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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
thanks for the tips Proud Mary.
I did also discover that conductive thread finely shredded also works.
Also obtained some very fine colloidal carbon originally for treating cooker hoods (sets with heat), will have a dig and see what i can find in the Junk Drawer of Doom :)
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
Conductive Coatings:
I have about 100ml of Aquadag I got from Timstar years ago, marked 'graphite colloidal about 18% solids', but they don't appear to do chemicals any more. Smells faintly of ammonia and needs a good shake before use.
What about this stuff? Elvamide (10^10 to 10^12 ohms per unit square. I can't judge surface conductivity, but that sounds rather high compared to the nickel spray). It's apparently used as the conductive layer on electrostatic speakers
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
IntraWinding wrote ...
Conductive Coatings...
What about this stuff? Elvamide (10^10 to 10^12 ohms per unit square. I can't judge surface conductivity, but that sounds rather high compared to the nickel spray). It's apparently used as the conductive layer on electrostatic speakers
DuPont have a detailed data and application blurb for Elvamide, and it doesn't seem to mention it being a conductive polymer anywhere:
But they do make a conductive nylon resin called Zytel:
The RS conductive nickel spray paint wouldn't do for my ion chamber application, because of the high density of Ni compared to C, not to mention the Ni absorption edge getting in the way.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
hey there Proud Mary. I have a cunning idea. If you email me your address I can send you a sample of all the conductive glues I have available.
I have two different types of RTV adhesive, graphite powder, conductive thread, ultra fine steel wire, conductive fabric (free sample), EMC packing for RAM, elastomer rubber strips, Shapelock, glow powder etc.
'Tis only fair, as I did get some goodies from you.. :)
EDIT:- I also came up with the deviously cunning idea of salvaging the coating from a defunct up to air CRT. to do this you require some sort of solvent and a suitable container resistant to it.
EDIT 2:- another way is to make colloidal silver and dry it. See for how. Or you could buy it but why bother when its trivial to make?
Oh, and I also discovered that if you have any "dead" bottles of silver paint the remaining (useful) coating can be salvaged easily using nothing more complicated than nail polish remover and a bit of agitation. Dry this off carefully on a surface and then scrape off paint into a suitable container for mixing with the graphite and RTV tyre repair compound.
Note, they just changed the packet so you may need to be careful. It "looks" identical but i need to test it first)
Another interesting idea is to purchase a spare resistive touchscreen (busted e-readers, DS's, phones and POS machines come to mind) and "harvest" the perfectly good front plastic sheet and rear glass if it isn't too badly smashed.. Bit of gentle butchery with a glass cutter and gloves (watch those razor sharp edges, best to use sandpaper here) and you have a limitless supply of free conductive glass. You could use an LCD but the liquid is fairly toxic and the front is not a continuous layer.
To coat with whatever you like, harvest a working fan (for convenience I used a 48V one) undervolted a bit to reduce the speed. This approach works well for most spin coating applications and was originally discovered by the guys at Cambridge working on OLEDs TTBOMK.
Recently rediscovered as a way to make your own OLED panels...
Guess who is planning to build a transparent ultracap... :) :)
-A
"Bother" said Pooh, as he dropped Superglue on his trousers...
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 373
Proud Mary wrote ...
What about carbon nanotubes as used in paper batteries?
I gathered that the simplest method for creating carbon nanotubes is burning graphite electrodes in Helium atmosphere. It doesn't get any easier than that, I suppose. Well, maybe someone wants to investigate vine charcoal. Maybe there are some types of plants that produce charcoal with a high amount of open pores
google for "charcoal microscope", the search yields some nice REM shots of the structures
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Conundrum wrote ...
hey there Proud Mary. I have a cunning idea. If you email me your address I can send you a sample of all the conductive glues I have available.
I have two different types of RTV adhesive, graphite powder, conductive thread, ultra fine steel wire, conductive fabric (free sample), EMC packing for RAM, elastomer rubber strips, Shapelock, glow powder etc.
'Tis only fair, as I did get some goodies from you.. :)
EDIT:- I also came up with the deviously cunning idea of salvaging the coating from a defunct up to air CRT. to do this you require some sort of solvent and a suitable container resistant to it.
EDIT 2:- another way is to make colloidal silver and dry it. See for how. Or you could buy it but why bother when its trivial to make?
Oh, and I also discovered that if you have any "dead" bottles of silver paint the remaining (useful) coating can be salvaged easily using nothing more complicated than nail polish remover and a bit of agitation. Dry this off carefully on a surface and then scrape off paint into a suitable container for mixing with the graphite and RTV tyre repair compound.
Note, they just changed the packet so you may need to be careful. It "looks" identical but i need to test it first)
Another interesting idea is to purchase a spare resistive touchscreen (busted e-readers, DS's, phones and POS machines come to mind) and "harvest" the perfectly good front plastic sheet and rear glass if it isn't too badly smashed.. Bit of gentle butchery with a glass cutter and gloves (watch those razor sharp edges, best to use sandpaper here) and you have a limitless supply of free conductive glass. You could use an LCD but the liquid is fairly toxic and the front is not a continuous layer.
Guess who is planning to build a transparent ultracap... :) :)
This is very thoughtful of you, but may be too much of a digression for a super capacitor thread. I have chosen carbon for my conductive cathode coat because of its high transmittance of X /gamma-rays, which cannot be said of the metal-based conductive coatings - Ag, Ni, Al, and so on - which will also introduce photoelectric artefacts in the form of characteristic rays of each element in the conductive coating. With the exception of the gold plated anode wire, there is to be nowt but C and H in the whole caboodle.
And to Mr Bond, you can also make nanotubes with a carbon arc in argon, something which I'm hoping to do some time this year.
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Home made super capacitors.
