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Related Experiment Video

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High Throughput Single-cell and Multiple-cell Micro-encapsulation

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Effect of surface wettability on microfluidic EDGE emulsification.

Abid Aslam Maan¹, Sami Sahin, Liyakat Hamid Mujawar

¹Wageningen University, Food Process Engineering Group, Wageningen, The Netherlands. abid.maan@yahoo.com

Journal of Colloid and Interface Science

|May 21, 2013

Summary

Wettability significantly impacts microfluidic emulsification. Optimal droplet size and uniformity were achieved at high contact angles, but stability improved at slightly lower angles, revealing a trade-off for controlled emulsion generation.

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Area of Science:

Microfluidics
Colloid and Surface Science
Emulsion Technology

Background:

Microfluidic emulsification offers precise control over droplet generation.
Wettability is a critical parameter influencing interfacial phenomena in microfluidic devices.
Understanding wettability effects is crucial for optimizing emulsion characteristics.

Purpose of the Study:

To investigate the influence of dispersed phase contact angles on microfluidic EDGE emulsification.
To determine the relationship between wettability and emulsion properties like droplet size, uniformity, and stability.
To identify optimal wettability conditions for producing monodispersed emulsions with enhanced stability.

Main Methods:

Microfluidic EDGE emulsification experiments were conducted.
Contact angles were varied between 90° and 160°.
Droplet size, coefficient of variation, pressure stability, and droplet generation frequency were analyzed.

Main Results:

The highest contact angle (160°) yielded monodispersed emulsions (5.0 μm, CV <10%) but with low pressure stability.
Enhanced pressure stability and increased droplet generation frequencies (up to 2.0x for Tween20, 3.5x for Tween60) were observed at contact angles <150°.
High polydispersity occurred at contact angles <100° due to wetting by the dispersed phase.

Conclusions:

Wettability plays a crucial role in microfluidic emulsification, affecting both droplet characteristics and process stability.
A contact angle below 150° is necessary for achieving stable and efficient microfluidic emulsification.
Careful control of wettability is essential for tailoring emulsion properties in microfluidic systems.