Abstract
Nanofluids were prepared by dispersing dodecanethiol-coated copper nanoparticles (~ 50 nm average diameter) in toluene. The stability and thermal conductivity of the nanofluids were investigated for various particle volume concentrations (0.09–1.5 vol%) and temperatures (293–333 K). The amount of dodecanethiol surfactant coated on the nanoparticle surface was determined by thermogravimetric analysis (TGA), and the chemical structure of adsorbed surfactant molecules was characterized by Fourier transform infrared spectroscopy (FT-IR). UV-vis absorbance analysis of the nanofluid was undertaken to determine the optimum ultrasonic vibration time for stability enhancement. The modeling study generated a new semi-practical correlation as a function of particle volume concentration and temperature for an existing Brownian motion–based thermal conductivity model, which demonstrated good compatibility with the present experimental measurements compared with other models.
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Funding
This study was funded by Young Scientific Researcher Training Program of Higher Education Institutions in Shanxi and the Basic Research Projects of Shanxi Province, China (grant number 201901D211024).
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L. Zhou, Y. F. Zhao, and H. H. Ma designed research; H. H. Ma conducted review and editing; L. Zhou provided funding acquisition, project administration, and resources; and L. Zhou and Y. F. Zhao wrote the paper.
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Zhou, L., Zhao, Y. & Ma, H. Experimental investigation on stability and thermal conductivity of dodecanethiol-coated copper nanofluids. J Nanopart Res 22, 199 (2020). https://doi.org/10.1007/s11051-020-04943-2
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DOI: https://doi.org/10.1007/s11051-020-04943-2