Richard Goodwin wrote:
I was thinking high voltage AC, like 10-15 kv.
Perhaps the 60 hz ac doesn't work well because it switch so fast, it
doesn't give the silver particles time to separate far enough from
their electrodes, and they plate right back onto them in the reverse
cycle?
Yes that is the reason unless the voltages are high enough to get them
away from the layer which basically does not move with convection.
If that is the case, then better stirring, or flowing of the water
might help.
It helps if the frequency is not too high for the voltage. But it does
little if the ions don't have time to move out of the layer of water
next to the electrode which hardly moves with stirring.
I haven't tried ac yet, but will as soon as I can get a transformer.
I keep missing them on ebay. :-)
Go to a sign company that does neon signs. They replace signs and
usually have a bunch of old used transformers that they will give you
for free. 15,000 is best, but 12,000 will work. Remember that these
transformers name plate voltage is around 50% over the full load voltage.
I use DC now -- high voltage to start a fresh batch, and gradually
lower it to limit the current. Electrophoresis power supplies are
readily available on ebay. Switching polarity makes them work much
better. So one question would be: what is the optimum switching rate?
For what voltage? The rate is proportional to the voltage.
Marshall
Dick
------------------------------------------------------------------------
*From:* Alchemysa <da...@alchemysa.com.au>
*To:* silver-list@eskimo.com
*Sent:* Fri, December 11, 2009 6:48:52 PM
*Subject:* CS>Re: ac or dc?
Genuine low voltage AC doesn't work at all. (i.e. a low voltage
50/60hz. AC wall adaptor). There a few low voltage AC adaptors around
so don't mistakenly try to use one.
It has to be DC (or DC with polarity swapping).
David
>
> From: Richard Goodwin <dickgoodwin2...@yahoo.com
<mailto:dickgoodwin2...@yahoo.com>>
> Date: 12 December 2009 4:49:46 AM
> To: silver-list@eskimo.com <mailto:silver-list@eskimo.com>
> Subject: CS>ac or dc?
>
>
> Which do you think works better for making EIS, DC that you have to
switch polarity on every minute or so, or AC, assuming everything else
is equal?
>
> Dick
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