Tailoring Carbon Nanotube Density for Modulating Electro-to-Heat Conversion in Phase Change Composites
Tailoring Carbon Nanotube Density for Modulating Electro-to-Heat Conversion in Phase Change Composites
复制标题
定制碳纳米管密度以调节相变复合材料中的电热转换
DOI：
10.1021/nl401097d
复制
发表时间：
2013-09-01
期刊：
影响因子：
10.8
通讯作者：
Cao, Anyuan
中科院分区：
文献类型：
--
作者：
Liu, Zhenpu;Zou, Ruqiang;Cao, Anyuan
我们报道了一种碳纳米管阵列封装的相变复合材料，其中纳米管的分布（或面密度）可以通过单轴压缩来定制。将正二十烷（C20）渗透到多孔阵列中以制备高导电性纳米复合材料，同时保持纳米管分散和基质之间的连接，并通过沿着横向方向的压缩应变确定受控的纳米管面密度。所得的导电复合材料可以在低至1V的驱动电压下以快速存储热量，具有高的电-热转换效率。增加纳米管的密度，显着提高聚合物的结晶度，并降低电压诱导的相变过程。我们的研究结果表明，组织良好的纳米结构，如纳米管阵列是有前途的候选人，以建立高性能的相变复合材料，简化了制造工艺和调制的结构和性能。
We report a carbon nanotube array-encapsulated phase change composite in which the nanotube distribution (or areal density) could be tailored by uniaxial compression. The n-eicosane (C20) was infiltrated into the porous array to make a highly conductive nanocomposite while maintaining the nanotube dispersion and connection among the matrix with controlled nanotube areal density determined by the compressive strains along the lateral direction. The resulting electrically conductive composites can store heat at driven voltages as low as 1 V at fast speed with high electro-to-heat conversion efficiencies. Increasing the nanotube density is shown to significantly improve the polymer crystallinity and reduce the voltage for inducing the phase change process. Our results indicate that well-organized nanostructures such as the nanotube array are promising candidates to build high-performance phase change composites with simplified manufacturing process and modulated structure and properties.