期刊
JOURNAL OF MATERIALS SCIENCE
卷 51, 期 22, 页码 10104-10115出版社
SPRINGER
DOI: 10.1007/s10853-016-0239-3
关键词
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资金
- National Natural Science Foundation of China
- National Natural Science Foundation of Guangdong Province [U1401246]
- National Natural Science Foundation of China [51276044, 51502043]
- Guangdong Natural Science Foundation for Distinguished Young Scholar [2016A030306030]
- Natural Science Foundation of Guangdong Province of China [2014A030310382]
- Science and Technology Program of Guangdong Province of China [2014B010106005, 2015B010135011, 2015A050502047, 2016A020221031]
- Science and Technology Program of Guangzhou City of China [201508030018]
- Special Program for Public Interest Research and Capability Construction of Guangdong [2014A010105047]
In this study, composites consisting of well-dispersed TiO2 nanoparticles deposited on the surface of reduced graphene oxide (designed as TiO2-G) were fabricated via a facile synthesis method, namely in situ hydrolysis of TiCl4 and subsequently immobilization on the surface of reduced graphene oxide. TiO2-G/water nanofluids with the nanoparticles loading of 0.02, 0.03, 0.05, 0.07, and 0.1 wt% were prepared by ultrasonic probe in the condition without the addition of surfactants. Furthermore, the stability, zeta potential, and thermal conductivity of the TiO2-G/water nanofluids were analyzed by using different experimental methods. With the nanoparticles loading of 0.02 wt% (0.015 vol%) and 0.05 wt% (0.038 vol%), the zeta potential value of TiO2-G/water nanofluids can reach up to -46.49 and -37.44 mV, respectively, exhibiting great stability. Compared to that of the base fluid, the thermal conductivity of TiO2-G/water nanofluids increased with the increase of the loading of TiO2-G composite and the temperature of the nanofluids, and reached a maximum enhancement of similar to 33 % at a composite concentration of 0.1 wt% (0.078 vol%). Therefore, TiO2-G/water nanofluids can be applied to heat exchanger systems, as they provide a good long-time dispersion stability and a significant thermal conductivity enhancement.
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