Addition of Titanium Dioxide and Sources Effects on UV Transmittance and Hydrophilicity of Chitosan Film

A hybrid membrane of chitosan and titanium dioxide (TiO2) was formed for the purpose of protecting skin. Chitosan extracted from shrimp shells mixed with 0~4wt% TiO2 particles by sol-gel hybrid method. The hybrid was coated on glass slide for the photo spectrum analysis and hydrophilicity testing. Transmittance of Ultraviolet (UV)-Visible light (230nm~800nm) of the hybrid was determined by a UV- Visible photo spectrum. The hydrophilicity of hybrid was measured by contact angle method. The sample contained 1wt% has best UV absorption capability. For the sample with high TiO2 concentration, the dispersion of TiO2 is low and particle size is large so that the absorption of UVB becomes weak. On the other hand, the effect of the concentration of chitosan on the transmittance of UV is not significant. The hydrophilicity of hybrid could be improved by raising the concentration of chitosan. The hybrid could be applied into the dressing material which could block UV radiation.