Additive-induced morphological tuning of self-assembled silica-barium carbonate crystal aggregates
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1425010
- author
- Kellermeier, Matthias ; Glaab, Fabian ; Carnerup, Anna LU ; Drechsler, Markus ; Gossler, Benjamin ; Hyde, Stephen T. and Kunz, Werner
- organization
- publishing date
- 2009
- 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
- 2016-04-01 14:22:05
- date last changed
- 2022-02-04 20:31:11
@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}},
keywords = {{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}},
doi = {{10.1016/j.jcrysgro.2009.02.044}},
volume = {{311}},
year = {{2009}},
}