Graphite-Paper - Aluminium-Foil galvanic cell with 1.7 to 1.92 Volts

[hartiberlin]

As the binder material for the lampblack you can use some kind
of acrylic binder like this:

http://www.gerstaecker.de/GERSTAECKER%20Acrylbinder-bindemittel-zubehor.htm

or something like this:

http://www.artmaxxberlin.de/html/artmaxx-acryl-pigment-binder.html


For the Lampblack I have been using Guardi colors,
see here:

http://www.boesner.com/boesner/servlet/frontend/articleDetail.html?btUid=bt_Article&iDf_id=c0a81c5:f243d1:fe6ba05c4f:-1971&iDf_locale=de_DE&iDf_recordDeleted=0&iDf_relayClientId=1

You need to choose the color selector and the choose Lampenruß which mean Lampblack.

Hope this helps.

Regards, Stefan.

[hartiberlin]

Here is a picture of these painter pigments
and they also have lampblack.
But I don´t find a picture of it right now, but it comes in the same bottles.

Hope this helps.

Regards, Stefan.

[Pirate88179]

Stefan:

So would that be pure, or almost pure, fine carbon powder?  Or are there binders and other stuff in there as well?  Powdered graphite found in hardware stores to lubricate locks is pretty pure as far as I know.  And cheap as well.

It is easy to make lampblack like Edison did for his experiments.  He just put a piece of metal over a candle and took the powder that gathered there.  This might be a bit time consuming to get a decent quantity but, you could have several candles and plates going at the same time.  Just a thought.  This would be something almost everyone in the world could do without special materials or suppliers. (Like those of my graphite powder for locks) Candles are pretty readily accessible all over the world.

Bill

[stephenafreter]

Well, after reflexion I think it's a good solution for emergency purpose.

But for third world power supply I am very worried to imagine thousands or more people throwing daily their aluminium oxide/hydroxide in the environment !!

For example if I bring the concept to the Mekong delta, where people have no light in their houses, it would be a cheap solution, but they would throw the electrolyte in the nature ...
I was thinking of the millions of people living in house boats in Vietnam and Cambodia, among the poorest people I have seen in Asia.

[hartiberlin]

Hi Bill,
yes, you can get it from candles.
But you really have to check the resistance of the powder.

Mine bought from the painter´s brand "guardi"
has a resistance of around 30 to 50 Ohms when you put a
Ohmmeter directly into the powder and have the probe tips
around 2 to 5 millimeters away from each other.

This is a very good nice low value and if you
try it with other graphite powder, just let me know,
which one has the lowest electrical resistance.

We need to find the best carbon based powder, that has
the lowest electrical resistance.

Charcoal is very very poor in electrical resitance and
my guardi lampblack had the lowest resistance I have found so far,
so I use this one.

My bought real graphite powder , which I bought from
Ebay had more resistance and was more expensive.

To generate your own lampblack from burning candles
it would be preferred to really heat the black powder then really
hot, as only a really hot temperature will
produce conductive lampblack, lower temperature will
NOT make the lampblack conductive, so you really need hot flames !

Another good conductive graphite type is:
Russverkollerung or Rebenscharz.

See:

http://www.schmincke.de/fileadmin/downloads/Farbkarten_Pigmente2.pdf

and scroll down to productnumber 18 722 :

Rußverkollerung
nearly pure amorphous carbon
of vegetable origin

This is more thick and weights more than their lampblack,
but has a slightly
lower electrical conduction.

I have not tested yet their real Graphit,
which is also listed there as product number 18720

Hope this helps.

Regards, Stefan.

Stefan:

So would that be pure, or almost pure, fine carbon powder?  Or are there binders and other stuff in there as well?  Powdered graphite found in hardware stores to lubricate locks is pretty pure as far as I know.  And cheap as well.

It is easy to make lampblack like Edison did for his experiments.  He just put a piece of metal over a candle and took the powder that gathered there.  This might be a bit time consuming to get a decent quantity but, you could have several candles and plates going at the same time.  Just a thought.  This would be something almost everyone in the world could do without special materials or suppliers. (Like those of my graphite powder for locks) Candles are pretty readily accessible all over the world.

Bill