Currently, many (nano)structures are grown in layers, one above the other, but their ordering on the atomic scale is generally far from perfect. Researchers from the University of Twente have aimed for a better understanding of these processes that can eventually lead to smaller, faster and overall better nanotechnology and have, in a worldwide first observation, discovered pre-solidification in droplet mixture. They recently published these exciting findings in the journal Physical Review Letters.
are composed of a mixture of the metals platinum and germanium and move on a heated substrate in the direction of the heat source. But as soon as the temperature lowers, the droplets start their unique behavior. Like professional skiers, they suddenly change their direction and make a slalom.and show the whole process of solidifying," explains Arie van Houselt, corresponding author of the publication.
A video of the skiing behavior. Filmed with a photo-emission electron microscopy, total duration is 2000 seconds, the field of view is 150 μm. Credit: University of Twente The skiing droplets form at surprisingly high temperatures."This happens at ninety degrees above their eutectic point, which is theat which these types of mixtures freeze. The droplets don't solidify all at once. They first elongate and then the solidifying process starts at the bottom. On their interface with the substrate," explains Van Houselt.
This first solid layer also explains the skiing. When the material solidifies, it gains a nanostructure which acts as a grid on which the droplet can move. The nanostructure lowers the resistance of the droplets in another direction. The droplets make use of this lowered resistance and make a sharp turn. They start moving in this direction.This remarkable display isn't just an entertaining performance at the nanoscale.
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