nanobatteries

From: Fred Chen (flipsu5_at_comcast.net)
Date: 09/11/04 

Date: 11 Sep 2004 16:23:48 GMT

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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