KGM/CNC碳气凝胶定型共晶盐芒硝复合相变材料的制备及热性能研究

摘要/Abstract

摘要： 为解决水合盐相变材料(PCM)的泄漏问题,探究成本更低且绿色环保的碳气凝胶用以定型封装水合盐相变材料,本文以魔芋葡甘聚糖(KGM)和纤维素微晶(CNC)为原料通过定向冷冻铸造和高温碳化成功制备出KGM/CNC碳气凝胶。以添加0.2%(质量分数)纳米碳颗粒的Na₂SO₄·10H₂O-Na₂HPO₄·12H₂O共晶盐(EHS)为相变基质,采用真空浸渍法制备魔芋葡甘聚糖/纤维素微晶复合相变材料(KGM/CNC PCM)。利用SEM、EDS、XRD、Raman、FTIR、XPS和BET对KGM/CNC碳气凝胶结构组成进行分析,采用DSC和TG对KGM/CNC PCM进行热性能研究。结果表明,KGM/CNC碳气凝胶与EHS具有良好的相容性,KGM/CNC PCM可负载98.3%(质量分数)EHS,熔融焓和结晶焓可达273.3和239.1 J·g^-1,经5 000次固液循环后,仅分别下降1.4%和2.8%。本文解决了水合盐相变材料循环稳定性差的问题,有助于进一步推动水合盐相变储能材料的应用。

关键词: 相变材料, 碳气凝胶, 魔芋葡甘聚糖, 纤维素, 共晶盐, 热性能

Abstract: In order to solve the leakage problem of hydrated salt phase change material (PCM) and explore a lower-cost and environmentally friendly carbon aerogel to encapsulate hydrated salt phase change material, KGM/CNC carbon aerogel was successfully prepared by directional freezing-casting and high temperature carbonization using konjac glucomannan (KGM) and cellulose nanocrystal (CNC) as raw materials. Konjac glucomannan/cellulose nanocrystal phase change material (KGM/CNC PCM) was prepared by vacuum impregnation method using Na₂SO₄·10H₂O-Na₂HPO₄·12H₂O eutectic salt (EHS) with 0.2% (mass fraction) nano-carbon particles as phase change matrix. The structure composition of KGM/CNC carbon aerogel was analyzed by SEM, EDS, XRD, Raman, FTIR, XPS and BET. The thermal properties of KGM/CNC PCM were studied by DSC and TG. The results show that KGM/CNC carbon aerogel has good compatibility with EHS. KGM/CNC PCM could load 98.3% (mass fraction) EHS, and the melting enthalpy and crystallization enthalpy could reach 273.3 and 239.1 J·g^-1, respectively. After 5 000 solid-liquid cycles, the melting enthalpy and crystallization enthalpy decrease by 1.4% and 2.8%, respectively. This paper solves the problem of poor cycle stability of hydrated salt phase change material, which is helpful to further promote the application of hydrated salt phase change energy storage material.

Key words: phase change material, carbon aerogel, konjac glucomannan, cellulose nanocrystal, eutectic salt, thermal performance

中图分类号:

TB34

孙增宝, 柳馨, 铁生年. KGM/CNC碳气凝胶定型共晶盐芒硝复合相变材料的制备及热性能研究[J]. 硅酸盐通报, 2024, 43(8): 3071-3078.

SUN Zengbao, LIU Xin, TIE Shengnian. Preparation and Thermal Properties of KGM/CNC Carbon Aerogel Shaped Eutectic Salt Mirabilite Composite Phase Change Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 3071-3078.

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