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Slow aggregation and disaggregation of TiO2 nanocrystals in aqueous HCl solutions |
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| Authors: | O B Pavlova-Verevkina L A Ozerina A Chemseddine A N Ozerin |
| Institution: | 1. Karpov Institute of Physical Chemistry, Obuha side street 3-1/12, building 6, Moscow, 105064, Russia 2. Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109, Berlin, Germany 3. Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Profsoyuznaya St. 70, Moscow, 117393, Russia |
| Abstract: | The kinetics of slow aggregation and disaggregation of the plate-shaped TiO2 nanocrystals in aqueous HCl solutions at room temperature was studied using turbidimetry and small-angle X-ray scattering. The rate of slow aggregation of the diluted TiO2 hydrosols with 0.3 ≤ pH ≤ 3 was compared. The sols with pH about 1 were the most stable and the aggregation rate increased at the decrease of pH from 1 to 0.3 and at the increase of pH from 1 to 3. The reversible loose aggregates slowly formed at the low pH, while the more stable aggregates grew at higher pH. |
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