Reversible fusion and fission of graphene oxide–based fibers

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Science  07 May 2021:
Vol. 372, Issue 6542, pp. 614-617
DOI: 10.1126/science.abb6640

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Reversible fiber fusion and fission

Materials that can cycle between states are of interest for actuators, soft robotics, or recoverable membranes for separations. Chang et al. show that a collection of graphene oxide fibers can fuse into a single stronger fiber upon immersion in a solvent, extraction, and drying under tension (see the Perspective by Cruz-Silva and Elías). The geometrical deformation of the fibers during drying and swelling plays an important role in the reversible cycles, with a large volume change between the dried and swelled fibers. Moreover, fibers made from polymers, glass, metal, or silk can be given these abilities when coated with a micron-sized layer of graphene oxide.

Science, this issue p. 614; see also p. 573

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