Hydrogen bonding and phase separation cooperatively guide the self-assembly of U60 and the polymer to fabricate multiscale nanostructures

Abstract

U₆₀ (L_i44K₁₆[UO₂(O₂)(OH)]₆₀, U₆₀) and polymers are directionally enriched on the polymer surface by hydrogen bonding. In this study, we used several different polymers and U₆₀ for self-assembly. The morphology and non-covalent interaction between core–shell nanocomplexes were studied by electron microscopy and vibration spectroscopy. Under the synergistic action of hydrogen bonding and nanometer phase separation, block copolymers and U₆₀ formed different structures of core–shell nanocomposites. At a low concentration of U₆₀, spherical nanocomposites with frozen structures were formed, at a high concentration of U₆₀, stable worm-like structures, and micelles were formed. We used block copolymers to absorb U₆₀, and after one month, about 96% of U₆₀ could be removed from the solution. Because of uranium toxicity and long half-life, storage and transportation are important for the environment and public health. This study may open the door for further development of novel and efficient polymer self-assembly materials to adsorb and remove nuclear pollution in the environment.