Abstract: Based on the principle of heterogeneous nucleation and micro-mixing in the impinging- streamrotating packed bed (IS–RPB) reactor, the liquid phase cladding and interfacial reaction was adopted to prepareγ–Al2O3/TiO2 nanopowder by using nanometric TiO2•nH2O particles as base material and AlCl3•6H2O solution as cladding phase. The dispersion and the liquid–solid mixing of nanoparticles in the high gravity field in the IS–RPB reactor were also discussed. According to the spectra of FTIR, TEM Zeta and XRD, it was inferred that the Ti–O–Al bond was formed at the interface of the coating layer and the surface of nanosized TiO2 particles. The thickness of Al2O3 membrane with sponge structure was about 5nm.

摘要： 基于异相表面成核和撞击流-旋转填料床反应器的微观混合原理，以纳米水合氧化钛(TiO2•nH2O)粒子为固相基体，六水氯化铝溶液为包覆相，采用液相包覆-界面反应的方法在纳米TiO2前体颗粒表面包覆了纳米Al2O3膜，并对超重力场中纳米粒子表面包覆过程进行了初步分析。通过IR、TEM、Zeta电位分析和XRD分析，证实了纳米TiO2前体颗粒表面包覆了一层厚约5 nm的致密海绵状膜。IR和XRD谱图表明，在Al2O3纳米膜层和纳米TiO2颗粒之间的界面上形成了Ti—O—Al键，包覆膜层的晶体结构以γ-Al2O3为主的混合晶型。