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Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
I need a suggestion for a substance with a bunch of specific properties - I'm using this in a multi-phased mixture so I need good compatibility with the neighboring phases. This is a tall order, I know, but here is what I need:
-Density > 1.1g/ml -Nonpolar, or at least will not dissolve a highly polar neighboring phase. -Doesn't react appreciably with low concentrations of aqueous ammonia. -Contains no water or hydroxide ions. -Low viscosity - which I take to mean "lower than glycerine" which proved too thick for my use.
My thought is mercury, however mercury has some bad habits of its own. The alternative is a mercury substitute like a gallium alloy, but those are a real pain in the ass to work with because they wet everything and are $$$. Glycerine proved too thick, and it seems to collect water.
Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
Has to be liquid at STP, chipquik and other low-melt alloys (Fields/Woods metal) are out. The "highly polar neighboring phase" has one hell of a vapor pressure and also burns the eyes, so I can't heat things up. :(
Registered Member #1937
Joined: Sun Jan 25 2009, 12:28PM
Location:
Posts: 53
I agree to bored chemist, galinstan woudl be the best alternative for you and could even be produced at home if you cannot get hold of the alloy. If you are making a reaction i think that the NaK alloy is of no use to you but it too would eb an alternative as it has a low melting point and is, to my knowlage, only reactive but not toxic. There are three more allyos that could be used by you either:
1.Ga 62.5, In 21.5, Sn 16.0 2.Ga 69.8, In 17.6, Sn 12.5 3.Cs 77.0, K 23.0
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
The alkali metals and their alloys are not compatible with this requirement from the original post "Doesn't react appreciably with low concentrations of aqueous ammonia."
Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
thanks for the help guys. the only obstacle to the galinstan is the cost, and it's poor manners (sticks to EVERYTHING), however I guess those can be overcome. I need about 25-50mL of whatever I choose, and while I have some galinstan, 7gm (maybe 1ml) was $21!!
Does anyone know of something that galinstan doesn't wet?
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mercury substitute?
