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Early detection of material damage can be achieved using a carbon nanotube concentrated interphase between a single glass fiber and polymer resin. Edith Mäder, Shanglin Gao, and co‐workers report on page 3392 that by bridging across a micro‐crack with the nanotube networks, an exceptional electromechanical switch is fabricated. The switch exhibits “on” and “off” states actuated by strain, temperature,...
A single multiwalled carbon nanotube (MWNT)‐glass fiber is used to monitor the initiation and growth of microcracks in composites, which provides an early warning system to detect fracture in materials. An electromechanical microswitch is further constructed based on the connecting/breaking of the nanotube bridges across microcracks under external strain or thermal expansion.
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