> Yes, ferrofluid is already a thing, but this is different. Unlike the ferrofluid you may know and love (because come on, it is awesome)
Agree, know and love.
> When ferrofluid is removed from the presence of a magnetic field, the nanoparticles fall into disarray … For the new variant, when the magnetic field is taken away, there’s no room for surface particles to drift. The surface particoes somehow transfer their magnetism to the interior particles. The team doesn’t yet know how that happens. But it does, and the entire droplet just stays magnetised.
Just a weird thought, could you get a similar effect by replacing 1% of the iron oxide particles by hard iron permanent magnet nanoparticles?