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Thermal conductivity studies on magnetite nanofluids coated with short-chain and long-chain fatty acid surfactants

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Abstract

The effect of the length of surfactant molecules on the surface of the nanoparticles on the thermal conductivity of nanofluids is studied. Magnetite (\(\hbox {Fe}_{3}\hbox {O}_{4}\)) nanoparticles of comparable sizes are stabilized with short-chain capric acid (\(\hbox {C}_{9}\hbox {H}_{19}\hbox {COOH}\)) and long-chain stearic acid (\(\hbox {C}_{17}\hbox {H}_{35}\hbox {COOH}\)) molecules. Thermal conductivity of the two surfactant-coated magnetite nanoparticles dispersed in toluene is measured as a function of the concentration of the particles in the fluids and in the presence of a magnetic field. Studies showed that the critical concentration for thermal conductivity enhancement is lower for stearic-acid-coated fluid as compared with the capric-acid-coated fluid. Comparable enhancement in the thermal conductivity is observed at higher concentrations of the particles. Relatively larger enhancement in the thermal conductivity is observed for the capric-acid-coated fluid in a magnetic field. The difference in the enhancement in the thermal conductivity, depending on the chain length of the surfactant, is explained in terms of the inter-particle magnetic interactions and formation of clusters.

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Acknowledgements

R Lenin and A Dadwal are thankful to University Grants Commission (UGC) for financial support in the form of research fellowship.

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Authors and Affiliations

  1. Physical and Materials Chemistry Division, Academy of Scientific and Innovative Research (AcSIR), CSIR-National Chemical Laboratory, Pune, 411008, India

    R Lenin, A Dadwal & P A Joy

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  1. R Lenin
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  2. A Dadwal
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  3. P A Joy
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Correspondence to P A Joy.

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Lenin, R., Dadwal, A. & Joy, P.A. Thermal conductivity studies on magnetite nanofluids coated with short-chain and long-chain fatty acid surfactants. Bull Mater Sci 41, 120 (2018). https://doi.org/10.1007/s12034-018-1638-7

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  • DOI: https://doi.org/10.1007/s12034-018-1638-7

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