Structural Study of Polystyrene- b-poly(acrylic acid) Micelles Complexed with Uranyl: A SAXS Core-Shell Model Analysis

Qiang Tian, Di Zhang, Na Li, Mark Julian Henderson, Qintang Li, Guy Royal, Jérémie Courtois, Minhao Yan, Zhichao Zhu, László Almásy

Research output: Contribution to journalArticle

Abstract

The interactions between natural colloidal organic matter and actinides in solutions are complex and not fully understood. In this work, a crew-cut polystyrene-b-poly(acry1ic acid) (PS-b-PAA) micelle is proposed as a model particle for humic acid (HA) colloid with the aim to better understand the sequestration, aggregation, and mobility of HA colloids in the presence of uranyl ions. The effects of uranyl ions on the structure of PS29k-b-PAA5k micelles in aqueous solution were mainly investigated by synchrotron small-angle X-ray scattering. A core-shell model, accounting for the thickness and contrast changes of the PAA corona induced by the adsorption of uranyl, was employed to analyze the scattering data. A combination of transmission electron microscopy, dynamic light scattering, and zetametry showed a strong affinity of uranyl ions to PAA segments in water at pH 4-5 that resulted in the shrinkage and improved contrast of the PAA corona, as well as colloidal destabilization at a high uranyl concentration.

Original languageEnglish
Pages (from-to)4820-4826
Number of pages7
JournalLangmuir
Volume36
Issue number17
DOIs
Publication statusPublished - May 5 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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  • Cite this

    Tian, Q., Zhang, D., Li, N., Henderson, M. J., Li, Q., Royal, G., Courtois, J., Yan, M., Zhu, Z., & Almásy, L. (2020). Structural Study of Polystyrene- b-poly(acrylic acid) Micelles Complexed with Uranyl: A SAXS Core-Shell Model Analysis. Langmuir, 36(17), 4820-4826. https://doi.org/10.1021/acs.langmuir.9b03934