Martinl,

Use bismuth or any of its alloys and eutectics that do not contain
cadmium or other poisonous metals. That has a very high heat of fusion
of the metal.

Uncle Al is an idiotic spooooook.

At the criminal agency they only taught him nitrates to sabotage and
terrorise the populations of the target countries. In Italy there are
warrants for arrest of these bastards. The work by lie and deception.
on 911 these bastards killed 3000 of their people and put the blame on
other nations. FBI cant even show a single proper and authentic video
of pentagon being hit. thats the HQ or defense. But these bastardz
have bugged every single female bathroom and newt gingrich their
leader committed adultery on BOTH of his wifes.

YOU CAN REALLY TRUST THEM A LOT !!!!

Bismuth is probably bening. If cost is not a matter you can probably
add indium also but I am not sure of toxicity of indium. I think that
gallium is fairly safe. Its given for gallium scan for testing of
cancers.

please visit my favorite website 911blogger.com and also
counterpunch.org and alsowww.nkusa.organd spread the word of the
crimes of these bastardz.

On Mar 9, 8:06 am, Uncle Al <Uncle...@hate.spam.net> wrote:

martinl wrote:

I looked up Magnesium Nitrate Hexahydrate

http://physchem.ox.ac.uk/MSDS/MA/magnesium_nitrate_hexahydrate.html

and found that it is quite flammable and somewhat toxic

What I'm working on requires a heat sink that that will give up it
heat slowly through the operating temperature of between 50 and 100
C. I want to imbed this substance in silicone rubber and cycle it
about 2000 times.

Magnesium Nitrate Hexahydrate has the right melting point, but seems
to be to toxic and flammable to be handled.

Any other suggestions?

If you want a big /_\H(fusion) then all sorts of lattice interactions
must be in there to sop up/release the heat. Strong solid lattice
interactions vs. liquid imply large volume change. Benzil melts at 95
C but its enthalpy of fusion is only 27 cal/g. Water is 80 cal/g.

<http://www.cbs.umn.edu/labs/victor/pdf_reprints/Matulis_BiophysChem01.=

Linear long chain (~20 carbons and longer) alkanes (paraffin wax),
alcohols, and amides (higher mp) have large /_\H(fusion) from efficent
lattice packing. They substantially increase in volume when they
melt. Wax is cheap. Miscible mixtures will have weighted average
properties - more or less. Test before you venture.

Poly(ethylene oxides) also have respectable /_\H(fusion), low
toxicity, and wide range of molecular weight and properties.

For highly crystalline high MW paraffin wax, mp~73-80 C,
/_\H(fusion)~50 cal/g. That's about the best you can do on the cheap,
FDA-approved, in the temperature range. You'll get a volume change
around 15%. It has been used as a thruster for automobile radiator
valves.

You must polymerize the matrix below the mp of the co-phase. Stuff
migrates through solid silicone rubber with remarkable facility. Will
your dispersion agglomerate or surface bloom with thermal cycling?

The usual thermal ballast approach is to have flexible plastic ravioli
filled with active material - individuals, strings, sheets. Volume
change is accommodated by not filling the membrane taught with solid.
Volume packing inefficiency is balanced by small fraction of inert
matrix. Failure of one pouch does not compromise the others.

It helps if the membrane is not compromised by the melt, both as film
and at the edge seal.

--
Uncle Alhttp://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)http://www.mazepath.c=

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