Fabrication and Characterization of Cosmetic Grade Tio2@Sio2for Uv-Shielding Ingredient

Abstract

Nano TiO2 can generate reactive oxygen species (ROS) under ultraviolet radiation, causing damage to organisms, polymers, and coatings. It is urgent to develop a TiO2 core-shell material to reduce the health concern and potential risks of TiO2 used as an active sunscreen ingredient in cosmetics. This article reports the synthesis of TiO2@SiO2 core-shell materials by a chemical deposition method starting from rutile nano TiO2 and Na2SiO3. The results revealed that the morphology, structure, and optical properties of the surface coated SiO2 shell are affected by the pH value of the reaction solution. Under alkaline conditions, it can obtain a uniform and dense continuous SiO2 shell layer, which not only improves the whiteness and brightness of TiO2, but also reduces oil absorption. The TiO2@SiO2-10 sample coated under pH value at 10 showed a better sun protection factor of 41. From process simplicity and product application characteristics, it is commercially feasible as a cosmetic grade nano TiO2.

Keywords: TiO2@SiO2, core-shell structure, UV-shielding, SPF