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

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Abstract

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.

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Abbreviations

µ :

Viscosity (Pa s)

ϕ :

Volume concentration (%)

m :

Mass (kg)

ρ :

Density (kg m−3)

k :

Thermal conductivity (W m−1 K−1)

\(D_{\text{c}}\) :

Diffusion coefficient

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

Boltzmann constant

T :

Absolute temperature

r :

Radius of the particles

b:

Base fluid (deionized water)

n:

Nanoparticles

nf:

Nanofluid

EG:

Ethylene glycol

TC:

Thermal conductivity

Ag/ZnO:

Silver-coated zinc oxide nanoparticles

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Authors and Affiliations

  1. Department of Mechanical Engineering, The LNM Institute of Information Technology, Jaipur, 302031, India

    Surendra D. Barewar & Sandesh S. Chougule

  2. Department of Physics, The LNM Institute of Information Technology, Jaipur, 302031, India

    J. Jadhav & S. Biswas

Authors
  1. Surendra D. Barewar
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  2. Sandesh S. Chougule
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  3. J. Jadhav
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  4. S. Biswas
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Correspondence to Sandesh S. Chougule.

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Barewar, S.D., Chougule, S.S., Jadhav, J. et al. Synthesis and thermo-physical properties of water-based novel Ag/ZnO hybrid nanofluids. J Therm Anal Calorim 134, 1493–1504 (2018). https://doi.org/10.1007/s10973-018-7883-6

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