If you have current limiting, then the current cannot go above this set value.
If you limit the current to a very small amount, it will take longer to get a particular
concentration (ppm) of CS for a particular size container, compared to a batch made with a higher
current limit setting.
The higher the current limit setting, the longer it will take for the reaction to reach the point of
the current limit. This is the reason for increasing the voltage, one reason for increasing the
electrode area, and the reason for moving the electrodes closer together. Any one of these three
changes will make the initial current higher and therefore the cell will reach the current limit
point faster. After reaching the current limit point, it will not be able to go any faster.
With very low currents like .2 and .3 ma, with the types of electrodes and spacing we usually use,
the current level is reached very quickly and there is no way to decrease the amount of time it
takes to make the CS without increasing the current limit value.
The best way to make the process go faster is to do any or all of these things but especially to
increase the current limit setting. You can also spike the initial distilled water with previously
made CS as well.
The electrode surface area determines how high a value you might want to use for a current limit.
Generally your stirring method will relate to how high a current level you will want to use. With
really good stirring, you can use much higher currents.
Any one of these methods involve certain tradeoffs.
Dan
bs clayton wrote:
Thanks for the reply. I was making a quart, and the
current varied a little bit between .2 and .3, it
seems to me the average was .23mA- I can't find my
production notes, just my calc, and that is what I
wrote in the formula. The electrodes are fine silver
wire 10 gauge, 5& 1/4 inches submerged, spacing is 2
inches. I am using a Frito bean dip can to hold the
light similar to what you described.
I think what I'm going to do next is use half of what
I made before, and fill it up with distilled water,
then crank it up to 1mA, see if it goes faster this
time- and what I end up with ppm-wise.
I read some discussion of particle size being related
to Tyndall effect, and when I started the Tyndall was
what I used to tell if it was ok. Now maybe that means
the particles are larger? Is there a consensus about
whether Tyndall is important in making this stuff? I
was trying to keep the particle size down, and the
other stuff to a minmum (silver oxides and like that).
Kathryn
________________________________________________________
Hi Kathryn.
I dont know if this got posted to the list or not so I
will repost.
Need more info. What size batch are we taking about?
What was the current .2-,3 or ,275 mA? What are you
using for Electrodes and what size. Whats the spacing
on the electrodes.
At .275 mA I would run the batch 24 hours per quart
with electrode spacing of 1.5 inch's using a total of
12 inch's of 12 gauge wire (6 inch's per electrode)..
If you take a peanut can , drill a one inch hole in
the top center and a one inch hole in the side, put
the light bulb in the hole in the side and the cs on
top, this will work good on a short glass jar. The
thermal stirring wont go above 5 inch's or so.
The batches I make = 50 ppm or so on the Faraday
calculations but some of the silver is left on the
electrodes or on the glass container. The cs stays
clear most of the time.
Faraday calculations work but their are many of other
factors involved to produce a good CS. Stirring is
very important as is current control per sq inch of
electrodes. Ode from silver puppy sells a magnetic
stirrer of which has solved many of my problems,
I have used very low current before with somewhat good
results. I prefer to use 1 mA of current per 12 inch's
of 12 or 14 gauge wire or .5mA per square inch of
total wet electrodes.
Hope this helps.
Sam L.
On 12/7/06, bs clayton <[email protected]> wrote:
I am looking for some input on this new batch I did. I
changed 2 of the parameters, adding a light bulb under
the jar as a thermal stirrer, and I lowered the
current to .2-.3 mA.
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