We have evaluated the surface energy and characterized the wettability of cluster-assembled carbon films deposited on polyethylene, Si and Al substrates by a sessile-drop method using water and glycerol. The effective surface energy of nanostructured carbon is of the order of 30 mJ/m(2) as calculated using the Fowkes approach. The advancing contact angle (66-83degrees) is found to increase with surface roughness, i.e. the surface becomes more hydrophobic as the roughness increases. This behavior is ascribed to gas trapping in pores of the film with a self-affine surface. It is argued that the wettability of nanostructured carbon and other cluster-assembled coatings can be tuned simply by controlling the surface topography, through a suitable control of the deposition parameters, such as the cluster size distribution.
Influence of surface morphology on the wettability of cluster-assembled carbon films / L. Ostrovskaya, A. Podestà, P. Milani, V. Ralchenko. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 63:3(2003), pp. 401-407.
Influence of surface morphology on the wettability of cluster-assembled carbon films
A. PodestàSecondo
;P. MilaniPenultimo
;
2003
Abstract
We have evaluated the surface energy and characterized the wettability of cluster-assembled carbon films deposited on polyethylene, Si and Al substrates by a sessile-drop method using water and glycerol. The effective surface energy of nanostructured carbon is of the order of 30 mJ/m(2) as calculated using the Fowkes approach. The advancing contact angle (66-83degrees) is found to increase with surface roughness, i.e. the surface becomes more hydrophobic as the roughness increases. This behavior is ascribed to gas trapping in pores of the film with a self-affine surface. It is argued that the wettability of nanostructured carbon and other cluster-assembled coatings can be tuned simply by controlling the surface topography, through a suitable control of the deposition parameters, such as the cluster size distribution.Pubblicazioni consigliate
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