I need to make precipitate, in two separate experiments, LiOH and Li2CO3 on the silica nanoparticles surface contained in a colloidal alcoholic dispersion.
Since the method I used to make precipitate them on the silica surface, does not allow to obtain an uniform layer around the silica nanoparticles, then I would like to know what kind of functionalization of the SiO2 nanoparticles could be helpful to improve the affinity for the LiOH/Li2CO3 to nucleate more uniformly instead of nucleate on a specific point of the silica surface and then grow, so resulting in a non uniform shell-core structure.
Do you have some suggestion?
Thank you
Could you please describe the current method that you are using?
Hi Omar Gonzales-Ortega, thank you for the answer.
The method I am using is similar to one I found in literature (Nanocomposite powders from coating with heterogeneous nucleation processing, Zhang, Gao, 2000).
In the system I set up the precipitation is due to:
- mixing of isopropanol, in which LiOH is insoluble, to an Ethanol solution saturated with LiOH containing SiO2 nanoparticles; since the system is not an ideal system, namely the LiOH solubility curve in mixtures ethanol-isopropanol is convex, so the precipitation occurs.
- mixing of ethanol, in which Li2CO3 is not soluble, with an aqueous solution saturated with Li2CO3 containing SiO2 nanoparticles;; the precipitation occurs due to the convexity of the solubility curve in such binary liquid mixture.
In the case of LiOH I used an alcoholic mixture and the concentration of LiOH is about 15 g/L, in the case of Li2CO3 its concentration is about 10 g/L.
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