PSN-L Email List Message

Subject: Diamagnetic levitation materials
From: "Charles R. Patton" patton@..........
Date: Fri, 08 Oct 1999 16:31:02 -0700


I found another site posting magnetic susceptibilities.  Go to:
http://www.reade.com/Particle_Briefings/magnetic_susceptibilities.html
Unfortunately, the aluminum sulfates mentioned in George Harris=92 list
below are not in this list.

George Harris posted the following magnetic susceptibility list from the
handbook of Chemistry and Physics (59 th edition - 1979)
Carbon or diamond   -6
Bismuth (solid) -280
Aluminum Sulfate (anhydrous) -93
Aluminum Sulfate Hydrate (Al2(So4)3.18H2O -323
Calcium Carbonate  -38
Ammonium  Nitrate  -34
Ammonium Sulfate  -67

Thanks for the additional information, but now I am bothered.  I
understood from other comments that bismuth was supposed to have the
highest constant, but aluminum sulfate hydrate is shown with bigger
numbers.  Is there some independent reference where we can verify that
number?  Usually the CRC handbook gives the reference for the data.
Could you please post that?  Thanks.

A small bit of discussion on the above materials.  Aluminum sulfate
hydrate is soluble in water but decomposes above 86 degrees C.  So to
get a reasonable solid piece, you could probably slowly, ever so slowly,
evaporate a solution leaving behind a cake/crystalline mass.  From that
viewpoint, ammonium sulfate would be much easier to do something with.
It decomposes at 235 degrees C.  So you could spray onto a hot surface,
building up a shape that would be pretty much void free or boil off the
water to leave a solid cake with probably some porosity.  The minus 67
number is still better than the minus 6 of carbon, even taking into
account densities.

My carbon rods are in from  McMaster-Carr, so maybe this weekend I=92ll
slice=92n=92dice up a test panel=92s worth.  A quick test shows that they=
 are
diamagnetic at least.

Charles R. Patton
charles.r.patton@........



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Larry Cochrane <cochrane@..............>