Cobalt oxide nanoparticle is insoluble in water. I have tried to dissolve this in a number of acids and bases. Can anyone suggest an ideal solvent which can dissolve cobalt oxide nanoparticle?
Hi Kashmiri,
At first, try to dissolve your cobalt oxide nanoparticles in appropriate amounts of HNO3, which in my point of view, is suitable. Just in case you are not able to dissolve it in this way , you definitely will do that with 1:1 ratio of H2O2 and HNO3 by volume.
Have you tried piranha solution? 1:1 h2o2:h2so4.. or even aqua regia 3:1 hcl:hno3.. be careful when using such solutions, they heat a lot when prepared, piranha is better if used hot, aqua regia can be used when gets colder
CoO has basic nature but dissolution process is slow. You need strong acid like HNO3, H2SO4. I am not sure that H2O2 can help because redox transformations expected lead to insoluble products. Effect of temperature is also useful. Usually, heating can help. If no, try cooling.
Good luck...
Dear Dr. Deka:
Further "solvent" depending on the next step of use of "dissolution", as mentioned. Also, a superior degree of "green chemistry" should be alway preferred. If there is an intention of re-processing of the nanoparticle dissolved or reach the preparation of new nanoparticle class of nanoparticle as nanoparticles with metallic features. Some of dissolution process gives rise a not thrue oxide-dissolution but a kind of new compound type oxi-hydroxi and complex compouds containing H, or molecules of H2O, naturally an excess of dissolution agent is present. In this sense, oxide can be transformed in an other compound but in solution state as citrate, a priori, cations Co be dispersed in the solution, type aqueous solution.
An interesting way to "dissolution" is use ethilene glycol, under sufficient heat, the oxide will be undergo a thermodynamic transformation gives nanometric mettalic particles, which can be used in a direct way at another steps. In a general way, this method is called of Polyol Method. As a whole, all steps are non dangerous and low cost, also contain a bit of green chemistry.
Kind regards
Marcos Nobre (MAL Nobre)
Hi Kashmiri, Can you tell me what solvents did you use for Cobalt oxide particles to get dissolve?
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