Effects of porous films on the light reflectivity of pigmentary titanium dioxide particles

Modification of SiO2 Nanoparticle-Decorated TiO2 Nanocomposites with Silane Coupling Agents for Enhanced Opacity in Blue Light-Curable Ink

“…As a common inorganic coating material, SiO 2 nanoparticles were easily deposited on the nano-TiO 2 particle surface by a liquid-phase deposition method, forming a dense and continuous SiO 2 coating layer at a pH value of 9 or forming a SiO 2 nanoparticle coating layer at a pH value of 7–8 . However, compared to the SiO 2 nanoparticle coating layer, the dense and continuous coating layers would lower the refractive indices of SiO 2 -coated TiO 2 nanocomposites . Generally, the higher the refractive indices, the higher the opacity performance of the material.…”

“…11 However, compared to the SiO 2 nanoparticle coating layer, the dense and continuous coating layers would lower the refractive indices of SiO 2 -coated TiO 2 nanocomposites. 12 Generally, the higher the refractive indices, the higher the opacity performance of the material. SiO 2 nanoparticle-decorated TiO 2 (SiO 2 /TiO 2 ) nanocomposites had higher opacity performance.…”

Fabrication of SiO2/Al2O3 Composite-Coated TiO2 by Pulsed Chemical Vapor Deposition and Its Applications

“…6 However, the high photocatalytic activity of TiO 2 pigments may cause chalking, discoloration, and breakage of paints and plastics when exposed to sunlight. 2 In addition, when used as an ultraviolet absorber in sunscreen, the photogenerated free radicals of TiO 2 can also lead to the deterioration of organic ingredients and even cause skin problems. 4 In this case, inert films must be used for surface modification to suppress the photoactivity and hinder the interactions between TiO 2 and the outer environment.…”

“…As a multifunctional material, titanium dioxide (TiO 2 ) has been widely used as a catalyst, white pigment, catalyst carrier, and ultraviolet absorber . TiO 2 is also a typical semiconductor material that exhibits high photocatalytic activity and can produce highly reactive radicals ( · OH and · O 2 – ) that can degrade organic substances .…”

“…Many applications of TiO 2 prefer promoted photocatalytic activity, such as water cleaning, air purification, and solar cells . However, the high photocatalytic activity of TiO 2 pigments may cause chalking, discoloration, and breakage of paints and plastics when exposed to sunlight . In addition, when used as an ultraviolet absorber in sunscreen, the photogenerated free radicals of TiO 2 can also lead to the deterioration of organic ingredients and even cause skin problems .…”