Composite metal oxide particles and methods of making and using the same
View Patent ↗Composite inorganic particles and compositions containing silica particles are disclosed. Methods of making silica particles and methods of using composite inorganic particles are also disclosed.
1. A dispersion of composite inorganic particles comprising:
a liquid; and
composite inorganic particles dispersed throughout said liquid, said composite inorganic particles comprising (i) a silica core 1 and (ii) a coating comprising a metal phosphate formed thereon, wherein the metal phosphate comprises calcium phosphate, magnesium phosphate, or mixtures thereof, wherein the dispersion comprises from about 1 to about 40 wt % solids based on a total weight of the dispersion and the dispersion has a pH of from 9 to 14.
2. The dispersion of claim 1 , wherein the metal phosphate comprises calcium phosphate.
3. The dispersion of claim 1 , wherein the metal oxide comprises nano-particles.
4. The dispersion of claim 1 , wherein the composite inorganic particles comprise a weight ratio of (i) metal of said metal phosphate to (ii) weight of silica of about 0.001 to about 0.5.
5. The dispersion of claim 1 , wherein the dispersion has a pH of from 9.3 to 9.5.
6. The dispersion of claim 1 , wherein the composite inorganic particles have a median particle size ranging from about 0.001 μm to about 50 μm.
7. The dispersion of claim 1 , wherein the metal phosphate comprises magnesium phosphate.