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Wetting a superomniphobic porous system.
J Cimadoro1, L Ribba, S Goyanes
1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Laboratorio de Polímeros y Materiales Compuestos (LP & MC), Instituto de Física de Buenos Aires (IFIBA-CONICET), Buenos Aires, Argentina. goyanes@df.uba.ar.
Multivalued surfaces, common in fabrics, can prevent wetting by supporting high pressures. This study reveals that liquid penetration through small pores is a first-order transition, with unique behavior at the omniphobic/omniphilic limit.
Area of Science:
- Surface Science
- Materials Science
- Fluid Dynamics
Background:
- Research often focuses on non-wetting surfaces.
- High-wetting resistance textures are found in applications requiring the opposite effect.
- Multivalued surfaces in fabrics and meshes are key to avoiding wetting.
Purpose of the Study:
- To experimentally and theoretically investigate the critical pressure for liquid movement through porous networks.
- To understand the transition from wetting to leaking in small apertures.
- To analyze behavior at the omniphobic/omniphilic limit.
Main Methods:
- Experimental studies of liquid penetration through porous networks.
- Theoretical modeling of critical pressures.
- Analysis of first-order transitions in wetting phenomena.
Main Results:
- Identified critical pressures for liquid movement through pore networks.
- Demonstrated that wetting and leaking are typically first-order transitions for small apertures.
- Observed singular behavior at the omniphobic/omniphilic limit (contact angle = π/2).
Conclusions:
- Multivalued surfaces play a crucial role in resisting wetting.
- Liquid penetration in small pores exhibits distinct transition characteristics.
- The omniphobic/omniphilic limit presents unique wetting behaviors.


