Modified Phase Change Microcapsules with Calcium Carbonate and Graphene Oxide Shells for Enhanced Energy Storage and Leakage Prevention

Abstract

Environmentally friendly microencapsulated phase change materials (MEPCMs) with calcium carbonate (CaCO3) shells were modified with graphene oxide (GO), and the effects of GO content and methodology on MEPCMs were examined. The core–shell structure of MEPCMs and crystal structure of CaCO3 shells were confirmed by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffractometer (XRD). The thermal properties and stability of MEPCMs were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), suggesting that the addition of GO contributed to improving the heat storage capacity and thermal stability of MEPCMs. When the GO content was 1.0 wt %, the encapsulation ratio of MEPCMs was as high as 73.19%, and the leakage rate was reduced by 89.6% compared to the MEPCMs without GO. Furthermore, the thermal conductivity and mechanical properties of GO modified MEPCMs were improved significantly. The considerable latent heat storage, thermal stability, thermal conductivity, leakageprevention, and mechanical properties of GO modified paraffin@CaCO3 MEPCMs offer potential in green energy applications.

Multifunctional phase change microcapsules based on graphene oxide Pickering emulsion for photothermal energy conversion and superhydrophobicity

“…In order to assess the leakage prevention of phase change microcapsules, one of the effective strategies is to calculate the leakage rate (Lr) . The microPCMs were placed on the paper in oven, and the experiment of temperature was 80°C.…”

“…In order to assess the leakage prevention of phase change microcapsules, one of the effective strategies is to calculate the leakage rate (Lr). 39 The microPCMs were placed on the paper in oven, and the experiment of temperature was 80 C. After each 1 hour, all the samples were together taken out from oven and weighed mass and then again put in the oven. The initial mass and the later mass are Mi and Ml, respectively.…”

Novel cement slurry containing micro‐encapsulated phase change materials: Characterization, application and mechanism analysis

“…The GO have large surface area, good dispersion and compatibility with UF shell, besides, the GO can share part of the external force, transfer and consume part of the external energy. Thus, the mechanical strength of Micro‐P1 was enhanced by GO …”

“…Then, when the adding amount of GO is 0.30 wt %, it was found that the Micro‐P1 has the best thermal conductivity. GO exists uniformly and stably in UF, and strong inter‐facial force exists between GO and UF matrix, therefore, the thermal stability was improved by adding GO …”

“…GO exists uniformly and stably in UF, and strong inter-facial force exists between GO and UF matrix, therefore, the thermal stability was improved by adding GO. 26…”