Precipitation mechanism of amorphous silica nanoparticles: a simulation approach

Journal of Colloid and Interface Science
C NogueraA Clément

Abstract

Despite its importance in numerous industrial and natural processes, many unsolved questions remain regarding the mechanism of silica precipitation in aqueous solutions: order of the reaction, role of silica oligomers, existence of an induction time and characteristics of the particle population. This may be traced back, in past models, to the lack of account of the first stages of nucleation, size dependence of the growth law, and full particle population. COMPUTATIONAL METHOD: A microscopic description of the nucleation and growth of amorphous silica nanoparticles is achieved which reproduces a large set of experimental measurements, under various thermodynamic conditions. The time evolution of the solution supersaturation and of the precipitate characteristics is established. A growth law of order 6 allows reproducing experimental results, without being correlated to the presence of silica oligomers in the aqueous solution. The saturation plateaus are shown not to be due to an induction period. The characteristics of the particle population are more complex than assumed by simple precipitation models (Johnson-Mehl-Avrami-Kolmogorov or Chronomal models) and strongly depend on how supersaturation is reached. Such a microscopic...Continue Reading

References

Dec 13, 2007·The Journal of Physical Chemistry. B·S Caratzoulas, D G Vlachos

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Citations

May 24, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·M KleyK Huber
May 18, 2021·Asian Journal of Pharmaceutical Sciences·Athirah Bakhtiar, Ezharul Hoque Chowdhury

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