Two types of shape-stabilized phase change materials (PCMs) based on polyethylene glycol (PEG) and graphene oxide (GO) were prepared by two different methods, including a simple blending process and esterification reaction. The interactions between PEG and GO for the blending product (PEG/GO PCMs) is physical and weak, while for the grafting product (PEG-g-GO) is chemical and strong. In the PEG-g-GO composites, almost all PEG segments were restricted due to the strong chemical interactions and therefore no endothermic peak was observed in the DSC curve. As the interactions between PEG and GO in the PEG/GO composites is weak and physical, the phase change enthalpy of the PEG/GO composites is as much as 163 J/g when the PEG content is 90 wt%. The result indicates that the shape-stabilized PCMs with weak physical interactions are more proper for thermal energy storage than that with strong chemical interactions.
Mg, Ni and Cu nanoparticles were prepared by hydrogen plasma-metal reaction method. Nanostructured Mg2Ni and Mg2Ni0.75Cu0.25 compound were successfully obtained using the metal nanoparticles. The synthesis mechanism, the structure and lattice parameter difference, and the hydrogen absorption behaviors of the two compounds were discussed.
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