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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Preparation and thermal conductivity of CuO nanofluid via a wet chemical method | Zhu et al. Nanoscale Research Letters 2011 6 181 http www.nanoscalereslett.eom content 6 1 181 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Preparation and thermal conductivity of CuO nanofluid via a wet chemical method Haitao Zhu Dongxiao Han Zhaoguo Meng Daxiong Wu Canying Zhang Abstract In this article a wet chemical method was developed to prepare stable CuO nanofluids. The influences of synthesis parameters such as kinds and amounts of copper salts reaction time were studied. The thermal conductivities of CuO nanofluids were also investigated. The results showed that different copper salts resulted in different particle morphology. The concentration of copper acetate and reaction time affected the size and shape of clusters of primary nanoparticles. Nanofluids with different microstructures could be obtained by changing the synthesis parameters. The thermal conductivities of CuO nanofluids increased with the increase of particle loading. Introduction Nanofluid is a new class of heat transfer fluids containing nano-sized particles fibers or tubes that are stably suspended in a carrier liquid 1-4 . Since the concept of nanofluid was proposed 1 more and more researchers have been committing to it because of the thermal properties and the potential applications associated with heat transfer mass transfer wetting and spreading 1-7 . Preparation of stable nanofluids is the first step and key issue of nanofluid research and applications. At present some methods such as dispersion method direct evaporation condensation method DECM submerged-arc nanoparticles synthesis system SANSS laser ablation method and wet chemical method etc. 2-4 8-12 have been applied to synthesize nanofluids. Dispersion method is a two-step method 13-18 in which commercial nanoparticles are dispersed into base fluid under ultrasonic agitation or mechanical stirring. The advantage of this method is that it could prepare nanofluids in a large scale. However .
