Dust repellent surface coating
Provided herein are compositions for coatings that repel dust. The compositions comprise colloidal silica suspended in a low molecular weight alcohol, one or more hard nanoparticles, a fluoride source, and one or more combustible organic compounds. Methods of preparing a coating from the compositions are also provided herein.
1. A dust repellent coating comprising chain-structured aggregate colloidal silica suspended in a low molecular weight alcohol, one or more hard nanoparticles, and one or more combustible organic compounds.
2. The coating of claim 1 , wherein the nanoparticles are selected from the group consisting of alpha alumina, gamma alumina, boron carbide, diamond, micronized quartz silica, silicon carbide, silicon nitride, titania, titanium carbon nitride, titanium diboride, zirconia, and mixtures thereof.
3. The coating of claim 1 , wherein the nanoparticles have a diameter which is smaller than the thickness of the coating as measured after annealing.
4. The coating of claim 1 , wherein the one or more combustible organic compounds is a fatty acid.
5. The coating of claim 4 , wherein the fatty acid is stearic acid, oleic acid, or a mixture of one or more fatty acids.
6. The coating of claim 1 , further comprising a fluoride source.
7. The coating of claim 6 , wherein the fluoride source is selected from the group consisting of magnesium fluoride nanoparticles, hydrofluoric acid, hydrofluoric acid catalyzed titania organosol, and hydrofluoric acid catalyzed zirconia organosol.
8. The coating of claim 1 , wherein the one or more hard nanoparticles are titania nanoparticles, zirconia nanoparticles, or mixtures thereof, and wherein the nanoparticles are a dry powder.
9. A dust repellent coating comprising chain-structured fumed silica suspended in a low molecular weight alcohol, one or more hard nanoparticles, and one or more combustible organic compounds.
10. The coating of claim 9 , wherein the nanoparticles are selected from the group consisting of alpha alumina, gamma alumina, boron carbide, diamond, micronized quartz silica, silicon carbide, silicon nitride, titania, titanium carbon nitride, titanium diboride, zirconia, and mixtures thereof.
11. The coating of claim 9 , wherein the one or more combustible organic compounds is a fatty acid.
12. The coating of claim 4 , wherein the fatty acid is a mixture of saturated and unsaturated straight chain aliphatic monocarboxylic acids.