Journal
NANO LETTERS
Volume 13, Issue 9, Pages 4028-4035Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl401097d
Keywords
Phase change material; carbon nanotube array; thermal energy storage; nanocomposite
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Funding
- National Basic Research Program of China [2009CB939902]
- Natural Science Foundation [91127004, 51102286]
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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.
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