Hi Nick. I was using a Kepco ATE75-3M, which was sufficient to see all effects with sodium salts. I haven't tried potassium salts yet, mainly due to time constraints. I'm surprised you need 120V to see the anodic reaction, I was seeing it at about 70V with the sodium salts. But voltage is misleading; electrode geometry and current density also play strong roles. I wonder what role dissolved H2 plays in the anodic reaction, if any? Maybe that's what causes those little explosions???
K. -----Original Message----- From: Nick Reiter [mailto:[EMAIL PROTECTED] Sent: Thursday, August 26, 2004 4:49 PM To: [EMAIL PROTECTED] Subject: RE: new mini-paper with Sam Faile, etc Hi Keith, The power supply I had used and still use for the "baseline" is/was a variable 0 to 40 VDC 3 amp supply. Not sure of the brand right off the bat - I can get that for you when I am back at my office tomorrow - and the reason I insert the past tense in the previous sentence is that a while back, the variable part gave up the ghost and the supply now puts out a steady 50VDC with very little loaded ripple. The current limiting part of the supply still works. I also have a Heathkit 0-500VDC 200mA supply and a Kepco 0-100V supply. I have played a bit more with applying anode potential to the small electrode. I can indeed see your point - I did get some reluctant and very spitty sizzly glow sheath at about 120V in KOH. At slightly lower potentials, I get a neat effect that is like little micro-concussions at the electrode, but no visible glow. Best, nr > BTW, the shape of the tip of the rod electrode > was very important for creating a smooth start, > try different shapes on a thicker specimen and > observe the end as you raise voltage. No surprise > there, but not obvious unless you use an electrode > thick enough to make a difference. A fine point > produces lower starting voltages, but with > substantial > variation in absolute value. > > Have you experimented with the anodic plasma > reaction? > > What power supply are you using? > > K. __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail
