Teflon (polytetrafluoroethylene) surface has been modified with a single step oxygen-fed plasma process resulting in the formation of peculiar “sphere-on-cone” micro-scale relieves. Though presenting some irregularity and random distribution, surfaces with a steep variation of topography can be obtained by properly tuning plasma process parameters. We show that, though exhibiting similar superhydrophobic properties in terms of water contact angle, the ability to withstand vertically impacting water droplets falling at medium/high impacting speeds can be sensitively different. In particular, high repulsive properties characterize surfaces with denser and smaller relieves. In the other cases the occurrence of pinning events results in longer time-of-contact and a shorter time-of-flight of the drop. Interestingly, the impact pressure values at which pinning transitions have been observed are consistent with critical pressures for penetration calculated by modeling the surface as an array of spheres. When critical pressure is exceeded, and water penetration is expected, reversible or non reversible pinning can be explained on the basis of the wetting/de-wetting cycle within the sphere-on-cone's layer.

Sphere-on-cone microstructures on Teflon surface: Repulsive behavior against impacting water droplets

DI MUNDO, Rosa;BOTTIGLIONE, Francesco;CARBONE, Giuseppe
2016

Abstract

Teflon (polytetrafluoroethylene) surface has been modified with a single step oxygen-fed plasma process resulting in the formation of peculiar “sphere-on-cone” micro-scale relieves. Though presenting some irregularity and random distribution, surfaces with a steep variation of topography can be obtained by properly tuning plasma process parameters. We show that, though exhibiting similar superhydrophobic properties in terms of water contact angle, the ability to withstand vertically impacting water droplets falling at medium/high impacting speeds can be sensitively different. In particular, high repulsive properties characterize surfaces with denser and smaller relieves. In the other cases the occurrence of pinning events results in longer time-of-contact and a shorter time-of-flight of the drop. Interestingly, the impact pressure values at which pinning transitions have been observed are consistent with critical pressures for penetration calculated by modeling the surface as an array of spheres. When critical pressure is exceeded, and water penetration is expected, reversible or non reversible pinning can be explained on the basis of the wetting/de-wetting cycle within the sphere-on-cone's layer.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/58165
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • Scopus 16
  • ???jsp.display-item.citation.isi??? 16
social impact