There are three ways I know of to do HVAC, actually. The arc method is the one most likely to produce undesirable nitrogen-based compounds, so I haven't tried it. Then there is the immersion method (both electrodes fully immersed), which according to Ol' Bob Berger is limited to producing maybe 5 or so ppm. Finally there's the cone method, in which one electrode is fully immersed and the other is placed just close enough to the surface of the water to raise it into a "cone" which envelopes the electrode when power is applied to the circuit. The cone method produces the most best result IMO, and is good for around 20 ppm, with more particulate content than is possible with LVDC. But you have to check on it every couple of hours, or as the water evaporates the cone will become an arc. Also the lid (I use a glass lid) has to be dried periodically, or you can get a corona discharge (diffuse version of arcing which is harder to detect). Personally, I use and recommend the HVAC cone method. But it does take caution and vigilance, so may not be for everyone. As for the ideal electrode sizes, I'm sure others here would know more about it than I. I seem to have hit on a combination that works and haven't experimented much with it.
-- indi On Sat, Aug 01, 2009 at 07:04:52PM -0500, Dan Nave wrote: > Aren't there two different approaches to the high voltage CS making? > > One uses an arc, producing more colloidal particles, and one uses the > electrodes further apart to produce ionic CS quickly with the high > voltage potential. > > Which one are you referring to? > > Dan > > On Fri, Jul 31, 2009 at 11:36 AM, Marshall Dudley<mdud...@king-cart.com> > wrote: > > For the high voltage generation of CS, you use very small electrodes, not > > large ones. You use large ones for low voltage CS. The trick it to get the > > high density of silver ions away from the electrode before they can > > aggregate sufficiently. For low voltage that is done by Browning movement > > and stirring, thus the very limited 1 mA per square inch. For high voltage > > systems, you want a huge gradient near the electrode, so that the ions are > > sucked away from the electrode by the electric field. I am not sure what > > size you would want for 500 volts, but for 10,000 volts I found that the > > electrodes should be about .03 square inch each. With the system I was > > using with 100 mA of current, that gave a density of about 3 amps per square > > inch. I am not sure 450 volts is enough to provide the necessary gradient > > to prevent larger particle size. The way I kept the electrode that small > > was to feed some 14 gauge silver wire into glass tubes, and only allow about > > 1/8 inch to protrude from the end under the water. Then I mounted it so > > that the tip of the two electrodes were about 1 inch apart. You may find > > that keeping it cool is a problem because of the high power. > > > > Marshall > > > > Pierre Genton wrote: > >> > >> Thanks for the warning about the cap. I made sure I discharged that > >> before going into the electronics too far. > >> > >> Yes, I heard that the microwave electronics produced pulsed DC. > >> At this stage I am looking for evidence of the system being able to > >> produce small enough particles before I have a large electrode fabricated > >> just for the purpose. Just seems I couldn't make a big enough electrode > >> practically to be able to make small particles but I don't really know. > >> > >> Boy sure would be good to make a fine quality CS this way since it is so > >> fast at a quart under 2 minutes . However safety and quality are the main > >> requirements for any system and product. > >> > >> Thanks for the tips and any other comments on this or other systems are > >> welcomed. > >> > > > -- > The Silver List is a moderated forum for discussing Colloidal Silver. > > Instructions for unsubscribing are posted at: http://silverlist.org > > To post, address your message to: silver-list@eskimo.com > > Address Off-Topic messages to: silver-off-topic-l...@eskimo.com > > The Silver List and Off Topic List archives are currently down... > > List maintainer: Mike Devour <mdev...@eskimo.com> > >
