Wetting at Superhydrophobic Surfaces: Surfactants at Oil- Water-Solid Interface (Abstract/Poster in atti di convegno)

Type
Label
  • Wetting at Superhydrophobic Surfaces: Surfactants at Oil- Water-Solid Interface (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ferrari M.; Ravera F.; Liggieri L.; Rao S. (2006)
    Wetting at Superhydrophobic Surfaces: Surfactants at Oil- Water-Solid Interface
    in SIS 2006 : 16th International Sympsium on Surfactants in Solutions, Seoul (Korea)
    (literal)
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  • Ferrari M.; Ravera F.; Liggieri L.; Rao S. (literal)
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  • In: SIS 2006 : 16th International Sympsium on Surfactants in Solutions (Seoul (Korea), 4-9 June 2006). Proceedings, pp. 154-154. SIS06, 2006. (literal)
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  • Superhydrophobic surfaces, with a water-contact angle greater than 150°, have attracted great interest for both fundamental research and practical applications. In fact, due to the small contact area shown by these surfaces when in contact with water, interactions with aqueous environment are usually strongly reduced. Here an original methodology based on a mixed inorganic-organic coating in a multistep procedure is described here which allows a superhydrophobic surface to be prepared. Moreover the effect of surfactant solutions in terms of chain length and class of amphiphiles like SDS, CTAB, phosphine oxides and CiEjs on the wetting of these superhydrophobic surfaces by oil-water and air-water systems. Chemical composition and geometrical structure of the surface are significant parameters governing the extreme hydrophobicity of a solid substrate. By acting on the surfactant type and concentration, the spreading of a drop on a solid surface featuring a specific hydrophobic property can be controlled confining the volume by modification of physico-chemical parameters. The presence of surfactants is effective in lowering the contact angle in a hydrophobic or still superhydrophobic range. The reduced area in contact with the solid surface allows a limitation of adsorbing area available and then the spreading will be controlled in a very finite space with surfactants acting as a switch from a Cassie to a Wenzel substrate. Due to the adsorption at the solid surface and the increasing of the ionic strength, hydrophilic domains are created enhancing the contact angle hystheresis. These data support the hypothesis of the major role played by the adsorption at the solid-liquid interface in comparison with the modification of the contact angle due to the surface tension and then to the adsorption at the liquid-fluid interface. (literal)
Titolo
  • Wetting at Superhydrophobic Surfaces: Surfactants at Oil- Water-Solid Interface (literal)
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