| Topic: |
Science > Physics |
| User: |
"heiko ackermann" |
| Date: |
09 Jan 2005 05:12:20 PM |
| Object: |
changing of acoustic impedance under pressure |
Can someone say me if there exits a liquid which changes enormous
under pressure about serverall kBar ( serverall thousend atms) it's
acoustic properties especially it's acoustic impedance, without phase
changing. (With enormous i mean about four or five times .)
Heiko
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| User: "Uncle Al" |
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| Title: Re: changing of acoustic impedance under pressure |
09 Jan 2005 05:51:12 PM |
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heiko ackermann wrote:
Can someone say me if there exits a liquid which changes enormous
under pressure about serverall kBar ( serverall thousend atms) it's
acoustic properties especially it's acoustic impedance, without phase
changing. (With enormous i mean about four or five times .)
Silicone oil (PMDS) had remarkably large free volume and rotational
mobility about silicon. Silicone oil should be very compressible with
changing acoustic properties when things start to jam in. You might
dilute with low oligomers (hexamethyldisiloxane) to adjust properties
at very high pressure. No guarantee, of course. Silicone oil is a
terrible mess - it flows everywhere and into everything. Absolutely
keep it away from high vacuum systems.
Alkali metal halides flow like water under pressure. Perhaps CsI with
two big floppy ions is springy enough to give major density changes
with high applied pressures. Then you have the extremes LiI and CsF
where things may rattle around until you squeeze down.
Liquids under pressure solidify at increasingly high temperatures
under pressure. Among the lowest melting points at high pressures for
organics is the EtCN/PrCN binary phase diagram. Hard to say if its
acoustic properties will show dramatic changes.
What about a dense hard filler (fumed silica, polishing alumina) in a
low density compressible liquid? As you squeeze down void space will
disappear and acoustic properties will change drasitically.
--
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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