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4hv.org :: Forums :: General Science and Electronics
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Graphite and lasers

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Conundrum
Fri Jan 04 2013, 10:02PM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Link2

Interesting,how come no-one noticed this effect before?

It suggests that the diamagnetism in pyrolytic graphite has a pronounced sensitivity to heat, which I wasn't aware of.

-A
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Carbon_Rod
Sat Jan 05 2013, 02:47AM
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
People have observed a photoelectric effect with low temperature graphene.

Neat, I wonder how it would behave in a Halbach array configuration.



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Inducktion
Sat Jan 05 2013, 04:33AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Conundrum you always post the most interesting things...

This is really cool, I gotta say. If you could get a big enough graphite disc you could make an engine I'd think!

Only thing I'm curious about is efficiency...
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Conundrum
Sat Jan 05 2013, 09:12AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Has anyone ever tried plating PG with bismuth (another good diamagnetic material) ?
A few microns should do it as Bi is almost as diamagnetic as pyrolytic graphite..
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Myke
Sat Jan 05 2013, 10:20AM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
That's pretty darn awesome (all of it)! Unfortunately, it requires high magnetic fields but still may find cool uses. cheesey
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carrotSnack
Sat Jan 05 2013, 01:20PM
carrotSnack Registered Member #4115 Joined: Fri Sept 30 2011, 01:13PM
Location:
Posts: 12
I'm a frequent lurker here but now that you've posted that I can't resist posting.
I bought some pyrolytic graphite early last year and constructed short maglev tracks with it along with experimenting/playing.

After seeing the video a week or two ago I tried this myself with focused sunlight to control a piece of PG on a track, wasn't as effective I hoped but it definitely worked.
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Conundrum
Sun Jan 06 2013, 05:19AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
We request a replication video smile

Also, it appears that it may need blue diodes to work, as the absorption of red light would spread the effect out too much.
The graphite might wobble though, mind the reflections off the magnets! WEAR GOGGLES!

No doubt miniature versions of this with itty bitty coils made from plastic coated with ITO will surface as solar chargers shortly, the parts can be sourced cheaply with a simple lens array made from recycled plastic and a drill press.

I propose we call this device an "Optokinetic transformer"
-A
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