Invited Speaker
Dr. Yushi Liu
Harbin Institute of Technology, ChinaSpeech Title: Graphene oxide enhanced phase change material hydrogels for thermal energy storage
Abstract: The ability of the regulation and control of phase change materials (PCMs) to the environment temperature is directly related with its phase transition behaviors. This work presents a smart PCMs composite by the preparation of graphene oxide-modified hydrate salt/poly(acrylamide-co-acrylic acid) copolymer hydrogel (GO-EHS/PAAAM) form-stable phase change composite, in which the smart thermal properties are achieved by tailoring the phase transition behaviors of the hydrate salt PCM based on the physical and chemical interaction of GO and PAAAM with the hydrate salt. The DSC results show that the single endothermic peak of a pure hydrate salt has been changed into two interconnected peaks of the GO-EHS/PAAAM composite. The corresponding mechanistic analysis was validated by SEM, FT-IR and Raman spectra measurements. Moreover, the thermal conductivity of GO-EHS/PAAAM is increased by 54% with 2 wt% GO incorporated. In addition, the chemical and thermal stability of GO-EHS/PAAAM has been highlighted when subjected to 300 freeze-thaw cycles.