Phase change nanocomposites with tunable melting temperature and thermal energy storage density
Phase change nanocomposites with tunable melting temperature and thermal energy storage density
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DOI：
10.1039/c3nr02842a
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Wang, Robert Y.
中科院分区：
文献类型：
--
作者：
Liu, Minglu;Wang, Robert Y.
尺寸相关熔化将熔化温度从化学成分中分离出来，为相变材料的应用提供了一个新的设计变量。为了证明这一潜力，我们创造了纳米复合材料，通过许多熔融冷冻循环表现出稳定和可调的熔融温度。这些复合材料由嵌入聚酰亚胺（PI）树脂基体中的Bi纳米颗粒（NPs）的单分散系综组成。Bi纳米颗粒作为相变组分运行，而PI树脂基质在熔融-冷冻循环期间防止纳米颗粒聚结。我们通过改变NP直径来调节这些复合材料的熔化温度和熔化焓。调节NP体积分数还控制复合材料的热能储存密度。因此，可以利用尺寸效应来调节相变材料中的相变温度和能量密度。
Size-dependent melting decouples melting temperature from chemical composition and provides a new design variable for phase change material applications. To demonstrate this potential, we create nanocomposites that exhibit stable and tunable melting temperatures through numerous melt-freeze cycles. These composites consist of a monodisperse ensemble of Bi nanoparticles (NPs) embedded in a polyimide (PI) resin matrix. The Bi NPs operate as the phase change component whereas the PI resin matrix prevents nanoparticle coalescence during melt-freeze cycles. We tune melting temperature and enthalpy of fusion in these composites by varying the NP diameter. Adjusting the NP volume fraction also controls the composite's thermal energy storage density. Hence it is possible to leverage size effects to tune phase change temperature and energy density in phase change materials.