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Precipitation−Redispersion of Cerium Oxide Nanoparticles with Poly(acrylic acid): Toward Stable Dispersions
Open accessAbstract
We exploit a precipitation-redispersion mechanism for complexation of short chain polyelectrolytes with cerium oxide nanoparticles to extend their stability ranges. As synthesized, cerium oxide sols at pH 1.4 consist of monodisperse cationic nanocrystalline particles having a hydrodynamic diameter of 10 nm and a molecular weight of 400 000 g mol(-1). We show that short chain uncharged poly(acrylic acid) at low pH when added to a cerium oxide sols leads to macroscopic precipitation. As the pH is increased, the solution spontaneously redisperses into a clear solution of single particles with an anionic poly(acrylic acid) corona. The structure and dynamics of cerium oxide nanosols and their hybrid polymer-inorganic complexes in solution are investigated by static and dynamic light scattering, X-ray scattering, and chemical analysis. Quantitative analysis of the redispersed sol gives rise to an estimate of 40-50 polymer chains per particle for stable suspension. This amount represents 20% of the mass of the polymer-nanoparticle complexes. This complexation adds utility to the otherwise unstable cerium oxide dispersions by extending the range of stability of the sols in terms of pH, ionic strength, and concentration.
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Cites
Perez, J. M., O'Loughin, T., Simeone, F. J., Weissleder, R., & Josephson, L. (2002) · Journal of the American Chemical Society · doi:10.1021/ja017773n · Cited by 355
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Environmental behavior and ecotoxicity of engineered nanoparticles to algae, plants, and fungi
Navarro, E., Baun, A., Behra, R., Hartmann, N. B., Filser, J., Miao, A.-J., Quigg, A., Santschi, P. H., & Sigg, L. (2008) · Ecotoxicology · doi:10.1007/s10646-008-0214-0 · Cited by 1,772
Cerium Oxide Nanoparticles: A Brief Review of Their Synthesis Methods and Biomedical Applications
Dhall, A., & Self, W. (2018) · Antioxidants · doi:10.3390/antiox7080097 · Cited by 482
Colloidal Stabilization of Nanoparticles in Concentrated Suspensions
Studart, A. R., Amstad, E., & Gauckler, L. J. (2007) · Langmuir · doi:10.1021/la062042s · Cited by 261
Metadata
- Authors
- Sehgal, A., Lalatonne, Y., Berret, J.-F., & Morvan, M.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-09-01
- Volume
- 21
- Issue
- 20
- Pages
- 9359-9364
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W1990920124
- Cited by
- 210
- References
- 1
- FWCI
- 4.95
- Type
- journal article
- Language
- en
- Open access
- green
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