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Home made super capacitors.

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ShawnLG

Wed Feb 24 2010, 08:41PM

Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
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Posts: 399

I have found a lengthy discussion on home made super capacitors.

hboy007

Wed Feb 24 2010, 11:02PM

Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
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this looks exciting and worth investigating! Thanks for the link, ShawnLG

IntraWinding

Thu Feb 25 2010, 01:43AM

Registered Member #2261 Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581

Great stuff! Very inspiring!

Conundrum

Fri Feb 26 2010, 08:49PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
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hmm... did anyone figure out a way to shred teflon tape?

i have a working blender purchased for another experiment so may be able to try this.

maybe improvise a ball grinder?

MinorityCarrier

Sat Feb 27 2010, 12:29AM

Registered Member #2123 Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312

I suspect teflon tape would tend to wind itself around spining parts and ball up.

I have sheets of polyolefin 'clean room paper' I could use as seperators and lots of PTFE 1/4" 3/8" & 1/2" tubing, courtesy of the semiconductor industry. I may have to buy a new blender and some "AC" to try this technology out (already have lampblack).

ShawnLG

Mon Mar 01 2010, 08:54PM

Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
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Posts: 399

I found something more inspiring. Someday these capacitors will power cars. I can't wait!

Conundrum

Mon Apr 05 2010, 01:16PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

heh.

has anyone tried using an old touchscreen or lcd screen as the backing?

just messing with conductive adhesives here, maybe one way to make a homebrew version would be graphite lubricating powder (sold for unsticking door locks etc) ground down with a mortar and pestle to reduce the grain size then mixed with a suitable binder such as RTV glue or "liquid electrical tape" and spread over a surface such as a piece of pcb stock.

EDIT:- As for shredding Teflon tape, what about using two nearly touching perforated flat metal sheets (think scaled down version of a kitchen grater) and a high speed oscillating motor? that ought to work.

As for larger capacitors, I wonder if stainless steel wire would work?
so the form would be SS wire-- AC--copypaper--AC--SS wire

then there's yet another approach, use conductive thread as one of the electrodes.
this is already fairly high surface area so it could work.

-A

GhostNull

Tue Apr 06 2010, 10:25AM

Registered Member #2648 Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291

Conundrum: with your home brew conductive adhesive idea, it has been done. I found an instructable here

While it works it has a pretty high resistence. I would try conductive siliver varnish it haven't used it but it seems to stick to thing pretty welll and have high conductivity, but it is a bit expensive, try make a homebrew version?

With conductive thread it has a pretty high resistence too, there might be a better alternative. I heard commericals use a nano textured conductive carbon surface but that might be a bit out of the hobbist league XD

And nice find ShawnLG!

Edit: sorry looks like conductive thread has a good conductivity

Conundrum

Sat Apr 10 2010, 05:17PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

Update:- went down to the pet shop (!) and got some powdered charcoal.
This is activated but because it is for pet use it may be purer than commercial AC or AC impregnated sheet from a cooker hood refill..

cost something like Â£3.71 for 250g

another idea is to get a flat plastic sheet from vacuum forming thermoplastic, and press the conductive thread into the surface.

Wax sheet would also work and make a convenient "blank".

-A

Proud Mary

Sat Apr 10 2010, 05:40PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Aquadag is a colloidal graphite paint sometimes used on both the inside and outside of CRTs.

I need some right now for coating the inside of a polyethylene cylinder for an ion chamber, but finding brand name Aquadag too expensive, I've sent off for some fine graphite powder and will try out several of the methods outlined in the patent literature for keeping it suspended in the liquid.

In this role it need only pass a few uA, so perhaps would be no use to you, but I recall RS used to sell a nickel screening spray, of reasonable conductance, and a great deal cheaper than those tiny bottles of silver-loaded paint.

You could also try fine aluminium powder in water soluble varnish, rather than go to the extravagance of Ag.

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