Slow Aggregation of Titania Nanocrystals in Acidic Hydrosols

摘要

The kinetics of slow aggregation of monodisperse TiO_2 nanocrystals in the acidic hydrosols at room temperature was studied for months by turbidimetry. The dependence of the initial rate of aggregation on the pH was calculated. The comparison of results obtained by turbidimetry and small angle X-ray scattering permits to suppose that very loose aggregates form at the low pH in HCI solution. The dependencies obtained in this work for room temperature can be taken into consideration at the tuning of TiO_2 nanoparticles morphology through thermal treatment of hydrosols.