electrostatic-driven assembly of rigid materials.
  • Assembly achieved rapidly (5 min) in water via shaking.
  • Electrostatic interactions were confirmed as the primary driving force.

Conclusions:

  • Flexible spacing coating is a viable strategy for achieving MSA of rigid materials.
  • Electrostatic interactions can effectively drive macroscopic supramolecular assembly of rigid building blocks.
  • This work expands the scope of materials applicable to macroscopic supramolecular assembly.