On-Chip Control over Polyelectrolyte-Surfactant Complexation in Nonequilibrium Microfluidic Confinement

Area of Science:

• Materials Science
• Chemical Engineering
• Fluid Dynamics

Background:

• Polyelectrolyte-surfactant complexation is crucial for various applications.
• Macroscopic synthesis methods often face limitations in control and efficiency.
• Microfluidic platforms offer potential for precise control over complexation reactions.

Purpose of the Study:

• To classify and quantify factors governing polyelectrolyte-surfactant complexation in microfluidic confinement.
• To optimize microfluidic reactor design and operation for enhanced synthesis.
• To provide advantages over macroscopic synthesis techniques.

Main Methods:

• Analysis and solution of governing convection-diffusion-reaction equations.
• Representation of factors as dimensionless similarity criteria.
• Experimental verification of results in microfluidic chips.

Main Results:

• Identified key factors influencing reaction initiation, product distribution, and phase behavior.
• Demonstrated on-chip control over complexation reaction initiation.
• Achieved production of polyelectrolyte-surfactant aggregates with broader size range and reduced dispersity.

Conclusions:

• Microfluidic confinement provides precise control over polyelectrolyte-surfactant complexation.
• Optimized microfluidic designs and operating modes avoid clogging and improve product characteristics.
• This approach enables superior synthesis of polyelectrolyte-surfactant complexes compared to macroscopic methods.