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Graphene nanoplatelets (GnP) and expanded graphite(EG) were used as the carbon material addition to enhance the thermal performance of palmitic-stearic acid(PA-SA).The GnPs and EG were dispersed into PA-SA with four mass fraction of lwt%, 2wt%, 4wt% and 8wt%, and Poly Vinyl Pyrrolidone (PVP) was used as the dispersion stabilizer.