TiO2 Applications as a Function of Controlled Surface Treatment

Abstract

For the end use, the structure and morphology of the coated film are very important since they determine the final properties of the resultant material. The effect of coatings largely depends on their composition and method of application, which may give porous or dense coatings. To achieve uniform coatings on dispersed TiO 2 particles, various compounds were deposited one after another under specific conditions by the wet chemical deposition method starting from rutile TiO 2 , produced by the sulfate method in Cinkarna Celje. With the synthesis of composite particles consisting of a core TiO 2 particle coated with a functional shell with dimensions in the nano scale, we prepared advanced materials, where the shell protects the particles from undesirable interactions with the environment and improves surface reactive properties of the dispersed particles to meet special requirements. The morphology of surface-treated TiO 2 particles has been identified directly using electron microscopy, while the degree of functionalization by various hydroxides was determined using X-ray fluorescence spectrometer (XRF). In addition, zeta potential (ZP) measurements have been utilized to determine the electrochemical properties of resultant particles. The precipitation of hydroxides on the TiO 2 surface resulted in the shift of the isoelectric point (IEP). UV-Vis spectroscopy has been used for determining light scattering efficiency. In addition to internal characterization, light fastness of durable grade intended for the application in laminates has been tested by the end user.

Synthesis of Uniform Size Rutile TiO2 Microrods by Simple Molten-Salt Method and Its Photoluminescence Activity

“…For efficient light scattering, the diameter of the particles should be slightly smaller than the half wavelength of incident light. For example, for visible light range from 380 to 750 nm, the particle size should be slightly less than or half of that range, which is about 200 to 300 nm and much higher than earlier examples [ 10 ]. Moreover, TiO 2 is an outstanding material with a high refractive index, which is the main reason for light scattering and one of the important parameters for white pigments.…”

In Vitro Studies on Nanoporous, Nanotubular and Nanosponge-Like Titania Coatings, with the Use of Adipose-Derived Stem Cells

“…Therefore, one of the key challenges in bone healing and regeneration is the engineering of an implant, which provides osteointegration with enhanced bioactivity and improves implant-host interactions to reduce biological related implant failure. The success of implants is strongly dependent on the fixation of the implant biomaterial to bone and firm bonding, for optimal function and lastingness [6][7][8][9][10][11].…”

Size-Specific, Dynamic, Probabilistic Material Flow Analysis of Titanium Dioxide Releases into the Environment

“…Except for TiO 2 pigment in the anatase form, used as a food additive, all other commercially available TiO 2 pigments are surface-treated using a variety of oxide and oxyhydrate coatings of aluminum and silicium. ,, In some applications, silicone or organic coatings may be applied as a second coating layer to change the surface from hydrophilic to hydrophobic . The weathering of the TiO 2 pigments used in paints and coatings may lead to pigment chalking, an effect that is more likely with anatase pigments .…”

“…TiO 2 is primarily used in paints and coatings, plastics, paper, printing inks, cosmetics, and food (as E171). Its added value lies in its outstanding light-scattering abilities and its resistance to weather, low toxicity, and chemical and biological inertness. , These properties are closely related to its primary particle size distribution, crystalline form, and surface treatment …”

“…Rutile pigments are more resistant to weathering and make products more opaque than anatase pigments do. , Less stable anatase pigments are chosen for products such as interior paints because they are cheaper . To enhance their dispersibility within a matrix and improve weather resistance, TiO 2 pigment surfaces are generally given inorganic and organic coatings …”