Enhanced thermal conductivity in a hydrated salt PCM system with reduced graphene oxide aqueous dispersion.
Enhanced thermal conductivity in a hydrated salt PCM system with reduced graphene oxide aqueous dispersion.
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在水合盐PCM系统中增强了热导率，并减少了氧化石墨烯水性分散体。
DOI：
10.1039/c7ra10632g
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发表时间：
2018-01-02
期刊：
影响因子：
3.9
通讯作者：
Zeng, Jinbo
中科院分区：
文献类型：
--
作者：
Zhang, Xinxing;Li, Xiang;Zhou, Yuan;Hai, Chunxi;Shen, Yue;Ren, Xiufeng;Zeng, Jinbo
研究了含有相变材料（PCM）r-GO/CaCl2·6H2O的新型还原氧化石墨烯（r-GO）的相变焓、热导率、热稳定性和热可靠性。该材料由r-GO与二水氯化钙(CaCl2·2H2O)按CaCl2·6H2O中CaCl2和结晶水的质量比水分散而成。当使用~0.018%（按重量计）的r-GO时，相变材料的热导率增加了~80%，而热函（即存储容量）降低了~2.7%，而使用~0.018%的石墨导致热导率增加了~14%，热函减少了~5.6%。此外，用于分散r-GO的表面活性剂还具有增强体系稳定性和可靠性的额外功能。 r-GO/CaCl2·6H2O的分解温度高于CaCl2·6H2O。经过100次循环后，r-GO/CaCl2·6H2O的熔融和结晶焓从180.6 J g−1和153.7 J g−1下降到178.4 J g−1和150.7 J g−1，分别下降了1.2%和2.0%，而CaCl2·6H2O分别下降到178.9 J g−1和178.9 J g−1和150.7 J g−1。 147.8 J g−1 从 185.6 J g−1 和 161.8 J g−1 分别下降了 3.7% 和 8.7%。 r-GO对CaCl2·6H2O的导热性能明显优于以往文献报道的石墨和其他导热添加剂，并且所提供的方法（即首先制备添加剂的水分散体，然后与相应的盐合成水合盐PCM）也适用于其他不能直接分散的功能添加剂来改变水合盐PCM体系的热性能。我们通过r-GO水分散体制备了r-GO/CaCl2·6H2O，以提高水合盐PCM的导热率。
The phase change enthalpy, thermal conductivity, thermal stability and thermal reliability of a novel reduced graphene oxide (r-GO) containing phase change material (PCM) r-GO/CaCl2·6H2O were investigated. The material was made by the aqueous dispersion of r-GO and calcium chloride dihydrate (CaCl2·2H2O) according to the mass ratio of CaCl2 and crystal water in CaCl2·6H2O. The thermal conductivity of the phase change material increased by ∼80% when using ∼0.018% (by weight) of r-GO with a ∼2.7% decrease of enthalpy (i.e., storage capacity), while using ∼0.018% of graphite led to an increase of thermal conductivity by ∼14% and a decrease of enthalpy by ∼5.6%. Additionally, the surface active agent for dispersing r-GO had the extra function of enhancing the system stability and reliability. The decomposing temperatures of r-GO/CaCl2·6H2O were higher than those of CaCl2·6H2O. After 100 cycles, the melting and crystallizing enthalpies of r-GO/CaCl2·6H2O decreased to 178.4 J g−1 and 150.7 J g−1 from 180.6 J g−1 and 153.7 J g−1, dropping by 1.2% and 2.0%, respectively, while for CaCl2·6H2O they decreased to 178.9 J g−1 and 147.8 J g−1 from 185.6 J g−1 and 161.8 J g−1, dropping by 3.7% and 8.7%, respectively. The thermal conductivity enhancement of CaCl2·6H2O with r-GO was markedly superior compared to that with graphite and other thermal conductive additives reported in previous literature, and the provided method (i.e., preparing aqueous dispersions of additives firstly and synthesizing hydrated salt PCMs with corresponding salts subsequently) was also applicable for other functional additives that cannot be directly dispersed well to modify the thermal properties of hydrated salt PCM systems. We prepared r-GO/CaCl2·6H2O by r-GO aqueous dispersion to enhance the thermal conductivity of a hydrated salt PCM.
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