Fig. 4
From: Dynamic tuning of optical absorbers for accelerated solar-thermal energy storage
Magnetically accelerated charging of paraffin composites. a Magnetization curves of Fe3O4@graphene nanoparticles (NPs) tested within the temperature range of 300–390 K. The inset images show the effective removal of Fe3O4@graphene NPs from the homogenous dispersion in the melted composite to the side wall under the attraction from the magnet. b Temperature distribution profiles of paraffin composites (0.02 wt%) under thermal charging (TC), optical charging (OC), and magnetically enhanced optical charging (MOC) mode after charging for 270 s. The inset infrared (IR) images show faster charging rates and more uniform temperature distribution under the MOC mode. c Comparison of the stored sensible heat and latent heat under TC, OC, and MOC modes. d Movement of the solid/liquid charging interface as a function of charging time. The top dashed line marks the sample boundary
