Superamphiphobic surface by nanotransfer molding and isotropic etching

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Developing surfaces that repel both water (superhydrophobic) and oil (superoleophobic) is crucial for advanced applications.
• Existing methods often struggle with creating ordered nanostructures and preventing particle aggregation.

Purpose of the Study:

• To present a novel fabrication method for creating superhydrophobic and superoleophobic surfaces.
• To achieve nanoscale reentrant curvature with ordered nanostructures and prevent capillary-induced bundling.
• To demonstrate the effectiveness of these surfaces for self-cleaning applications.

Main Methods:

• Utilizing nanotransfer molding for precise pattern transfer.
• Employing controlled wet etching to create facile undercut and reentrant curvature.
• Characterizing nanostructure morphology and surface properties via water droplet bouncing and contact angle measurements.

Main Results:

• Successfully fabricated completely ordered reentrant nanostructures with mushroom-like, overhanging features.
• Demonstrated superhydrophobic and superoleophobic properties through contact angle and droplet bouncing tests.
• Achieved high transparency of the fabricated surfaces on a flexible substrate.

Conclusions:

• The novel fabrication method enables the creation of highly ordered, reentrant nanostructures.
• The resulting surfaces exhibit excellent superhydrophobic and superoleophobic characteristics.
• These surfaces hold significant promise for future self-cleaning applications.