OYO BUTURI Vol.86 No.12 (2017)

Point-defect/Cell rheology/Macrocyclic aromatic molecules/Supramolecular polymers/Self-healing metal wire/CT excitons

Cover of OYO BUTURI Vol.86 No.12 (2017)
Cover photo of OYO BUTURI Vol.86 No.12 (2017)

An electric wire that self-repairs cracks solely by applying a voltage and without any knowledge of the location or size of the generated cracks has been realized. When a voltage is applied to a wire with a structure that is a metal wire with a crack covered by a metal nanoparticle dispersion, a dielectrophoretic force is generated on the particles adjacent to the crack, due to the electric field generated only on the crack. This force then traps the particles in the crack, and consequently, the wire is electrically repaired. The figure shows a telescopic device using a self-repairing wire and surface-mounted LED chip. When it was extended by approximately 30 %, the wire was discon- nected and the LED turned off, nonetheless, when it was retained as is, the wire was repaired in approximately 3 seconds, and the LED was turned on again. (p.1061)