Abstract
In this work, the salt-induced aggregation of bare and polymer-covered silver particles has been studied with the aid of light scattering and UV-visible spectroscopy. Light scattering on a suspension of bare silver particles at a low salt concentration shows that the cluster fractal dimension d f changes from 1.6 to 2 in the course of the aggregation process, whereas no restructuring of the clusters is observed at a higher salinity where d f ≈ 1.6. The growth of the clusters over time can be described by a power law R h ∝ t α, where R h is the apparent hydrodynamic radius. The UV-visible experiments revealed that increasing the size of the bare silver particles lead to a significant broadening and red-shift of the absorbance band, whereas for salt-induced growth of Ag clusters, a blue-shift and broadening was observed. Addition of salt to a suspension of silver particles and hydroxyethylcellulose divulged a slower broadening of the surface plasmon peak than without polymer.
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Acknowledgment
This work was financially supported from the Research Council of Norway within the FRINAT program, project number 177556/V30.
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Trinh, L.T.T., Kjøniksen, AL., Zhu, K. et al. Slow salt-induced aggregation of citrate-covered silver particles in aqueous solutions of cellulose derivatives. Colloid Polym Sci 287, 1391–1404 (2009). https://doi.org/10.1007/s00396-009-2100-6
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DOI: https://doi.org/10.1007/s00396-009-2100-6