Bioinspired monolithic polymer microsphere arrays as generically anti-adhesive surfaces

Area of Science:

• Surface Science and Engineering
• Biomaterials and Bioinspired Materials

Background:

• Bioinspired surfaces with anti-adhesive properties are gaining attention for minimizing contact area with various surfaces.
• Existing methods for creating these surfaces are often complex or not scalable.

Purpose of the Study:

• To develop a scalable method for producing bioinspired surfaces with generic anti-adhesive and anti-fouling properties.
• To investigate the adhesion behavior of these surfaces with soft and compliant materials.

Main Methods:

• Large-scale fabrication of mechanically stable, monolithic arrays of microspheres via double replication of microsphere monolayers.
• Characterization of adhesion forces using sticky and compliant counterpart surfaces.
• Hierarchical structuring by generating nanorod arrays on microsphere arrays.
• Modeling of anti-adhesive behavior using a modified Johnson-Kendall-Roberts approach.

Main Results:

• Microsphere arrays demonstrated adhesion one order of magnitude weaker compared to flat control surfaces.
• The addition of a second hierarchical level (nanorod arrays) did not significantly alter adhesion forces.
• The developed surfaces exhibited both anti-adhesive and anti-fouling characteristics.

Conclusions:

• A simple, scalable double replication method can produce effective bioinspired anti-adhesive and anti-fouling surfaces.
• These surfaces show significant adhesion reduction, particularly with soft and compliant materials.
• The study provides design criteria for topographic adhesion minimization through theoretical modeling.