The surface modification and functionalization of precipitated silica is an important field, aiming to endow silica with new functions and applications by changing its surface properties and structure. The following are several common research directions for surface modification and functionalization of precipitated silica:

Surface coating modification: The surface of precipitated silica is coated with a layer of organic or inorganic substances, such as polymers, silicone oil, silicon dioxide, etc., to change its surface properties and enhance its compatibility with matrix materials. The coating layer can adjust the hydrophilicity, dispersibility and anti-oxidation performance of silica.

Surface functional modification: By introducing different functional groups on the surface of precipitated silica, such as amino groups, hydroxyl groups, carbonyl groups, etc., the reaction and combination of surface functional groups with other substances can be realized. Such modification can endow silica with specific chemical activity, affinity and functionality, thereby broadening its application fields.

Surfactant modification: Use surfactants or surfactants to modify the surface of precipitated silica to improve its dispersion and stability. The introduction of surfactant can effectively reduce the aggregation and precipitation tendency of silica, and improve its dispersion performance in aqueous or organic phase.

Silane coupling agent modification: By using silane coupling agent to modify precipitated silica, it can achieve good compatibility and combination with organic matrix materials. The silane coupling agent can form chemical bonds on the surface of silica to improve the dispersion and reinforcement effect of silica.

Surface functional modification: By introducing compounds with specific functions on the surface of precipitated silica, such as metal catalysts, antibacterial agents, adsorbents, etc., special properties and application functions are given to silica. This modification can expand the application range of silica, such as catalysts, antibacterial materials, adsorption materials, etc.

Through these surface modification and functionalization studies, the surface properties and structure of precipitated silica can be adjusted, and its dispersibility, reinforcement effect, hydrophilicity, chemical activity, etc. can be improved. This provides more possibilities for the application of precipitated silica in rubber, coatings, plastics, catalysts, environmental governance, medicine and other fields, and promotes the functionalization and application innovation of silica.