**3. Conclusions**

This chapter demonstrated the potential of titanium dioxide (TiO2) in imparting UV protection, anti-wear, corrosion inhibitor, gas detection properties. In the mechanical sector, TiO2 can be used as a corrosion and wear-resistant material. TiO2 coatings protect the substrate from the corrosive medium by serving as a ceramic barrier and also provide cathodic protection to the metals under UV illumination because of the photo-electrochemical property of TiO2. A tremendous increment in the corrosion resistance of the sample with the application of TiO2 coatings proved the potential of TiO2 as a corrosion inhibitor. TiO2, owing to its high hardness, fracture toughness can be embedded in a composite to improve the tribological performance of functional layers in numerous applications. TiO2 is also found to be a suitable candidate for bone implants. The bioactivity tests revealed that the acid treatment of TiO2 enhances the cell attachment and the bonding of the implant with the bone tissues. Owing to the high refractive index, TiO2 layers are applied in sunscreens to protect the human skin from harmful UV rays. TiO2 is also incorporated in textiles to reduce its photochemical degradation and therefore its mechanical properties are retained even after exposure to UV light. The whiteness, brightness, and hiding power of TiO2 pigments are utilized in paints, coatings, papers, textile industries, etc. By adding certain minerals the degree of dispersion of TiO2 pigments can be improved that further enhances the pigment properties of TiO2. The change in the electrical resistance of TiO2 layers was exploited to develop a gas sensor for air quality monitoring and a lambda sensor for monitoring of air-fuel ratio of internal combustion engines. TiO2 nanoparticles have been found to outperform their bulk counterparts in such applications, which can be attributed to their large surface area to volume ratio.

*Titanium Dioxide and Its Applications in Mechanical, Electrical, Optical, and Biomedical Fields DOI: http://dx.doi.org/10.5772/intechopen.98805*
