Scanning droplets

Animated video depicts the way a movable stage inside the Scanning Electron Microscope (SEM) moves to change the angle of the surface, and a wire (curved gray cylinder) that can be used to push and pull a droplet over the surface.

Sequences of high-resolution images captured using the SEM show how the base of a water droplet forms small "necks" as it moves across a surface that has pillars etched on it to increase its water-shedding properties. These necks control the adhesion of the drop to the surface, and are important in designing superhydrophobic (water-repellent) materials.

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Adam Paxson and Kripa Varanasi