Aggregation stability of gold citrate hydrosol: Effect of ozone |
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Authors: | P A Morozov B G Ershov E V Abkhalimov O V Dement’eva T B Rumyantseva V M Rudoy V I Roldughin |
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Institution: | 1.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Optical spectroscopy, dynamic light scattering, electrophoresis, and transmission electron microscopy are used to study the
action of ozone on the stability of a gold hydrosol produced by the citrate method. It is shown that gold nanoparticles are
not oxidized, even upon long-term ozonation. At short times of ozonation, changes that occur in the state of the sol are reversible.
Nevertheless, even at this stage, organic ligands, which stabilize the hydrosol, are oxidized, while adsorbed ozone molecules
can play the role of a stabilizer. At long ozonation times, when the oxidation of organic substances present in the system
is actually completed, the colloidal solution loses its aggregation stability. |
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