Marshall said,
"When you increase the current density then the
concentration near the anode increases, increasing
aggregation, and if you don't stir, or if the water is
hot you have the same effect. If chunks were breaking
off then the size would be affected by the voltage,
not the current, and all our tests have confirmed that
it is current not voltage that effects particle size."
Your reasoning comes from low-voltage brewed CS. When
you use higher-voltage, as I do, the wires are too far
apart for this to be a consideration. My wires are
5-1/2" apart. ALL of the DW is between the wires, so
the concentration near the anode is the finished
product (15-20 ppm). If the size was affected by the
voltage, my CS would have very large particles, but in
fact I have almost no Tyndall. I get away with my
voltage because I have very low current. Whether it's
bigger particles breaking off the anode, or the silver
particles aggregating to themselves is not important.
I suspect you are correct about that being the
mechanism.
Terry Chamberlin
Ions and anions aggregate into particles when the concentration is
high. Concentration is highest near the electrodes.
Current controls how fast ions are released, voltage controls their
velocity. Stirring 'helps' disrupt the diffusion layer that's very close to
the electrodes. The diffusion layer could be seen like a crown running from
a burning building...lotsa people right near the doors, then the crowd
disburses getting thinned out just beyond the doors and progressively
thinner in the parking lot.
Too much heat and things collide before they get a chance to
de-concentrate. [Put a fire under the willy nilly stampede and you may find
people wearing each others clothing by the time they get clear, like,
Hey! That guy just danced right through my shorts, left his socks on my
head and we're both wearing the same pair of jeans.]
Perhaps high voltage more directly affects that diffusion layer by
sending ions speeding off quite fast.
As a matter of curiosity, how does one keep current low at high
voltages? Distance? Pulse width control?
..or is it low current 'density' from distance and very large electrodes?
Oh, re-reading...that's prolly it. ["All the water and 5 1/2 inches"]
Ode
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