Biomimetic Rose Petal Structures Obtained Using UV-Nanoimprint Lithography

Area of Science:

• Materials Science
• Surface Engineering
• Biomimetics

Background:

• Natural surfaces, like rose petals, exhibit unique micro/nanostructures that impart special properties.
• Mimicking these natural structures offers a pathway to engineer advanced synthetic materials with tailored functionalities.

Purpose of the Study:

• To create a hydrophobic polymer film by replicating the hierarchical surface structures of rose petals.
• To investigate the effect of rose petal mimetic structures on the wettability of polyurethane acrylate (PUA) films.

Main Methods:

• Utilized a two-step UV-based nanoimprint lithography technique.
• Employed a natural rose petal as the initial template to create a negative replica.
• Transferred the rose petal mimetic structures onto a polyurethane acrylate (PUA) film using the replica as a stamp.

Main Results:

• Successfully fabricated rose petal mimetic micro/nanostructures on PUA films.
• Transformed the inherently hydrophilic PUA film into a highly hydrophobic surface.
• Achieved a significant increase in water contact angle from 65° (neat PUA) to 138° (structured PUA).
• Observed the water pinning effect on the modified PUA surface, similar to natural rose petals.

Conclusions:

• Hierarchical surface structuring is an effective strategy to impart superhydrophobicity to polymer films.
• The biomimetic approach using rose petal structures provides a viable method for developing advanced hydrophobic materials.
• The resulting PUA films exhibit properties suitable for applications requiring water repellency and adhesion control.