Breakthrough Pressure as a Tool to Probe the Characteristics of Silicon-Containing Liquid-Repellent Surfaces (Briefing Charts).

摘要

Although the breakthrough pressure needed for liquids to penetrate re-entrant surface textures has been considered typically as simply a dependent parameter arising from the combination of geometry and thermodynamic interaction characteristics of the surface, it has the advantage of often being one of easiest parameters to determine experimentally with good precision. In fact, for many types of textures, including "random" media such as fibrous filters, or textures formed by growth or deposition of nanoparticles, it is far easier to quantify the breakthrough pressure than to quantify the geometry or the equilibrium contact angle. This presentation will explore the use of experimentally-determined breakthrough pressures (in combination with surface imaging and apparent contact angle measurements) to infer important geometric and thermodynamic characteristics of liquid repellent surfaces. Data are presented for two relevant examples, silicone coated "phase separator" membranes and silane-treated aluminum oxide "nanograss" textures.