Re: [DIYbio] diy magnetic plate for DNA purification?

On 12/23/2014 11:19 AM, Jeswin wrote:
> Does the orientation matter?

Yes, in my design it does. So you are not thinking
of ring magnets, but flat slabs? Not sure how to interpret your ascii text art sketch.

My sketch is about using small, maybe 1mm X 1mm X 2mm lengthwise polarized inexpensive magnets, with orientations
as in the sketch. Orientation matters to keep from having beads string across a well
bottom.


For your idea of just one magnet between four wells, orientation should not matter,
except probably better all up or all down -- a blob will form
at edge of disc as fields wrap around to other side to concentrate themsleves in the beads.
(Fields concentrating in susceptible media is a potential energy lowering state that explains
the force holding beads together.)

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