Michelle Dickinson: nanotechnologist on new research revealing the dark side of eyelash treatments

Ever been caught in the rain and wondered how your vision stays relatively clear? You can thank your eyelashes for that! Recent research published in Science Advances reveals that our lashes do more than just keep out dust - they’re also masters of water management.  The researchers found that eyelashes are equipped with a special microstructure made up of tiny overlapping scales. These scales act like a 'micro-ratchet', allowing water to flow smoothly from the base to the tip while preventing it from reversing direction.  Eyelashes are also naturally hydrophobic, meaning they repel water. When water lands on your lashes, it forms tiny droplets that bead up and roll away. This clever mechanism ensures your eyes stay dry and your vision remains unobstructed.  The magic of eyelashes doesn’t stop at their hydrophobic properties. Their curved shape is called a brachistochrone, a design that minimises the time it takes for water to move under the force of gravity. This natural curve helps lashes efficiently direct water away from your eyes.  Unfortunately, common beauty practices can strip away these natural benefits:  Mascara coated lashes are hydrophilic, meaning they attract water instead of repelling it. This can make them less effective at keeping your eyes dry.  Curling lashes disrupts their natural brachistochrone shape, reducing their ability to efficiently expel water.  Beyond their protective role, the unique structure of eyelashes has inspired engineers to think about new ways to manage liquids. Here are a few ideas sparked by this research:  Advanced Drainage Systems: Eyelash-inspired designs could improve waterproofing for outdoor devices, drones, and wearable electronics.  Self-Cleaning Materials: Mimicking the hydrophobic scales of eyelashes could lead to better anti-fogging glasses and self-cleaning surfaces.  Efficient Liquid Management: Protective coatings for screens and other electronics could benefit from the same principles that keep your lashes dry.  So next time it rains, take a moment to appreciate the remarkable engineering of your lashes - they’re doing more for you than you might think!  LISTEN ABOVESee omnystudio.com/listener for privacy information.