Quote:
Originally Posted by knc1
New record, 4 seconds.
Those still waiting for their Hydrogen peroxide - you can stop waiting, you don't need it.
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All of the explanations so far in my document have been based on the basics of Copper chemistry.
Quote: "Copper is non-reactive with acids."
Which is true enough, but consider the only things present (by intent) in the 4 second etch solution is:
Copper, Hydrochloric acid, Acetic acid, and water.
So, as far as the basics go, that "Can not work (tm)."
Yet it does, it works the fastest of any solutions tried.
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I think that the key to what is happening was published by Dennis W. Hess in 2001, see:
http://www.researchgate.net/publicat...ng_Acetic_Acid
You can read in the abstract his description of what happens when Copper is cleaned with a weak solution of Acetic acid followed by allowing to dry (in dry nitrogen - away from oxygen and moisture)
VS
being rinsed in de-ionized water.
I.E:
Quote:
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a surface film of cupric hydroxide forms immediately
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Ah, so -
Acids most definitely react with cupric hydroxide!
Which may indeed be the key to what is happening.
Now, back to the kitchen, see if I can cook up an explanation.
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Note:
Dr. Hess was using X-ray photoelectron spectroscopy for his determinations.
My kitchen isn't equipped that well, but I'll think of something.
#8,000