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Contact angle hysteresis: surface morphology effects

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Abstract

Irradiation of metallic surfaces using ultra-short pulse laser results in a dual-scale structure. While metallic surfaces are superhydrophilic immediately after laser irradiation, prolonged exposure to air renders surfaces superhydrophobic due to surface reactions and deposition of carbonaceous materials onto the surface. In this work, we have fabricated a paraboloid microstructure, which is analyzed thermodynamically through the use of the Gibbs free energy to obtain the equilibrium contact angle and contact angle hysteresis. The effects of the geometrical details on maximizing the superhydrophobicity of the nanopatterned surface are also discussed in an attempt to design surfaces with desired and/or optimum wetting characteristics.

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Abbreviations

A p :

Pillar area

A v :

Area between pillars

D :

Base diameter of paraboloid

F :

Gibbs free energy per unit length of contact line

f sl :

Fraction of projected solid area in contact with liquid

H :

Pillar height

H 1 :

Penetrated liquid height in the composite state

L i :

Droplet width at a given (point) state

l la :

Arc length of droplet in contact with air

l ls :

Arc length difference of liquid–solid contact line for two given states

R :

Radius of curvature of the droplet profile

r f :

Roughness factor

P :

Base-to-base distance of pillars (pitch)

α :

Slope angle

γ la :

Liquid–air interfacial tension

γ sa :

Solid–air interfacial tension

γ sl :

Solid–liquid interfacial tension

θ app :

Apparent contact angle

θ CB :

Cassie–Baxter state contact angle

θ flat :

Intrinsic contact angle

θ i :

Apparent contact angle at a given ( point i ) state of the drop

θ w :

Wenzel state contact angle

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, V6T 1Z3, Canada

    Sona Moradi, Peter Englezos & Savvas G. Hatzikiriakos

Authors
  1. Sona Moradi
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  2. Peter Englezos
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  3. Savvas G. Hatzikiriakos
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Corresponding author

Correspondence to Savvas G. Hatzikiriakos.

Additional information

This article is part of the Topical Collection on Contact Angle Hysteresis

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Moradi, S., Englezos, P. & Hatzikiriakos, S.G. Contact angle hysteresis: surface morphology effects. Colloid Polym Sci 291, 317–328 (2013). https://doi.org/10.1007/s00396-012-2746-3

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  • DOI: https://doi.org/10.1007/s00396-012-2746-3

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