关键词:
graphene oxide
cellulose nanocrystal
Pickering emulsion
phase change material microcapsule
photothermal
摘要:
Phase change materials(PCMs)have attracted significant attention in thermal management due to their ability to store and release large amounts of heat during phase ***,their widespread application is restricted by leakage *** PCMs within polymeric microcapsules is a promising strategy to prevent leakage and increase heat transfer area with ***,photothermal PCM microcapsules are particularly desirable for solar energy ***,we fabricated photothermal PCM microcapsules with melamine-formaldehyde resin(MF)as shell using cellulose nanocrystal(CNC)and graphene oxide(GO)co-stabilized Pickering emulsion droplets as *** displays outstanding Pickering emulsifying ability and can facilitate the fixation of GO at the oil-water interface,resulting in a stable CNC/GO co-stabilized PCM Pickering emulsion.A polydopamine(PDA)layer was coated in-situ on the emulsion droplets via oxidization self-polymerization of ***,GO was reduced to reduced GO(rGO)due to the reducing ability of *** outmost MF shell of the PCM microcapsules was formed in-situ through the polymerization and crosslinking of MF *** resulted PCM@CNC/rGO/PDA/MF microcapsules exhibit uniform sizes in the micrometer range,excellent leakage-proof performance,high phase change enthalpy(175.4 J g^(−1))and PCM encapsulation content(84.2%).Moreover,the presence of rGO and PDA endows PCM@CNC/rGO/PDA/MF microcapsules with outstanding photothermal conversion *** temperature of PCM@CNC/rGO/PDA/MF microcapsule slurries(15wt.%)can reach 73°C after light irradiation at 1 W cm^(−2).Therefore,photothermal PCM@CNC/rGO/PDA/MF microcapsules are promising for solar energy harvesting,thermal energy storage,and release in various applications,such as energy-efficient buildings and smart textiles.