title: Wetting transitions in two-, three-, and four-phase systems.
abstract: We discuss wetting of rough surfaces with two-phase (solid-liquid), three-phase (solid-water-air and solid-oil-water), and four-phase (solid-oil-water-air) interfaces mimicking fish scales. We extend the traditional Wenzel and Cassie-Baxter models to these cases. We further present experimental observations of two-, three-, and four-phase systems in the case of metal-matrix composite solid surfaces immersed in water and in contact with oil. Experimental observations show that wetting transitions can occur in underwater oleophobic systems. We also discuss wetting transitions as phase transitions using the phase-field approach and show that a phenomenological gradient coefficient is responsible for wetting transition, energy barriers, and wetting/dewetting asymmetry (hysteresis).
authors: College of Engineering & Applied Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA.
authors: Vahid
authors: V
authors: Hejazi
authors: Michael
authors: M
authors: Nosonovsky
mesh_terms: D000388:Air; D000497:Alloys / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D008962:Models, Theoretical; D009821:Oils / Q000737:chemistry; D044367:Phase Transition; D014867:Water / Q000737:chemistry; D017155:Wettability
chemical_list: D000497:Alloys; D009821:Oils; D014867:Water; D006108:Graphite