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Ferrofluid

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Ian Dunn
243543.  Wed Dec 12, 2007 3:22 am Reply with quote

A ferrofluid is a liquid that becomes strongly polarised when exposed to a magnetic field. It is normally made out of small ferromagnetic particles trapped inside a liquid solution such as organic solvant or water.

What is quite interesting is what you can do with ferrofluid. You can use it as a seal in electronic devices, paint it onto warplanes to reduce detection from radar, makes lenses for telescopes, can be used to detect cancer or can be added in the shock absourbers in a car to improve stability.

But perhaps the most interesting is simply the use of ferrofluid for fun. Using the right can of electromagnet, you can create some interesting scupltures.

YouTube video showing ferrofluid art
Second YouTube video
Ferrofluid on Wikipedia

 
Celebaelin
244376.  Thu Dec 13, 2007 8:56 am Reply with quote

Fascinating as they are to watch there's something vaguely grotesque and disturbing about those videos. The fluid behaviour resembles that of slime moulds (like a co-operative amoeba of sorts).

 
ivor
250675.  Mon Dec 31, 2007 5:23 am Reply with quote

Ferrofluid is often used in loudspeakers. If you play it loud, such as many will be doing tonight, the "voice coil" of wound copper which moves in the magnetic field, becomes overheated and melts, causing sudden and permanent silence. Many manufacturers use ferrofluid, especially in tweeters; it stays in the magnet's gap because of the magnetic field, and helps dissipate heat from the voice coil, allowing for more and longer volume before that great and lasting silence...

 
THiNK TaNK
252571.  Fri Jan 04, 2008 8:36 pm Reply with quote

Ferrofluid like iron atomic symbol Fe fluid? The same iron that gives the Italian last name Ferrara the same sort of meaning as Smith?

 
Sergei
252643.  Sat Jan 05, 2008 5:43 am Reply with quote

Yes, ferro- is the prefix meaning "of iron", from Latin ferrum. It doesn't mean that Ferrofluids necessarily contain iron though. All substances that are affected by magnets are called "ferromagnetic" because iron was once the only known magnetic substance.

 
georgeabb
868362.  Sat Dec 03, 2011 6:55 pm Reply with quote

Just discovered ferrofluid - awesome stuff!
Makes beautiful sculptures!
Would love to see Alan's face if Stephen demo'ed this on Qi!

 

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