[NewCandle] Measuring Half-Cell Charge

[Keith Nagel]

Hey Fred,

As regards the electrolyte, you get the best results with the
H+ ion, but that'll corrode your copper. Supercaps typically
use dilute sulfuric acid. 

The challenge with the carbon is twofold; getting good ohmic contact
between the carbon and the metal ( easy if you use nickel or SS ) and getting good
ohmic contact between the carbon particles themselves ( _not_ easy ).
I used films of fine carbon powder under mechanical pressure.
A tube would make it relatively easy to compress the carbon,
a sphere not so easy. You can get a good idea how
well things are going by using an insulating tube and conductive
endcaps, and measuring the resistance dry as you compress it.
Using coarse granules, you can only get so far with compression.

The danger of poor contact would be islands of neutral carbon
inside the body of the capacitor.

BTW, no offense to those fellows across the pond that you linked,
but isn't the green found on copper statues copper carbonate? Copper
oxides are black and red, and are conductive to some degree...

K.

-----Original Message-----
From: newcandle-bounces at ipdiscover.com
[mailto:newcandle-bounces at ipdiscover.com]On Behalf Of Frederick Sparber
Sent: Saturday, September 08, 2007 4:38 AM
To: New energy for the new world.
Subject: [NewCandle] Measuring Half-Cell Charge


Hi Keith, you wrote:

" I would suggest a stainless steel pipe rather than the copper float;
if you are using coarse carbon there is no need to pack it with
a ram, but you do need good electrical contact with the pipe
and copper oxide is poor in that regard. Some kind of
pressure on the carbon stack will greatly reduce the ohmic
resistance and improve the circuit also. It might be hard
to pack the copper float properly because of the shape."

K.

I'm well stocked on vinergar and salt and a copper float, but no
stainless steel.

If only I could stuff a balloon into the float and inflate it.  :-)

http://www.chem.umn.edu/outreach/Card-SaltVinCopper.html

Fred

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