Breakthrough in Understanding Droplet Adhesion to Surfaces
Added Feb 20, 2013 | Rate View top rated
Understanding exactly how droplets and bubbles stick to surfaces - such as dew on blades of grass - has eluded experimental answers. It’s a question with implications for everything from how to improve power-plant efficiency to how to reduce fogging on windshields. MIT researchers Kripa Varanasi and Adam Paxson have used a modified version of a scanning electron microscope (SEM) in which the dynamic behavior of droplets on surfaces at any angle could be observed in action at high resolution. 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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