Production Techniques and Chemistry > Colloidal Silver Production
Requesting help.
cfnisbet:
Normal. Electrodes undergoing electrolysis split water into oxygen and hydrogen as well as the silver oxide creation process. You are just seeing microscopic oxygen and hydrogen bubbles.
indocomp:
Great, thank you for the explanation
I though i saw too high current, too high voltage or probably worst wrong polarity
Anyway small wire (25 gauge ) need longer rod sink under the water surface to get same 13.5 mA compare with 12 gauge
but longer wire means more water split like my video, and from what i read thats a better way of processing it right?
A post inside one of the articles said the smaller the wire the better
Just to be sure
Thanks
kephra:
--- Quote ---I have seen very tiny small bubbles fogs smokes rapidly coming out from the cathode going towards anode, this is normal right??
--- End quote ---
Yes normal.
The bubbles are pure hydrogen caused by the reduction of sodium hydroxide at the cathode.
The sodium instantly reacts with water giving off Hydrogen.
2Na + 2H2O --> 2NaOH +H2
Gene:
The "smoke" that you read about, if you shine a light through the cell and see long wispy "arms" of cloudy solution (a.k.a. "smoke" by analogy) coming off the anode where they kind of linger or meander around some, you need to drop the current you're running at as its too high for the surface area of the anode you're using.
What you're seeing is silver oxide being pushed off the anode that has yet to dissolve because its being produced too quickly by too high a current. It may dissolve, it may not but seeing this, you're either borderline or over the wire and really need to back things down until you stop seeing it and then back off another milliamp or two or three for some wiggle room.
The bubbles around the cathode are normal, expected and what you WANT to see.
Anode "smoke"? NOT!
Sometimes I see it but then look closely and find that there's a lot of bubbles attached to the anode wire (no clue why because they weren't there right before I started up the cell) which are effectively limiting the surface area on the wire in contact with the water where just tapping the connection to the wire outside the cell creates enough mechanical vibration to knock them all off and everything returns to normal and this doesn't happen again during the run. This doesn't happen often but I have seen it more than once and am still perplexed as to whats causing it and why. No, I'm not stirring - just letting the convection current in the water from the container being bottom heated, keeping the water at 150F, to keep things in motion.
indocomp:
Hi I follow instruction on this forum for 160 ppm which is
2 grams of gelatine soak and heated until its clear again
0,5 ml of 50:50 karo vodka diluted
1ml sodium carbonate solution
1000ml dw
heated to around 75 degree and start the process
I follow Gene method using 7,5 mA and i am using 6 Square inch bar so i dont need to fire clean my anode
Why after 5 minutes the colour already start to change to yellow
and after 10 minutes it started getting dark tea colour , and when the process move forward the result get darker and darker
I dont think the is turbidity because the when i use my mobile phone through it, the clarity looks fine
Too little current or too much reducer or too much capping agent ? or too hot ?
Please help
thank you
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