Silica biomorphs : complex biomimetic hybrid materials from "Sand and Chalk"

Kellermeier, Matthias; Cölfen, Helmut; García-Ruiz, Juan Manuel

Silica biomorphs : complex biomimetic hybrid materials from "Sand and Chalk"

Dateien

Kellermeier_226245.pdfGröße: 4.69 MBDownloads: 36

Datum

2012

Autor:innen

Kellermeier, Matthias

Cölfen, Helmut

García-Ruiz, Juan Manuel

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

European Journal of Inorganic Chemistry. 2012, 2012(32), pp. 5123-5144. ISSN 1434-1948. eISSN 1099-0682. Available under: doi: 10.1002/ejic.201201029

Zusammenfassung

Biomineralization can afford crystal frameworks of great diversity and utmost complexity, frequently featuring hierarchical structures and morphologies beyond any crystallographic restrictions. The formation of such architectures is usually directed by organic molecules or matrices, which modify crystallization in a deliberate manner. Their influence often leads to sinuous forms, which, by intuition, suggest the presence of life and distinguish these minerals from their inanimate, mostly euhedral counterparts. However, such a strict distinction does not hold. In fact, smooth curvature and higher-order structuring can occur also in purely inorganic environments: simply by precipitating alkaline earth carbonates in silica-containing media, aggregates of highly oriented carbonate nanocrystals can be obtained that display striking noncrystallographic morphologies such as regular helicoids. Thereby, individual crystallites as well as the entire assembly are sheathed by amorphous silica, thus giving a composite material with various levels of hierarchy. These exceptional forms, called "silica biomorphs", self-assemble through a bottom-up process, which relies on local variations in the conditions and is driven by a pH-based coupling of the carbonate and silicate. Here, we review recent progress in the field of silica biomorphs with particular focus on their mechanism of formation, provide insight into structural details at different length scales, and discuss implications of these biomimetic crystal aggregates for both primitive life detection and materials science.

Fachgebiet (DDC)

540 Chemie

Schlagwörter

Biomorphs, nanostructures, self-assembly, materials science, biomineralization

Zitieren

ISO 690

KELLERMEIER, Matthias, Helmut CÖLFEN, Juan Manuel GARCÍA-RUIZ, 2012. Silica biomorphs : complex biomimetic hybrid materials from "Sand and Chalk". In: European Journal of Inorganic Chemistry. 2012, 2012(32), pp. 5123-5144. ISSN 1434-1948. eISSN 1099-0682. Available under: doi: 10.1002/ejic.201201029

BibTex

@article{Kellermeier2012Silic-22624,
  year={2012},
  doi={10.1002/ejic.201201029},
  title={Silica biomorphs : complex biomimetic hybrid materials from "Sand and Chalk"},
  number={32},
  volume={2012},
  issn={1434-1948},
  journal={European Journal of Inorganic Chemistry},
  pages={5123--5144},
  author={Kellermeier, Matthias and Cölfen, Helmut and García-Ruiz, Juan Manuel}
}

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    <dcterms:abstract xml:lang="eng">Biomineralization can afford crystal frameworks of great diversity and utmost complexity, frequently featuring hierarchical structures and morphologies beyond any crystallographic restrictions. The formation of such architectures is usually directed by organic molecules or matrices, which modify crystallization in a deliberate manner. Their influence often leads to sinuous forms, which, by intuition, suggest the presence of life and distinguish these minerals from their inanimate, mostly euhedral counterparts. However, such a strict distinction does not hold. In fact, smooth curvature and higher-order structuring can occur also in purely inorganic environments: simply by precipitating alkaline earth carbonates in silica-containing media, aggregates of highly oriented carbonate nanocrystals can be obtained that display striking noncrystallographic morphologies such as regular helicoids. Thereby, individual crystallites as well as the entire assembly are sheathed by amorphous silica, thus giving a composite material with various levels of hierarchy. These exceptional forms, called "silica biomorphs", self-assemble through a bottom-up process, which relies on local variations in the conditions and is driven by a pH-based coupling of the carbonate and silicate. Here, we review recent progress in the field of silica biomorphs with particular focus on their mechanism of formation, provide insight into structural details at different length scales, and discuss implications of these biomimetic crystal aggregates for both primitive life detection and materials science.</dcterms:abstract>
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