RE: nanobatteries
From: Fred Chen (flipsu5_at_comcast.net)
Date: 09/11/04
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Date: 11 Sep 2004 16:28:39 GMT
[ Moderator's note: Oops. Was working through the queue and noticed Fred's
"disregard" request too late. His replacement will follow in another post.
-JimL ]
Pls disregard this earlier post. I will send a replacement.
thx,
Fred
-----Original Message-----
From: Fred Chen [mailto:flipsu5@comcast.net]
Sent: Friday, September 10, 2004 11:07 PM
Subject: nanobatteries
Presumably in any nanomachine, electrical energy would be stored in a
very small capacitor.
I estimated the capacitance that could fit in a nanoelectrical device by
assuming permittivity of vacuum, area = 100 nm X 100 nm, gap = 10 nm.
This gives a capacitance of 8.85e-18 farad. At an operating voltage of
1V, that means 55 electrons stored when fully charged. At 300 K (room
temperature), the kT/C voltage noise amounts to 3s/avg ~6.5%. This
capacitor nanobattery will obviously discharge current in a pretty
"chunky" fashion. If the dimensions are scaled up 10x (micron-sized
capacitor), the number of electrons stored at full capacity also goes up
10X to ~550, which allows the picture of continuous flow to be more
realistic.
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