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Engineering superlyophobic surfaces as the microfluidic platform for droplet manipulation.

Tianzhun Wu¹, Yuji Suzuki

¹State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Xingang West 135, Guangzhou, 510275, PR China. wutzh@mail.sysu.edu.cn

|July 27, 2011

Summary

We developed superlyophobic surfaces (SLS) for advanced droplet manipulation. These surfaces enable precise electric actuation of droplets, significantly reducing adhesion and flow resistance for microfluidic applications.

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Area of Science:

Materials Science
Microfluidics
Surface Engineering

Background:

Microfluidic devices require precise control over liquid droplets.
Existing hydrophobic surfaces often struggle with low adhesion and friction for diverse liquids.

Purpose of the Study:

To engineer robust superlyophobic surfaces (SLS) as a universal platform for droplet manipulation.
To enable electric actuation of droplets on these surfaces with enhanced performance.

Main Methods:

Fabrication and comparison of continuous versus discrete electrode configurations on SLS.
Development of a new formulation for SLS pressure stability across various pattern layouts.
Proposal of a criterion for predicting wetting states (Cassie-Baxter, partial Cassie-Baxter, Wenzel) using dimensionless parameters.

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Main Results:

The discrete electrode configuration demonstrated superior fabrication, microstructure, and nonwetting performance.
SLS reduced oil droplet adhesion by 98% and flow resistance by 73% compared to smooth hydrophobic surfaces.
Experimental data supported the proposed criterion for wetting state prediction.

Conclusions:

Engineered superlyophobic surfaces offer a versatile platform for microfluidic droplet manipulation via electric actuation.
The discrete configuration and proposed wetting criterion enhance the robustness and predictability of SLS.
SLS exhibit excellent hydrodynamic performance across a range of droplet velocities and sizes.