High-Throughput Stamping of Hybrid Functional Surfaces

Area of Science:

• Materials Science
• Surface Science
• Nanotechnology

Background:

• Hybrid surfaces (biphilic) show promise for heat transfer, anti-icing, and fog harvesting.
• Existing fabrication methods for these surfaces lack scalability and are costly.

Purpose of the Study:

• To develop a simple, scalable, and rapid stamping technique for creating hybrid surfaces with controlled wettability.
• To demonstrate the versatility of the technique across different substrates and hydrophobic chemistries.

Main Methods:

• Utilized prefabricated polydimethylsiloxane (PDMS) stamps for a reusable, substrate-independent process.
• Applied the stamping technique to silicon wafer, copper, and aluminum substrates functionalized with various hydrophobic coatings.
• Characterized the resulting surfaces using microgoniometry and condensation experiments.

Main Results:

• Successfully created hybrid surfaces with spatially controlled wettability, featuring hydrophobic backgrounds and hydrophilic spots.
• Demonstrated stable coalescence-induced droplet jumping on surfaces with superhydrophobic backgrounds and hydrophilic spots.
• Achieved comparable prototyping costs to conventional methods but with reduced manufacturing time and expense.

Conclusions:

• The developed stamping technique offers a scalable and cost-effective method for manufacturing next-generation hybrid wettability surfaces.
• Presents design guidelines for creating scalable hybrid surfaces for studying phase change phenomena.
• Enables efficient prototyping and potential for widespread application in areas like enhanced heat transfer and anti-icing.