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Swimming Tentacled Droplets

posted by Jason Kottke   Jul 19, 2021

Well, this is really quite odd. A group of scientists discovered that if they cool ordinary oily droplets floating in water down to around 2-8°C, they change shape, grow tentacles, and propel themselves around like tiny little sci-fi creatures.

Some of the particles’ facets grow while other shrink, producing a variety of geometrical forms such as kites, isosceles triangles and spiked tetrahedra. Then, from some of the sharp corners emerge tentacle-like strands, as if being extruded from a nozzle. As they grow, the strands bend into undulating shapes — and the droplets start to swim, propelled through the fluid by the tentacles’ extension.