How to Make Ferrofluid With Iron Oxide




About: Electrical Engineering and Radio Communications.

What is ferrofluid here is a link to Wikipedia on what it is.

I am going to show you 2 ways to make ferrofluid with iron oxide


Iron Oxide
Oil ( I used motor oil but most works)
Magnet (Preferably Strong)
Sealent or blue rtv


Step 1: Dry Ferrofluid

Put the iron oxide in a jar or test tube exc.

Step 2: Add Water

add water. fill to about the top

Step 3: Seal and Play

Seal the lid with a sealant i used Blue Rtv. Put a ring around the seal and put on lid. That's all your all done just bring your magnet near the side and watch as the iron oxide turns from a blob to a pokey blob.

Step 4: How to Make Ferrofluid With Oil

This is another way you can make ferrofluid using oil. First put some motor oil in a cup or dish.

Step 5: Add Iron Oxide

Add the iron oxide. If you want it to keep its shape after you move the magnet away make it thicker than i did.

Step 6: Enjoy

You can now play with your ferrofluid freely.

CAUTION it is extremely messy and should be treated accordingly.

This is my first instructable please leave constructive and helpful comments.
I will have pictures of it when a magnet is near soon.



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    6 Discussions


    2 years ago

    just thinking I might be completely wrong but wouldn't iron fillings be better as they are more magnetic

    3 replies

    Reply 2 years ago

    If they are more magnetic it would be nice but if it is chunky and doesn't mix well it wont work.

    Boiledcabbages ryan422

    Reply 2 years ago

    It's probably less chunky than iron oxide or at least in my experience you can also find it easily with a magnet in a bag and by dragging the magnet in the bag across a workshop floor.