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• W2078803911 startingPage "7845" @default.
• W2078803911 abstract "Molecular dynamics methods were used to simulate UO2(OH)20 binding to pairs of oxo sites (OS) on three low-index planes of α-SiO2 in contact with water. Differences in binding site distributions on the (001), (010) and (101) planes produced distinct sets of stable U inner-sphere species. Steric constraints prevented bidentate coordination to the (001) surface, resulting in a mononuclear monodentate complex, [UO2(OH)2(H2O)nOS] (90% for n = 1 and 10% for n = 2 over 5 ns production runs). Binuclear bidentate coordination, [UO2(OH)2(H2O)n(OS)2], was however favored on the (010) (99% for n = 0 and 1% for n = 1) and the (101) (72% for n = 0 and 28% for n = 1) planes. These results underscore a predominant four-coordinated equatorial shell for U when complexed to the quartz/water interface. Potential of mean force calculations uncovered a diversity of metastable outer- and inner-sphere complexes at local energy minima up to ∼0.4 nm from the surface. These calculations point to important differences in both energetic requirements and mechanisms for the approach of UO2(OH)20 to different quartz surfaces. Binding strengths are affected by binding site distribution, steric freedom, U hydration and OH orientation, and increase in the order (001) (3.7 kJ mol−1) < (101) (5.6 kJ mol−1) < (010) (6.5 kJ mol−1). A general binding mechanism involves (1) formation of monodentate outer-sphere complexes, (2) removal of oxo-bound waters, (3) formation of one (monodentate), then two (bidentate) direct U–OS bonds (inner-sphere), and (4) expulsion of excessive waters from the equatorial shell of U." @default.
• W2078803911 created "2016-06-24" @default.
• W2078803911 creator A5028158469 @default.
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• W2078803911 date "2011-01-01" @default.
• W2078803911 modified "2023-09-25" @default.
• W2078803911 title "Crystallographic controls on uranyl binding at the quartz/water interface" @default.
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• W2078803911 doi "https://doi.org/10.1039/c0cp01406k" @default.
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