Ferrofluid: Difference between revisions
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Ferrofluid | Ferrofluid comes down to a ([http://en.wikipedia.org/wiki/Colloid colloidal]) suspension | ||
of a magnetic (iron) in a solvent. | |||
That the particles and therefore the fluid as a whole will magnetize when exposed to a strong magnetic field. | |||
The magnetic compound used is often magnetite. | |||
Mangetite particles (or whatever you make it of) will want to stick together, | |||
so proper ferrofluid will often coat the particles in a way that avoids clumping, | |||
and the particles should be small before that coating, | |||
and ideally, the magnetite should also no separate from its solvent. | |||
...meaning a surfactant. | |||
All this is why this is neither cheap to buy or easy to DIY. | |||
The solvent can be water-based or oil-based, depending on what the coating is | |||
Have tissues for cleanup and don't let it near stuff that you wouldn't want close to ink. | |||
Magnetite in motor oil, or toner in oil, makes something more like a magnetorheological fluid, | |||
which has the property that it goes a lot more solid in a magnetic field, | |||
so while it works, will not do the liquid spiky thing. | |||
They are also more likely to separating out and solidifying, temporarily or almost-permanently. | |||
Also, toner is not all that magnetic, because aside from magnetite they are also considerable carbon and polymer. {{verify}}. | |||
But if you have some to play with and don't care about quality or long term, | |||
then mix it with some vegetable or mineral oil and have fun.{{verify}} | |||
It's mainly plastic and iron and oil, so it's pretty safe if you avoid drinking it. | |||
It ''is'' messy, though. | |||
Have tissues for cleanup | |||
and don't let it near stuff that you wouldn't want close to ink. | |||
'Ferrofluid displays' suspend it in something that this solution doesn't mix wity | |||
Ferrofluid is ''itself'' then sometimes placed into oil, as a place in can move in. | |||
This presents further details, like how much it avoids mixing over time | |||
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http://en.wikipedia.org/wiki/Ferrofluid | http://en.wikipedia.org/wiki/Ferrofluid | ||
https://www.youtube.com/watch?v=6L8yUY-doNc | |||
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