Issue |
Europhys. Lett.
Volume 63, Number 3, August 2003
|
|
---|---|---|
Page(s) | 401 - 407 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2003-00538-7 | |
Published online | 01 November 2003 |
Influence of surface morphology on the wettability of cluster-assembled carbon films
1
Institute for Superhard Materials - Avtozavodskaya str. 2, 254074 Kiev, Ukraine
2
INFM, Dipartimento di Fisica, Università di Milano Via Celoria 16, 20133 Milano, Italy
3
General Physics Institute - Vavilova str. 38, 119991 Moscow, Russia
Received:
27
December
2002
Accepted:
2
June
2003
We have evaluated the surface energy and characterized the wettability of cluster-assembled carbon films deposited on polyethylene, and substrates by a sessile-drop method using water and glycerol. The effective surface energy of nanostructured carbon is of the order of 30 as calculated using the Fowkes approach. The advancing contact angle (66–83°) 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.
PACS: 68.08.Bc – Wetting / 68.35.Ct – Interface structure and roughness / 81.07.-b – Nanoscale materials and structures: fabrication and characterization
© EDP Sciences, 2003
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