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Exploring a direct injection method for microfluidic generation of polymer microgels.

Yihe Wang¹, Ethan Tumarkin, Diego Velasco

¹Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

|February 15, 2013

Summary

The direct injection method enables microgel preparation from highly viscous polymer solutions using microfluidics. This technique overcomes previous limitations, expanding polymer choices for microfluidic microgel synthesis.

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Area of Science:

Polymer Chemistry
Materials Science
Microfluidics

Background:

Microfluidics (MFs) allows precise control over microgel properties.
Generating microgels from highly viscous solutions using MFs is challenging.
Spatial separation of emulsification and gelation can overcome viscosity limitations.

Purpose of the Study:

To explore the direct injection method for microgel preparation from viscous liquids.
To adapt microfluidic techniques for a wider range of polymers.
To demonstrate a novel approach for overcoming viscosity challenges in microgel synthesis.

Main Methods:

Utilized a "direct injection" approach within microfluidic devices.
Injected concentrated polymer solutions or gelling agents into precursor droplets.

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Developed two systems: one with agarose, another with methyl-β-cyclodextrin and hydrophobized poly(ethylene glycol).

Main Results:

Successfully prepared microgels from highly viscous polymer solutions.
Demonstrated the feasibility of the direct injection method for both agarose and complex polymer systems.
Showcased the release of hydrophobized poly(ethylene glycol) to form microgels via surfactant interaction.

Conclusions:

The direct injection method is effective for microgel preparation from viscous liquids.
This method expands the scope of polymers usable in microfluidic microgel synthesis.
Optimized direct injection offers a versatile approach for advanced microgel fabrication.