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Mechanical properties of graphene sponges (GS) and graphene foams (GF). Compression-recovery process of GS (a–c) and GF (e–g) after 50% deformation, and the compressive stress-strain curves of 6 cycles of loading and unloading for GS (d) and GF (h) under constant pressure. Adapted from [3], with permission from © 2014 The Royal Society of Chemistry.
