Artificial eyelashes are controlled by magnet and light. Free Technical Library News

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Artificial eyelashes controlled by magnet and light

07.06.2020

Researchers from North Carolina State University and Elon University (USA) have created artificial cilia, or hair-like structures, that can change shape in response to a magnetic field and then return to their original shape when exposed to an appropriate light source. The development will find application in soft robotics, according to the press service of the University of North Carolina.

Artificial eyelashes are made of thermoplastic polyurethane, in which microparticles of magnetic iron are "sewn up". The most important thing about these structures is that they have shape memory, that is, any shape that the cilia takes can be fixed and then “removed” with the help of light to get a new one.

The cilia are actuated by a magnet, but they are not pulled towards the magnet, but rotate and align with the magnetic field from the permanent magnet. In the researchers' previous work, the magnet also powers soft robots, but it pulls the robot along with it - and thereby powers the robot. The new approach offers another tool for the development of soft robots.

The scientists have also developed a theoretical model that allows users to predict how shape memory magnetic cilia will react when actuated. In addition, the model explains why, in a particular case, the cilia react in this way and not otherwise.

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