Investigation Of Surface Modification And Dispersity Of Nano-SiO₂

Nano-SiO₂ has attracted much attention in resent years as a novel type of inorganic materials because of its excellent property. However the high surface activity of nano-SiO₂ induces strong agglomeration, that resulting in the formation of large agglomerate with weak interacted interfaces. And the hydrophilicity of its surface makes it difficult to be dispersed uniformly in organic medium. Therefore, its practical application is much restricted. Accordingly, the key that nano-SiO₂ can be applied widely lies in modifying the surface of nano-SiO₂ for the purpose of eliminating agglomeration and improving dispersity in organic solvents.The first part of work this reports that nano-SiO₂ was uniformly coated with Al(OH)₃, and then modified by neopelex, which improved the surface structure and dispersity. The influence of pH value, dispersant content, drying condition and so on on coating result during the process of inorganic coating were studied. Through determining surface adsorption capacity, the influence of temperature, dispersant content, pH value and stirring time during the...