From: Dickey, Michael F (michael_f_dickey@groton.pfizer.com)
Date: Wed Apr 03 2002 - 13:27:21 MST
From: Charles000@aol.com [mailto:Charles000@aol.com]
Sent: Saturday, March 30, 2002 5:24 PM
To: extropians@extropy.org
Subject: re: TECH: SUPER/ULTRA CAPACITORS, was Re: PHYS: Fractal
Nanopore Storage (Out o
>I've got a couple of sample carbon-aerogel supercapacitors right now. 10
>Farad, 2.75 volt, the size of AA cells with incredibly low ESR. Nifty. I'm
>torn between building some sort of BEAM device and using them for
spotwelding
>thermocouple junctions...
Greetings:
Are these ultra-capacitors commercially available, and if so, from where?
Or even just research prototypes would be fine. Any info you could forward
along is highly appreciated.
Charles
---------------------------------
Charles, If you go to www.matweb.com (a good source for information on
materials) and look up 'aerogel' they will provide a link to suppliers.
Here is the main supplier for silica aerogels and carbon aerogels they list
They also have RF aerogels and new alumina aerogels
http://www.mkt-intl.com/aerogels/index.html
You can get carbon aerogel papers (the ones good for ultra capacitors) on
this page
http://www.mkt-intl.com/aerogels/aerogel_order.html (scroll to bottom)
They are sold as paper like sheets 3.5" x 10". 5 sheets go for $100 US
Their chart says it all!
Properties of Carbon Aerogel Available Ranges
Density 0.3 - 1.0 g/cm3
Surface Area, BET 400-1200 m2/g (1200 m^2 !!!!!!)
Average Pore Size 0.5 nm
Compressive Modulus 3000 psi*
Electrical Resistivity 0.010 - 0.040 ohm-cm*
Capacitance 30 F/g* (30 F/g !!!)
Thermal Conductivity 0.4 W/m/°K*
Gas Permeability 4.86x10-12
Color black
You should be able to get two paper sheets and roll them into a cylinder
with a dialectric sandwiched between them and make a good ultra cap.
Hope that helps.
Michael Dickey
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