uzaymaymunu - 20-1-2013 at 08:34
i've made ferrofluid from Fe3O4, kerocene, and (as a surfactant) oleic acid.
First product-
http://www.youtube.com/watch?v=2C_IRXS-aPU
Second product-
<iframe sandbox width="560" height="315" src="http://www.youtube.com/embed/On6BoY_8qic" frameborder="0" allowfullscreen></iframe>
[Edited on 20-1-2013 by uzaymaymunu]
blogfast25 - 20-1-2013 at 11:12
Good job. Homemade ferrofluid that 'porcupines' isn't that easy to make...
Boron Trioxide - 20-1-2013 at 14:11
Great looking ferrofluid though I was wondering, does it conduct electricity, because the particles of Fe3O4 should conduct electricity, however they
are dispersed very finely? Or possibly would it conduct just from the oleic acid.
Also what process did you use to make the Fe3O4?
12AX7 - 20-1-2013 at 14:51
hmm, I wouldn't think it would conduct -- the particles are coated in surfactant, or at least, are supposed to be. Occurs to me I've never seen it
tested 
Tim
Darkblade48 - 20-1-2013 at 15:40
Very nice; perhaps you could do a write up of your process?
Are you using standard NdFeB magnets?
uzaymaymunu - 21-1-2013 at 11:40
Thanks guys
1- I did not measure electrical conductivity but i think it is not. Because Fe3O4 particles forming micelles with oleic acid. And this structure is
really big to going anode and cathode. And Fe3O4 is ionic compound but it is not an ion.
check "mobility" from electrochemistry.
2- process: titrating FeCl2/FeCl3 mixture with then add soap (ammonium oleate) and heat. Finally add kerocene.
3- I think magnet is not very important. Because i can see spikes with speaker magnet.
4- if you want to get spikes you should try many times; yes it is not easy i think.
Morgan - 24-1-2013 at 22:31
"Electrically conductive ferrofluid compositions and method of preparing and ..."
http://www.google.com/patents/US4604229