Hello dear friends,
I want to make a suspension of magnesium carbonate in isopropyl alcohol. The size of magnesium carbonate particle is in the range of 20 - 60 um. When I make a suspension from this magnesium carbonate in isopropyl, my suspension precipitates after 1-2 days. I want to prepare a suspension that not precipitate before at least 6 months.
Note 1: I don't access to magnesium carbonate with smaller particle size.
Note 2: My suspension is used on skin and I can't use any component that is harmful for human skin.
if you want to use it as skin-care or healing products, you may try increasing the solution viscosity, using various kinds of polymers like gelatin or agar. Bun since you are using Isopropyl alcohol, be sure whether they dissolve and generate stable viscous jelly like typical water solution. But then you have to add some preservatives and antioxidants as well, whose carcinogenicity and reactivity with alcohol, among many other factors has to consider
If you do not want a free-flow product, you may try slurry of MgCO3 suspended in isopropyl alcohol with inert filler materials like Kaolin, silica, talc,starch (these are just for examples, I am not sure about their reactivity with magnesium carbonate and isopropyl alcohol; and also not sure how clay minerals react with magnesium carbonate inside body)
if you can change the solvent, isopropyl alcohol, then you may prepare fine MgOH suspension by alkali precipitation of Mg salt, and add Phosphate buffer to keep PH
