Surface-Modified TiO₂@SiO₂ Nanocomposites for Enhanced Dispersibility and Optical Performance to Apply in the Printing Process as a Pigment

Abstract

The grafted modification TiO 2 @SiO 2 composite was fabricated by a liquidphase deposition method with Na 2 SiO 3 and a grafting reaction with a silane coupling agent. First, the TiO 2 @SiO 2 composite was prepared, and the effect of deposition rate and silica content on the morphology, particle size, dispersibility, and pigmentary property of TiO 2 @SiO 2 composites was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and ζ-potential. The islandlike TiO 2 @SiO 2 composite had a good particle size and printing performance compared with the dense TiO 2 @SiO 2 composite. The presence of Si was confirmed by EDX elemental analysis and XPS, and a peak at 980 cm −1 belonging to Si−O was observed in the FTIR spectrum, confirming the presence of SiO 2 anchored at TiO 2 surfaces via Si−O−Ti bonds. Then, the islandlike TiO 2 @SiO 2 composite was modified by grafting with a silane coupling agent. The effect of the silane coupling agent on the hydrophobicity and dispersibility was investigated. The peaks at 2919 and 2846 cm −1 belong to CH 2 in the FTIR spectrum, and Si−C in the XPS confirmed the grafting of silane coupling agent to the TiO 2 @SiO 2 composite. The grafted modification of the islandlike TiO 2 @SiO 2 composite using 3-triethoxysilylpropylamine endowed it with weather durability, dispersibility, and good printing performance.

Functionalized Thiophosphate and Oxidic Filler Particles for Hybrid Solid Electrolytes

“…For the functionalized LATP particles a shift in the symmetric stretching vibration of PÀ O bonds at 800 to 1200 cm À 1 from 927 cm À 1 to 980 cm À 1 is visible which is likely attributed to a new peak at 980 cm À 1 assigned to a SiÀ O bond additionally confirming the successful grafting of LATP particles with CTMS. [33] A chemical bond in between the CTMS and PEO or PEG is likely as shown by Pan et al, but could not be detected as just a small amount of PEO reacts with the silane and a small shift in the SiÀ C peak could not be resolved for the FTIR analysis of the HSE (Figure S4, Supporting Information). [23] However, the polarity and hence compatibility of the LATP particles with the polymer is changed.…”

Liposome encapsulated hemoglobin modified Au@TiO2 for sonodynamic therapy

“…Gao et al reported the synergistic photothermal/SDT of titania-coated Au nanoplates in cancer treatment [20]. Despite these achievements in the combination of noble metals and TiO 2 NPs for SDT, factors such as agglomeration [21][22][23][24] or adsorb protein [25,26], and hypoxia in tumor site [27] can alter the physicochemical properties of Au@TiO 2 and hindering their therapeutic effects. Therefore, constructing delivery systems with oxygencarrying abilities, good dispersion and high ROS production of Au@TiO 2 in a biological environment is still a challenge in SDT field.…”