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Thermal Properties of Lauric Acid Filled in Carbon Nanotubes as Shape-stabilized Phase Change Materials

Abstract

Carbon nanotubes (CNTs) filled with lauric acid (LA) as a kind of shape-stabilized phase change material were prepared of which the structures and phase change properties were characterized. The results showed that the melting point and latent heat of LA confined in carbon nanotubes were lower than those of the bulk material, and both decrease as the diameters of CNTs and the filling ratios of LA decrease. Molecular dynamics (MD) simulations indicated that the LA molecules form a liquid layer near the pore walls and crystallize in the pore center. When the LA’s filling ratio was reduced to a certain value, all LA molecules are attached to the inner walls of CNTs, hindering their crystallization. A linear relationship between melting temperature shift and structural properties was obtained based on the modified Gibbs–Thomson equation, which gives a reliable interpretation of the size effect of nanochannels in phase change materials. We also found that the thermal conductivity of the composite CNTs/LA was four times larger than that of pure LA. This study will provide insights into the design of novel composite phase change materials with better thermal properties by the selection of suitable porous materials and tailoring their pore structures.

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Publication details

The article was received on 21 Dec 2017, accepted on 14 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP08557E
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Thermal Properties of Lauric Acid Filled in Carbon Nanotubes as Shape-stabilized Phase Change Materials

    Y. Feng, R. Wei, Z. Huang, X. Zhang and G. Wang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08557E

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