Fig. 4From: Thermal Storage Properties of Molten Nitrate Salt-Based Nanofluids with Graphene NanoplateletsSEM pictures of molten salt and nanofluids with different particle concentrations: a solar salt, b 0.5 wt%, c 1.0 wt%, d 1.5 wt%, e 2.0 wt%, and f 2.5 wt% at ×5000 magnification. Yellow arrows indicate nanoplatelets, and red circles indicate clustersBack to article page