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2012-03-02 Ferrofluids

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March 2nd 2012

Ferrofluids

Ferrofluids are liquids containing magnetized nanoparticles in suspension, which makes the liquid sensitive to magnetic fields. Magnetic forces combined with the surface tension of the liquid produce surprising effects.

There are now many videos on the internet showing the nice "spikes" that the liquid developps when a magnet is placed above or under it. See for instance this video.


The following video is more unusual. The ferrofluid lies in a shallow dish, together with a transparent liquid with which it cannot mix. Because the pool is shallow, it cannot develop spikes and rather display interesting wall structures, quite reminiscent of Turing patterns.


Ferrofluids already appeared once on this blog. The second video above was spotted on this nice tumblr blog, featuring various effects related to fluid dynamics.

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