Step 4: Collect ferric oxide

Collecting ferric oxide:
Get a magnet. Roll it with paper or plastic bag (it is needed to separate ferric oxide from a magnet easily). Collect all your Fe2O3. Let ir dry.

Repeat step 3:
If not all oxide has separated from a tape you can repeat procedure with acetone few time to get a better effect.
Could you be a little more specific on how you "magnetize" the ferrofluid, I'm a little confused at this point. Also, why does size matter and not strength for magnetizing it?
bigger magnets make bigger fields ..and are usually stronger out of size im guessing.
another good substance is to ask mates or uni ("borrow") finished toner cartridges! there is still always at leased a table spoon of toner powder left in them!! (toner is a magnetic ink) mix this into the substance too. it adds to the effect really well. !! dont make it too weak cause it just flops about after the magnet then !!
i didn't know that regular toner cartriges use magnetic ink a.k.a. toner...<br /> i thought that a special toner is used for that one...<br />
<p>It isn't just any toner, it has to be MICR (Magnetic Ink Character Recognition), which is used on checks. You can get a refill bottle for fairly cheap on ebay, and some even come with gloves and an extra top with a &quot;funnel&quot;</p><p>200g MICR Refill with gloves and extra top- <a href="http://www.ebay.com/itm/MICR-200g-Toner-Refill-Kit-for-HP-Q2612A-LaserJet-1010-1012-1018-1020-N-NW-3015-/180853046493?pt=LH_DefaultDomain_0&hash=item2a1bae7cdd" rel="nofollow">http://www.ebay.com/itm/MICR-200g-Toner-Refill-Kit...</a></p><p>This next link has four bottles of different colored MICR Toner, and I'm not completely sure, but this might change the ferrofluid color as long as you use a clear or lightly colored oil (vegetable oil, maybe Canola oil, etc.)- <a href="http://www.ebay.com/itm/MICR-2-times-4-Toner-Refill-for-Samsung-Xpress-SL-C1810W-SL-C1860FW-READ-/221695958535?pt=LH_DefaultDomain_0&hash=item339e1bde07" rel="nofollow">http://www.ebay.com/itm/MICR-2-times-4-Toner-Refil...</a></p>
Me neither , Are you sure that toner is megnetic ? I thught it was som kind of organic. Anyway iron must be just a part of the compound
Yea, there was popular instructable about that. :)
ok the way he made the ferrofluid is by putting amagnet underneath thats what he means by "magnatize" and you do want a strong magnet but you also want one that covers a big surface area so you get a big affect Cheers
<p>BTW, </p><p>http://makezine.com/2014/10/07/diy-ferrofluid/</p>
<p>Nail polish remover is acetone, its pretty benign. However there are a couple issues here first Fe2O3 is red rust, FeO is black. The black FeO is generally whats in ferrofluid but its expensive hence the tapes (great idea). I have been trying VHS instead of cassette (more FeO) but acetone is not eating the plastic. I could purchase some solvent like DMSO but i might as well just buy the FeO then. I tried gasoline no luck, wondering if there is some type of coating on the tapes that needs to be stripped (can't reason why it would be impervious to gasoline) but I was thinking of pre treating in bleach then back in gasoline. Anyone have any experience pulling this stuff from VHS? Maybe the gasoline is just super slow so I could heat it but I am not crazy about that idea for obvious reasons. Any assistance internet? </p>
<p>Could I use nail polish remover instead of acetone?</p>
1)Burn Steel Wool 2)Put in water 3) Wait a couple of days. All the FeOx will turn to powder. 4)Separate the magnetite with a magnet. The trick with ferro fluid is to have very fine powder so it make a suspension called a "colloid". The medium is usually a mixture of oil and kerosene. Maybe if you put the magnetite in a tubler you will get very fine powder.
Thanks I will try to get steel wool and if this will work i involve this to my instructable (with your name of course).
Did I say a couple of days...I meant a couple of weeks. I don't understand the process but burned steel wool maintain its integrity and doesn't fall apart. After soaking in water for a couple of weeks, red rust will appear and the burned steel wool falls apart. I hope someone can explain this and suggest a faster process.
i would use one of those fish tank bubblers, so it touches more oxygen... so it oxidizes. or one of those hydroponics air stones... in any case, just get more air on it, and it should rust faster... right?
<p>Nope....<strong>H2O has <em>more</em> O (30%)</strong> than &quot;air&quot; which is 78% nitrogen and <strong><em>only </em>21% oxygen</strong>, with traces of water vapor (which has more O than the air it is in! lol!), carbon dioxide/monoxide, argon, ozone and various other trace components, this is why wet iron rusts faster than dry iron exposed only to air.</p><p>Just a little common sense applied to a lot of old Star Trek episodes reiterating the percentages of atmospheric gasses in the many &quot;class M planets&quot; (human breathable without respirator assistance) they came across in their &quot;Treks&quot; and putting together the obvious components of water being<strong> 2 hydrogen molecules to 1 oxygen, making it 66% H to 33% O</strong> rounded down to whole numbers.</p><p>However, this is not to say your suggestion is completely without merit, since stirring or agitating the water will expedite the oxidation process for replenishing new O molecules as they combine with the fe molecules.</p><p>But the way to <strong><em>REALLY</em> increase the rate is<em> CAREFULLY</em> </strong>using an <strong>OXIDIZER,</strong> which is anything with the &quot;oxidizer&quot; logo on it, but I would limit that to adding only <strong>Hydrogen Peroxide </strong>(if you look at it, it tells you what it is,<strong> <em>one</em> hydrogen <em>per</em> oxygen</strong>, or 1 H for each 1 O making this <strong>50% oxygen</strong> <strong><em>instead</em></strong> of the <strong>30% that water has</strong>, and when this reacts with the iron, it will release only oxygen gas, and leave plain water as the byproduct, much safer than the other most common oxidizer found in a household... that I <strong>suggest to <em>avoid all together</em> </strong>which is....<strong>bleach</strong>..., because that <strong>releases chlorine gas</strong> which is <em><strong>poisonous/toxic</strong></em>!</p><p>Peace, Love, and Light!</p>
