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In Reply to: RE: I'm looking forward to your report. posted by Al Sekela on September 16, 2007 at 15:43:30
looked into nanotubes as well... problem with nanotubes is that they are a BEAR to disperse in epoxy... you need a powerful ultrasound stirrer, and buckyballs are out because they are neurotoxins, as of the last report I read... there is a machine shop in Russia that will mill you some nice depleted uranium cones for a more glowing sound... but DU is so not PC I thought I'd not use that....
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you might consider developing your own plate laminations using carbon fiber cloth. Barium titanate powder would increase the epoxy's dielectric constant and improve coupling of radiated noise to the carbon fibers.
Get this... one of the tin doped variants exhibits a *negative* young's modulus.... in other words it bends in the opposite direction of flexure, even diamond wont do that, and it is seriously piezo-electric...
Sooooo... what happens if BaTi03 is bound with an electo-dissapative like a graphite matrix ? Hmmmm... are microflexions then generating microcurrents that can be resistively drained ? Say, if diamond is present is will provide a hard substrate for BaTi03 to be compressed against, and is high purity graphite is included, the resulting piezo energy is then drained out ? What a truly fascinating and bizarre but logical idea.... like a physical substance that behaves like an active damping platform, but moldable and injectable, and environmentally friendly ? Off to see if they'll sell me a bottle of it...
Your ideas are new to me and sound like a great possibility for damping.
I once worked for a fellow involved with Ramtron, which developed the ferroelectric memory described in the Wikipedia article at the link.
However, the reason I suggested barium titanate as an additive is to increase the dielectric constant of the epoxy surrounding graphite fibers in a laminate such as used on the Oyaide outlet cover plate. This would make the laminate more effective at damping the electric field components of RF standing waves, by analogy with the way the high permeability layer of TI Shield makes it more effective at damping the magnetic field components.
I actually understood what he was saying. Now you go and muddy the waters... LOL
Hyper pure graphite is kind of fascinating.. it doesn't have the greasy "wet" quality of bituminous graphite, it looks, feels, and behaves like a novel material... I mean...not THAT novel, but it suggests things.... once the carbon load exceeds about 22% the material changes from an insulator to a conductor....
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