[EMS Discuss] Inkjet-printed circuits?

Wed Nov 13 11:56:49 PST 2013

Well, it turns out I misremembered and had artist's powder graphite, and
not proper lamp black. I did end up with a chunk of black polymorph that's
slightly conductive; probed resistance was some hundreds of kiloohms over a
distance of about a centimeter.  (I forgot my scale, so I'm not sure what
the exact proportions were.) There was some change to the resistance when
the plastic was flexed and released, so sensor and track potentiometer
applications are possible, but I don't think this formulation will work for
actual circuitry.

Next steps are probably getting finer carbon particles, and actually
weighing things.

Taper Wickel <EMAIL HIDDEN>
On Nov 13, 2013 7:56 AM, "Sam Foster" <EMAIL HIDDEN> wrote:

> How did the polymorph experiments work out last night, Taper? What kind of
> resistivity were you getting?
> We had only a little time to get Aidan's light finished (which we did, he
> was really pleased) so I wasn't able to track what you were doing there.
> /Sam
> On 11/12/2013 1:23 PM, Taper Wickel wrote:
>> Actually, they note that standard lubricating graphite does _not_ work
>> -- it's not conductive at all.
>> (I think the difference, based on very quick reading, is that lamp
>> black/carbon black is in a paracrystalline
>> form with electrons hanging out, and graphite is essentially sheets
>> that slide against each other without
>> electronic reactions.)
>> Taper.
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