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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 74: Friction and Lubrication

CPP 74.2: Vortrag

Donnerstag, 19. März 2015, 17:30–17:45, C 243

Motion of drops on slippery surfaces — •Frank Schellenberger, Doris Vollmer, and Hans-Jürgen Butt — Max Planck Institute for Polymer Research, Mainz, Germany

Liquid repellent, antibiofouling, pressure-stable and self-repairing surfaces would have enormous impact in industrial and medical applications. Slippery lubricant infused textured surfaces may open up novel possibilities. When a liquid drop is deposited on a slippery surface, the drop is found to slip by tilting the surface a few degrees. With the drop, dirt or also bacteria can be removed.

We used Laser Scanning Confocal Microscopy (LSCM) to observe the behavior of drops of different liquids on a lubricant infused textured surface. As textured surface we used micropillar arrays and inverse opals to hold different lubricants.

We investigated the shape of the wetting ridge surrounding a drop, the three phase contact lines, and how a drop advances and recedes on slippery surfaces. Single pinning and depinning events are resolved with micrometer and millisecond resolution. Even, cloaking of the drop is visible by using LSCM. Confocal microscopy revealed that drops on slippery surfaces have a high contact angle, typically exceeding 150°.

We expect that this understanding of the stationary and dynamic behavior or drop on slippery lubricant infused surfaces will help to design stable slippery lubricant infused surfaces.