Superhydrophobic microstructures for better anti-icing performances: open-cell or closed-cell?

Area of Science:

• Materials Science
• Surface Engineering
• Tribology

Background:

• Superhydrophobic surfaces offer excellent water repellency at room temperature.
• The anti-icing performance of closed-cell superhydrophobic structures in cold environments remains unconfirmed.
• Designing optimal superhydrophobic anti-icing microstructures for low temperatures is challenging.

Purpose of the Study:

• To investigate the anti-icing performance of superhydrophobic surfaces with varying cell structures (closed-cell to open-cell).
• To understand the mechanisms behind ice adhesion and de-icing recovery on different microstructures.
• To establish a design principle for durable superhydrophobic anti-icing surfaces.

Main Methods:

• Fabrication of superhydrophobic surfaces with tunable micro-nanostructures using ultrafast laser.
• Icing and melting cycle tests to evaluate anti-icing performance and ice adhesion.
• Development of an improved ideal gas model to explain icing/de-icing mechanisms.

Main Results:

• Closed-cell structures degrade to a high-adhesion state after icing/melting cycles.
• Open-cell structures recover to their original superhydrophobic state.
• Optimized open-cell surfaces show significantly lower ice adhesion (1.4 kPa) and high durability (<20 kPa after 33 cycles).

Conclusions:

• Open-cell superhydrophobic structures are superior for anti-icing applications in cold environments.
• Increased air pocket pressure in open-cell structures enhances low-temperature icephobicity.
• The study provides a general design principle for optimizing superhydrophobic anti-icing surfaces for harsh conditions.