KARPEN PILE

[d3x0r]

Karpen's cell is an intermittant run thing... didn't it have a motor and a switch between two separate cells to allow a relaxation time?
Recently remembered electrets; which like magnets retain a permanent magnetic field, electrets retain a 'quasi-permanent' electric field... but if they're hooked into a circuit, they will instantly dissapate any charge they have, since they are also very high resistance/impedance.


https://www.youtube.com/watch?v=1DR-tTU8uIM
(This is the guy that was experiementing with dry-cells.. of various configurations)


and kinda disrelated; but entertaining; he made a wall of electroscopes   But the electroscope he used to measure the electret.
https://www.youtube.com/watch?v=iD6FW8MRUXk
Electrets are often high voltage ultra low current things...


Although.... capacitors are also made with electret-like materials in balances with normal capacitive materials...
https://www.youtube.com/watch?v=K1CjN2I7YeM


But, if they're put through an inductor, for instance, then they would get repolarized oppositely...
they are also referred to as ferroelectric  http://en.wikipedia.org/wiki/Ferroelectricity ; although 'electricity' is a misnomer really.


But; if such a cell could be made, it would have to be applied intermittently to a circuit, like a magnet... thereby requiring external physical work to make it do work...
http://en.wikipedia.org/wiki/Electrophorus  ; uses an electret to apply a charge to a capacitive plate that can then be applied to a circuit for instance...
I dunno...

[profitis]

Yes d3,all karpens are intermittent.a certain amount of time is required to reboot.it was about 1 or 2 seconds between gold and platinum in karpens motor.if you shortcircuit karpens battery for an hour it will need an hour to reboot.the nickel-MnO2-KOH-air karpen in the vid below gives some idea of time required between bursts for a tiny battery.a larger battery will work with much shorter delay

[pomodoro]

Of course pomodoro.do you think that a anodized carbon rod retains oxygen gas indefinitely? Impossible.the gas diffuses away,electrolyte wets surface.atomic O recombines into O2 and diffuses to where the pressure is alleviated.Its very small v anyway its not importante.leave it for an hour before measurement.

I agree but what does it have to do with the current setup?  A Pt electrode at same depth as the C electrode.  No pressure differential exists between them, thus emf is the same on both C and Pt, hence no voltage recorded on the voltmeter.
Do you not agree with this? 
From your previous post I understood that you meant that the Pt itself will have a different potential to the C when dipped in the electrolyte, not due to the oxygen/water reaction, but because of their different elemental makeup?

[profitis]

You can make a karpen with 2 Pt electrodes pomodoro,one blackened,one shiny,one on surface one below surface like I described near the beginning of this thread.you get a perpetual 50microamps/cm2 bursts like that.platinum will adsorb a different quantity of gas than C will straight from air and hence will have different v than C even if both submerged.elemental platinum voltage is different from C's voltage but you will hardly register it(picoamps).you can say that they have electrostatic voltage in this case and will effect O2 potentials via the NEMCA effect(google nemca pt o2)

[profitis]

If your Pt was a little higher above electrolyte you would get somewhat more disparity between electrodes pomodoro.if you add ammonium sulfate you will get still more disparity because then the electrolyte will wet surfaces