TiO2纳米颗粒胶体活化系统设计及流场仿真分析

紫外光(UV)诱导纳米颗粒胶体射流加工可实现硬脆晶体材料亚纳米级超光滑表面的加工,根据其材料去除原理可知,伴随抛光过程的进行,胶体中TiO₂纳米颗粒表面会吸附一层工件表面的被去除原子,从而影响TiO₂纳米颗粒胶体的活性和光催化性.为了实现TiO₂纳米颗粒胶体的循环使用,基于O₃/UV高级氧化法对使用后的TiO₂纳米颗粒胶体再活化机理进行了研究,同时结合紫外光诱导纳米颗粒胶体射流加工系统设计了TiO₂纳米颗粒胶体活化系统,对系统内的再活化反应室结构进行了流体动力学仿真,仿真结果表明其结构设计满足TiO₂纳米颗粒胶体的活化要求.

Design of TiO2 nanoparticle colloid activation system and its flow field simulation analysis

Ultraviolet (UV)-induced nanoparticle colloidal jet processing can realize the processing of sub-nanometer ultra-smooth surface of hard and brittle crystal materials. It can be known according to the material removal principle that along with the polishing process, the surface of TiO₂ nanoparticles in the colloid would absorb a layer of removed atoms of the workpiece, so that the activity and photocatalytic properties of the TiO₂ nanoparticle colloid would be affected. In order to achieve the recycling of TiO₂ nanoparticle colloids, the O₃/UV advanced oxidation process(AOPs) was based to study the reactivation mechanism of the TiO₂ nanoparticles colloids and meantime, the TiO₂ nanoparticle colloidal activation system was designed as incorporated with the UV-induced nanoparticle colloidal jet processing system. Finally, the structure of reactivation reaction chamber in the system was fluid-dynamically simulated. The simulation result showed that the structural design would meet the activation requirements of TiO₂ nanoparticle colloid.