Smooth, All-Solid, Low-Hysteresis, Omniphobic Surfaces with Enhanced Mechanical Durability

Area of Science:

• Materials Science
• Surface Chemistry

Background:

• Omniphobic surfaces repel diverse liquids, offering benefits like self-cleaning and anti-fouling.
• Current methods using texture or lubricants often lack long-term stability and durability.

Purpose of the Study:

• To develop a robust, smooth omniphobic coating independent of substrate.
• To overcome the limitations of existing omniphobic surface fabrication methods.

Main Methods:

• Fabrication of an all-solid, smooth omniphobic coating using fluorinated polyurethane and fluorodecyl polyhedral oligomeric silsesquioxane.
• Testing liquid droplet behavior (water, hexadecane, ethanol, silicone oil) on the coating.
• Assessing surface durability through mechanical abrasion tests.

Main Results:

• The novel coating demonstrated low-contact-angle hysteresis (<15°) for various liquids, enabling residue-free droplet sliding.
• The all-solid, smooth surface exhibited superior retention of repellent properties compared to textured or lubricated surfaces after abrasion.
• The coating proved substrate-independent.

Conclusions:

• A new class of smooth, all-solid omniphobic coatings has been successfully fabricated.
• These coatings offer enhanced durability and stability, overcoming key limitations of current technologies.
• The developed material holds promise for applications requiring robust liquid repellency.