Fig. 4: Charging of paraffin-graphene composite.
From: Accelerating the solar-thermal energy storage via inner-light supplying with optical waveguide
a Schematic of experimental setup for charging of paraffin-graphene composite. A blue laser with the wavelength of 450 nm is used to illuminate onto the incident face of the POF in inner-light-supply mode and directly illuminate the surface of paraffin-graphene composite in surface irradiation mode. b Temperature evolution of paraffin-graphene composite in surface irradiation mode (top) and inner-light-supply mode (bottom) by prolonging the charging time from 0 min to 75 min. c, d Temperature distribution profiles at different charging times in surface irradiation mode (c) and inner-light-supply mode (d). The cyan line denotes the phase change temperature of the composite (42 °C). e Photographs of unmelted paraffin-graphene composite in surface irradiation mode (right) and inner-light-supply mode (left) after charging for 75 min. In order to get a better view, we put the sample upside down. f IR thermal image of the paraffin-graphene composite in inner-light-supply mode during four phase transition cycles. During each cycle, we displayed the charging and discharging process.
