Curious Cases Nano Sharks
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Jun 6, 2025 In this episode, Professor Manish Tiwari, a nanoengineering expert from University College London, and Dr. Jess Wade, a functional materials lecturer at Imperial College London, dive into the fascinating world of shark skin. They explore how the unique texture of dermal denticles could revolutionize vehicle and aircraft designs, enhancing speed and efficiency. The conversation also touches on the broader implications of nature-inspired nanoengineering, discussing superhydrophobic materials and the potential for innovative, eco-friendly technologies.
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Shark Dermal Denticles Reduce Drag
- Shark skin is covered in tiny, teeth-like structures called dermal denticles that vary in size and orientation.
- These denticles reduce drag by trapping vortices, helping sharks swim up to 12% faster.
Shark Skin Mimics Golf Ball Dimples
- Shark skin denticles work like golf ball dimples by delaying boundary layer separation.
- This traps vortices which reduce frictional drag, improving movement through water or air.
Nature's Nanostructure Examples
- Lotus leaves have hierarchical micro- and nanostructures making them highly hydrophobic and self-cleaning.
- Insect legs like those of water boatmen use nanostructures to repel water and help them move on water surfaces.