Roughness effects on contact angle measurements | Zendy

Bernard J. Ryan | Zendy; Kristin M. Poduska | Zendy

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Roughness effects on contact angle measurements

Author(s) -

Bernard J. Ryan,

Kristin M. Poduska

Publication year - 2008

Publication title -

american journal of physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.541

H-Index - 99

eISSN - 1943-2909

pISSN - 0002-9505

DOI - 10.1119/1.2952446

Subject(s) - contact angle , wetting , surface roughness , surface finish , surface (topology) , condensation , wetting transition , solid surface , mechanics , physics , optics , rough surface , capillary condensation , materials science , composite material , geometry , thermodynamics , chemical physics , chemistry , adsorption , mathematics , organic chemistry

We have developed a simple and economical procedure to demonstrate the effects of roughness and wetting fraction on the equilibrium contact angles of liquid droplets on solid surfaces. Contact angles for droplets placed on a rough surface, which wet only a portion of the surface, are larger than the contact angles of droplets formed by condensation of steam, which wet the surface more completely. These contact angle data facilitate assessments of changes in true surface area, due to surface roughening, as well as changes in the fractional contact areas of the water droplets, due to the formation of air pockets between the rough surface and the droplet

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