Electromagnetic Capper

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1

Hi all,

We are trying to replicate the electromagnet capper developed by [2601.07043] PANDA-film: an automated system for electrodeposition of polymer thin films and their wetting analysis (On Opentrons instead). We faced an issue with metal discs (for vial caps). We decided to use smaller discs (5/8 in.) for smaller vials, but we saw that the iron disks do not attach at the center of the electromagnet but instead slide toward the edges. It seems that the regions with the highest magnetic field gradient are at the edges.

Has anyone had a similar experience with this? Has anyone tried using smaller electromagnets?

Sina

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Any videos or pictures you could share?

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We’ve only tried that magnet/disc. Conceptually, using smaller discs and a smaller electromagnet makes a lot of sense. There is a small concern that the force wouldn’t be strong enough, but you’d have to try it out.