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Honeycomb-like structured biological porous carbon encapsulating PEG: A shape-stable phase change material with enhanced thermal conductivity for thermal energy storage

机译:蜂窝状结构化生物多孔碳封装PEG:一种形状稳定的相变材料,具有增强的导热性,可用于储热

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摘要

Shape-stable and high-thermal conductivity composite phase change materials (c-PCMs) composed of polyethylene glycol (PEG) and biological porous carbon (BPC) are investigated. BPC based on potatoes and white radishes are obtained by the carbonization method. The thermal conductivity of the BPC increases with the rising of the carbonization temperature due to the higher graphitization degree. Especially, BPC calcined at 1300 degrees C for 2 h resulted in the optimum PEG supporting matrix candidate, showing an attractive honeycomb-like microstructure. Calcination above 1300 degrees C results in the destruction of the shape. BPC/PEG c-PCMs are synthesized via a vacuum impregnation approach. PEG equally distributed in the matrix material with a mass fraction of 85.36% approximately and it could keep its morphological stability after heating at 80 degrees C for 40 h. Moreover, the highest thermal conductivity is 4.5 W/m K, which is about 10 times higher than the pristine PEG. Furthermore, no chemical interaction is found between the PEG and BPC. The melting and solidifying temperature, and enthalpy not vary upon a 200 thermal cycles test. This confirms the excellent chemical and structure stability for c-PCMs, which are within the most promising materials in the area of building heat preservation by being clean, energy-saving and recycled materials. (C) 2017 Elsevier B.V. All rights reserved.
机译:研究了由聚乙二醇(PEG)和生物多孔碳(BPC)组成的形状稳定且高导热率的复合相变材料(c-PCM)。通过碳化方法获得了基于马铃薯和白萝卜的BPC。由于更高的石墨化度,BPC的导热率随着碳化温度的升高而增加。特别地,在1300摄氏度下煅烧2 h的BPC产生了最佳的PEG支持基质候选物,显示出有吸引力的蜂窝状微观结构。 1300摄氏度以上的煅烧会导致形状破坏。 BPC / PEG c-PCM是通过真空浸渍方法合成的。 PEG平均分布在基质材料中,质量分数约为85.36%,在80℃加热40 h后可以保持其形态稳定性。此外,最高的热导率是4.5 W / m K,约为原始PEG的10倍。此外,在PEG和BPC之间未发现化学相互作用。熔解和固化温度以及焓在200个热循环测试中均没有变化。这证实了c-PCM具有出色的化学和结构稳定性,它们是清洁,节能和可回收的材料,是建筑保温领域最有希望的材料。 (C)2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Energy and Buildings》 |2018年第2期|1049-1062|共14页
  • 作者单位

    China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, PR, Peoples R China;

    China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, PR, Peoples R China;

    China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, PR, Peoples R China;

    China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, PR, Peoples R China;

    China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, PR, Peoples R China;

    China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, PR, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Honeycomb-like structure; Biological porous carbon; PEG; Shape stabilization; Thermal conductivity reinforcement;

    机译:蜂窝状结构;生物多孔碳;PEG;形状稳定;导热系数;
  • 入库时间 2022-08-18 00:08:37

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