Tetradecanol/expanded graphite composite form-stable phase change material for thermal energy storage.
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| Title: | Tetradecanol/expanded graphite composite form-stable phase change material for thermal energy storage. |
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| Authors: | Zeng, Ju-Lan1 julan_zeng@163.com, Gan, Juan1, Zhu, Fu-Rong1, Yu, Sai-Bo2, Xiao, Zhong-Liang1, Yan, Wen-Pei1, Zhu, Ling1, Liu, Zhen-Qiang1, Sun, Li-Xian1, Cao, Zhong1 |
| Source: | Solar Energy Materials & Solar Cells. Aug2014, Vol. 127, p122-128. 7p. |
| Subject Terms: | *Heat storage, Decanol, Graphite composites, Chemical stability, Phase change materials, Thermal conductivity |
| Abstract: | Abstract: Natural flake graphite was chemically intercalated to prepare expandable graphite. The expandable graphite was then expanded by means of microwave irradiation to obtain expanded graphite (EG). Tetradecanol (TD)/EG composite form-stable phase change materials (PCMs) were prepared by mixing TD with EG through an autoclave method. The highest loading of TD in the composite form-stable PCMs with good form-stability was 93wt%. The composite form-stable PCMs exhibited excellent thermal energy storage capacity. The melting enthalpy (ΔH m) and crystallization enthalpy (ΔH c) of the composite form-stable PCM containing 93wt% TD were 202.6 and 201.2J/g, respectively. However, the solid–solid phase transition of TD in the composite form-stable PCMs was hindered as TD was strongly absorbed by EG. As a result, the ΔH m and ΔH c of the composite form-stable PCMs were slightly lower than the theoretical value. The thermal conductivity of the composite form-stable PCMs was greatly enhanced by EG and was increased with the increasing of EG loading. The thermal conductivity of the composite form-stable PCM containing 7wt% EG attained 2.76W/mK. Besides, effects of the prepared EG on properties of the composite form-stable PCMs were compared with those of EG derived from commercially obtained expandable graphite. [Copyright &y& Elsevier] |
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| Database: | GreenFILE |
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