Ferrofluid: Difference between revisions

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Ferrofluid is a [http://en.wikipedia.org/wiki/Colloid colloid] with ferrous particles,
Ferrofluid comes down to a ([http://en.wikipedia.org/wiki/Colloid colloidal]) suspension
meaning that the particles and therefore the fluid as a whole will magnetize when exposed to a strong magnetic field.
of a magnetic (iron) in a solvent.


Proper ferrofluid apparently coasts the particles to avoid clumping.
That the particles and therefore the fluid as a whole will magnetize when exposed to a strong magnetic field.
Ferrofluid is not cheap, though I don't know why.


You can however make a pretty decent imitation with ''fine'' iron fillings and oil.
The 'fine' part is the hard part, though - taking a file filing some nails isn't fine enough.


One of the easiest sources of fine-enough ferrous particles is probably toner -- some toner, at least,
The magnetic compound used is often magnetite.
because aside from carbon powder and polymer (plastic) contain iron oxide, specifically magentite {{verify}}.


For the oil you can use almost anything - some vegetable or mineral oil.{{verify}}


Mix the two. Proportions matter to consistency. Experiment.
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


It's mainly plastic and iron, so it's pretty safe if you avoid drinking it.


It ''is'' messy.


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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Latest revision as of 13:29, 10 April 2024

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