Counteranion-directed, biomimetic control of silica nanostructures on surfaces inspired by biosilicification found in diatoms

Sung Ho Yang, Ji Hun Park, Woo Kyung Cho, Hee Seung Lee, Insung S. Choi

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The nanometer-scale control of the structures of silica films achieved in biomimetic silicification processes by simple counteranion exchange of q-PDMAEMA was demonstrated. A uniform PDMAEMA film was generated on gold, and the PDMAEMA film was subsequently quaternized with bromo-ethane. Biomimetic silicification was performed on each substrate at room temperature and was confirmed by Fourier-transform infrared (FT-IR) spectroscopy. The tightly associated polymeric films would be more impermeable to silicic-acid derivatives, which results in the formation of smaller silica nanoparticulates. The counteranions were found to significantly affect the morphogenesis of silica nanoparticulates on surfaces by interacting with and shaping q-PDMAEMA films differently based on their charge density. The biomimetic approach would be one possible method for controlling inorganic structures on surfaces under mild conditions at the nanometer scale.

Original languageEnglish
Pages (from-to)1947-1951
Number of pages5
JournalSmall
Volume5
Issue number17
DOIs
StatePublished - 4 Sep 2009

Keywords

  • Biomimicry
  • Biosilicification
  • Counteranions
  • Nanoparticles
  • Silica

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