Reduction of Supercooling of Water by TiO₂ Nanoparticles as Nucleating Agent

Abstract:

The solidification behaviors of titania(TiO₂)-water nanofluid and deionized water (DI water) were investigated using differential scanning calorimetry (DSC) at cooling rates of 1.5—9.0 °C/min. The nanofluid with 0.3 wt% TiO₂ nanoparticles was prepared by dispersing the nanoparticles into DI water. The dispersion and stability was confirmed by a particle size and zeta potential analyzer. Experimental results show that the solidification temperature of the TiO₂-water nanofluid was higher than that of DI water at the same cooling rate. The contact angles of TiO₂ and the interior surface of the sample holder were measured, and the free energy barriers (FEB) of nucleation of the TiO₂-water nanofluid and DI water were calculated. It was found that the FEB of nucleation induced by the TiO₂ nanoparticles was lower than that by the flat surface, resulting in lower supercooling degree.

• Periodical: Advanced Materials Research (Volumes 236-238)
• Pages: 1935-1938
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.236-238.1935
• Online since: May 2011
• Authors: Song Ping Mo, Ying Chen, Li Si Jia, Xing Li, Xiang Long Luo
• Keywords: Differential Scanning Calorimetry (DSC), Free Energy Barrier, Nanofluid, Nucleation, Titania

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