Viscoelastic Particle Encapsulation Using a Hyaluronic Acid Solution in a T-Junction Microfluidic Device

Area of Science:

• Biomedical Engineering
• Material Science
• Fluid Dynamics

Background:

• Particle and cell encapsulation in droplets is crucial for biomedical and material science applications.
• Previous research primarily focused on Newtonian liquids, limiting understanding of non-Newtonian systems.
• Microfluidic T-junction devices offer precise control over droplet formation and encapsulation.

Purpose of the Study:

• To investigate particle encapsulation in a non-Newtonian viscoelastic fluid.
• To analyze droplet formation mechanisms in hyaluronic acid solutions.
• To determine conditions for enhanced single particle encapsulation efficiency.

Main Methods:

• Utilized a T-junction microfluidic device.
• Employed a non-Newtonian viscoelastic hyaluronic acid solution in phosphate-buffered saline.
• Studied droplet formation and particle self-assembly dynamics.
• Quantified single encapsulation efficiency under varying experimental conditions.

Main Results:

• Non-Newtonian droplet formation was characterized, with normalized droplet length scaling similarly to Newtonian fluids.
• Particles self-assembled into equally-spaced structures within the viscoelastic fluid.
• Identified experimental conditions yielding single encapsulation efficiencies exceeding the stochastic Poisson limit.

Conclusions:

• Microfluidic encapsulation in non-Newtonian viscoelastic fluids is feasible and controllable.
• Particle self-assembly in viscoelastic fluids can be exploited to enhance encapsulation efficiency.
• This work provides a foundation for advanced particle and cell encapsulation techniques in microfluidics.