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(a–d) Optical phase contrast microscopy images of the PCM loaded with 0.005 wt % oleic acid-functionalized GNPs, in the liquid state, after first, second, third, and fourth thermal cycles, respectively. (e–h) Optical phase contrast microscopy images of the PCM loaded with 0.005 wt % uncoated GNPs (GNPs-UC), in the liquid state, after first, second, third, and fourth thermal cycles, respectively. A few aggregates are encircled in the figures for easy identification.
