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

Kellermeier, Matthias; Glaab, Fabian; Carnerup, Anna LU ; Drechsler, Markus; Gossler, Benjamin; Hyde, Stephen T. and Kunz, Werner (2009) In Journal of Crystal Growth 311(8). p.2530-2541
Abstract
Crystallisation of barium carbonate from alkaline silica solutions results in the formation of extraordinary micron-scale architectures exhibiting non-crystallographic 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 great efforts have been devoted to clarifying the physical origin of these fascinating materials, to date little is known about the processes underlying the observed self-organisation. Herein, we describe the effect of two selected additives, a cationic surfactant and a cationic polymer, on the morphology of the forming crystal... (More)
Crystallisation of barium carbonate from alkaline silica solutions results in the formation of extraordinary micron-scale architectures exhibiting non-crystallographic 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 great efforts have been devoted to clarifying the physical origin of these fascinating materials, to date little is known about the processes underlying the observed self-organisation. Herein, we describe the effect of two selected additives, a cationic surfactant and a cationic polymer, on the morphology of the forming crystal aggregates, and relate changes to experiments conducted in the absence of additives. Minor amounts of both substances are shown to exert a significant influence on the growth process, leading to the formation of predominantly flower-like spherulitic aggregates. The observed effects are discussed in terms of feasible morphogenesis pathways. Based on the assumption of a template membrane steering biomorph formation, it is proposed that the two additives are capable of performing specific bridging functions promoting the aggregation of colloidal silica which constitutes the membrane. Morphological changes are tentatively ascribed to varying colloid coordination effecting distinct membrane curvatures. (C) 2009 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Barium carbonate, Growth from solutions, Biomimetic materials, Silica biomorphs, Cetyltrimethylammonium bromide (CTAB), Poly(diallyldimethylammonium, chloride) (pDADMAC)
in
Journal of Crystal Growth
volume
311
issue
8
pages
2530 - 2541
publisher
Elsevier
external identifiers
  • wos:000266351600052
  • scopus:65249176877
ISSN
0022-0248
DOI
10.1016/j.jcrysgro.2009.02.044
language
English
LU publication?
yes
id
89d753c6-70a2-4934-ae48-2e7d7fff05f4 (old id 1425010)
date added to LUP
2009-07-02 16:52:42
date last changed
2017-03-12 03:54:28
@article{89d753c6-70a2-4934-ae48-2e7d7fff05f4,
  abstract     = {Crystallisation of barium carbonate from alkaline silica solutions results in the formation of extraordinary micron-scale architectures exhibiting non-crystallographic 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 great efforts have been devoted to clarifying the physical origin of these fascinating materials, to date little is known about the processes underlying the observed self-organisation. Herein, we describe the effect of two selected additives, a cationic surfactant and a cationic polymer, on the morphology of the forming crystal aggregates, and relate changes to experiments conducted in the absence of additives. Minor amounts of both substances are shown to exert a significant influence on the growth process, leading to the formation of predominantly flower-like spherulitic aggregates. The observed effects are discussed in terms of feasible morphogenesis pathways. Based on the assumption of a template membrane steering biomorph formation, it is proposed that the two additives are capable of performing specific bridging functions promoting the aggregation of colloidal silica which constitutes the membrane. Morphological changes are tentatively ascribed to varying colloid coordination effecting distinct membrane curvatures. (C) 2009 Elsevier B.V. All rights reserved.},
  author       = {Kellermeier, Matthias and Glaab, Fabian and Carnerup, Anna and Drechsler, Markus and Gossler, Benjamin and Hyde, Stephen T. and Kunz, Werner},
  issn         = {0022-0248},
  keyword      = {Barium carbonate,Growth from solutions,Biomimetic materials,Silica biomorphs,Cetyltrimethylammonium bromide (CTAB),Poly(diallyldimethylammonium,chloride) (pDADMAC)},
  language     = {eng},
  number       = {8},
  pages        = {2530--2541},
  publisher    = {Elsevier},
  series       = {Journal of Crystal Growth},
  title        = {Additive-induced morphological tuning of self-assembled silica-barium carbonate crystal aggregates},
  url          = {http://dx.doi.org/10.1016/j.jcrysgro.2009.02.044},
  volume       = {311},
  year         = {2009},
}