PCNs leverage the high surface area and unique properties of nanomaterials to improve the performance of traditional PCMs. When a PCM transitions between phases, it absorbs or releases heat, which can be harnessed for thermal energy storage or temperature regulation. The inclusion of nanomaterials such as carbon nanotubes, graphene, or metallic nanoparticles enhances the thermal conductivity and stability, ensuring efficient heat transfer and prolonged material life.