Spermine, spermidine and their analogues generate tailored silicas

D J Belton, S V Patwardhan, C C Perry

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82 Citations (Scopus)

Abstract

Biosilicifying organisms such as diatoms, sponges and higher plants deposit ornate "glassy" siliceous materials with well defined properties such as particle size and porosity at precisely controlled growth rates. Here we present the in vitro synthesis and characterisation of "glassy" silica with tailored properties by using naturally occurring amines - spermidine and spermine - and their analogues. These additives were found to regulate the growth rates, particle sizes, maturation, surface areas, porosities and morphologies of the siliceous materials prepared. In particular, the combination of unique catalytic effects and aggregation behaviours that are dependent on or related to chain length, intramolecular N-N spacing and C : N ratio of the additives was found to be responsible for controlling materials properties. Mechanisms regulating the generation of silicas showing a range of material characteristics are proposed.

Original languageEnglish
Pages (from-to)4629-4638
Number of pages10
JournalJournal of Materials Chemistry
Volume15
Issue number43
DOIs
Publication statusPublished - 21 Nov 2005

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Keywords

  • long-chain ppolyamines
  • acid polymerization
  • amino acids
  • neutral ph
  • biosilica
  • protonation
  • peptides
  • diatoms
  • lysine

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