Hellow, friends,
As you remember, with the help of many of you I have learned how to make a
very decent EIS, but I still have questions to ask in order to keep
improving.
The latest "provisional" setup I am using consists in the following:
A cylindrical glass flower pot 20 cm high, 10 cm in diameter, which holds
1350 ml
A plastic disk covering the container, with two sets of two holes, distance
between holes 25mm, distance between sets 45 mm, drilled to accomodate two
9999 10ga silver wire electrodes, 262mm long each, bent in a long "U", the
tips coming out of the holes, one tip in each used to clamp the alligator
clips coming out of the circuit (built with the help of list members and
with some home made additions), which results in two "U" form electrodes
with 25 mm separation between legs, 45 mm distance between electrodes,
immersed 232 mm in water.
The power source is a 24 V DC output computer transformer.
Procedure:
I use 250 ml of previous EIS batch, usually averaging 16 ppm according to
Faraday equation. Add 1100 ml of bi-distilled, filtered, de-ionised water
which has a conductivity of 0.2-0.25 mA.
Example of readings every hour from last batch, no stirring at all:
9.6V-0.4mA
8.9V-0.4mA
8.1V-0.4mA
7.3V-0.5mA
6.6V-0.55mA
6.0V-0.6mA
At this moment I stoppped a few seconds in order to clean
cathode´s mild accumulation of silver oxide w/ paper towel.
5.3V-0.7mA
4.9V-0.7mA
4.4V-0.7mA
4.2V-0.75mA
3.9V-0.75mA
Clean cathode again.
I prefer to take a longer time in order to maintain the process at a maximum
of 0.75mA, since I understand this way I get smaller colloidal particles
produced.
According to the Faraday Equation, I got 16.5 ppm after 10 hours. I can
reach above 20 ppm within the same 0.75 mA if I need it just letting the
process go two hours longer.
Here are my questions:
There is not any hydrogen bubbling produced at the cathode. Where does the
hydrogen go?
Do I still need stirring in this setup?
The EIS produced is cristal clear, no yellow hue even after months,
practically invisible Tyndall effect, no residues at bottom of jar,
occasionally 3 or 4 tiny white specs floating that I remove at the end.
What am I getting in my EIS? What are the approximate proportions of
ionic/colloidal silver?
If I don´t clean the cathode, dark grey beard-like fuzzies naturally build
at the lowest part of it towards the end of process and I get two or three
little pools of mirror-looking silver floating on top.
Thanks again for your help!!
Carlos
From: Ode Coyote <odecoy...@alltel.net>
Reply-To: silver-list@eskimo.com
To: silver-list@eskimo.com
Subject: Re: CS>Voltage
Date: Tue, 10 Jul 2007 09:26:24 -0400
Voltage is irrelevant.
Any voltage over 1.2 will do.
"Current density", the ratio of current drawn through your changing
conductivity in the water to surface area of the electrode is important to
keep the Nernst Diffusion layer from over loading.
Current draw can be controlled by gradually increasing distance between
electrodes, or by using a constant current circuit that drops the voltage
as the conductivity goes up.
It's all about Ohms law.
A 20K series resistor with a 24 volt power source works ...OK.
ode
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