[R B]

You have to altinate poles or else they will all shoot out of their hole

[R B]

Still brown when you centrifuge?

[R B]

Is the soloution opaque or translucent and drak brown tea? Like the magnetite pellets on your magnet and the soloution is transluent but coloured? or its just opaque and pellets aswell?

You might just need a better magnet, I got a 30x30x15mm n52 beast and it will clear the soloution now no worries. You will probably need to do the synthesis again or wash them until it goes clear and no yellow/brown colours and sonicate to disperse again because they go bad fast until coated.

Try centrifuging if you dont want to get a staunch magnet they are a bit wild and it almost works better for dense soloutions of magnetite.

[R B]

Do you guys degas the ddH2O? You will oxidize the magnetite with that many wash steps unless the water is fresh as.

My building is a million years old and the ddH2O is always a little acidic, It gets distilled into a massive tank and stands for a while before getting it out of the tap.
Plumbing is probably full of who knows what but I do have a Milli-Q machine available, but the pH is always quite low out of the Milli (~6.3) and drops over time as it takes on CO2 .

What do you make of the prospect of buffering the ddH20 with PBS or god forbid TRIS or just a degas? I ran out of time and was to lazy to refill my LN2 N2 generator but managed to save face with a drop of NaOH. But bumping it just above 7 might be a good idea.

 

 

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