Contact angle measurements on superhydrophobic carbon nanotube forests: Effect of fluid pressureC. Journet1, S. Moulinet2, C. Ybert1, S. T. Purcell1 and L. Bocquet1
1 Laboratoire de Physique de la Matière Condensée et Nanostructures, UMR CNRS and Université de Lyon - 43 Boulevard du 11 Novembre, 69622 Villeurbanne France
2 Laboratoire de Physique Statistique, ENS - 24 rue Lhomond, 75231 Paris, France
received 7 March 2005; accepted in final form 9 May 2005
published online 27 May 2005
In this paper the effect of pressure on the contact angle of a water drop on superhydrophobic carbon nanotube (CNT) forests is studied. Superhydrophobic CNT forests are obtained from a new and simple functionalization strategy, based on the gold-thiol affinity. Using a specifically devised experimental setup, we then show that these surfaces are able to withstand high excess pressures (larger than 10) without transiting toward a roughness-invaded state, therefore preserving their low adhesion properties. Together with the relatively low technical cost of the process, this robustness vs. pressure makes such surfaces very appealing for practical integration into microfluidic systems.
68.08.Bc - Wetting.
05.70.Np - Interface and surface thermodynamics.
81.65.-b - Surface treatments.
© EDP Sciences 2005