3D Printing of Superhydrophobic Objects with Bulk Nanostructure

Area of Science:

• Materials Science
• Additive Manufacturing
• Surface Chemistry

Background:

• Superhydrophobic materials offer unique properties like self-cleaning and anti-biofouling.
• Existing methods for creating superhydrophobic surfaces are often limited to coatings, posing challenges for complex 3D objects and mechanical stability.

Purpose of the Study:

• To present a novel materials concept and methodology for 3D printing of superhydrophobic macroscopic objects.
• To overcome limitations of traditional surface functionalization methods for 3D applications.

Main Methods:

• Development of a specialized ink containing hydrophobic monomers and porogen solvents.
• Utilizing Digital Light Processing (DLP) 3D printing to photopolymerize the ink, inducing phase separation and creating bulk nanostructures.
• Characterization of water adhesion using scanning droplet adhesion microscopy.

Main Results:

• Successful 3D printing of complex superhydrophobic objects with inherent nanoporosity throughout the volume.
• Demonstration of ultralow and uniform water adhesion on the printed objects.
• Preservation of superhydrophobicity even after wear damage due to the bulk nanostructure.

Conclusions:

• The presented method enables the fabrication of robust, superhydrophobic 3D objects with complex geometries.
• The inherent nanoporous structure provides superior durability compared to traditional coatings.
• Potential applications include gas-permeable microfluidic devices and oil-absorbent materials.