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Tubes Asylum Questions about tubes and gear that glows. |
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In Reply to: Nanotubes-Be excited or be afraid? posted by sam@edelmannpgh.us on May 24, 2012 at 15:19:23:
The article makes some factual errors about semiconductor processing, including a mention of vacuum. Well, vacuum, usually 'hi vac' is essential to the manufacture of semiconductors.
That the etched cells in a SS vac tube do not need to be at a hi-vac level is because of a concept called 'mean free path'. This means the electron is more likely to hit the wall than a molecule of atmophere. In a small space this works. For larger spaces for this to occur, you need less air for the electron to hit...thus needing vacuum.
Vacuum tubes are at about 10e-6 torr which is pretty good.
You can look up the Wiki on the subject but it is pretty dense. The idea is simple, though.
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Follow Ups
- RE: Nanotubes-Be excited or be afraid? - pictureguy 10:45:29 05/27/12 (0)
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