Nanoencapsulated n-tetradecane phase change materials with melamine–urea–formaldehyde–TiO2 hybrid shell for cold energy storage
Nanoencapsulated n-tetradecane phase change materials with melamine–urea–formaldehyde–TiO2 hybrid shell for cold energy storage
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三聚氰胺-尿素-甲醛-TiO2杂化壳纳米封装正十四烷相变材料用于冷能存储
DOI：
10.1016/j.colsurfa.2021.128162
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Hao Peng
中科院分区：
文献类型：
--
作者：
Jinghang Wang;Xinyu Zhai;Zunrui Zhong;Xinwen Zhang;Hao Peng
采用两步法制备了一系列以正十四烷为核材料、三聚氰胺-尿素-甲醛(MUF)-二氧化钛复合材料为壳材料的纳米包覆相变材料。原位聚合后分别采用溶胶凝胶法和共混改性法。对纳米包覆相变材料(NEPCM)样品的物理、化学和热性能进行了表征。在此基础上，建立了基于功效系数法的绩效综合评价体系。结果表明，溶胶-凝胶改性使纳米胶囊的平均直径显著增大，而共混方法对纳米胶囊的平均直径影响不大。所有NEPCM均表现出较高的化学稳定性和热稳定性。用溶胶-凝胶法(C14@MUF-Ti02-S1)改性的纳米相变材料的包覆率、熔融热容和起始分解温度最高，分别为68.6%、156.2 J·g-1和155.36℃。C14@MUF-TiO2S2在100h的质量损失最小，为44.2%，共混法C14@MUF-TiO2B1的产率最高，为53.87%。与未改性纳米相变材料相比，C14@MUF-TiO2-B3的导热系数提高了88.15%。因此，用2.2g二氧化钛溶胶进行溶胶-凝胶法修饰的样品的总功效系数最高，为0.843。
A series of nanoencapsulated phase change materials with n-tetradecane as the core material and melamine–urea–formaldehyde (MUF)–TiO2composite as the shell material was developed using a two-step method. Sol-gel and blending modification methods were respectively utilized after the in situ polymerization. The physical, chemical, and thermal properties of the nanoencapsulated phase change material (NEPCM) samples were characterized. Furthermore, a comprehensive performance evaluation system was established based on the efficacy coefficient method. The results indicated that the average diameter of the nanocapsules was significantly increased by the sol-gel modification and was slightly influenced by the blending method. All NEPCMs exhibited high chemical and thermal stability. The NEPCMs modified by the sol-gel method (C14@MUF–TiO2-S1) exhibited the best performance in terms of the encapsulation ratio, melting enthalpy, and onset decomposition temperature, which were 68.6%, 156.2 J·g-1, and 155.36 °C, respectively. C14@MUF–TiO2-S2 exhibited the lowest mass loss of 44.2% at 100 h. For the blending method, C14@MUF–TiO2-B1 had the highest yield of 53.87%. The thermal conductivity of C14@MUF–TiO2-B3 increased up to 88.15% compared with the unmodified NEPCMs. Therefore, modification by the sol-gel method with 2.2 g TiO2sol had the highest total efficacy coefficient of 0.843 among the samples.
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