Phase change heat insulation based on wax-clay nanotube composites

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Abstract

Wax can be used as a phase change material in solar energy storage but has low thermal conductivity and cannot sustain shape at higher temperature (above 55 °C). Introducing 50% halloysite clay nanotubes into wax yields a stable and homogenous phase change composite with thermal conductivity of 0.36Wm-1 K-1 and no leaking until 70 °C. Graphite and carbon nanotubes can further increase the conductivity and shape stabilized temperature as high as 1.4Wm-1 K-1 and 91° C. Vectorial thermal energy transfer for double layers of different composition was demonstrated: heat flux difference in the opposite directions differed by 25%. The new wax-nanoclay composite is a promising heat storage material due to good heat capacity, high thermal conductivity and ability to preserve its shape during wax melting.

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Zhao, Y., Thapa, S., Weiss, L., & Lvov, Y. (2014). Phase change heat insulation based on wax-clay nanotube composites. Advanced Engineering Materials, 16(11), 1391–1399. https://doi.org/10.1002/adem.201400094

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