Abstract
Experiments were conducted on the preparation of manganese ferrite nanoparticles and their surface modification for dispersion in propylene glycol. The appropriate concentrations of ferrous sulphate and manganese sulphate (precursors) for synthesis of uniform Mn0.43Fe2.57O4 nanoparticles (size range ~20–25 nm) were found to be 0.05 and 0.025 M, respectively. These nanoparticles were coated with citric acid and dispersed in propylene glycol for the preparation of nanofluids. The effects of temperature and nanoparticle concentration on nanofluid viscosity and thermal conductivity have been studied. Our study on the influence of nanoparticle concentration on viscosity reveals the existence of a viscosity minimum for 0.25 vol% of citric acid-modified Mn0.43Fe2.57O4–propylene glycol nanofluid. A thermal conductivity enhancement of 68 % was observed for 2 vol% nanofluid. Correlating viscosity and thermal conductivity measurements, particle clustering seems to be the major factor responsible for thermal conductivity enhancement.
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Acknowledgments
This work was supported by (i) PG teaching Grant No: SR/NM/PG-16/2007 of Nano Mission Council, Department of Science & Technology (DST), India, (ii) Grant No: SR/FT/ET-061/2008, DST, India, (iii) Research & Modernization Project #1, SASTRA University, India and (iv) INSPIRE fellowship (IF 110312), Department of Science & Technology (DST), India.
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Aishwarya, V., Suganthi, K.S. & Rajan, K.S. Transport properties of nano manganese ferrite–propylene glycol dispersion (nanofluids): new observations and discussion. J Nanopart Res 15, 1774 (2013). https://doi.org/10.1007/s11051-013-1774-3
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DOI: https://doi.org/10.1007/s11051-013-1774-3