Core@double-shell structured multifunctional phase change microcapsules based on modified graphene oxide Pickering emulsion

New multifunctional phase change microcapsules with paraffin (Pn) as core and GO and lead tungstate (PbWO₄) as double‐shell were designed by modified GO Pickering emulsion, and the effect of GO content on Pn@GO@PbWO₄ microcapsules was studied. The morphology, chemical composition, and structure of Pn@GO@PbWO₄ microcapsules were characterized, and their performance was studied in depth. The Pn@GO@PbWO₄ microcapsules had a dense shell and a regular spherical structure. Compared with microcapsules without GO addition, the resultant Pn@GO@PbWO₄ microcapsules could demonstrate high phase change reliability and thermal stability. Most of all, the anti‐seepage performance had been greatly improved by 67.27%. The results of contact angle (CA) measurement and gamma‐ray shielding test showed that the GO and PbWO₄ double‐shell multifunctional microcapsules with superhydrophobic property and good gamma‐ray shielding property and high anti‐seepage performance had great attraction in expanding the application field of phase change materials.