Superhydrophobic hierarchically structured surfaces in biology: evolution, structural principles and biomimetic...

Area of Science:

• Biomimetics
• Surface Science
• Evolutionary Biology

Background:

• Superhydrophobic surfaces, characterized by water repellency, are prevalent in nature.
• These surfaces exhibit properties like self-cleaning (lotus effect) and drag reduction (Salvinia effect).
• Biomimetic applications are inspired by these natural phenomena.

Purpose of the Study:

• To survey the construction principles and occurrences of superhydrophobic surfaces in organisms.
• To describe their properties and discuss biomimetic applications.
• To investigate the evolutionary origins of superhydrophobicity.

Main Methods:

• Scanning electron microscopy of nearly 20,000 species.
• Literature review of existing research on superhydrophobic surfaces.
• Phylogenetic analysis to infer evolutionary history.

Main Results:

• Superhydrophobicity evolved approximately 450 million years ago, coinciding with the colonization of land.
• Diverse natural materials and structures, often self-assembled, create superhydrophobicity.
• Biomimetic applications include established self-cleaning technologies and emerging drag reduction solutions.

Conclusions:

• Superhydrophobicity is a key evolutionary innovation for terrestrial life.
• Nature provides a diverse blueprint for superhydrophobic surfaces with significant technological potential.
• Further research into biomimetic applications is warranted.