DiagNano™ coated silica particles are provided with other inorganic structures on the surface including titania (TiO2) and alumina (Al2O3). Titania coated silica particles particles are available in the size range of 300 nm to 20 µm, and alumina coated particles are available in the size range of 300 nm to 800 nm. These particles are supplied in water without any surfactants.