关键词:

纳米TiO₂, 软团聚体, 解团聚, 锚固改性

Abstract:

Nanoparticles，such as TiO₂，are readily aggregated in aqueous medium，which always drastically deteriorates their performance.In this study，the agglomeration state of TiO₂ particles in aqueous dispersion and the effects of several conventional dispersion technologies and surface grafting modification technology on the de-aggregation of TiO₂ agglomeration were investigated.It was found that most of TiO₂ particles in aqueous media existed as soft agglomeration.The de-aggregation effects of high-speed shear dispersion and dispersing agent on the soft agglomeration were not obvious，and the ultrasonic dispersion could only have a temporary de-aggregation effect.While the surface of TiO₂ particles was grafting modified by polymer molecule via in-situ polymerization，an extensive de-aggregation effect with good efficiency and stability could be achieved.Thus the dispersion and the dispersion stability of TiO₂ particle in aqueous media as well as in the fabric surface could be significantly improved.

Key words:

纳米TiO₂, 软团聚体, 解团聚, 锚固改性