title: Characterization of rough surfaces with vibrated drops.
abstract: Wetting transitions were studied with vertically-vibrated drops on various artificial and natural rough substrates. Alternative pathways of wetting transitions were observed. The model of wetting transition is presented. Multiple minima of the Gibbs free energy of a drop deposited on a rough surface explain alternative pathways of wetting transitions. We demonstrate that a wetting transition occurs when the constant force resulting from vibrations, Laplace and hydrostatic pressure acts on the triple line. It is shown that the final wetting states are mainly the Cassie impregnating wetting state with water penetrating the pores in the outer vicinity of the droplet or the Wenzel state with water inside the pores under the droplet whereas the substrate ahead the drop is dry.
authors.affiliation: Ariel University Center of Samaria, Applied Physics Faculty, Ariel, Israel.
authors.forename: Edward
authors.initials: E
authors.lastname: Bormashenko
authors.forename: Roman
authors.initials: R
authors.lastname: Pogreb
authors.forename: Tamir
authors.initials: T
authors.lastname: Stein
authors.forename: Gene
authors.initials: G
authors.lastname: Whyman
authors.forename: Mordechai
authors.initials: M
authors.lastname: Erlich
authors.forename: Albina
authors.initials: A
authors.lastname: Musin
authors.forename: Vladimir
authors.initials: V
authors.lastname: Machavariani
authors.forename: Doron
authors.initials: D
authors.lastname: Aurbach
mesh_terms: D008962:Models, Theoretical; D012996:Solutions / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D017155:Wettability
chemical_list: D012996:Solutions; D014867:Water