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One-pot synthesis of ultrafine TiO2 nanoparticles with enhanced thermal conductivity for nanofluid applications

Zuo-Bin Qin,Liang Tan,Zhao-Qing Liu,Shuang Chen,Ji-Hua Qin,Jie-Jian Tang,Nan Li

The ultrafine TiO 2 nanoparticles (NPs) have been successfully prepared through a facile one-pot hydrothermal approach by stearic acid modification. The as-prepared ultrafine TiO 2 NPs with average particle size of 5.9   nm have been fabricated into oil-based nanofluids, which exhibit significantly enhanced thermal conductivity and long term stability. The maximum thermal conductivity enhancement of about 44.6% was achieved at 25   °C with the 0.05% volume fraction of TiO 2 NPs. The effect of nanoparticle loading and temperature on the thermal conductivity of the nanofluids was also carefully investigated.