Porous solids comprising a self-entangled coiled polymer fibre or metal wire reversibly increase their volume when either stretched or compressed in an axial direction, possibly providing a new type of mechanical behaviour for tuning functional properties.
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Baughman, R., Fonseca, A. Straining to expand entanglements. Nature Mater 15, 7–8 (2016). https://doi.org/10.1038/nmat4436
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DOI: https://doi.org/10.1038/nmat4436
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