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High Resolution Image Download MS PowerPoint Slide The grafted modification TiO 2 @SiO 2 composite was fabricated by a liquid-phase 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.
Wang et al. (Fri,) studied this question.