Russian Mineralogical Society
2nd International Conference "Crystallogenesis and Mineralogy"
Microscopic model of crystallogenesis from aqueous solutions of uranyl selenate

RMS-DPI code:  2007-1-172-0
Scientific session:  Session 6. Nanophases and nanoprocesses
Author listing:  Krivovichev S.V., Gurzhiy V.V., Tananaev I.G., Myasoedov B.F.
Principal author:  Krivovichev Sergey
Language:  Russian
Abstract - Summary 
(short description):
On the basis of experimental studies of crystallization products from aqueous solutions of uranyl selenate, a model of microscopic crystallogenesis has been suggested that is based upon the following principles. 1. Prenucleation structural building units in uranyl selenate solutions are cyclic tetramers or 4-membered rings of U and Se coordination polyhedra. 2. Crystallogenesis from the uranyl selenate aqueous solutions is a many-step process that involves formation of intermediate metastable structures based upon cyclic tetramers. Transition between different structures is solution-mediated and involves a dissolution-reprecipitation mechanism. Structural evolution is towards complexes of increasing dimensionality. 3. In organically templated systems, crystallogenesis involves self-assembly of organic and inorganic substructures. For short-chain and branched diamines, a principle of hydrophillic and hydrophobic zones plays an important role, whereas, for long-chain amines, formation of cylindrical or 2-D block micelles is observed. The model suggested can be used for investigations of nanoscale self-assembly processes in uranium-based systems in order to create nanostructured uranium oxysalt materials.
 
RMS-DPI code:  2007-1-172-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  392-393
File of proceedings 
(PDF): 
 249 K
Status:  printed
Accepted:  22/08/2007
Published on-line:  05/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-172-0/
Contact author(s):  Krivovichev, Sergey

Copyright © Russian Mineralogical Society, 1995-2011. All rights reserved.
http://www.minsoc.ru
printed on 17/09/2021