Re: phonic and thermic insulation
From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 12/10/04
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Date: Fri, 10 Dec 2004 07:45:34 -0800
laetitia wrote:
>
> Hi,
>
> I'm a scientific researcher in a french company.
> I'm looking for materials having good phonic and thermic insulation properties.
> What parameters are important ?
> Which materials could you recommand me ?
Look at Peltier device semiconductors and their research - filled
scutterudites, etc. A good electronic semiconductor is necessary for
efficient heat pumping. The electronically conductive lattice
contains small ions that rattle in cages, scattering phonons,
providing poor thermal conductivity to keep the temperatures
separated. The magnitude of relative effect is temperature-dependent.
On larger scale, hollow glass microballoons potted in an acoustically
lossy rubber (e.g., Sorbothane) to give a syntactic foam that
transmits neither heat nor sound. A high molecular weight freon or
SF6 foaming polyurethane or polystryrene would invoke Enviro-whiner
snit.
-- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf
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