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Rapid construct superhydrophobic microcracks on the open-surface platform for droplet manipulations
Wan-Hsuan Lin1, Chien-Wei Chen2,3, Sheng-Hang Wang2
1Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, 1001 Ta-Hseh Rd., Hsinchu, Taiwan.
Scientific Reports
|July 22, 2021
Summary
Researchers developed a fast superhydrophobic surface modification and patterning technique for droplet manipulation in biomedical applications. This method enables efficient droplet transport, mixing, and enhanced sensing sensitivity with reduced reaction times.
Area of Science:
- Surface Science
- Microfluidics
- Biomedical Engineering
Background:
- Droplet manipulation using surface tension is crucial for automated pumping in biomedical applications.
- Existing methods for fabricating superhydrophobic surfaces can be complex and time-consuming.
Purpose of the Study:
- To present a simple, fast superhydrophobic modification and patterning approach for droplet manipulation.
- To demonstrate enhanced performance in droplet transport, mixing, concentration, and sensing using these platforms.
Main Methods:
- Fabrication of superhydrophobic surfaces using commercial reagents (Glaco).
- Patterning of hydrophilic micro-patterns using laser cutters on superhydrophobic surfaces.
- Utilizing back-and-forth vibrations for droplet manipulation on patterned surfaces.
Main Results:
- Successful droplet transport and mixing achieved on predetermined parallel patterns.
- Reduced reaction time (>5x) for horseradish peroxidase (HRP) colorimetry.
- Enhanced sensitivity (>10x) for colorimetric glucose sensing.
- Homogeneous bioassay distribution without the coffee-ring effect.
- Demonstrated control over droplet impacting and rebounding phenomena.
Conclusions:
- The developed approach offers a rapid, low-barrier method for fabricating superhydrophobic films for droplet manipulation.
- This technique enhances efficiency and ease of operation for open microfluidics.
- The findings hold significant potential for broadening future applications in microfluidics and biosensing.
