This scanning electron micrograph shows the intricate, ordered, and hierarchical structures on fly wings. Although grey and inconspicuous, the fly species Sarcophaga bullata has amazing micron and sub-micron structures on their wings. The surfaces of the wings are covered with nanoscale protrusions (around 220 nm of diameter), interspaced with micron level (around 30µm of height) hairs. These hairs all have hooks at the tip, curving and folding back on themselves. These hairs contribute to the fly’s ability to shed and repel water. When flies get wet in the rain, these hairs can hold up micro-sized droplets and prevent the wing surfaces from getting wet. Our understanding of the fly’s biology provides inspiration for the next-generation waterproofing surfaces. Our lab group has successfully replicated micro- hairs on polymer surfaces, enabling the polymer to repel water. Our fly-inspired design has the potential to be incorporated into future water-proofing fabrics and technologies.
