Fig. 4: Mechanical performance of magnetically tightened form-stable phase change materials (MTPCMs).

a Compression stress-strain curves of pure paraffin and MTPCMs at the temperature below the melting point. b Compression stress-strain curves of MTPCMs at the temperature above the melting point. The insets are the typical compressed samples. Scale bars: 2 mm. c Anisotropic compression stress-strain curves of MTPCM at different directions.