It very interesting chemistry isn't it. This type of technique is not only restricted to copper. I do a prac with my final year chem students which involves wrapping iron ion's up in oleic acid. The ions are then miscible in non-polar solvents and can easily be dissolved into kero. This stuff is called ferro fluid and does wonderful things when in the presence of a magnetic field. The kids love the stuff .
Ferro fluid is pretty cool, was used in top-end audio tweeters for a while.
Saw a video years ago of someone playing with it in magnetic fields, sure there would be something on youtube.
There are a few vids up there. You can buy the stuff but it costs about $1 per mL. It's dead easy to make and last time we did it we made about 2L of the stuff. Didn't cost anywhere near 2k in materials .
Mark
Quote:
Originally Posted by MrB
Ferro fluid is pretty cool, was used in top-end audio tweeters for a while.
Saw a video years ago of someone playing with it in magnetic fields, sure there would be something on youtube.
Sounds like interesting stuff. I'd like to see it Marko.
When I was a pre-teenager a pharmacy student showed me how to float a steel sewing needle on water. Its done by maintaining the surface tension of the water intact.
On observing the floating needle there is a depression on the water surface where the needle floats.
Sounds like interesting stuff. I'd like to see it Marko.
When I was a pre-teenager a pharmacy student showed me how to float a steel sewing needle on water. Its done by maintaining the surface tension of the water intact.
On observing the floating needle there is a depression on the water surface where the needle floats.
Sounds like interesting stuff. I'd like to see it Marko.
When I was a pre-teenager a pharmacy student showed me how to float a steel sewing needle on water. Its done by maintaining the surface tension of the water intact.
On observing the floating needle there is a depression on the water surface where the needle floats.
More Interesting Science
. This type of technique is not only restricted to copper. I do a prac with my final year chem students which involves wrapping iron ion's up in oleic acid. The ions are then miscible in non-polar solvents and can easily be dissolved into kero. This stuff is called ferro fluid and does wonderful things when in the presence of a magnetic field. The kids love the stuff 
.
