Enhanced thermal conductivity of composite phase change materials based on carbon modified expanded perlite
| Autor: | Xin Min, Xiaowen Wu, Boyang Xia, Zhensheng Dong, Song Xue, Yajing Zhao, Yangai Liu, Minghao Fang, Xiaotong Huo, Xiaoguang Zhang, Runjie Li, Zhaohui Huang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Carbonization Composite number chemistry.chemical_element 02 engineering and technology Polyethylene glycol 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Adsorption Thermal conductivity chemistry Chemical engineering PEG ratio Perlite General Materials Science 0210 nano-technology Carbon |
| Zdroj: | Materials Chemistry and Physics. 261:124226 |
| ISSN: | 0254-0584 |
| Popis: | Phase change materials (PCMs) have attracted growing attention in clean energy storage fields. To improve the thermal conductivity of porous mineral-based composite PCMs (c-PCMs), pretreatment via in-situ carbonization is proposed to fill the pore structure with thermally conductive carbon. After vacuum impregnation, high-performance c-PCMs are obtained, comprising carbon-modified expanded perlite (EPC) and polyethylene glycol (PEG). The modified micro-pores optimize the heat transfer characteristic behaviors in c-PCMs and improve the adsorption stability of PEG. Thus, the load capacity of PEG reaches approximately 73.90 wt% in EPC/PEG c-PCMs, providing excellent chemical and structural stability among perlite matrix, carbon modifier and PEG PCMs. The thermal conductivity of the EPC/PEG c-PCMs is 0.521 W/(m·K), which is almost 1.3 times that of the pristine PEG. These performances indicate that the EPC/PEG c-PCMs could be used as an environmentally friendly material for external wall heat-insulation application. |
| Databáze: | OpenAIRE |
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