Comparison of particle size and standard deviation of TiO2 particles prepared by batch, semi-batch and continuous reaction method

A new preparation method for TiO2 nanoparticles was introduced, which consisted of a small reactor for controlling the hydrolysis rate and continuous aging tube for reducing the size and standard deviation of TiO2 particles. In this process, TiO2 nanoparticles were synthesized from the hydrolysis and condensation of TEOT without HPC dispersant. The particles prepared by using a continuous reaction method without dispersant had a smaller mean particle size and a smaller standard deviation than those obtained from batch or semi-batch processes using dispersant. In this work, it was also found that the size of TiO2 particles decreased by applying intermittent flow to the aging tube. By using the above conditions, mean diameters as small as 30 nm were obtained.