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

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

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 s...

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Veröffentlicht in:Langmuir 2020-05, Vol.36 (17), p.4820-4826
Hauptverfasser: Tian, Qiang, Zhang, Di, Li, Na, Henderson, Mark Julian, Li, Qintang, Royal, Guy, Courtois, Jérémie, Yan, Minhao, Zhu, Zhichao, Almásy, László
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container_end_page 4826
container_issue 17
container_start_page 4820
container_title Langmuir
container_volume 36
creator Tian, Qiang
Zhang, Di
Li, Na
Henderson, Mark Julian
Li, Qintang
Royal, Guy
Courtois, Jérémie
Yan, Minhao
Zhu, Zhichao
Almásy, László
description 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.
doi_str_mv 10.1021/acs.langmuir.9b03934
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title Structural Study of Polystyrene‑b‑poly(acrylic acid) Micelles Complexed with Uranyl: A SAXS Core–Shell Model Analysis
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