fig5

Figure 5. Phase change material for thermal protection. (A) Heat flow direction of wearable device with the thermal protective substrate (TPS); (B) heat-absorbing microspheres composed of PCM. Reproduced with permission^[129]. Copyright 2022, Springer Nature; (C) a wearable device composed of a soft heater and a thermal protective substrate; (D) heat shielding test at pig skin attribute TPS. Reproduced with permission^[130]. Copyright 2019, Wiley-VCH GmbH; (E) advanced thermal skin (ATS) imparted with silver flake/PDMS serpentine structure (SPS) and sodium-acetate-based hydrogel matrix (SAHM); (F) on-demand solid-to-liquid phase shift of SAHM. Reproduced with permission^[131]. Copyright 2022, Elsevier; (G) fabrication process of Paraffin@Cu microcapsules; (H) optical and SEM images of Paraffin@Cu/silicone elastomer composite. Reproduced with permission^[132]. Copyright 2021, Springer Nature.