Improved thermal properties of paraffin wax by the addition of TiO2 nanoparticles

Jifen Wang, Huaqing Xie, Zhixiong Guo, Lihui Guan, Yang Li

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71 Scopus citations


TiO2 nanoparticles about 20 nm in diameter in the form of anatase were prepared and characterized. The nanoparticles were successfully dispersed into a paraffin wax (PW) matrix without any surfactant. The differential scanning calorimetric instrument and the transient short hot-wire method were used to measure the thermal properties of the TiO2/PW composites. It is found that the phase-change temperature and latent heat capacity vary with TiO2 nanoparticles loading levels. When the loading is not over 1 wt%, the phase-change temperature drops, and the latent heat capacity increases. When the loading is over 2 wt%, the phase-change temperature increases, and the latent heat capacity drops. A significant increase in latent heat capacity is found around 0.7 wt% loading. The thermal conductivity of the composites increases monotonically with increasing TiO2 loading. But such a tendency tends to decrease when the loading is over 3 wt%.

Original languageEnglish (US)
Pages (from-to)1541-1547
Number of pages7
JournalApplied Thermal Engineering
Issue number2
StatePublished - Dec 22 2014

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


  • Energy storage
  • Heat transfer enhancement
  • Latent heat
  • Nanoparticles
  • Phase-change composites
  • Thermal conductivity

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