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Nanostructures in Uranium Oxocompounds

Published online by Cambridge University Press:  26 February 2011

Sergey V. Krivovichev
Affiliation:
skrivovi@mail.ru, St.Petersburg State University, Crystallography, University Emb. 7/9, St.Petersburg, N/A, 199034, Russian Federation, 7(812)3289647, 7(812)3284418
Ivan G. Tananaev
Affiliation:
geokhi@mail.ru, Instute of Physical Chemistry RAS, Russian Federation
Boris F Myasoedov
Affiliation:
bmyas@pran.ru, Institute of Physical Chemistry RAS, Russian Federation
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Abstract

Examples of uranium-oxide-based nanostructures are considered, including 2D organic-inorganic nanocomposites and nanotubules. In nanocomposites, interfacial interactions between organic and inorganic substructures can be studied by charge-density matching principle. Application of this principle to uranyl compounds requires special attention since surface area of uranyl-based 2D units is higher than that of other inorganic oxysalts units (i.e. metal phosphates). The charge-density matching principle is, however, observed either through tail interdigitation (for long-chain monoamines) or incorporation of acid-water interlayers into organic substructure (for long-chain diamines). In some compounds, protonated amine molecules form cylindrical micelles that involves self-assembly governed by competing hydrophobic/hydrophillic interactions. The flexible inorganic complexes present in the reaction mixture could then form around cylindrical micelles to produce highly undulated 2D sheets or nanotubules.

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