Bio-Inspired Super-Surfaces from Frost-Assisted Freeze-Casting Strategy

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Fabricating bio-inspired super-surfaces with tailored wettability and optical properties is challenging.
• Existing methods often lack simplicity and directness in achieving desired surface structures.

Purpose of the Study:

• To present a novel frost-assisted freeze-casting strategy (FFCS) for fabricating micro-nanostructured super-surfaces.
• To demonstrate a generalizable approach applicable to various materials by leveraging thermodynamic frosting processes.

Main Methods:

• Utilizing the upward movement of polymer monomers along frost crystal structures during thermodynamic frosting.
• In situ photocrosslinking of monomers followed by removal of frost crystals to create hierarchical structures.
• Integrating nanomaterials to enhance surface functionalities.

Main Results:

• Successfully fabricated super-surfaces with frost-crystal-like hierarchical structures using FFCS.
• Demonstrated the general applicability of FFCS across a wide range of materials.
• Achieved superhydrophobicity, high photothermal conversion efficiency, anti-icing properties, light-healing, and self-cleaning capabilities in the treated surfaces.

Conclusions:

• The FFCS offers a simple, direct, and generalizable method for creating advanced super-surfaces.
• Harnessing thermodynamic frosting processes provides a novel pathway for material fabrication.
• The developed super-surfaces exhibit multifunctional properties with broad application potential.