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Dependence of amine-accelerated silicate condensation on amine structure

Journal of Materials Chemistry, ISSN: 1364-5501, Vol: 17, Issue: 20, Page: 2113-2119
2007
  • 32
    Citations
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    Usage
  • 21
    Captures
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Metrics Details

  • Citations
    32
    • Citation Indexes
      32
  • Captures
    21

Article Description

Diatoms are known to grow elaborate nano- and microstructured silica shells by depositing material from precursor-containing vesicles at mild temperature and pH. Oligo(1-methylazetane) and related moieties, in some cases attached to proteins, are believed to facilitate this process. To complement prior studies of more complex amines, we aim to understand why such a unique structure has evolved through a systematic study of a set of simple model compounds. The degree to which a series of diamines in solution enhances condensation of phosphate-buffered silicic acid at neutral pH increases with increasing alkylation, a factor more important than amine pKa. This suggests why diatoms often use methylated oligomers. Bis(quaternary ammonium) salts result in even greater reactivity enhancement, constituting a new class of compounds that promote condensation under mild conditions. Methods are presented for incorporation of these new moieties into artificial peptides or other template-forming molecules, which should allow for more effective production of tailored silica nanostructures. © The Royal Society of Chemistry.

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