Nanotubular bells: A simple route to a uranyl diphosphonate with an elliptical nanotubular structure has been developed (see picture; C black, O red, Cs blue, F yellow, UO7 green pentagonal bipyramids, phosphonate violet tetrahedra). The interior of the nanotubules provides a different chemical environment than the exterior with regards to the exchange of Cs+ cations for Ag+ cations, thus demonstrating that uranyl nanotubules are functional materials.
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Adelani et al. (2010) studied this question.
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