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This study introduces a microfluidic method to control chiral signals using internal droplet vortex flow. This technique enhances chiral amplification and enantioselective assembly, offering a new way to modulate chiroptical signals.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Chiral materials are crucial for optical applications, but precise control over chiral signals is difficult.
  • Existing methods for regulating chiral signals lack efficiency and precision.

Purpose of the Study:

  • To develop a microfluidic strategy for precise regulation of chiral signals.
  • To investigate the relationship between microvortex dynamics and chiral signal transfer.
  • To enhance chiral amplification and enantioselective supramolecular assembly.

Main Methods:

  • Utilizing a microfluidic system with dual driving forces to regulate vortical flow within droplets.
  • Adjusting flow rate and interfacial tension to induce Marangoni convection and shear flow.
  • Employing Tetrakis(4-sulfonatophenyl)porphyrin and phenethylamine as a supramolecular co-assembly pair.
  • Visualizing flow fields using micro-particle image velocimetry (μ-PIV) and performing hydrodynamic analysis.

Main Results:

  • Microdroplet vortex fields significantly enhance chiral signals and promote enantioselective supramolecular assembly compared to magnetic stirring.
  • Ordered Marangoni convection and shear flow within microdroplets facilitate efficient chiral signal transmission.
  • Hydrodynamic analysis revealed the formation and evolution mechanisms of microvortices under dual driving forces.

Conclusions:

  • The proposed microfluidic strategy effectively modulates supramolecular chiroptical signals through controlled microvortices.
  • Vortical flow in confined environments is a powerful tool for chiral amplification and enantioselective assembly.
  • This approach offers a practical method for designing advanced chiral materials with tailored optical properties.