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Effect of Wettability on Micro- and Nanostructure Surface Using Sessile Droplet Contact Angle for Heat Transfer Application

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

This experimental investigation studied the variation in the dynamic contact angle measured on copper surface roughened by emery with grit size of 320, 600, 1000, 1500 and 2000 and titanium oxide nanoparticle-coated nanostructure with thickness of 250, 500, 750 and 1000 nm on copper substrates by e-beam evaporation process using deionized water as liquid with the help of macroscopic contact angle meter. In case of emery-roughened copper, advancing contact angle increases with the increase in emery grit size. For nanoparticle-coated surface, initially with the increase in coating thickness from 250 up to 750 nm, advancing contact angle increases; after that, further increasing in coating thickness to 1000 nm, advancing contact angle diminishes. Generally, the contact angle was found to vary from 30° to 60° for deionized water droplet for the nanoparticle-coated surface having different thickness. The surfaces are characterized with respect to morphology and topography to know the particle size and shape and particle distribution pattern and surface roughness with the help of AFM and FEG-SEM. The theoretical analysis is also carried out to determine the dependency of contact angle and roughness on the nanoparticle-coated titanium oxide thin-film surface. This formulation qualitatively showed a similar trend with experimental results.

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Abbreviations

H :

Hysteresis

S :

Spreading coefficient

Φ :

Diameter

ϒ :

Surface free energy

Θ :

Contact angle

AFM:

Atomic force microscopy

SEM:

Scanning electron microscopy

SFE:

Surface free energy

CA:

Contact angle

NP:

Nanoparticle

s:

Solid surface

s:

Solid–liquid interface

l:

Liquid surface

ap:

Apparent

th:

Thin film

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Acknowledgements

We are thankful to SAIF, IIT Bombay, CRF, IIT Patna, and CRF, NIT Agartala, for samples characterization such as FESEM, MCA and AFM.

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Authors and Affiliations

  1. Department of Chemical Engineering, National Institute of Technology Agartala, Agartala, Tripura, India

    Sudev Das

  2. Department of Mechanical Engineering, TIT Agartala, Agartala, Tripura, India

    Biswajit Majumder

  3. Department of Mechanical Engineering, National Institute of Technology Agartala, Agartala, Tripura, India

    Swapan Bhaumik

Authors
  1. Sudev Das
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  2. Biswajit Majumder
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  3. Swapan Bhaumik
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Correspondence to Sudev Das.

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Das, S., Majumder, B. & Bhaumik, S. Effect of Wettability on Micro- and Nanostructure Surface Using Sessile Droplet Contact Angle for Heat Transfer Application. Iran J Sci Technol Trans Mech Eng 41, 129–140 (2017). https://doi.org/10.1007/s40997-016-0046-0

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  • DOI: https://doi.org/10.1007/s40997-016-0046-0

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