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Arrested coalescence in structured liquids.

Peifan Li1, Weixiao Feng1, Yunhui Wen1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China.

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Researchers developed a novel method to structure liquids using star-shaped β-cyclodextrin (β-CD) derivatives. These molecules self-assemble at oil-water interfaces, enabling programmable liquid constructs and soft robots.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Soft Matter Physics

Background:

  • Structuring liquids typically requires particle surface modification or polymer ligands for enhanced interfacial binding.
  • Achieving stable liquid structures at interfaces presents a significant challenge in materials science.

Purpose of the Study:

  • To introduce a simple and robust strategy for liquid structuring using water-soluble β-cyclodextrin derivatives.
  • To investigate the influence of different oil solvents on β-cyclodextrin derivative assembly and liquid structuring behavior.

Main Methods:

  • Utilized star-shaped β-cyclodextrin (β-CD) derivatives as building blocks for interfacial assembly.
  • Examined the assembly and jamming of β-CD derivatives at oil-water interfaces driven by supramolecular interactions.
  • Investigated three classes of solvents: alkanes, aromatic hydrocarbons, and halohydrocarbons.

Main Results:

  • β-CD derivatives exhibit distinct interfacial binding energies and liquid structuring behaviors depending on the solvent class.
  • In aromatic hydrocarbon/water systems, β-CD derivatives form jammed, porous interfacial assemblies with mechanical rigidity and high free volume.
  • Achieved shapeable, reconfigurable liquids with arrested coalescence upon gentle contact.

Conclusions:

  • Supramolecular interactions of β-CD derivatives with oil solvents provide a facile route to liquid structuring.
  • The developed method enables the creation of programmable liquid constructs with tunable properties.
  • Potential applications include advanced soft robotics and reconfigurable materials.