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  

Preparation and Thermal Properties of KGM/CNC Carbon Aerogel Shaped Eutectic Salt Mirabilite Composite Phase Change Material

作　　者：孙增宝 柳馨 铁生年 SUN Zengbao;LIU Xin;TIE Shengnian(New Energy Photovoltaic Industry Research Institute,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学新能源光伏产业研究中心,西宁810016

出　　处：《硅酸盐通报》2024年第8期3071-3078,共8页Bulletin of the Chinese Ceramic Society

基　　金：青海省自然科学基金项目(2024-ZJ-770);材料复合新技术国家重点实验室(武汉理工大学)开放基金项目(2020-KF-1)。

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Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O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5000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。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 Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O 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 5000 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.

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 

分 类 号：TB34[一般工业技术—材料科学与工程]