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HomeJournal of Nano ResearchJournal of Nano Research Vol. 60Effect of Water Temperature, pH Value, and Film...

Effect of Water Temperature, pH Value, and Film Thickness on the Wettability Behaviour of Copper Surfaces Coated with Copper Using EB-PVD Technique

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Abstract:

This research investigates the effect of surface roughness, water temperature, and pH value on the wettability behaviour of copper surfaces. An electron beam physical vapour deposition technique was used to fabricate 25, 50, and 75 nm thin films of copper on the surface of copper substrates. Surface topographical analysis, of the uncoated and coated samples, was performed using an atomic force microscopy device to observe the changes in surface microstructure. A goniometer device was then employed to examine the surface wettability of the samples by obtaining the static contact angle between the liquid and the attached surface using the sessile drops technique. Waters of pH 4, 7, and 9 were employed as the contact angle testing fluids at a set of fixed temperatures that ranged from 20°C to 60°C. It was found that increasing the deposited film thickness reduces the surface roughness of the as-prepared copper surfaces and thus causing the surface wettability to diverge from its initial hydrophobic nature towards the hydrophilic behaviour region. A similar divergence behaviour was seen with the rise in temperature of water of pH 4, and 9. In contrast, the water of pH 7, when tested on the uncoated surface, ceased to reach a contact angle below 90^o. It is believed that the observed changes in surface wettability behaviour is directly linked to the liquid temperature, pH value, surface roughness, along with the Hofmeister effect between the water and the surface in contact.

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Journal of Nano Research Vol. 60

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Periodical:

Journal of Nano Research (Volume 60)

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124-141

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https://doi.org/10.4028/www.scientific.net/JNanoR.60.124

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Online since:

November 2019

Authors:

Naser Ali*, Joao Amaral Teixeira, Abdulmajid Addali

Keywords:

Coating, Contact Angle, pH Value, Surface Topography, Wettability

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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