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Additive-induced morphological tuning of self-assembled silica-barium carbonate crystal aggregates

Kellermeier, Matthias ; Glaab, Fabian ; Carnerup, Anna M. ; Drechsler, Markus ; Gossler, Benjamin ; Hyde, Stephen T. ; Kunz, Werner


Crystn. of barium carbonate from alk. silica solns. results in the formation of extraordinary micron-scale architectures exhibiting non-crystallog. curved shapes, such as helical filaments and worm-like braids. These so-called "silica biomorphs" consist of a textured assembly of uniform elongated witherite nanocrystallites, which is occasionally sheathed by a skin of amorphous silica. Although ...


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