I am preparing an ink using copper powder in DCM...i am also adding Ethylene Glycol Butyl Ether.....but after few minutes the solution turns into light green color!!! while copper powder settles at he bottom....why this green color appears?? Is it like oxidation happening of copper with Ethylene Glycol Butyl Ether???
Ethylene glycol butyl ether forms a chelate complex with copper hydroxide, which absorbs part of the visible spectrum. Therefore, there is an intense color. Copper hydroxide is always present on the surface of copper powder as a result of air oxidation by oxygen.
Yuri Mirgorod ... so formation of this will not affect the copper powder properties? Will this be removed/evaporate during sintering of copper powder (at 1150 `C)??
Also in the case of iron powder, there is a formation of dark greyish layer over the iron powder which settles at the bottom....does this mean similar effect in the case of iron as well?
When sintering copper powder, the complex will decompose along with ethylene glycol butyl ether.
On the surface of iron, as you know. there is always rust. In dichloromethane, it has a different color.
Yuri Mirgorod .... So the copper powder which settles down at the bottom (shown in the picture), doesnot have any effect of the complex compound so formed? Will that be a pure copper (i.e. free from oxides)???
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