I think it will only work in theory.
well, the reaction slows down when there is less dissolved O2, cuz O in FeO is oxygen, and where will the iron get the oxygen from oxygen-depleted water? flio has a point there...<br />
you can add vinegar to speed up the rusting to a couple hours
oh crap i forgot you have to mix bleach and vinegar and put steel wool in and it rusts the whole piece in a couple hours then filter the rust out with a coffee filter
hot hydrogen perxiod will work faster than water its not nearly as mole stable as water is. as for the steel wool get the super fine type ,dont burn it with fire use a 9 volt battery as fire will give bad contaminants .next week how to centrifuge right guard for the alu oxide
You take steel wool, put a 9-volt to it, and then when the core is glowing red, drop into a bucket of water. this gave me results in 2 nights.
I burned the steel wool over the stove. it took a while to get it all burned. And i had to blow at it. Is the 9 volt battery faster? When the core is glowing red is it transient or does the 9 volt battery maintain a current and glows red for a while? I will have to try it. Thanks.
Basically, you just touch the battery to it and it starts to burn. Then you take the battery away and it keeps burning. If you want it to go faster, you have to blow at it still. Sometimes you will get Fe2O3, sometimes Fe3O4. What do you mean by transient?
that's what I usually do, but it takes two week for the steel wool to disintegrates. It must be the water.
after the steel wool is cooled down, take it out of the water and leave it in the sun.
burn steal wool with a 9 volt?
Fe2O3 is red rust. Fe3O4 is the thing you made, great i'ble still
You can't make nanoparticles out of casette tapes, sorry. <br>It's neat, but it's not true ferrofluid, it's some kind of ferrite suspension, but you can do something this with rust/iron filings and oil (and a really strong magnet).
Oh - but you can make it though (but expect some nasty nasty fumes) www.sci-spot.com/Chemistry/liqimag.htm
<p>This is the method I use, but use half the amount of kerosene or else too watery and wont spike.</p>
<p>I've seen commentators on other projects note that cooking oil will go rancid after some time and recommend mineral oil. That's what I'm going to try today, hope it works! And thanks for the great write up, I never would of though of covering the magnet with plastic.</p>
<p>Hi, I started this method with a VHS. Then while the tape was in the acetone, I read the comments and saw that it doesn't work with VHS.</p><p>So I thrown the video tape in my BBQ and put it on fire because I was very angry.</p><p>I've lost a part of my arm hair...</p><p>Then I took the ashes and realised it could still work with it.</p><p>And it worked :D</p>
how much ferrofluid can you make with one video tape?
This does look easy. But I'm not sure I'd call $200 per cup a "very low price" when a $60 per cup result tops a Google search for "buy ferrofluid". Does this instructable produce better quality stuff? To whatnot: The dish soap is the surfactant and also emulsifies the oil and water. Apparently you can make magnetite more soluble in oil or kerosene using oleic acid, or more soluble in water with citric acid. I'm also reading a journal abstract here where they got crazy and dissolved in water particles made of magnetite+styrofoam, coated with oleic acid, surrounded by oil, coated with dodecyl sulfate.
You can buy it for about &Acirc;&pound;10 per 30ml on ebay
Good comment , compliments.
yes, it is cheap, but you forgot onne thing, Delivery price. Maybe it is no big deal if you live in the US, but change the setting to the philippines, it's a different story...<br />
he he ;D This is one of my first instructables, actually it is way better to buy thing if your point is quality. ;) I made better one "Real" ferrofluid so this is very simple and basic version. But still pretty cool ;)
I tried same thing but burned the tapes .. I got a lot of ferrite fluid but quality was low - Couldn't get any shape like you show in the beginning . you sure this is fluid you made this way ?
good idea, greae use for all those dead floppy disks and cassette tapes! can also use mentholated spirits. should work. it is abit less evil on your head + less flammable. also dissolves in water dont know if acetone does if that helps at all. im off to pilfer old video tape now!
Acetone seems to have failed to dissolve video tapes for me. Did 'mentholated spirits' work for you? If so, what are they and where can I get them? Thanks.
Acetone failed to dissolve my viideos too. I kept tapes in acetone a night long and nothing happened. Tapes were all of the same set. Acetone was clear , no iron oxide dust appeared, I guess tapes differ in some kind of wear protection. I' ll try with some other different set of cassettes. I tried to add nitro paint diluent but nothing happened. What about gasoline ?. Anyway I got rid of that junk at last. <br>What about tumbling mineral magnetite in a pop bottle with little round quartz stones. Quartz stones are free and harder than black magnetite that is free also.. You can collect nagnetite in many river sands using an magnet. That's just a last minute idea , I didn't try to tumble magnetite jet.
At your local bar xD

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