Characteristics of organic titanate modified titanium dioxide nanoparticles and its dispersibility in acrylic emulsion coating

Abstract

This work presents the characteristics of rutile TiO2 nanoparticles modified by isopropyl tri[di(octyl) phosphato] titanate (KR‐12) with the content of 3, 5 and 10 wt.% as compared to TiO2 nanoparticles weight. The infrared (IR) spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), and thermal gravimetry analysis (TGA) methods were used to evaluate the surface modification efficiency of the TiO2 nanoparticles with KR‐12. The TGA and IR analysis results indicated that the organic coupling agent (KR‐12) was grafted to the surface of the nanoparticles. The TiO2 nanoparticles after modification could disperse stably in water easily. The modification caused the shift of surface charge of the TiO2 nanoparticles to more positive region. The average particle size of TiO2 nanoparticles modified with 0, 3, 5, and 10 wt.% of KR‐12 was 443.9 nm, 295.3 nm, 334.8 nm, and 392.3 nm, respectively. The hydrophobic ability of TiO2 nanoparticles was improved significantly after modification. The modified TiO2 nanoparticles could well disperse in acrylic emulsion coating with dispersed phase size of 200‐400 nm.

Chitosan-Mediated Coupling of MgFe2O4–TiO2 Nanocomposites for Efficient Methylene Blue Photodegradation

“…As can be seen, an increase in the calcination temperature from 300 to 800 °C significantly decreases the bandgap energy of the material from 2.91 to 1.78 eV, which can be ascribed to the gradual generation of the rutile phase during the calcination process. It has been reported that the bandgap energy of pristine TiO 2 is approximately 3 eV based on diverse synthesis procedures, , which is higher than those of all MFO-TiO 2 samples. This phenomenon can be assigned to the participation of the ferrite nanostructure with low band gap energy as well as the support of the polymer matrix of chitosan, which is responsible for the good crystallinity and stability of the MFO-TiO 2 , thanks to the strong interaction with long-chain carbohydrate.…”