Paper can be turned into an actuator by applying a thin layer of conducting thermoplastic by 3D printing, or even by hand, according to Carnegie Mellon University. When current is fed through the thermoplastic – off-the-shelf graphene polyactide composite – it heats and expands causing the paper to bend or fold – an process which ...
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from Electronics Weekly https://www.electronicsweekly.com/news/design/actuator-formed-2d-printing-paper-2018-08/
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