Polyamidoxime chain length drives emergent metal-binding phenomena
| Autor: | Changwoo Do, Carter W. Abney, Lyndsey D. Earl, Yangyang Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Extended X-ray absorption fine structure Dispersity General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Polymer Uranium 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Small-angle neutron scattering 0104 chemical sciences X-ray absorption fine structure chemistry.chemical_compound Monomer chemistry Dynamic light scattering Chemical physics Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Physical Chemistry Chemical Physics. 21:554-560 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Emergence is complex behavior arising from the interactions of many simple constituents that do not display such behavior independently. Polyamidoxime (PAO) uranium adsorbents show such phenomena, as recent works articulate that the polymer binds uranium differently than the monomeric constituents. In order to investigate the origins of this emergent uranium-binding behavior, we synthesized a series of amidoxime polymers with low polydispersity and small molecules with lengths ranging from 1 to 125 repeat units. Following immersion in a uranyl-containing solution, the local, intermediate, and macroscopic structures were investigated by X-ray absorption fine structure (XAFS) spectroscopy, small angle neutron scattering (SANS), and dynamic light scattering (DLS). Fits of the extended XAFS (EXAFS) region revealed a progressive change in uranium coordination environment as a function of polymer molecular weight, identifying chain length as a driving force in emergent metal binding and resolving the controversy over how amidoxime adsorbents bind uranium. |
| Databáze: | OpenAIRE |
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