Polymer multilayer films regulate macroscopic fluid flow and power microfluidic devices via supramolecular...

Area of Science:

• Supramolecular chemistry
• Microfluidics
• Materials science

Background:

• Powerless microfluidic devices require innovative fluid manipulation methods.
• Modulating non-covalent interactions offers a pathway for controlled fluid flow.
• Supramolecular chemistry provides tools for designing responsive materials.

Purpose of the Study:

• To fabricate and characterize self-powered supramolecular micropumps.
• To demonstrate fluid flow control in microfluidic systems using host-guest interactions.
• To investigate the mechanism driving fluid motion in these devices.

Main Methods:

• Fabrication of thin-film micropumps via layer-by-layer assembly of a β-cyclodextrin functionalized polymer.
• Utilizing host-guest complexation to initiate and control fluid flow.
• Numerical modeling to elucidate the fluid flow mechanism.

Main Results:

• Successful fabrication of thin-film supramolecular micropumps.
• Demonstrated tunable fluid flow upon addition of guest molecules.
• Identified solutal buoyancy, driven by host-guest complexation, as the primary flow mechanism.
• Showcased molecular and colloidal transport in an integrated microfluidic device.

Conclusions:

• Self-powered supramolecular micropumps are feasible using host-guest chemistry.
• These pumps offer a promising solution for fluid manipulation in powerless microfluidic devices.
• The developed technology enables efficient transport of molecules and colloids over long distances.