Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1493–1504 | Cite as

Synthesis and thermo-physical properties of water-based novel Ag/ZnO hybrid nanofluids

  • Surendra D. Barewar
  • Sandesh S. Chougule
  • J. Jadhav
  • S. Biswas


The comparative study on the thermo-physical properties of water-based ZnO nanofluids and Ag/ZnO hybrid nanofluids is reported in the present study. The outer surface of ZnO nanoparticles was modified with a thin coating of Ag nanoparticles by a wet chemical method for improved stability and heat transfer properties. The ZnO and Ag/ZnO nanofluids were prepared with varying volume concentration (ϕ = 0.02–0.1%). The synthesized nanoparticles and nanofluids were characterized with different characterization methods viz., scanning electron microscopy, X-ray diffraction, dynamic light scattering, thermal conductivity measurement, and viscosity measurement. Results show that thermal conductivity of Ag/ZnO hybrid nanofluids is found to be significantly higher compared to ZnO nanofluids. The maximum thermal conductivity an enhancement for Ag/ZnO nanofluid (ϕ = 0.1%) is found to 20% and 28% when it compared with ZnO nanofluid (ϕ = 0.1%) and water, respectively.


ZnO nanofluids Ag/ZnO hybrid nanofluids Wet chemical method Thermal conductivity Viscosity 

List of symbols


Viscosity (Pa s)


Volume concentration (%)


Mass (kg)


Density (kg m−3)


Thermal conductivity (W m−1 K−1)


Diffusion coefficient

\(K_{\text{B }}\)

Boltzmann constant


Absolute temperature


Radius of the particles



Base fluid (deionized water)







Ethylene glycol


Thermal conductivity


Silver-coated zinc oxide nanoparticles


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Surendra D. Barewar
    • 1
  • Sandesh S. Chougule
    • 1
  • J. Jadhav
    • 2
  • S. Biswas
    • 2
  1. 1.Department of Mechanical EngineeringThe LNM Institute of Information TechnologyJaipurIndia
  2. 2.Department of PhysicsThe LNM Institute of Information TechnologyJaipurIndia

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